I have 92 Isuzu Rodeo running rich on fuel along with high idle issue every once in awhile. I have change MAP sensor, EGR, OI sensor, cleaned the throttle body, replaced the TBI senor and now I am still at a loss. It runs alot better but every once in a while it will start idling at 2-3 RPM again without the check engine light coming on Anyone have any other suggestions???
IAC - idle air control valve . What are the fuel trims at ? Are they with in + or - 10% short term an long fuel trims ? Do you know what fuel trims are ? What's the IAC counts at looking at scan tool data ? Or are you just guessing to find a fix ?
007 Idle Speed Problems Scan Data for Idle
Hooking up a professional type scan tool an viewing scan data is the proper way to diagnose these type problems . Your dealing with a computer .
SOURCE: 1996 isuzu rodeo keeps reading
A misfire alarm typically means the coil pack mounted above the sparkplug indicated in the misfire had gone defective.
To test it, swap the coil pack with another cylinder, and see if the misfire goes from #2 to the cylinder you put it on.
If the misfire continues to be on #2, then consider changing the sparkplugs.
I hope this helps.
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