2002 Ford F-150 Q&A
2002 Ford F-150 Question: Engine Idles Rough
02' F-150 Sport 2WD Triton V8 4.6L COP's. Rough Idle. In drive or park. Symptom appeared immediately. Check engine soon light came on 2 days later (not blinking). Often lose power...normal breaking into a turn, lights dim, brake power dies, steering tight. Some bucking/spitting while gradually accelerating out of turn. Increase acceleration swiftly and she smooths out and gets up a little, but still notice weakness in power. Also cruising at 55, let off gas and she'll hold rpm for 10-15 sec and then deccelerate as it should when I took foot off. Local mechanic doesn't know. Already tried Mass air flow and Idle air control sensors. Could this be vaccum leak or throttle position sensor? - Visitor
What codes where registered in the ECM when they scanned the system? The throttle assembly might need some cleaning. I'd also check the EGR valve, make sure it's not keep stuck in the open position. Zee - ZeeTech
I'm thinking you could also have a fuel control or supply issue. Just a hunch until you get the codes out of the processor, as Zee said. - DaveJHM
problem has just started. obdII memo scanner shows codes po156,po161 and po171. these are bank 2 sensor 2 codes with the exception of the 171 code. is the right side of engine,from drivers seat ban...
my truck idles rough and my heater will not blow hot , but yet the temp. is normal so it's not the thermostat,what could it be?
i have changed plugs, checked coils, replaced dpfs for egr,it does have 225000 miles.does not set any codes, have checked for vacuum leaks, have not found problem yet.ruff idle at all times but run...