I have a 91 navajo with 105,000 miles on it I have already replaced the following.....IAC,MAF,IGNITION COIL,PLUGS/WIRES,O2 SENSOR, AND YET I CONTINUE TO HAVE ROUGH IDLE, it runs great has good power but idle is bad , at this point it is driving me crazy any one got any ideas....thanks
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check and or clean the (IAC) idle air control, this is what controls idling on most of todays cars and light trucks. if iac is removed for cleaning. clean out where it mounts to engine or fuel injection unit. good-day !
yea id definately try cleaning ur throttle body 1st. My 03 1500hd had the exact same bad idle after my battery went bad it would die at lights unless i kept foot on gas i cleaned throttle body runs perfect now took 30min cost 8$ for cleaner at autozone and theres how to videos on you tube
try cleaning the IAC (idle air control) sensor and check the hoses going to the MAF (mass air flow) sensor, i have found both causing me problems with erratic idle. the IAC was totally gunked up with carbon on the pintle and i had found that the screws holding it down were loose ( but only clean this with throttle body cleaner, not carb cleaner it might damage the sensor, and replace the vacuum hose to the MAF sensor, i found mine was cracked and old and brittle, a car that has been run poorly for a long period of time might also cause a problem with an oxygen sensor and this would lead to poor fuel economy also, try to clean that up or just replace it. Also have the transmission fluid serviced, i have seen this problem lead me to think i had an engine idle problem or rough perforamance when accelerating. can you rate this!
Check/change the #4 plug. Make sure the gap is right, ceramic not broken, and that the plug wire is on correctly.(both ends) Did you use dielectric gel when you installed the plugs? Good idea to use it.
The ignition coil should be fine at that mileage. If spark plugs do not fix it suspect a faulty MAF sensor. If the MAF is sending a bad signal it will affect with the idle as the ecu is trying to compensate for the MAF.
the problem may be a buildup of carbon or fuel varnish deposits in the idle speed control valve (also called the idle air control valve or IAC valve). The cure for this condition is to clean the valve with some aerosol throttle cleaner or engine top cleaner. disconnect the air ductwork from the throttle body. Start the car and run at about 1500 rpms spray the cleaner directly into the throat of the throttle body. Turn off the engine and let sit for a few minutes. Then repeat the process a couple of times. if that does not work, you can remove the IAC and clean it by spraying into the two holes on the underside of the valve. If not, then you need to replace the valve.If that does not work , then check for a code. the throttle position sensor may be the problem. you can have it scanned at an AutoZone or other parts store.