HELP HELP HELP!!!

[Bigsnow]

Everyone, I have a sick '94 that needs help.

I was driving a while back and my engine started running poorly. I made it home by high revving the engine but it died immediately after getting in the garage (idle.)

Engine can start and run, barely, and seems to be running on only a few cylinders.

I've tried:
Replaced headgaskets no change
Replaced Timing sprockets/ chain (thought it may have skipped a tooth. It was sloppy, and glad I changed it) no change
Replaced: camshaft sensor 2X, crank sensor, MAP sensor, ignition coil packs, BOTH ECU and the PCM. no change
Drained tank, fresh gas. no change
Fuel pump and filter are fairly new. I can hear it pump up at key ON.
Ignition wires are good, (And, a bunch going bad at the same time shouldn't happen.)
I've got spark on all cylinders.
Checked a few injectors. Screens are clear and they seem to function properly.

I am completely stumped.

It starts, and I can rev it up.... but it's definitely not running on all cylinders. Feels, sounds like three. The passenger-side exhaust doesn't even heat up. Driver exhaust does.

NOTHING I've done has made any change whatsoever.

HELP!!!!

 

[daveg]

No OBDI codes?
Did you try the Cycling Key trick to read them?

 

[99RT10GTS]

Weird, It does *sound* like a fuel issue. Did you change the fuel pump? Have you put a gauge on the fuel rail(scharder valve) to see if you are at 55PSI?

Fuel injectors- I would still pull them all and get them cleaned a checked professionally. Maybe even install Gen 2 injectors(red tops) to have slightly better fuel flow.

 

[Viper Specialty]

Where are you located?

 

[Bigsnow]

I live in Atlanta.

I have a code reader. I had one code for the MAP sensor at first. I changed that, as well.

I can only assume I have a wiring issue.

Anyone point me towards a pinout of PCM/ECU connectors?

Thanks to the responders!

 

[daveg]

I have a 92-96 PDF parts manual but i doubt it has pinouts..
Is the car stock?

 

[TEALLIFE]

any chance the crank pulley spun?

 

[Viper Specialty]

I live in Atlanta.

I have a code reader. I had one code for the MAP sensor at first. I changed that, as well.

I can only assume I have a wiring issue.

Anyone point me towards a pinout of PCM/ECU connectors?

Thanks to the responders!

Honest opinion, this needs to go to a shop with the proper scan tools that can check all of the engine I/O and see if everything is functioning properly electrically. Wish you were closer, this is exactly the stuff that I love... but trying to do it remotely is a nightmare. SO many things were "guess and checked" that the diag tree is a complete mess and needs to be started over.

 

[daveg]

any chance the crank pulley spun?

Hopefully not. If it did and the snout is bad, he will have to at a minimum Pin it.

 

[Bonkers]

Also remember, "New" does not mean "Not Broken." I just went
through four brand new starters on my Excursion before i got
one that could crank the engine.

Id recheck the "new" stuff just to be sure, focusing on whether you
have fuel pressure. It could be something as simple as a clogged fuel
line or clogged cat.

 

[eckeph]

Check the spark plugs on the passenger side after you ran it for a while. If they are dry then you probably have an issue with the injectors not getting any fuel or that they do not open. Check the fuel rail so it's not clogged. I seem to recall that all the injectors on each side goes through one connector per side, check that connector so it's properly attached.

 

[kblake905]

Everyone, I have a sick '94 that needs help.

I was driving a while back and my engine started running poorly. I made it home by high revving the engine but it died immediately after getting in the garage (idle.)

Engine can start and run, barely, and seems to be running on only a few cylinders.

I've tried:
Replaced headgaskets no change
Replaced Timing sprockets/ chain (thought it may have skipped a tooth. It was sloppy, and glad I changed it) no change
Replaced: camshaft sensor 2X, crank sensor, MAP sensor, ignition coil packs, BOTH ECU and the PCM. no change
Drained tank, fresh gas. no change
Fuel pump and filter are fairly new. I can hear it pump up at key ON.
Ignition wires are good, (And, a bunch going bad at the same time shouldn't happen.)
I've got spark on all cylinders.
Checked a few injectors. Screens are clear and they seem to function properly.

I am completely stumped.

It starts, and I can rev it up.... but it's definitely not running on all cylinders. Feels, sounds like three. The passenger-side exhaust doesn't even heat up. Driver exhaust does.

NOTHING I've done has made any change whatsoever.

HELP!!!!

Could be a plugged Catalytic converter?

 

[TEALLIFE]

Check the spark plugs on the passenger side after you ran it for a while. If they are dry then you probably have an issue with the injectors not getting any fuel or that they do not open. Check the fuel rail so it's not clogged. I seem to recall that all the injectors on each side goes through one connector per side, check that connector so it's properly attached.

Its easy to check with an infrared thermometer on the header. If there's no fuel, the header from that cylinder will be colder

 

[Copperhd]

You said you had a MAP sensor fault, which code was it? I would check that circuit or check for a vacuum leak to the MAP sensor. Another thing to remember is anything that causes the engine to run poorly may throw a MAP sensor voltage high code, which means engine vacuum is low.

 

[haneifk]

Maybe try a compression test and see what numbers you're getting.