I have a 91 plymouth voyger and it is idled really high. I have changed the trottle sensor and still high..?

Question

what could be the problem and how do I fix it?

Answer 1

It could be either a coolant temp sensor or its connection, or it could be a vacuum leak. Look to the PCV valve and make sure it is intact. If the pintle is missing, it will idle VERY fast.
It is also possible that someone removes the idle adjustment plug and dialed up the idle for someone insecure with the normal idle (such as a senior with impaired hearing.)

Answer 2

both iknowthisone and carzzz have good starting places. Leaks around the intake are common on the Voyager as is the Idle Air Control motor. You can check for vaccuum leaks by spraying carburetor cleaner around the outside of the intake mainfold while the engine is running, just make sure its not TOO hot when doing this and you avoid getting any on the exhaust mainfold if possible. If there is a leak while doing this the idle will change and run more smooth or will speed up. I hope this helps!

Answer 3

Check for a vacuum leak especially the gasket between the throttle body and the plenum. This is a fairly common cause of a high idle on these vehicles. Also I assume you have made sure all the linkage is correctly hooked up and not binding. But check that gasket I have seen this cause the problem you describe quite a few times. Good luck.

Answer 4

check on the side of the throttle body for a round object the size of a quarter and about 4 inches long it is called an iac(idle air control) motor its job is to vary the amount of air to the engine. over time it will get full of carbon deposits and cause the pintle to stick. this is a very common problem and easy to repair. you can clean it with throttle body cleaner but it is not a permenant repair
the part is under 100 dollars and takes less than 10 minutes to replace.

Answer 5

problem could also be engine coolant temp sensor....(the computer thinks the engine is cold)