Going Nuts- Rough Idle
Flash back to way back when, before I did the splitport swap, my old singleport engine not only had a rod knock but also idled rough. I then decided to swap in a used splitport motor from a 2002 mustang with around 80k. After I swapped in the new engine, I had to deal with little problems here and there just like any other engine swap, however one problem that I just can't seem to figure out is the rough idle this car still has. The car runs great and has plenty of power but at idle it shakes the whole car and you can hear it misfire in the exhaust tone. It seems like whatever is causing this rough idle wasn't swapped out when I did the engine swap (sensor, injectors, etc.). I also did a cylinder balance test and the misfire is effecting every cylinder.
Things I have replaced or tested...
- Plugs, Wires, Cap/Rotor
- Cleaned IAC, then swapped another in
- Ignition control module/Coil/ Distributor
- checked for vacuum leaks, checked all vacuum lines in both fenders
- cleaned fuel injectors
- Fuel pressure was checked when I had the singleport and was within spec
- Cleaned MAF
- No check engine light
- Motor mounts
It seems like I've tried everything and Im running out of ideas. If anyone has any input of what to check next would be very helpful. Thanks.
'97 Lincoln Mark Viii LSC - Stock
'93 Ford Thunderbird - Splitport & M5r2
'64 Chevrolet Impala SS - Stock
Last edited by Bay_Bird93; 10-17-2012 at 10:39 PM.