Been having a rough idle on my truck for a little while now & can't figure out what is causing it. At higher RPM's & driving it's fine, but when I just sit there it just idles rough. Replaced: spark plugs, spark plug wires, fuel filter, IAC Cleaned: MAF sensor, throttle body Read online that it could maybe be the EGR valve. Where is the EGR located, if it even has one? Anyone have any insight as to what the problem might be? Thanks
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If it were the EGR, you would be throwing a check engine code. You may want to try replacing the IAC itself. I had the same issue, cleaned the IAC and it was shot. I bought a new one and idle was fine Welcome by the way!
Yeah hasn't thrown a code at Advance, might go to Oreilly's because I hear they have a more advanced machine. I've read that alot of 3.0 rangers have the same problem..
Hooligan and I both have the 4.0, so it's a bit different. I have a pretty good miss now because of a few things wrong.... When you drive, does it make a really loud whooshing noise? Or is it quiet?
3.0's are bad bout blowing the egr vac lines.. the lines are on the right side manifold and go up to a small gray box on the front of the air mainifold.. i would check that as well
listen for a vacum leak. see if you here a high pitched sucking sound, and if you do, spray carb cleaner on it (only when engine is cold, if its hot it could start fire) once you identify where the leak is coming from, replace that part, usually a cracked rubber tube. ive got a 4.0 it idled really rough and sometimes died, but went away once i got in higher rpms.
