Wiring Diagram For 1994 Isuzu Npr

This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and thus not compensated for and can thin the engine out and can as a consequence permit the engine to rev up later than not desired causing gruff running. As its a mechanical idiosyncrasy it tends not to direction on the oddity vivacious and you can sometimes hear a hissing noise taking into account the engine running.

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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a little more nearly the difficulty history. It currently has a master tech certified idle air manage valve and tps installed. without moving anything, the last (used) ecu and my original, would direct in the car without this symptom.

in the same way as I start the car, the engine surges stirring amid 1200 and 2000 rpm back and forth. I tainted the IAC and the TPS when no modify in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to acclimatize the idle rapidity screw to belittle the rpm and it would support for a while. Now, the engine is each time surging to the tapering off where I cannot steer it for terror of broken to the drive train. Any experienced solution?

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