R72K5
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CK5
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- Thread starter R72K5
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big83chevy4x4
3/4 ton status
Re: 94 grand am 3.1L stopped firing the injectors
have you checked the crank sensor? the ecm need to know if the motor is turning over to fire the injectors
have you checked the crank sensor? the ecm need to know if the motor is turning over to fire the injectors
R72K5
Banned
Re: 94 grand am 3.1L stopped firing the injectors
[ QUOTE ]
have you checked the crank sensor? the ecm need to know if the motor is turning over to fire the injectors
[/ QUOTE ]
i thought all the crank sensor is tied to is the spark timing ?
then what is the cam sensor for ? just an electrical ornament/decoration ?
hmmm
thanks /forums/images/graemlins/laugh.gif
[ QUOTE ]
have you checked the crank sensor? the ecm need to know if the motor is turning over to fire the injectors
[/ QUOTE ]
i thought all the crank sensor is tied to is the spark timing ?
then what is the cam sensor for ? just an electrical ornament/decoration ?
hmmm
thanks /forums/images/graemlins/laugh.gif
big83chevy4x4
3/4 ton status
Re: 94 grand am 3.1L stopped firing the injectors
i think the cam sensor is for the spark timing. it could be the other way around though.
is the pump running while cranking? /forums/images/graemlins/dunno.gif
i think the cam sensor is for the spark timing. it could be the other way around though.
is the pump running while cranking? /forums/images/graemlins/dunno.gif
R72K5
Banned
Re: 94 grand am 3.1L stopped firing the injectors
i always read and been told that crank sensor is for spark timing, i dunno.
pump is brand new we just put it in and it ran great and it is pumping and is pressure in the intake fuel rail and everything
the car ran fine after new pump until it went on errand to walmart and it died in the parking lot and hasnt ran since,. it ran perfect like always before that not a lick of trouble at all, the original AC delco pump died and we put in the new one all before this non-firing injector problem happened, like in the last few days this all happened
the old fuel filter it was so old that you cant blow any air through it in either direction, at all, completely blocked.
its no wonder why the original pump died
even the spark wires and plugs were original GM equipment
its crazy
thanks
i always read and been told that crank sensor is for spark timing, i dunno.
pump is brand new we just put it in and it ran great and it is pumping and is pressure in the intake fuel rail and everything
the car ran fine after new pump until it went on errand to walmart and it died in the parking lot and hasnt ran since,. it ran perfect like always before that not a lick of trouble at all, the original AC delco pump died and we put in the new one all before this non-firing injector problem happened, like in the last few days this all happened
the old fuel filter it was so old that you cant blow any air through it in either direction, at all, completely blocked.
its no wonder why the original pump died
even the spark wires and plugs were original GM equipment
its crazy
thanks
Re: 94 grand am 3.1L stopped firing the injectors
As I recall, the 3.1 has a separate fuse for the injectors. I used to unplug that fuse on my 3.1L Beretta GT when I was leaving it at the airport parking lot for long periods. /forums/images/graemlins/cool.gif
As I recall, the 3.1 has a separate fuse for the injectors. I used to unplug that fuse on my 3.1L Beretta GT when I was leaving it at the airport parking lot for long periods. /forums/images/graemlins/cool.gif
R72K5
Banned
Re: 94 grand am 3.1L stopped firing the injectors
fuses are all perfect, jsut checked every single one of them,
wire is reading ground with key all the way back into the off position , but when you turn on the ignition switch forward to on position and also hold the key in the crank engine position neither of the two wires at any of the injectors pulse or solid or anything at all, at least ground anyways
thanks for anything further
fuses are all perfect, jsut checked every single one of them,
wire is reading ground with key all the way back into the off position , but when you turn on the ignition switch forward to on position and also hold the key in the crank engine position neither of the two wires at any of the injectors pulse or solid or anything at all, at least ground anyways
thanks for anything further
R72K5
Banned
Re: 94 grand am 3.1L stopped firing the injectors
update:
we have hot at injectors during crank but no ground ever
also i need to find out if the cam sensor is tied into the injector electrical system
update:
we have hot at injectors during crank but no ground ever
also i need to find out if the cam sensor is tied into the injector electrical system
Re: 94 grand am 3.1L stopped firing the injectors
The ignition module in the coil pack receives a signal from the crank position sensor, through the 3-pin connector on the module. The module then must send out a reference signal to the ECM for the ECM to know when to fire the injectors. Looking at a book for a '91 3.1L V6, it shows that the reference comes out of pin E of the 6-pin connector on the module. It's shown as a purple and white wire. If that wire doesn't pulse, then the injectors won't fire. /forums/images/graemlins/frown.gif
The ignition module in the coil pack receives a signal from the crank position sensor, through the 3-pin connector on the module. The module then must send out a reference signal to the ECM for the ECM to know when to fire the injectors. Looking at a book for a '91 3.1L V6, it shows that the reference comes out of pin E of the 6-pin connector on the module. It's shown as a purple and white wire. If that wire doesn't pulse, then the injectors won't fire. /forums/images/graemlins/frown.gif
R72K5
Banned
Re: 94 grand am 3.1L stopped firing the injectors
neat thanks /forums/images/graemlins/laugh.gif
i found out that there was no ground source in the black wire at injectors wire plug, so we found all the ground wires bolts ont he drivetraina nd loosened the bolts up and tightened them back up and now we have the engine running, but we noticed that the exhaust pressure out the tail pipes is really weak and extremely hot, more hot than it should be so we are pretty sure the cat converter is plugged up so tommorrow we are going to remove the converter and weld in a piec eof pipe, that should make it run like a whole new car.
ill posat back with results, ohg and i gave my stepdad a 92 cutlass suprem 3.1L coil pack setup and it made a big difference too, the car no longer misses like its got a dead cylinder.. phew! /forums/images/graemlins/thumb.gif
]
neat thanks /forums/images/graemlins/laugh.gif
i found out that there was no ground source in the black wire at injectors wire plug, so we found all the ground wires bolts ont he drivetraina nd loosened the bolts up and tightened them back up and now we have the engine running, but we noticed that the exhaust pressure out the tail pipes is really weak and extremely hot, more hot than it should be so we are pretty sure the cat converter is plugged up so tommorrow we are going to remove the converter and weld in a piec eof pipe, that should make it run like a whole new car.
ill posat back with results, ohg and i gave my stepdad a 92 cutlass suprem 3.1L coil pack setup and it made a big difference too, the car no longer misses like its got a dead cylinder.. phew! /forums/images/graemlins/thumb.gif
]
got_mud
1/2 ton status
Re: 94 grand am 3.1L stopped firing the injectors
might want to replace teh cat with another. back pressure and o2 sensor issues may make it necessary to have. all the late model crap i have worked on needed a cat or restrictor to keep the ecm happy. try the pipe with clamps and see if teh check eng light comes on or if it runs doggy. better than welding it in just to cut it back out.
might want to replace teh cat with another. back pressure and o2 sensor issues may make it necessary to have. all the late model crap i have worked on needed a cat or restrictor to keep the ecm happy. try the pipe with clamps and see if teh check eng light comes on or if it runs doggy. better than welding it in just to cut it back out.
R72K5
Banned
Re: 94 grand am 3.1L stopped firing the injectors
ok ill reccommend that to myu stepdad, we gonna do this here in a bit and see how she does after that, i expect a huge difference, this other 94 grans am i am driving right now we had to do exact same thing to cuz it was runnign extremely doggy and damn it runs like v-8 strong now. so,.,. it is a 2.3L quad 4 car, the one we workign on right now is 3.1L of course, so it should run like a 396 or 402 car hehe
ok ill reccommend that to myu stepdad, we gonna do this here in a bit and see how she does after that, i expect a huge difference, this other 94 grans am i am driving right now we had to do exact same thing to cuz it was runnign extremely doggy and damn it runs like v-8 strong now. so,.,. it is a 2.3L quad 4 car, the one we workign on right now is 3.1L of course, so it should run like a 396 or 402 car hehe
