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Engine Running Rough
Ok so obviously with an old car there is many things that can go wrong and without actually seeing the vehicle or being there to diagnose it it's almost impossible to say whats wrong. That's a given so with that behind us what's the most likely problem?
Model: 6S (3.0L, V6)
Recently the catalytic converter has gone in bank 2(P0400, P0401).
I have replaced all the spark plugs and coil packs(all new)
4 wires in the fusebox have been rewired (spliced together and heat shrink over to waterproof, this did contain the largest wire gauge in the boxes white connector and the ground wire.)
In the past IPC, ABS, and TCM could light up all together when the weather was humid and the car would run like sh*t.
PCV Valve was just changed < 5 mi (10 kilometers)
Engine and transmission oil/filter were changed today (0k)
Both Tensioners and drive belts (Water pump and ac) replaced <10K
Brake pads and rotors were upgraded to performance parts.
Vehicle is STILL running roughly. After codes for Cylinder 5, 6, and 3 misfire came up, Replaced all the spark plugs and coil packs as well as the intake manifold gasket. Cylinder 5 and 6 no error codes after. After about 2 to 3 weeks cylinder 3 had another misfire and ran like sh*t again. The more humid, the worse it runs. A tech said it could be a possible vac leak (if so, how could I test this to confirm or deny?) tested vehicle in drive and elevating rpm to about 1500 while brake applied. This is when cylinder 3 appeared to fail and all spark plugs and coil packs were replaced.
Bank 2 Cat is done (temp below threshold)
Wire was found near the rad (loose and unconnected). It was in a somewhat triangular form and was a rubber orange piece. (see pic1 and 2) Is this supposed to be connected anywhere? There did not appear to be any connecting pins inside the piece. Where a pin should have been appeared to be sealed rubber. Zip tied it out of the way so as to not get caught in rad fan.
Lastly there is a ticking sound while the engine is running. Louder or more noticeable in drive as it's almost constant, however in neutral or park it's only slightly noticeable with slightly elevated rpm (near 1500 instead of idle). Have heard it here and there at highway speeds but very subtle. One tech said possible rad fan, however with the cat gone on bank 2 could it possibly be that?
- I am aware that the cat being gone and possibly plugged can damage the engine and am working on getting a new cat.
PLEASE NOTE ONLY CODES PRESENT ARE FOR THE CAT. ONE GENERIC AND ONE SPECIFIC FOR BANK 2. CYLINDER 3 MISFIRE ONLY APPEARS WHEN HUMID OUT.
If any more info is needed or more specific details are needed, please don't hesitate to ask. I'm glad to take more pictures or videos if needed or provide more info. I am completly open to all ideas even ones I've tried. Even if it sounds stupid, it could be something, weirder things have happened.
Last edited by TheNexusElement; 08-18-2016 at 06:54 PM.