Hello. I have a 2001 Ford Taurus with a 3.0. Last couple of weeks it has been 'misfiring' in idle. When I start up the car, the engine shudders and shakes randomly like extra random heartbeats. When I am driving, there is no problem and the random shaking goes away but if I come to a stop light or sign, the engine will randomly shake again. Does not seem to affect the driveablilty of the car but is worrisome regardless. My check engine light has been chronically on for about a year but had a buddy run the code and it is due to a bad seal on my gas cap. I was wondering if it is due to a bad spark plug(s) or plug wire(s). Anyone with any insight?
My '03 similar, random misfire at dead idle, but perfect running anything above idle.
Checked plugs, wires, coil pack, IAC
, in fact switched things from my '01 to the '03 with no change at all, No codes. Added a vacuum leak by pulling a hose and it did not create the kind of rough idle I see. I took an old propane torch and removed the jet, put a hose on it and let propane go into the vacuum leak I made, and it did not change the rough idle. Momentarily increased speed.
However, in thinking: I pulled the hose on the EGR
and put a hose on it, sucked a slight pull on it and it made it much worse. So here is the thought, any leaking of the EGR
at idle will make a rough sometimes miss at idle. At any speed over idle the EGR
opens and the engine system expects EGR
flow. Not at idle.
So, here is one thing that could explain rough idle, but no issue above idle.
Next plan is to replace the EGR
Will get back on this one.