This is either a too lean, too rich or jumpy timing. No one likes it and can be bad enough to cause the motor to stall at not so great times.
Finally a faulty chip which should set a check engine light code 51 will cause a high idle because limp mode sets a high idle and a set ignition advance to allow you to limp home on the very basic of programming. so if you plugs are black don’t expect a good idle need to figure that out under fuel issue. Also a really rich fuel mixture will often cause a high idle. NO CARB CLEANER and some penetrating oil and work it in and out a bit and see if that helps. you can remove it can clean with WATER ONLY. Thing isn’t real cheap so we save changing it until last. Next, you can have a bad IAC (idle air control) valve on the side of the throttle body. Next cause for high idle is a bad coolant temp sensor in the intake by the thermostat housing as idle speed is temp based. Finding the leak can be tricky as it can be the intake gasket on the bottom side if you are using a Chinese junk carb intake or you weren’t real careful putting the intake on. TBI being a MAP sensor based system will see the leak just like opening the throttle blades and will feed the leak and then you have a high idle. this is most often caused by a vacuum leak. Idle surge or idle hunting and high idle.
Idle issues has to be one of the most common issues that I get contacted about. Pretty much all issues are going to fall into 4 catagories.ġ. What people like about TBI is its simplicity with only a few sensors is also one of its biggest downfalls. Works with any fuel injection really since most shops really can’t properly diagnose unless computer just tells them what is wrong and unfortunately with TBI that usually doesn’t happen. I have decided to create a page on trouble shooting TBI.
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