Question about 1995 Buick Park Avenue

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95 park avaenue runs extremely rough

I have aquired a 95 buick park avenue from a friend, that suddenly stopped starting/running. By this it would turn over fine, new Battery just three weeks prior, and it would startenoght to disengane the Bendix on the starter. He took it to a mechanic and was told that a pebble got into the ingnition cyclinder and was causing the car not to run, because the security system was shutting down the fuel. this repaired the Car would run without much power. He claimed because my friend had tried repeatedly to start it and it back fired and caued the timing chain to jump. That was too much for my friend to spend so I bought it for 200 bucks thinking easy fix already diaginosed. I got it and did some prelims and found Fuel Pressure might hit 26 psi. Bingo! I thought replaced fuel pump and Pressure is no in the 60 psi. Checked for spark have great spark but tested the Ingnition Control unit it passed but I borrowed my father in laws to also test with (his engine is seized so won't need) no difference with mine or his. Still wouldn't start/run, not run at all.
Tore into the timing chain and thought it was doubtful it being the timing after I heard and saw these things, and thought it was probably Crank Position sensor. Got to the timing chain and it was perfectly timed took pics for my own peace of mind. Put it back together and replaced the cam sensor and the Crank sensor. Figuring I had nailed it. Tried to start it and I was able to get it started and it ran bad. Popping, missing, seems better at around 3000 + rpm but not right. No idle at all. With it running like **** no check engine light. I am thinking MAF, TPS. Cleaned the MAF and go no different results. Any ideas?

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Disconnect the MAFsensor. If the engine power is then ok, replace the sensor. Basic maintenance first. Fluids, filters, grounds. And wash the thing.

Posted on Aug 02, 2013

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Check your firing order and EGR operation. You need to check the basics before sensors. Try using a vacuum guage to check the condition of the bottom end and the valve train. If ok, you need to get a scanner hooked up read the inputs.

Posted on Aug 31, 2008

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Ok one quick check you can do check the fuel pump relay and make sure it's not weak. it make kick in and then disingage. make sure all your cables and ground straps are tight. then if you can get it to start and run. remove the positve battery cable . if it dies your regulater in the alternator is junk. get the altenator replaced. also if the tps is good then you have a glitch in the ecm. and you can get a used one for about 200 bucks from a salvage place.

Posted on Aug 31, 2008

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Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.
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