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Re: New Cam, Jeep will only run without TPS
First thing that came to my mind is that you may have the distributor
indexed incorrectly. With cyl. 1 at TDC, the trailing edge of the ign. rotor should be about .020" PAST the #1 post in the distributor cap. With the TPS disconnected, the PCM may not be advancing the timing and that may be enough for it to 'fire' the correct post. In other words, the rotor isn't pointing in the right direction when the PCM fires the coil. On 28 Oct 2006 12:31:01 -0700, "jeepinacreek" <jeepinacreek@hotmail.com> wrote: >I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >was a great mod with out totaly stroking the motor. After completing >the buildup and starting it for the first time, I thought great it >runs. Then I ran up and it starting backfiring at around 1800+ RPM. >This has been my battle for the last three months. > >A little about my Jeep; >Doug thorley header >bored out 62mm throttle >MSD ignition >New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >Curry Enterpise lift 33in tires, 4:10 gears, lockers > >What I have done to fix this so far; >-Took it the dealer, they wouldn't touch it. >-I currently have timing chain retarded -5 degree's due to pinging, cut >down on backfiring. >-I also had it advanced +5 degree's, caused a lot more backfiring. >-I also ran the cam at TDC with no advance or timing. This is the >original way I built it. >-Changed TPS >-Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >ignition which I disconnected and the Jeep barely ran. Connected it >back up and seems to be the only thing keeping it running. So I know >the MSD works -changed O2 sensors -changed fuel pump and filters in >tank, gas cap to. >-Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >an air/fuel ratio gauge on it. > >So my latest attempt to get this thing running right truely has me >scratching my head, I left the TPS wire connected disconnected, drove >it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >hesitate or ping or miss or run rich. It runs great, I can drive it on >the freeway now. > >I am on my last leg with this thing. Anyone have any ideas or >suggestions?????? Please help or i may put the stock cam back in. |
Re: New Cam, Jeep will only run without TPS
First thing that came to my mind is that you may have the distributor
indexed incorrectly. With cyl. 1 at TDC, the trailing edge of the ign. rotor should be about .020" PAST the #1 post in the distributor cap. With the TPS disconnected, the PCM may not be advancing the timing and that may be enough for it to 'fire' the correct post. In other words, the rotor isn't pointing in the right direction when the PCM fires the coil. On 28 Oct 2006 12:31:01 -0700, "jeepinacreek" <jeepinacreek@hotmail.com> wrote: >I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >was a great mod with out totaly stroking the motor. After completing >the buildup and starting it for the first time, I thought great it >runs. Then I ran up and it starting backfiring at around 1800+ RPM. >This has been my battle for the last three months. > >A little about my Jeep; >Doug thorley header >bored out 62mm throttle >MSD ignition >New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >Curry Enterpise lift 33in tires, 4:10 gears, lockers > >What I have done to fix this so far; >-Took it the dealer, they wouldn't touch it. >-I currently have timing chain retarded -5 degree's due to pinging, cut >down on backfiring. >-I also had it advanced +5 degree's, caused a lot more backfiring. >-I also ran the cam at TDC with no advance or timing. This is the >original way I built it. >-Changed TPS >-Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >ignition which I disconnected and the Jeep barely ran. Connected it >back up and seems to be the only thing keeping it running. So I know >the MSD works -changed O2 sensors -changed fuel pump and filters in >tank, gas cap to. >-Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >an air/fuel ratio gauge on it. > >So my latest attempt to get this thing running right truely has me >scratching my head, I left the TPS wire connected disconnected, drove >it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >hesitate or ping or miss or run rich. It runs great, I can drive it on >the freeway now. > >I am on my last leg with this thing. Anyone have any ideas or >suggestions?????? Please help or i may put the stock cam back in. |
Re: New Cam, Jeep will only run without TPS
First thing that came to my mind is that you may have the distributor
indexed incorrectly. With cyl. 1 at TDC, the trailing edge of the ign. rotor should be about .020" PAST the #1 post in the distributor cap. With the TPS disconnected, the PCM may not be advancing the timing and that may be enough for it to 'fire' the correct post. In other words, the rotor isn't pointing in the right direction when the PCM fires the coil. On 28 Oct 2006 12:31:01 -0700, "jeepinacreek" <jeepinacreek@hotmail.com> wrote: >I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >was a great mod with out totaly stroking the motor. After completing >the buildup and starting it for the first time, I thought great it >runs. Then I ran up and it starting backfiring at around 1800+ RPM. >This has been my battle for the last three months. > >A little about my Jeep; >Doug thorley header >bored out 62mm throttle >MSD ignition >New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >Curry Enterpise lift 33in tires, 4:10 gears, lockers > >What I have done to fix this so far; >-Took it the dealer, they wouldn't touch it. >-I currently have timing chain retarded -5 degree's due to pinging, cut >down on backfiring. >-I also had it advanced +5 degree's, caused a lot more backfiring. >-I also ran the cam at TDC with no advance or timing. This is the >original way I built it. >-Changed TPS >-Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >ignition which I disconnected and the Jeep barely ran. Connected it >back up and seems to be the only thing keeping it running. So I know >the MSD works -changed O2 sensors -changed fuel pump and filters in >tank, gas cap to. >-Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >an air/fuel ratio gauge on it. > >So my latest attempt to get this thing running right truely has me >scratching my head, I left the TPS wire connected disconnected, drove >it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >hesitate or ping or miss or run rich. It runs great, I can drive it on >the freeway now. > >I am on my last leg with this thing. Anyone have any ideas or >suggestions?????? Please help or i may put the stock cam back in. |
Re: New Cam, Jeep will only run without TPS
TPS and CPS must be the keyboard again, he he,
Coasty "Earle Horton" <elangloburgues@usa.com> wrote in message news:4543accd$0$12070$88260bb3@free.teranews.com.. . > TPS = "Throttle Position Sensor" > > Still, ¿wtf? > > Earle > > "L.W.(Bill) ------ III" <----------@cox.net> wrote in message > news:4543B73A.482281E8@cox.net... >> I am a total loss as to how it would run without the Crankshaft >> Position Sensor. It should default into the safe mode, with no spark >> advance. Maybe you have your distributor installed in such a way so that >> it's Cam Position Sensor somehow takes over??????? What's the timing >> light show, initial and total? >> God Bless America, Bill O|||||||O >> mailto:-------------------- http://www.----------.com/ >> >> jeepinacreek wrote: >> > >> > I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >> > was a great mod with out totaly stroking the motor. After completing >> > the buildup and starting it for the first time, I thought great it >> > runs. Then I ran up and it starting backfiring at around 1800+ RPM. >> > This has been my battle for the last three months. >> > >> > A little about my Jeep; >> > Doug thorley header >> > bored out 62mm throttle >> > MSD ignition >> > New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >> > Curry Enterpise lift 33in tires, 4:10 gears, lockers >> > >> > What I have done to fix this so far; >> > -Took it the dealer, they wouldn't touch it. >> > -I currently have timing chain retarded -5 degree's due to pinging, cut >> > down on backfiring. >> > -I also had it advanced +5 degree's, caused a lot more backfiring. >> > -I also ran the cam at TDC with no advance or timing. This is the >> > original way I built it. >> > -Changed TPS >> > -Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >> > ignition which I disconnected and the Jeep barely ran. Connected it >> > back up and seems to be the only thing keeping it running. So I know >> > the MSD works -changed O2 sensors -changed fuel pump and filters in >> > tank, gas cap to. >> > -Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >> > an air/fuel ratio gauge on it. >> > >> > So my latest attempt to get this thing running right truely has me >> > scratching my head, I left the TPS wire connected disconnected, drove >> > it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >> > hesitate or ping or miss or run rich. It runs great, I can drive it on >> > the freeway now. >> > >> > I am on my last leg with this thing. Anyone have any ideas or >> > suggestions?????? Please help or i may put the stock cam back in. > > > > -- > Posted via a free Usenet account from http://www.teranews.com > |
Re: New Cam, Jeep will only run without TPS
TPS and CPS must be the keyboard again, he he,
Coasty "Earle Horton" <elangloburgues@usa.com> wrote in message news:4543accd$0$12070$88260bb3@free.teranews.com.. . > TPS = "Throttle Position Sensor" > > Still, ¿wtf? > > Earle > > "L.W.(Bill) ------ III" <----------@cox.net> wrote in message > news:4543B73A.482281E8@cox.net... >> I am a total loss as to how it would run without the Crankshaft >> Position Sensor. It should default into the safe mode, with no spark >> advance. Maybe you have your distributor installed in such a way so that >> it's Cam Position Sensor somehow takes over??????? What's the timing >> light show, initial and total? >> God Bless America, Bill O|||||||O >> mailto:-------------------- http://www.----------.com/ >> >> jeepinacreek wrote: >> > >> > I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >> > was a great mod with out totaly stroking the motor. After completing >> > the buildup and starting it for the first time, I thought great it >> > runs. Then I ran up and it starting backfiring at around 1800+ RPM. >> > This has been my battle for the last three months. >> > >> > A little about my Jeep; >> > Doug thorley header >> > bored out 62mm throttle >> > MSD ignition >> > New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >> > Curry Enterpise lift 33in tires, 4:10 gears, lockers >> > >> > What I have done to fix this so far; >> > -Took it the dealer, they wouldn't touch it. >> > -I currently have timing chain retarded -5 degree's due to pinging, cut >> > down on backfiring. >> > -I also had it advanced +5 degree's, caused a lot more backfiring. >> > -I also ran the cam at TDC with no advance or timing. This is the >> > original way I built it. >> > -Changed TPS >> > -Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >> > ignition which I disconnected and the Jeep barely ran. Connected it >> > back up and seems to be the only thing keeping it running. So I know >> > the MSD works -changed O2 sensors -changed fuel pump and filters in >> > tank, gas cap to. >> > -Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >> > an air/fuel ratio gauge on it. >> > >> > So my latest attempt to get this thing running right truely has me >> > scratching my head, I left the TPS wire connected disconnected, drove >> > it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >> > hesitate or ping or miss or run rich. It runs great, I can drive it on >> > the freeway now. >> > >> > I am on my last leg with this thing. Anyone have any ideas or >> > suggestions?????? Please help or i may put the stock cam back in. > > > > -- > Posted via a free Usenet account from http://www.teranews.com > |
Re: New Cam, Jeep will only run without TPS
TPS and CPS must be the keyboard again, he he,
Coasty "Earle Horton" <elangloburgues@usa.com> wrote in message news:4543accd$0$12070$88260bb3@free.teranews.com.. . > TPS = "Throttle Position Sensor" > > Still, ¿wtf? > > Earle > > "L.W.(Bill) ------ III" <----------@cox.net> wrote in message > news:4543B73A.482281E8@cox.net... >> I am a total loss as to how it would run without the Crankshaft >> Position Sensor. It should default into the safe mode, with no spark >> advance. Maybe you have your distributor installed in such a way so that >> it's Cam Position Sensor somehow takes over??????? What's the timing >> light show, initial and total? >> God Bless America, Bill O|||||||O >> mailto:-------------------- http://www.----------.com/ >> >> jeepinacreek wrote: >> > >> > I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >> > was a great mod with out totaly stroking the motor. After completing >> > the buildup and starting it for the first time, I thought great it >> > runs. Then I ran up and it starting backfiring at around 1800+ RPM. >> > This has been my battle for the last three months. >> > >> > A little about my Jeep; >> > Doug thorley header >> > bored out 62mm throttle >> > MSD ignition >> > New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >> > Curry Enterpise lift 33in tires, 4:10 gears, lockers >> > >> > What I have done to fix this so far; >> > -Took it the dealer, they wouldn't touch it. >> > -I currently have timing chain retarded -5 degree's due to pinging, cut >> > down on backfiring. >> > -I also had it advanced +5 degree's, caused a lot more backfiring. >> > -I also ran the cam at TDC with no advance or timing. This is the >> > original way I built it. >> > -Changed TPS >> > -Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >> > ignition which I disconnected and the Jeep barely ran. Connected it >> > back up and seems to be the only thing keeping it running. So I know >> > the MSD works -changed O2 sensors -changed fuel pump and filters in >> > tank, gas cap to. >> > -Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >> > an air/fuel ratio gauge on it. >> > >> > So my latest attempt to get this thing running right truely has me >> > scratching my head, I left the TPS wire connected disconnected, drove >> > it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >> > hesitate or ping or miss or run rich. It runs great, I can drive it on >> > the freeway now. >> > >> > I am on my last leg with this thing. Anyone have any ideas or >> > suggestions?????? Please help or i may put the stock cam back in. > > > > -- > Posted via a free Usenet account from http://www.teranews.com > |
Re: New Cam, Jeep will only run without TPS
That's a good point, could you have put the wires on the distributor cap
one position off? I've done that and the engine will run, but sounds off and backfires when revved. Jeff DeWitt bllsht wrote: > First thing that came to my mind is that you may have the distributor > indexed incorrectly. > > With cyl. 1 at TDC, the trailing edge of the ign. rotor should be > about .020" PAST the #1 post in the distributor cap. > > With the TPS disconnected, the PCM may not be advancing the timing and > that may be enough for it to 'fire' the correct post. > > In other words, the rotor isn't pointing in the right direction when > the PCM fires the coil. > > > > On 28 Oct 2006 12:31:01 -0700, "jeepinacreek" > <jeepinacreek@hotmail.com> wrote: > > >>I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >>was a great mod with out totaly stroking the motor. After completing >>the buildup and starting it for the first time, I thought great it >>runs. Then I ran up and it starting backfiring at around 1800+ RPM. >>This has been my battle for the last three months. >> >>A little about my Jeep; >>Doug thorley header >>bored out 62mm throttle >>MSD ignition >>New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >>Curry Enterpise lift 33in tires, 4:10 gears, lockers >> >>What I have done to fix this so far; >>-Took it the dealer, they wouldn't touch it. >>-I currently have timing chain retarded -5 degree's due to pinging, cut >>down on backfiring. >>-I also had it advanced +5 degree's, caused a lot more backfiring. >>-I also ran the cam at TDC with no advance or timing. This is the >>original way I built it. >>-Changed TPS >>-Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >>ignition which I disconnected and the Jeep barely ran. Connected it >>back up and seems to be the only thing keeping it running. So I know >>the MSD works -changed O2 sensors -changed fuel pump and filters in >>tank, gas cap to. >>-Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >>an air/fuel ratio gauge on it. >> >>So my latest attempt to get this thing running right truely has me >>scratching my head, I left the TPS wire connected disconnected, drove >>it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >>hesitate or ping or miss or run rich. It runs great, I can drive it on >>the freeway now. >> >>I am on my last leg with this thing. Anyone have any ideas or >>suggestions?????? Please help or i may put the stock cam back in. |
Re: New Cam, Jeep will only run without TPS
That's a good point, could you have put the wires on the distributor cap
one position off? I've done that and the engine will run, but sounds off and backfires when revved. Jeff DeWitt bllsht wrote: > First thing that came to my mind is that you may have the distributor > indexed incorrectly. > > With cyl. 1 at TDC, the trailing edge of the ign. rotor should be > about .020" PAST the #1 post in the distributor cap. > > With the TPS disconnected, the PCM may not be advancing the timing and > that may be enough for it to 'fire' the correct post. > > In other words, the rotor isn't pointing in the right direction when > the PCM fires the coil. > > > > On 28 Oct 2006 12:31:01 -0700, "jeepinacreek" > <jeepinacreek@hotmail.com> wrote: > > >>I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >>was a great mod with out totaly stroking the motor. After completing >>the buildup and starting it for the first time, I thought great it >>runs. Then I ran up and it starting backfiring at around 1800+ RPM. >>This has been my battle for the last three months. >> >>A little about my Jeep; >>Doug thorley header >>bored out 62mm throttle >>MSD ignition >>New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >>Curry Enterpise lift 33in tires, 4:10 gears, lockers >> >>What I have done to fix this so far; >>-Took it the dealer, they wouldn't touch it. >>-I currently have timing chain retarded -5 degree's due to pinging, cut >>down on backfiring. >>-I also had it advanced +5 degree's, caused a lot more backfiring. >>-I also ran the cam at TDC with no advance or timing. This is the >>original way I built it. >>-Changed TPS >>-Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >>ignition which I disconnected and the Jeep barely ran. Connected it >>back up and seems to be the only thing keeping it running. So I know >>the MSD works -changed O2 sensors -changed fuel pump and filters in >>tank, gas cap to. >>-Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >>an air/fuel ratio gauge on it. >> >>So my latest attempt to get this thing running right truely has me >>scratching my head, I left the TPS wire connected disconnected, drove >>it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >>hesitate or ping or miss or run rich. It runs great, I can drive it on >>the freeway now. >> >>I am on my last leg with this thing. Anyone have any ideas or >>suggestions?????? Please help or i may put the stock cam back in. |
Re: New Cam, Jeep will only run without TPS
That's a good point, could you have put the wires on the distributor cap
one position off? I've done that and the engine will run, but sounds off and backfires when revved. Jeff DeWitt bllsht wrote: > First thing that came to my mind is that you may have the distributor > indexed incorrectly. > > With cyl. 1 at TDC, the trailing edge of the ign. rotor should be > about .020" PAST the #1 post in the distributor cap. > > With the TPS disconnected, the PCM may not be advancing the timing and > that may be enough for it to 'fire' the correct post. > > In other words, the rotor isn't pointing in the right direction when > the PCM fires the coil. > > > > On 28 Oct 2006 12:31:01 -0700, "jeepinacreek" > <jeepinacreek@hotmail.com> wrote: > > >>I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it >>was a great mod with out totaly stroking the motor. After completing >>the buildup and starting it for the first time, I thought great it >>runs. Then I ran up and it starting backfiring at around 1800+ RPM. >>This has been my battle for the last three months. >> >>A little about my Jeep; >>Doug thorley header >>bored out 62mm throttle >>MSD ignition >>New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in >>Curry Enterpise lift 33in tires, 4:10 gears, lockers >> >>What I have done to fix this so far; >>-Took it the dealer, they wouldn't touch it. >>-I currently have timing chain retarded -5 degree's due to pinging, cut >>down on backfiring. >>-I also had it advanced +5 degree's, caused a lot more backfiring. >>-I also ran the cam at TDC with no advance or timing. This is the >>original way I built it. >>-Changed TPS >>-Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD >>ignition which I disconnected and the Jeep barely ran. Connected it >>back up and seems to be the only thing keeping it running. So I know >>the MSD works -changed O2 sensors -changed fuel pump and filters in >>tank, gas cap to. >>-Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put >>an air/fuel ratio gauge on it. >> >>So my latest attempt to get this thing running right truely has me >>scratching my head, I left the TPS wire connected disconnected, drove >>it and it runs fine. No backfire at 1800+ RPM, it doesn't surge, >>hesitate or ping or miss or run rich. It runs great, I can drive it on >>the freeway now. >> >>I am on my last leg with this thing. Anyone have any ideas or >>suggestions?????? Please help or i may put the stock cam back in. |
Re: New Cam, Jeep will only run without TPS
I wish.
God Bless America, Bill O|||||||O mailto:-------------------- http://www.----------.com/ Coasty wrote: > > TPS and CPS must be the keyboard again, he he, > Coasty |
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