Thank you for letting me join this forum, I have myself a new (to me) 1997 Wrangler 2.5l 4 banger with 33 inch tires and a pro comp suspension and 4 inch lift. The truck has 113k on it but the motor runs strong except
when it just starts, it idles very rough when cold at around 500 rpms. I did a full tune up including:
New Plug wires
New distributor cap
New distributor rotor
New serpentine belt and idler pulley
Oil change with slick 50 high mileage additivie
Lucas fuel injector cleaner (helped a little)
New oil filter
New air filter
Removed and cleaned throttle body and all attached sensors (helped alot w/warm idle, brought warm idle to 750 with slight oscillation but steady)
Coolant flush (muddy as hell before)
Cleaned/tightened batery terminals
Checked battery and alternator both are good at the full range
Now, when I start it it starts every time but sounds rough as hell and still oscillates like crazy down by 500 RPMs. When she is warm she sounds good and oscillates ever so slightly.
Any thoughts/ideas? I thought maybe idle control motor but that looks OK when i took it out, maybe TPS but that looked ok too. I miss the old simple idle adjuster screws, just one turn out is all it would need... Would it be injectors? Thought about the fuel filter but its the entire FPR up by the fuel tanka nd they are hard to find and are not cheap at all...
There is still an annoying clicking sound that I believe is a U joint on the front but thats still to be replaced and would have absolutely no effect on the idle...