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rough running 93 zj 4.0l atx
HELP me please.
story: bought a 1993 jeep grand cherokee with 173k on it. i have persisting problems. not sure if these are related? symptoms: hard starting, excessive cranking rough idle, intermittent stall P to D or R rough running attempting to pass on highway my mistakes: 173k replaced fuel pressure regulator and fuel pump (ouch) replaced spark plugs because some nut put bosch quadfires in it. immediately improved the hard starting problems. 183k replaced intake gasket for suspected vacuum leak. no improvement. replaced spark plug wires. no improvement. replaced IAC, no improvement. replaced crank position sensor connector, after which i promptly broke the sensor, and replaced that too. no improvement. tested and found to be ok: tps, map, ect, iat, alternator, vacuum, coil. ready to load the .45 i'm losing my mind here. not sure if i should shoot myself, or the truck. -- Ben Jerew AKA PolarPuppy1976 New Country Lexus of Latham, NY, USA Amateur Off-Roader 93 YJ, 93 ZJ |
Re: rough running 93 zj 4.0l atx
On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76
<\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > HELP me please. > > story: bought a 1993 jeep grand cherokee with 173k > on it. i have persisting problems. not sure if > these are related? > > symptoms: > hard starting, excessive cranking > rough idle, intermittent stall P to D or R > rough running attempting to pass on highway > > my mistakes: > 173k replaced fuel pressure regulator and fuel > pump (ouch) replaced spark plugs because some nut > put bosch quadfires in it. immediately improved > the hard starting problems. > > 183k replaced intake gasket for suspected vacuum > leak. no improvement. replaced spark plug wires. > no improvement. replaced IAC, no improvement. > replaced crank position sensor connector, after > which i promptly broke the sensor, and replaced > that too. no improvement. > > tested and found to be ok: > tps, map, ect, iat, alternator, vacuum, coil. > > ready to load the .45 i'm losing my mind here. not > sure if i should shoot myself, or the truck. Did you also replace the cap and rotor when you changed the plugs and wires? -- Will Honea |
Re: rough running 93 zj 4.0l atx
On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76
<\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > HELP me please. > > story: bought a 1993 jeep grand cherokee with 173k > on it. i have persisting problems. not sure if > these are related? > > symptoms: > hard starting, excessive cranking > rough idle, intermittent stall P to D or R > rough running attempting to pass on highway > > my mistakes: > 173k replaced fuel pressure regulator and fuel > pump (ouch) replaced spark plugs because some nut > put bosch quadfires in it. immediately improved > the hard starting problems. > > 183k replaced intake gasket for suspected vacuum > leak. no improvement. replaced spark plug wires. > no improvement. replaced IAC, no improvement. > replaced crank position sensor connector, after > which i promptly broke the sensor, and replaced > that too. no improvement. > > tested and found to be ok: > tps, map, ect, iat, alternator, vacuum, coil. > > ready to load the .45 i'm losing my mind here. not > sure if i should shoot myself, or the truck. Did you also replace the cap and rotor when you changed the plugs and wires? -- Will Honea |
Re: rough running 93 zj 4.0l atx
On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76
<\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > HELP me please. > > story: bought a 1993 jeep grand cherokee with 173k > on it. i have persisting problems. not sure if > these are related? > > symptoms: > hard starting, excessive cranking > rough idle, intermittent stall P to D or R > rough running attempting to pass on highway > > my mistakes: > 173k replaced fuel pressure regulator and fuel > pump (ouch) replaced spark plugs because some nut > put bosch quadfires in it. immediately improved > the hard starting problems. > > 183k replaced intake gasket for suspected vacuum > leak. no improvement. replaced spark plug wires. > no improvement. replaced IAC, no improvement. > replaced crank position sensor connector, after > which i promptly broke the sensor, and replaced > that too. no improvement. > > tested and found to be ok: > tps, map, ect, iat, alternator, vacuum, coil. > > ready to load the .45 i'm losing my mind here. not > sure if i should shoot myself, or the truck. Did you also replace the cap and rotor when you changed the plugs and wires? -- Will Honea |
Re: rough running 93 zj 4.0l atx
On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76
<\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > HELP me please. > > story: bought a 1993 jeep grand cherokee with 173k > on it. i have persisting problems. not sure if > these are related? > > symptoms: > hard starting, excessive cranking > rough idle, intermittent stall P to D or R > rough running attempting to pass on highway > > my mistakes: > 173k replaced fuel pressure regulator and fuel > pump (ouch) replaced spark plugs because some nut > put bosch quadfires in it. immediately improved > the hard starting problems. > > 183k replaced intake gasket for suspected vacuum > leak. no improvement. replaced spark plug wires. > no improvement. replaced IAC, no improvement. > replaced crank position sensor connector, after > which i promptly broke the sensor, and replaced > that too. no improvement. > > tested and found to be ok: > tps, map, ect, iat, alternator, vacuum, coil. > > ready to load the .45 i'm losing my mind here. not > sure if i should shoot myself, or the truck. Did you also replace the cap and rotor when you changed the plugs and wires? -- Will Honea |
Re: rough running 93 zj 4.0l atx
Will Honea wrote:
> On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76 > <\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > > >>HELP me please. >> >>story: bought a 1993 jeep grand cherokee with 173k >>on it. i have persisting problems. not sure if >>these are related? >> >>symptoms: >>hard starting, excessive cranking >>rough idle, intermittent stall P to D or R >>rough running attempting to pass on highway >> >>my mistakes: >>173k replaced fuel pressure regulator and fuel >>pump (ouch) replaced spark plugs because some nut >>put bosch quadfires in it. immediately improved >>the hard starting problems. >> >>183k replaced intake gasket for suspected vacuum >>leak. no improvement. replaced spark plug wires. >>no improvement. replaced IAC, no improvement. >>replaced crank position sensor connector, after >>which i promptly broke the sensor, and replaced >>that too. no improvement. >> >>tested and found to be ok: >>tps, map, ect, iat, alternator, vacuum, coil. >> >>ready to load the .45 i'm losing my mind here. not >>sure if i should shoot myself, or the truck. > > > Did you also replace the cap and rotor when you changed the plugs and > wires? > the cap and rotor i did not replace because it was new just before i bought it. inside the cap is still clean with no deposits or carbon tracking. -- Ben Jerew AKA PolarPuppy1976 New Country Lexus of Latham, NY, USA Amateur Off-Roader 93 YJ, 93 ZJ |
Re: rough running 93 zj 4.0l atx
Will Honea wrote:
> On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76 > <\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > > >>HELP me please. >> >>story: bought a 1993 jeep grand cherokee with 173k >>on it. i have persisting problems. not sure if >>these are related? >> >>symptoms: >>hard starting, excessive cranking >>rough idle, intermittent stall P to D or R >>rough running attempting to pass on highway >> >>my mistakes: >>173k replaced fuel pressure regulator and fuel >>pump (ouch) replaced spark plugs because some nut >>put bosch quadfires in it. immediately improved >>the hard starting problems. >> >>183k replaced intake gasket for suspected vacuum >>leak. no improvement. replaced spark plug wires. >>no improvement. replaced IAC, no improvement. >>replaced crank position sensor connector, after >>which i promptly broke the sensor, and replaced >>that too. no improvement. >> >>tested and found to be ok: >>tps, map, ect, iat, alternator, vacuum, coil. >> >>ready to load the .45 i'm losing my mind here. not >>sure if i should shoot myself, or the truck. > > > Did you also replace the cap and rotor when you changed the plugs and > wires? > the cap and rotor i did not replace because it was new just before i bought it. inside the cap is still clean with no deposits or carbon tracking. -- Ben Jerew AKA PolarPuppy1976 New Country Lexus of Latham, NY, USA Amateur Off-Roader 93 YJ, 93 ZJ |
Re: rough running 93 zj 4.0l atx
Will Honea wrote:
> On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76 > <\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > > >>HELP me please. >> >>story: bought a 1993 jeep grand cherokee with 173k >>on it. i have persisting problems. not sure if >>these are related? >> >>symptoms: >>hard starting, excessive cranking >>rough idle, intermittent stall P to D or R >>rough running attempting to pass on highway >> >>my mistakes: >>173k replaced fuel pressure regulator and fuel >>pump (ouch) replaced spark plugs because some nut >>put bosch quadfires in it. immediately improved >>the hard starting problems. >> >>183k replaced intake gasket for suspected vacuum >>leak. no improvement. replaced spark plug wires. >>no improvement. replaced IAC, no improvement. >>replaced crank position sensor connector, after >>which i promptly broke the sensor, and replaced >>that too. no improvement. >> >>tested and found to be ok: >>tps, map, ect, iat, alternator, vacuum, coil. >> >>ready to load the .45 i'm losing my mind here. not >>sure if i should shoot myself, or the truck. > > > Did you also replace the cap and rotor when you changed the plugs and > wires? > the cap and rotor i did not replace because it was new just before i bought it. inside the cap is still clean with no deposits or carbon tracking. -- Ben Jerew AKA PolarPuppy1976 New Country Lexus of Latham, NY, USA Amateur Off-Roader 93 YJ, 93 ZJ |
Re: rough running 93 zj 4.0l atx
Will Honea wrote:
> On Sat, 27 Aug 2005 21:15:53 UTC "MudPuppy76 > <\"<moc.rr.pacyn\"@\"pupralop\">" <--SDRAWKCAB> wrote: > > >>HELP me please. >> >>story: bought a 1993 jeep grand cherokee with 173k >>on it. i have persisting problems. not sure if >>these are related? >> >>symptoms: >>hard starting, excessive cranking >>rough idle, intermittent stall P to D or R >>rough running attempting to pass on highway >> >>my mistakes: >>173k replaced fuel pressure regulator and fuel >>pump (ouch) replaced spark plugs because some nut >>put bosch quadfires in it. immediately improved >>the hard starting problems. >> >>183k replaced intake gasket for suspected vacuum >>leak. no improvement. replaced spark plug wires. >>no improvement. replaced IAC, no improvement. >>replaced crank position sensor connector, after >>which i promptly broke the sensor, and replaced >>that too. no improvement. >> >>tested and found to be ok: >>tps, map, ect, iat, alternator, vacuum, coil. >> >>ready to load the .45 i'm losing my mind here. not >>sure if i should shoot myself, or the truck. > > > Did you also replace the cap and rotor when you changed the plugs and > wires? > the cap and rotor i did not replace because it was new just before i bought it. inside the cap is still clean with no deposits or carbon tracking. -- Ben Jerew AKA PolarPuppy1976 New Country Lexus of Latham, NY, USA Amateur Off-Roader 93 YJ, 93 ZJ |
NT: diagnosing with kV measurements (was: rough running 93 zj 4.0latx)
MudPuppy76 <"<moc.rr.pacyn"@"pupralop"> wrote:
> HELP me please. > > story: bought a 1993 jeep grand cherokee with 173k on it. i have > persisting problems. not sure if these are related? > > symptoms: > hard starting, excessive cranking > rough idle, intermittent stall P to D or R > rough running attempting to pass on highway > > my mistakes: > 173k replaced fuel pressure regulator and fuel pump (ouch) replaced > spark plugs because some nut put bosch quadfires in it. immediately > improved the hard starting problems. > > 183k replaced intake gasket for suspected vacuum leak. no improvement. > replaced spark plug wires. no improvement. replaced IAC, no improvement. > replaced crank position sensor connector, after which i promptly broke > the sensor, and replaced that too. no improvement. > > tested and found to be ok: > tps, map, ect, iat, alternator, vacuum, coil. > > ready to load the .45 i'm losing my mind here. not sure if i should > shoot myself, or the truck. i remembered my kV probe and thought to myself, why not, but then i remembered i don't use it all that much, because all lexus now is DIS. anyways, i measured the kV on my cherokee. my results: coil: 10.6 1-6: 9.6, 8.5, 10.3, 11.3, 12.5, 10.6 this morning i decided to go back to my original fix 10k mi ago. i replaced the spark plugs. now it starts good again. i remeasured the kV: coil: 8.6 1-6: 6.5, 7.4, 9.1, 10.2, 9.2, 8.5 what would cause the plugs to foul out so fast? or is this normal? previously has champions in it. now i have ngk's. -- Ben Jerew AKA PolarPuppy1976 New Country Lexus of Latham, NY, USA Amateur Off-Roader 93 YJ, 93 ZJ |
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