Faulty Cruise Control?
Thread Starter
TECH Enthusiast
Joined: Mar 2009
Posts: 522
Likes: 0
From: West Chester, PA
Faulty Cruise Control? Hey guys, every once in a while my throttle seems to sit at a 1/4 throttle (maybe around 2500rpm) after I take it out of gear going from stop sign to stop sign or come up to a red light. I was wondering if it possible that my car is trying to resume it's speed like cruise control is engaged, or what. I shut it off the other day when it did it and it went back to normal idle. I haven't really had that much time to debug it with school and work all week.
Possible clutch issue?
Throttle cable getting stuck on something?
Any ideas, please let me know.
Possible clutch issue?
Throttle cable getting stuck on something?
Any ideas, please let me know.
Thread Starter
TECH Enthusiast
Joined: Mar 2009
Posts: 522
Likes: 0
From: West Chester, PA
I also can't tell if it is a throttle cable issue or not because after I shut it off it went back to normal idle when turned back over, would it go back to the rev's it was sitting at if it were stuck?
It is not the cruise control per-say... There are many fail-safes that would have to be broken for it to happen. #1 the clutch pedal sensor would have to be broke, #2 brake sensor would have to be broke, #3 the trans sensor would also have to be broke.
But it could be something with the line to the TB, which includes the cruse control module. If for some reason that is getting caught up, it could keep tension in the cable, and thus on the TB.
Check to make sure your TB is responding correctly. You can push it while the car is on and see if it returns tight and quickly. Check to make sure the cables are moving freely. You can pull the top off the cruise control module and make sure those are acting correctly. You can spray wd-40 to see if you can get it to stop... thats not a permanent fix, but it could help diagnose the problem. Once you find it you can get a better lubricant.
It could also be in your tune... There is a parameter for when you get off the gas, it keeps the revs up so the car doesnt die. Unlikely, but not impossible.
But it could be something with the line to the TB, which includes the cruse control module. If for some reason that is getting caught up, it could keep tension in the cable, and thus on the TB.
Check to make sure your TB is responding correctly. You can push it while the car is on and see if it returns tight and quickly. Check to make sure the cables are moving freely. You can pull the top off the cruise control module and make sure those are acting correctly. You can spray wd-40 to see if you can get it to stop... thats not a permanent fix, but it could help diagnose the problem. Once you find it you can get a better lubricant.
It could also be in your tune... There is a parameter for when you get off the gas, it keeps the revs up so the car doesnt die. Unlikely, but not impossible.
Thread Starter
TECH Enthusiast
Joined: Mar 2009
Posts: 522
Likes: 0
From: West Chester, PA
It is not the cruise control per-say... There are many fail-safes that would have to be broken for it to happen. #1 the clutch pedal sensor would have to be broke, #2 brake sensor would have to be broke, #3 the trans sensor would also have to be broke.
But it could be something with the line to the TB, which includes the cruse control module. If for some reason that is getting caught up, it could keep tension in the cable, and thus on the TB.
Check to make sure your TB is responding correctly. You can push it while the car is on and see if it returns tight and quickly. Check to make sure the cables are moving freely. You can pull the top off the cruise control module and make sure those are acting correctly. You can spray wd-40 to see if you can get it to stop... thats not a permanent fix, but it could help diagnose the problem. Once you find it you can get a better lubricant.
It could also be in your tune... There is a parameter for when you get off the gas, it keeps the revs up so the car doesnt die. Unlikely, but not impossible.
But it could be something with the line to the TB, which includes the cruse control module. If for some reason that is getting caught up, it could keep tension in the cable, and thus on the TB.
Check to make sure your TB is responding correctly. You can push it while the car is on and see if it returns tight and quickly. Check to make sure the cables are moving freely. You can pull the top off the cruise control module and make sure those are acting correctly. You can spray wd-40 to see if you can get it to stop... thats not a permanent fix, but it could help diagnose the problem. Once you find it you can get a better lubricant.
It could also be in your tune... There is a parameter for when you get off the gas, it keeps the revs up so the car doesnt die. Unlikely, but not impossible.
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On The Tree
Joined: Oct 2011
Posts: 132
Likes: 0
From: 20 minutes from the Valley...
Have you tried pullin your TB and cleaning the IAC/passages? When i was getting my car tuned i had to clean my IAC and spray some wd40 in it cuz it was responding too slow to tune idle airflow right and causing my idle to stay up around 2000-2500 rpms coming into stops signs and lights, and if i shut it off and restarted it it idled fine.
