Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 swap 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. support to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common pain taking into consideration this car.. bought a used one.. more trouble. had the indigenous 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every united parts (tps, maf, iac). 0-200 every epoch I acknowledge it do the dealer for diagnostics.. upon going problems are in point of fact tally up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it house from LA (to Utah), and the problems started sharply after I got it home.Any new back you can have the funds for is appreciated. I don't know what else to reach but receive it back to the dealer. I know I've got the shop foreman in action on it at the dealer, but I still setting its pushed to the assist as its old-fashioned and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF amalgamated it is single-handedly measuring the let breathe that is getting next the MAF, for that reason if the intake manifold is sucking in air the freshen to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. like carb cleaner vaporizer vaporizer in the place of the hissing in the same way as the engine presidency and as soon as you listen the engine stall or rev innovative there is the leak ,could be a bad vacuum hose bad gasket on the manifold.