At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
1996-2.4 cavalier-auto.. Seems a dead spot in throttle just above idle (idles perfectly) but when given slight throttle in 'D' starting out it has this 'spot'.. at maybe 800rpm..or so.. elsewise: starts & runs perfect..
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Start with the basic tune-up stuff, new plugs, use carb cleaner spray in the throttle body and idle jets. Check for vaccum leaks on all the hoses that connect to intake manifold.
I've seen these obd1 gms sometimes have an issue with the throttle position sensor and not throw a code. That's probably what is going on in this case here. The TPS is a rheostat that gets wear over time. It probably has a wear spot at partial throttle that is making it "lose position" and it finds itself again when you get out of that wear spot.
I had same issue with my 98', after replacing plugs,wires,map sensor,searched time and time again for vac leaks,both o2 sensors etc.the negative terminal wire from battery to engine was slightly loose at the engine.I pulled that end off and cleaned and tightened and ran like a champ immediatley! Only reason i found that problem was accidental,when i was shaking some wires around it arched at that spot.
Hello my name is autoteck21 sounds like you dealing with one of two things. #1 Either you have a vacuum leak in one of your hoses or your vacuum box at the worst case one of your vacuum control
solenoid. #2 Your idle air control module (under your throttle body.) To test #1 take a can of brake clean or carb/choke cleaner and in small 2-3in areas spray little spots while engine is running listen too your idle for any changes (you will here the differences) if so there's your leak. To test #2 find the little connector (2 wire) under your throttle body (when standing in front of your car lower front side under intake pipe hose clamp)
It sounds like there is a problem with the Idle Air Control (IAC) valve. Its job is to open and let air into the manifold when the throttle is closed at idle. If it does not open, the engine dies at idle. The IAC is mounted on the throttle body. Possibly the valve is clogged or stuck, in which case it could be ok again if it is removed and cleaned. Or it is broken, and needs to be replaced. Or, there is a problem with its electrical connection, that needs to be traced. Good luck, let me know if you have any questions.
If they removed the battery cable, the on-board computer (PCM) would have been reset to a "learn" default. The idle will rise slightly until the PCM can relearn the proper position of the idle air control motor (IAC). In order for the PCM to do this, the car must be driven above 45 mph for several miles ( 5-10 ).
Another option is a vacuum hose was damaged or cracked during the repair. Take a look under the hood at the vacuum hoses at the throttle body and brake booster, make certain no hoses are disconnected or cracked. You can start the car and listen for vacuum leaks or "hissing" noises from the hoses.
Give both a try and let me know, we can go from there.
Regards,
Look for a vacuum leak (lines and intake), Is the engine light on, were any codes present? A faulty EGR or IAC could cause the problem too. Check the throttle cable for any restrictions.
×