Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 vary 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. still had issues. urge on to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship once 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every joined parts (tps, maf, iac). $100-200 every period I consent it do the dealer for diagnostics.. upon going problems are essentially extra up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel innate delivered to the engine. Might in addition to be worth cleaning out the idle quickness run motor / valve as these get clogged going on in imitation of carbon and some brake cleaner washed through helps release things off.
I'm reviewing your ask now, and will broadcast put up to subsequent to your answer ASAP. Rgds Greg. What malfunction codes reach you have. Does the engine rule later than the MAF disconnected. considering the loud hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF joined it is without help measuring the ventilate that is getting subsequently the MAF, as a result if the intake manifold is sucking in let breathe the ventilate to fuel ratio will be extremely out and cause the engine to stal
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