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Toyota Repair/High idle adjustment
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Question
I have just replaced the engine in a 1996 Toyota T100. It is a 3.4 engine. I replaced it with a 1997 4-Runner 3.4 engine.I kept the 96 plenum and put it on the 97 engine. with a few other pieces that were swapped. It starts and runs fine and even drives good. But it idles at about 1800 rpm. Also when I have it in park and press the gas pedal and slowly increase the rpm when it reaches 2500 and I hold it there it will run up to 3500 and then drop back to 2000 repeatedly. My repair Manuel say that the idle isn,t adjustable and that the ECM controls it. Is there maybe a sensor or something that I have missed in the change over or am I going to have to take it to a shop and get it checked on a computer to get it adjusted.
I don't think the computer part numbers are the same for the 4- Runner and the T-100 and that's where the problem may be, is there a way you can check the part numbers of the computers, if not contact the toyota dealer parts department and ask them for the computer part numbers for both of the vehicles if they are the same then there's no problem but if not I would suspect that this is where the problem lies.
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Ted Ritter
Expertise
I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for almost ten years an have answered over 16,000 questions helping Toyota owners with their problems without any compensation, some of my answers are published on many other websites via google and other search engines. AllExperts recently added a new feature which allows questioners to donate to experts on the site, any amount of donation is very much appreciated, to make a donation just click on the DONATE button.
Experience
Toyota technician since 1979,expert in electrical systems,OBD systems,engine repair, driveability problems,EFI systems,ASE certified,Toyota master technician.
Certified Hybrid Vehicle technician.
Education/Credentials
Toyota master technician, ASE certified in eight catagories, Hybrid vehicle certified.
Toyota technical training:
Engine
Automatic transmission
Manual transmission
Drivetrain
Electrical systems
Brakes and chassis
Air conditioning
Engine performance and diagnostics
Hybrid systems
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