the thing is, as you probably know or are finding out, your symptoms could be caused by just about anything from fuel system, to smog components, to ignition system, to engine mechanical, etc, etc.
Quote:
|
Originally Posted by nickpapa
...i also took the wires off the coil one by one with the car on to see if there is spark. there was spark except for cylinder 6 which had spark but it didnt seem as strong as the others. could that be the problem?
|
could be, and it could be intermittent, especially under load, but i'd think just one cylinder acting a bit weak wouldn't cause the symptom as described.
Quote:
but i do notice that when in drive, it will stutter/misfire, yet in reverse, it doesnt at all??
|
this sounds either coincidental, or perhaps a result of the different gearing giving a different affect.
Quote:
|
also, as i said above, the pcv valve grommet was ripped at the bottom so it was very easy to just pull up and out. would this cause the problems im having?
|
again maybe. it ought to be tight, otherwise the leak will affect engine especially at idle. just seal it temp with some cloth and/or tape and see if that affects a change for you.
for no particular reason, i'm thinking egr system. when you cleaned it, did you get that thin little port that looks like a vacuum line to the backpressure transducer (BPT). make sure it's clean and fully clear.
and the plugs, what condition were they? and was there oil in the sparkplug tubes? and the ignition wire set, sounds a bit shoddy(?). definitely suggest a quality set like oem, and if you have oil in the tubes, get the kind that has larger diameter connectors with built in seal rings to seal the oil from shorting out the plugs.
is the stuttering limited to cold or warmed-up driving? any other indicators that might point to the O2 sensor?
finally, back to the ignition, it's possible a coil or more is going. they do go defective idividually, and i've had one short, arc, intermittent (almost) nonexistent at idle but underload a real and growing problem. was able to diagnose using the darkofnight trick and use of cheapo ignition short tester from bigboxstore. also used an inductive timing light to spot intermittent firing. each coil fires two cylinders, the #'s are marked on the coil terminals.
finally2, on the fuel front, check the fuel pressure regulator. one easy check is to pull the vacuum hose off, if there is fuel in there at that port, then the fuel pressure regulator needs replacing.
//bc