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Author Topic: idle problem drews50 CAFords OG Member # 2670 posted                                 i just bought a 90 droptop and it's starting to take a couple of seconds for the RPM's to fall back to normal after i take my foot off the throttle. it happens in every gear and every time now. anyone? -------------------- *shiftylx* 2013 Race Red 5.0 "Lucy" 1967 Lime Gold 289 coupe "Ethel" Posts: 2457 | From: phoenix | Registered: Apr 2003  |  : SBSkid ¯ Member # 2560 posted                              I have the same problem every time I push on the clutch the rpm go up then it comes down while driveing. Then at a stop my idle sometimes does goes up and down between 2000rpm and 900. its crazy. -------------------- You get what you pay for. Posts: 46 | From: san jose | Registered: Mar 2003  |  : 92coupe ¯ Member # 1957 posted                              damn this same thing happened to my friend, i cant remember how he fixed it. ill ask him though, but be happy, my car rarely idles at all. -------------------- 94-GT BLOWN & STROKED Posts: 1209 | From: antioch | Registered: Oct 2002  |  : Bill/APEX Motorsports ¯ Member # 636 posted                                 As long as the throttle body is clean and isn't sticking open slightly, it could be the idle air bypass valve. On the older cars, we see them dead all the time. That can cause idling problems. Check to see it's working by unplugging it at idle. If the idle drops or the engine stalls, it's working. If nothing happens, it should be replaced. They're only about $38 or so. It could also be the throttle position sensor. Have you checked voltage? It should be roughly .95 volts. Then there's always the possibility of a problem with the mass air meter or engine coolant temperature sensor... There's a whole host of things to look at on older cars such as yours, and it can be frustrating trying to diagnose. Argh... [ April 06, 2003, 10:16 PM: Message edited by: Bill/APEX Motorsports ] -------------------- Bill Kaiser APEX Motorsports Santa Clara www.apexmotorsports.com 408-562-1000 bill@apexmotorsports.com Posts: 488 | From: Santa Clara, CA | Registered: Dec 2001  |  : The Nick ¯ Member # 2244 posted                              My car does it because its still a speed density car and the computer has no idea what is going on with the higher lift cam. Depending on what year your cars are, that could be it. -------------------- Fast, Cheap or Reliable. Pick two and live with it. Posts: 1215 | From: The Delta | Registered: Dec 2002  |  : Blue Oval ¯ Member # 2548 posted                              my car was tweakin like that and i changes the o2 sensor and it solved it Just a thought -------------------- 65 Coupe 306, AFR's 89 Cali. Ed. Saleen "sold" BAB 89 GT 08 Yamaha R6 Posts: 2345 | From: Sacramento | Registered: Mar 2003  |  : AcesWild85 ¯ Member # 2616 posted                              Try pulling your throttlebody and idle air bypass and clean them out with some throttle body cleaner. AMSoil makes this foaming intake cleaner stuff that works really well. You can shoot that stuff into the intake manifold and it breaks up a lot of crap. My car ran soo much better after doing this. I felt a very noticable seat-of-the-pants increase in power after doing this. If you want to go the whole 9 yards, get a bottle of techron (or 2) , and with your engine running, take the black vacuum line from the intake and stick it in the techron and let it drain the bottle(s). Let the car sit atleast over night. Then when you start it up, it will smoke pretty bad, but it will run better once it burns all the s**t off. -------------------- College student and U.S. Marine; The possibilities are endless... Mustangs aren't built; they're born! Posts: 844 | From: San Jose, CA | Registered: Mar 2003  |  : drews50 CAFords OG Member # 2670 posted                                 is the vacuum line the one underneath the intake? -------------------- *shiftylx* 2013 Race Red 5.0 "Lucy" 1967 Lime Gold 289 coupe "Ethel" Posts: 2457 | From: phoenix | Registered: Apr 2003  |  : 87mustang ¯ Member # 2496 posted                                 i was told that its the computer thinking what to do! -------------------- BEAT YA Posts: 159 | From: 831 | Registered: Feb 2003  |  :

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