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86 Grand National very low mileage Runs great till Rpm gets into a higher range seems to backfire or just no more pull. Tuned up and injectors cleaned. Tried Known Good maf and Computer. Replaced esc module crank sensor. O2 reads rich and fuel pressure is 50 psi. Exhaust not plugged air filter is kn. Tried supplimenting propane in air intake and it slowed down.

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  • Cars & Trucks Master
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Try compression check. Maybe distributor.

Posted on Sep 23, 2017

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SOURCE: engine code 43 lights up engine has spark knock

code 43 throttle position sensor out of adjustment.not working.if you replace knock sensor and it still spark knocking.make sure the wire connector is not broken.go to higher octane gas .make sure engine timing is correct. also make egr valve is opening when it suppose to it will cause detonation.you will need a scanner to check tps and egr valve.

Posted on Jun 17, 2009

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SOURCE: installing tuned port back on 86 iroc but using

The tuned port injection is specific and need's the proper wiring harness for the application, and the same with the computer.

Posted on Mar 07, 2010

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SOURCE: Runs Fuel rich-miledge is down 50%, exhaust smells rich

Had similiar problem in my 93 buick limited. Changed cadilitic converter - no help. Replaced ignition coil (very easy) and car runs like a top again. It takes 3 coils - replace one of the 3 until you solve the problem.

Posted on Mar 22, 2010

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  • Check the servo first. Maybe the servo needs to be clean and also make sure that the engine is properly tunedup. Ihave the same problem also but when I replace the servo everything now is working fine.
  • If you have questions feel free to reply to this solution.


I’m happy to assist further over the phone at https://www.6ya.com/expert/ramy_d9e7ebea3891f482

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