91 yj driving me crazy
04-06-2004, 05:44 PM
#21
Guest
Posts: n/a
Re: 91 yj driving me crazy
(CPS) Crankshaft Position Sensor, which counts
the flywheel teeth and is mounted on the bell housing......
Just my thoughts, as mentioned in a previous post.
Paul in VA
"mike" <mcapsu@yahoo.com> wrote in message
news:fed0233a.0404052134.6838cdcf@posting.google.c om...
> I am going nuts with this problem,
>
> my 91 yj has not started in about six months now!
>
> I changed the oil around october and parked it for a week, then went
> to start it up and it cranked and cranked, but didnt start.
>
> Now the list starts...
>
> fuel filter? changed it no help
>
> fuel pump? got a fuel pressure gauge and the fuel rail has pressure
> within spec (36-40 psi)
>
> spark? put a timing light on it, i have spark on all 4 plugs
>
> not enough spark?
> changed plugs, wires, cap, rotor, coil
>
> injectors not opening?
> bought a set of noid lights and they blink like a christmas tree like
> they are supposed to, and the plugs are wet, pulled injectors and
> replaced o-rings and cleaned as best i could by hand, I couldnt find a
> place that would test them to see if they were stuck open
>
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
>
> electrical?
> checked ground strap from block to firewall for continuity - very low
> to no resistance, same with negative post of battery to block or
> chassis
> fuses - all look good, under hood and under dash
>
> bad gas?
> siphoned out tank and refilled, cranked a bunch with the release of
> the fuel pressure gauge open to get the gas in the lines 'clean'
>
> i am stumped, i guess im back to electrical, i just pulled all of the
> underdash fuses except the ignition fuse, it cranks and sounds like
> maybe one cylinder is fireing(same as with them all in), my next todos
> are to get a code reader and see if i get anything on that, then also
> check the ground to the coil, then maybe replace the computer...
>
> does anyone know where the computer is located on a '91 yj 2.5l?
> can they test that out of the vehicle?
>
> i cant seem to find a timing setting on it, is it supposed to fire
> advanced at all? or is that controlled by the computer?
>
> also all the dash gauges/idiot lights are now not coming on (yes with
> the fuses in, no check engine light earlier in the disaster which is
> why i didnt hook up an OBD reader earlier)
>
> compression? (i would have thought id get more warning on this? it is
> a 2.5l turning 31s so it was never peppy)
>
> any other ideas?
>
> sorry if this post sounds a bit angry but im just frustrated, thanks
> for any help in advance
>
> Thanks,
> Mike
>
> 96xj (luckily this one is hauling me around trustilly)
> 91yj (lets pull it out of its early grave!)
> 97 ducati monster 900 (new toy :-) )
the flywheel teeth and is mounted on the bell housing......
Just my thoughts, as mentioned in a previous post.
Paul in VA
"mike" <mcapsu@yahoo.com> wrote in message
news:fed0233a.0404052134.6838cdcf@posting.google.c om...
> I am going nuts with this problem,
>
> my 91 yj has not started in about six months now!
>
> I changed the oil around october and parked it for a week, then went
> to start it up and it cranked and cranked, but didnt start.
>
> Now the list starts...
>
> fuel filter? changed it no help
>
> fuel pump? got a fuel pressure gauge and the fuel rail has pressure
> within spec (36-40 psi)
>
> spark? put a timing light on it, i have spark on all 4 plugs
>
> not enough spark?
> changed plugs, wires, cap, rotor, coil
>
> injectors not opening?
> bought a set of noid lights and they blink like a christmas tree like
> they are supposed to, and the plugs are wet, pulled injectors and
> replaced o-rings and cleaned as best i could by hand, I couldnt find a
> place that would test them to see if they were stuck open
>
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
>
> electrical?
> checked ground strap from block to firewall for continuity - very low
> to no resistance, same with negative post of battery to block or
> chassis
> fuses - all look good, under hood and under dash
>
> bad gas?
> siphoned out tank and refilled, cranked a bunch with the release of
> the fuel pressure gauge open to get the gas in the lines 'clean'
>
> i am stumped, i guess im back to electrical, i just pulled all of the
> underdash fuses except the ignition fuse, it cranks and sounds like
> maybe one cylinder is fireing(same as with them all in), my next todos
> are to get a code reader and see if i get anything on that, then also
> check the ground to the coil, then maybe replace the computer...
>
> does anyone know where the computer is located on a '91 yj 2.5l?
> can they test that out of the vehicle?
>
> i cant seem to find a timing setting on it, is it supposed to fire
> advanced at all? or is that controlled by the computer?
>
> also all the dash gauges/idiot lights are now not coming on (yes with
> the fuses in, no check engine light earlier in the disaster which is
> why i didnt hook up an OBD reader earlier)
>
> compression? (i would have thought id get more warning on this? it is
> a 2.5l turning 31s so it was never peppy)
>
> any other ideas?
>
> sorry if this post sounds a bit angry but im just frustrated, thanks
> for any help in advance
>
> Thanks,
> Mike
>
> 96xj (luckily this one is hauling me around trustilly)
> 91yj (lets pull it out of its early grave!)
> 97 ducati monster 900 (new toy :-) )
04-06-2004, 05:47 PM
#22
Guest
Posts: n/a
Re: 91 yj driving me crazy
With my Brother's four Cherokees and four CPS, there was no spark.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
04-06-2004, 05:47 PM
#23
Guest
Posts: n/a
Re: 91 yj driving me crazy
With my Brother's four Cherokees and four CPS, there was no spark.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
04-06-2004, 05:47 PM
#24
Guest
Posts: n/a
Re: 91 yj driving me crazy
With my Brother's four Cherokees and four CPS, there was no spark.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
04-06-2004, 05:47 PM
#25
Guest
Posts: n/a
Re: 91 yj driving me crazy
With my Brother's four Cherokees and four CPS, there was no spark.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"IsellJeeps!" wrote:
>
> crank sensor??
04-06-2004, 06:06 PM
#26
Guest
Posts: n/a
Re: 91 yj driving me crazy
mike did pass the time by typing:
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
04-06-2004, 06:06 PM
#27
Guest
Posts: n/a
Re: 91 yj driving me crazy
mike did pass the time by typing:
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
04-06-2004, 06:06 PM
#28
Guest
Posts: n/a
Re: 91 yj driving me crazy
mike did pass the time by typing:
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
04-06-2004, 06:06 PM
#29
Guest
Posts: n/a
Re: 91 yj driving me crazy
mike did pass the time by typing:
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
You have fuel and spark, with those the engine has to start
or at least make noise unless the timing is way off.
I think 8 degreed before TDC is where your timing should be.
Sure the distributor is indexed properly and the plug wires are
going to the correct cylinders?
--
DougW
04-06-2004, 06:59 PM
#30
Guest
Posts: n/a
Re: 91 yj driving me crazy
look at this articles...
http://www.asashop.org/autoinc/april2001/techtotech.cfm
http://www.asashop.org/autoinc/feb99/techtotech.htm
mcapsu@yahoo.com (mike) wrote in message news:<fed0233a.0404052134.6838cdcf@posting.google. com>...
> I am going nuts with this problem,
>
> my 91 yj has not started in about six months now!
>
> I changed the oil around october and parked it for a week, then went
> to start it up and it cranked and cranked, but didnt start.
>
> Now the list starts...
>
> fuel filter? changed it no help
>
> fuel pump? got a fuel pressure gauge and the fuel rail has pressure
> within spec (36-40 psi)
>
> spark? put a timing light on it, i have spark on all 4 plugs
>
> not enough spark?
> changed plugs, wires, cap, rotor, coil
>
> injectors not opening?
> bought a set of noid lights and they blink like a christmas tree like
> they are supposed to, and the plugs are wet, pulled injectors and
> replaced o-rings and cleaned as best i could by hand, I couldnt find a
> place that would test them to see if they were stuck open
>
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
>
> electrical?
> checked ground strap from block to firewall for continuity - very low
> to no resistance, same with negative post of battery to block or
> chassis
> fuses - all look good, under hood and under dash
>
> bad gas?
> siphoned out tank and refilled, cranked a bunch with the release of
> the fuel pressure gauge open to get the gas in the lines 'clean'
>
> i am stumped, i guess im back to electrical, i just pulled all of the
> underdash fuses except the ignition fuse, it cranks and sounds like
> maybe one cylinder is fireing(same as with them all in), my next todos
> are to get a code reader and see if i get anything on that, then also
> check the ground to the coil, then maybe replace the computer...
>
> does anyone know where the computer is located on a '91 yj 2.5l?
> can they test that out of the vehicle?
>
> i cant seem to find a timing setting on it, is it supposed to fire
> advanced at all? or is that controlled by the computer?
>
> also all the dash gauges/idiot lights are now not coming on (yes with
> the fuses in, no check engine light earlier in the disaster which is
> why i didnt hook up an OBD reader earlier)
>
> compression? (i would have thought id get more warning on this? it is
> a 2.5l turning 31s so it was never peppy)
>
> any other ideas?
>
> sorry if this post sounds a bit angry but im just frustrated, thanks
> for any help in advance
>
> Thanks,
> Mike
>
> 96xj (luckily this one is hauling me around trustilly)
> 91yj (lets pull it out of its early grave!)
> 97 ducati monster 900 (new toy :-) )
http://www.asashop.org/autoinc/april2001/techtotech.cfm
http://www.asashop.org/autoinc/feb99/techtotech.htm
mcapsu@yahoo.com (mike) wrote in message news:<fed0233a.0404052134.6838cdcf@posting.google. com>...
> I am going nuts with this problem,
>
> my 91 yj has not started in about six months now!
>
> I changed the oil around october and parked it for a week, then went
> to start it up and it cranked and cranked, but didnt start.
>
> Now the list starts...
>
> fuel filter? changed it no help
>
> fuel pump? got a fuel pressure gauge and the fuel rail has pressure
> within spec (36-40 psi)
>
> spark? put a timing light on it, i have spark on all 4 plugs
>
> not enough spark?
> changed plugs, wires, cap, rotor, coil
>
> injectors not opening?
> bought a set of noid lights and they blink like a christmas tree like
> they are supposed to, and the plugs are wet, pulled injectors and
> replaced o-rings and cleaned as best i could by hand, I couldnt find a
> place that would test them to see if they were stuck open
>
> out of time?
> put the light on it and cranked it over... looked to be 4 degrees
> retarded... changed timing chain(which was a bit slack when i took the
> cover off), sprockets and tensioner and noticed the water pump was
> leaking, changed that too, now its fireing at 0
>
> electrical?
> checked ground strap from block to firewall for continuity - very low
> to no resistance, same with negative post of battery to block or
> chassis
> fuses - all look good, under hood and under dash
>
> bad gas?
> siphoned out tank and refilled, cranked a bunch with the release of
> the fuel pressure gauge open to get the gas in the lines 'clean'
>
> i am stumped, i guess im back to electrical, i just pulled all of the
> underdash fuses except the ignition fuse, it cranks and sounds like
> maybe one cylinder is fireing(same as with them all in), my next todos
> are to get a code reader and see if i get anything on that, then also
> check the ground to the coil, then maybe replace the computer...
>
> does anyone know where the computer is located on a '91 yj 2.5l?
> can they test that out of the vehicle?
>
> i cant seem to find a timing setting on it, is it supposed to fire
> advanced at all? or is that controlled by the computer?
>
> also all the dash gauges/idiot lights are now not coming on (yes with
> the fuses in, no check engine light earlier in the disaster which is
> why i didnt hook up an OBD reader earlier)
>
> compression? (i would have thought id get more warning on this? it is
> a 2.5l turning 31s so it was never peppy)
>
> any other ideas?
>
> sorry if this post sounds a bit angry but im just frustrated, thanks
> for any help in advance
>
> Thanks,
> Mike
>
> 96xj (luckily this one is hauling me around trustilly)
> 91yj (lets pull it out of its early grave!)
> 97 ducati monster 900 (new toy :-) )