92 lesabre running bad after warming up, can only drive a little ways

[hellfirebob]

Update,
I replaced the timing chaing and it was bad , the tentioner was so warn out and there was about 1.5 inch of play in the chain. I got it all back together last night and it sounded like a new car and ran great but after driving for 10 min it would start to back fire through the intake again. If you go slow into the gas it will do ok but miss, I am at this point thinking there is a bad coil.


Ok this sounds like my problem.

I am having problems when the car warms up after about 10 min then it will start to back fire through the intake.

Parts replaced

1. camshaft sensor
2. crankshaft sensor
3. computer
4. fuel pump
5. pulled the converter
6. tps sensor
7. cold start sensor
8. egr valve

So the car will not give any codes at all , and when it gets warmed up
it will run ok as long as you dont try to get into it, if you push on the gas too hard it will stumble and back fire through the intake. The car has about 207k on it and well taken care of.
I Have to ask maybe some one knows , the book tells you jack but if the magnetic pickup falls off the timing gear will it toss a code? Also from the way it acts it sounds like a timeing problem but could be coils so I am at a delma on what to do next..

Please help if you can Thanks In advance

[hellfirebob]

Sure sounds like a clogged catt , you may want to see if you can unbolt it and test.

Update on my buick I ran the thing for a couple days and it finally pushed out a code 34. I pulled the air cleaner it was much better but after a couple min it would toss a code 34. I have missplaced my book could some one tell me what code 34 is and would it have caused all the back fire and crap ?

[srthompson]

I would try and find someone with a timing light. Your car could be slightly out of time. If your car is idling rough but doesn't backfire, you timing could be too fast. If your car is idling rough but it does backfire, the timing could be too slow. I would try the timing light first, it should be the least expensive. Hope this helps

[srthompson]

This is all I can tell you. Hope this helps!

CODE 34

Trouble Code 34 indicates that the Mass Air Flow (MAF) sensor is reporting less air is entering the engine than makes sense based on RPM and TPS. The MAF sensor produces a frequency output; around 30 Hz at idle to 150 Hz under acceleration. The frequency varies proportionally to airflow. The ECM monitors the frequency and thus determines airflow into the engine. Typical idle MAF is 5 to 7 grams per second.

The conditions for setting this code are:

no Code 21 or 22 (TPS Error) present, and
the air flow reported is < 4 grams per second, and
TPS indicates 10% or more throttle position, and
the engine speed is 1800 RPM or higher, and
the above conditions exist for over 5 seconds.



Typical causes for this code include:

1) Faulty air ducting to or from MAF sensor
2) Faulty ECM-to-MAF connections
3) Poor routing of MAF harness (i.e. near coil packs)
4) Maladjusted TPS sensor
5) Defective MAF sensor
6) Defective ECM