Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 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. assist to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship later this car.. bought a used one.. more trouble. had the original 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 need to be re-adjusted? The master tech did all sorts of diagnostics on all similar parts (tps, maf, iac). $100-200 every become old I resign yourself to it complete the dealer for diagnostics.. on going problems are in reality additive up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. similar to I unplug it and control the motor, the car runs gruff and at 850ish. I can only guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don’t think the tps has that much run in the swap of rpm though? I think it abandoned adjusts it roughly speaking 1k..
I don’t have any check engine lights unless I unplug the MAF sensor. when the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is along with an intermittent popping sound coming at idle.
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