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Car Forum / Ford / Ford Cars / June 2006high idle
i have a 88 cougar with a 302 in it my problem ia s fast idle. i changed the iac but still fast idle. any ideas so i wont keep replacing parts i dont need to? when started cold it revs up then down till it finds right rpm. but when hot, i keep a fast idle. i want to fix it before i lose a ujoint as it jumps in gear. please help. > i have a 88 cougar with a 302 in it my problem ia s fast idle. i > changed the iac but still fast idle. any ideas so i wont keep replacing > parts i dont need to? when started cold it revs up then down till it > finds right rpm. but when hot, i keep a fast idle. i want to fix it > before i lose a ujoint as it jumps in gear. please help. First: Make sure the PCV system is in good shape, including the oil-separator screen below the PCV valve hole. now to troubleshoot: Then get engine warmed up and disconnect/plug all vacuum ports on intake EXCEPT the fuel pressure reg. Then stop, disconnect IAC harness, start and check that engine idle is about 500-550 rpm. If above that or still fast idle, you either have a vacuum leak or someone has messed with the stop screw.. but if cold idle is good, I doubt either I suspect, if idle is good (lower than 650) with IAC plug disc; and the Check engine Light comes on with key on, then goes out, and doesnt show with engine running, you may have a bad Throttle Position Sensor (TPS) - or wiring to it. Bad TPS doesnt set the CEL in EECIV (or most of them, anyway). If it is still the adjustable version you need borrow a DVM and set it to .90 to .99 volts with the throttle on the stop screw.  SignatureYeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price you pay..DEAL with it! > > i have a 88 cougar with a 302 in it my problem ia s fast idle. i > > changed the iac but still fast idle. any ideas so i wont keep replacing [quoted text clipped - 26 lines] > Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price > you pay..DEAL with it! caint find a pvc valve. i got a hose coming from the valve cover straight to trottle body. > > > i have a 88 cougar with a 302 in it my problem ia s fast idle. i > > > changed the iac but still fast idle. any ideas so i wont keep replacing [quoted text clipped - 26 lines] > > Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price > > you pay..DEAL with it! > caint find a pvc valve. i got a hose coming from the valve cover > straight to trottle body. Unless it's a weird setup and the PCV is in Valve cover and that hose goes to intake between TB and valves, it's there... back of engine, into cam valley. SignatureYeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price you pay..DEAL with it! > caint find a pvc valve. i got a hose coming from the valve cover > straight to trottle body. [quoted text clipped - 29 lines] > > > Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price > > > you pay..DEAL with it! The PCV valve: http://markvii.homestead.com/pcv.html thanks for the picture > > caint find a pvc valve. i got a hose coming from the valve cover > > straight to trottle body. [quoted text clipped - 31 lines] > > The PCV valve: http://markvii.homestead.com/pcv.html >i have a 88 cougar with a 302 in it my problem ia s fast idle. i >changed the iac but still fast idle. any ideas so i wont keep replacing >parts i dont need to? when started cold it revs up then down till it >finds right rpm. but when hot, i keep a fast idle. i want to fix it >before i lose a ujoint as it jumps in gear. please help. BYM's procedure doesn't find it, you may have a leak between the upper and lower intake. Problem was mostly in trucks but , not unheard of in cars. Lugnut lugnut, i think your on to something. ive been noticing that when i turn on my heater which is vacum controlled they keep opening and closing. could that be related? > >i have a 88 cougar with a 302 in it my problem ia s fast idle. i > >changed the iac but still fast idle. any ideas so i wont keep replacing [quoted text clipped - 7 lines] > > Lugnut >lugnut, i think your on to something. ive been noticing that when i >turn on my heater which is vacum controlled they keep opening and >closing. could that be related? Not likely that the intake problem would/could cause that. You either have a bad vacuum check valve or a vacuum leak in the hvac. This is beyond the manifold. If you have a large leak in the hvac control, it could result in high idle. >> >i have a 88 cougar with a 302 in it my problem ia s fast idle. i >> >changed the iac but still fast idle. any ideas so i wont keep replacing [quoted text clipped - 7 lines] >> >> Lugnut |
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