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1990 3300 MPI Hard Start, Rough Idle, then Dies.
Hello all,
First post on this board. My brother-in-law has an old 1990 Century that is having some issues starting and poor idle. It currently is not driveable.
Basically he said a couple days ago they were driving it home and it started running really ruff and died then they ended up toeing it home. Well I went and had a look at it today it was throwing up two codes. A 21 for the TPS and a 43 for the ESTC or Electronic Spark Timing Control.
My brother in-law changed the TPS last night but wasn't sure how to adjust it. Its a three wire so I checked his Chilton and it said for that type just set it so the levers touch from the throttle and the TPS. I did that also tryed moving it around. This puppy don't want to start. So I tryed old tps wouldn't start either. Pulled a wire and checked was getting spark. So pulled a couple plugs. This thing has the Spark Control Module with the 3 coil packs sitting atop it. I tryed two plugs both on a diffrent coil. Each was black with soot and carbon. This thing is getting a ton of fuel and I looked at the airfilter its been backfiring into the airfilter a bit also before it decided not to run anymore.
Well after looking up codes I saw lots of peps saying control module so I pulled it had it tested. It was good after 6 tests in a row all good. So after reinstall started once very rough idle and rough running even when it would rev a bit. IT was sucking air in via Mass Airflow Sensor.
After we reinstalled the control module we hooked batt up again and it started and ran rough. I tryed moving module around a bit to see if it needed to be adjusted. Saw NO noticable improvments.
After that got a diffrent TPS code a 22 and the same 43
Not really sure where to go on this. Any ideas are appriciated..
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06-09-2004, 10:24 PM
