1991 Chevy 2500 Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 swing used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. yet had issues. urge on to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering afterward this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS habit to be re-adjusted? The master tech did every sorts of diagnostics upon all associated parts (tps, maf, iac). $100-200 all era I undertake it attain the dealer for diagnostics.. upon going problems are in reality adjunct up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick anomaly find if you unplug the meter and rule the engine without it. if the engine condition is the thesame subsequently chances are the meter or the relationship to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can get coated taking into consideration dirt exceeding time which subsequently offsets the reading. Use some entrance cleaner or brake cleaner to spray onto the wires to remove the dirt on no account touch the wires with everything as they are categorically fragile

I'm reviewing your ask now, and will post back up in imitation of your reply ASAP. Rgds Greg. What oddity codes reach you have. Does the engine control taking into consideration the MAF disconnected. similar to the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF combined it is deserted measuring the ventilate that is getting in the manner of the MAF, suitably if the intake manifold is sucking in air the ventilate to fuel ratio will be certainly out and cause the engine to stal

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