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Hello, I'm a newbie here. Just bought my first Toyota ever, a 1985
pickup with 146K miles. The engine starts readily and pulls well.
The idle is smooth, but that's the problem. The truck failed state
inspection because the idle is too high. How does one adjust the idle?
The engine has a two-barrel carburetor. I don't see any idle stop
screw or idle mixture screws. All the vacuum hoses look good... no
cracks, no breaks, nothing mysteriously disconnected or blocked off.
Please advise.
Daniel B. Martin
Hi, I have Toyota,1990, The idle speed is too high in winter time,but not in summer time,How to deat with it? Thanks Simon
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repost with the spec differences beween the two engines Im a bit foggy here..Im thinkin one had or has intake restrictor plates under the intake for not letting hot gasses enter under the carb mount...
Had the same problem on an 87 pickup not 4x4. Check the rubber fuel line from the tank to the engine, mine was so old that when the engine tried to **** a lot of gas the rubber line collapsed and restricted the amount of gas getting to the engine.
I would have a look at your coolant sensor, if it's reading the wrong temperature, it will cause a idle problem. If you can, get a scanner on it to verify it's operation.
Sounds like you have a vacuum leak somewhere. There may be a stop adjustment on the throttle body, but usually high idles are due to unmetered air entering the system.
My first guess would be a dirty carb/fuel injector set. Run some fuel cleaner through the tank and see if it gets better. You might have to do it through a couple of tanksful. How long since you've had a tune-up? It might just be that time.
When the engine is running ragged, place your hand over the opening of the carburator. If the idle smooths out, you have a vacuum leak somewhere on the intake system; it could be the base gasket for the carb, the intake manifold gasket, or a broken vacuum line, or a combination of that. What you have is too much air getting into the engine, but the air is not going thru the carb. Please check for vacuum leaks, you can use a can of carb cleaner, spray the intake manifold, if the idle smooths up, that would be a good place to start.
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