ENGINE RUNS ROUGH / STALLS

1995 Mercury Marquis

Tiny

rspuz

July, 31, 2010 AT 6:36 AM

Engine Performance problem
1995 Mercury Marquis V8 Two Wheel Drive Automatic 147000 miles

I had a leak in the heater supply line ( it runs under the intake manifold) removed the manifold repaired the hose. At the same time I cleaned the egr channel in the throttle body ( it was clogged and the check engine light was on) Also the pcv line into the throttle body was leaking and I repaired that. After reassembling everything. The battery was disconnected throughtout the repair. I started the car, the check engine light was no longer on and it ran for about 2 minutes before shutting down. I found that the air filter was very dirty and tried running it without one with the same results. However when I ran the vehical with the air intake disconnected from the throttle body it stays running but after a few minutes it idles rough. At this point I suspected the MAF and tried running the car with everything assembled and the MAF disconnected, it ran but if I plug the sensor back in it stalls immediatly. So I figured it needs a new MAF sensor. After replacing the MAF sensor it still does the same thing.
I'm leaning toward the TPS (cleaning or replacing) But I want to avoid hit or miss part replacment.

FOUND 4561 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

1 Answer

Tiny

rasmataz

July, 31, 2010 AT 6:49 AM

Clean out the idle air control valve and then test the throttle position sensor and intake air temperature sensor

Please login or register to post a reply.

How to read codes Chevrolet Blazer
Read Codes Like a Pro
Code Read Retrieval/Clear
 Step by Step video GMC Yukon XL 2000-2006
Code Read Retrieval/Clear Scion XD
Code Read Retrieval/Clear Honda Civic