still running poorly

[patgizz]

this is a continuation of my other post about code 13.

my car is running sluggish(very), very close to stalling idling in gear. extremely slow, feels like a 2.8.

i replaced the o2 sensor - car still ran poorly
replaced fuel filter - no change
tested fuel pressure - 43+ psi at all rpm, hot, cold, under load, no load, driving. never below 43psi.
replaced coil packs and module - no change
checked plug wires for damage and arcing, no problems(less than 4k on those and plugs)
removed cat, not clogged and no change.

where do i go next? ohm out all the injectors?

[ryan.hess]

Does it sound like it's missing on one cylinder? Or is it just rough in general?

[ryan.hess]

okay, just read your other post... Try this just for the hell of it... Take a jumper cable, and run it from a good place on the engine to the minus(-) terminal of the battery. Maybe all your grounds rotted away... Also might want to try that with the o2 sensor - sometimes with a bad connection between it and the manifold, it "floats" around the .5v reference the ECM sends it.

[4spdz34]

yes ohm out the injectors. 43 psi sounds a lil high for when the car is running. key on engine off it should be 41-47 psi. check it that way and check if u have vacuum to your fpr, or if there is gas on the vacuum side of the fpr

[patgizz]

i cant get a miss from any cylinder, its just rough in general. the grounds are definitely good, i have more ground straps added and nothing on my car is rotted away(never sees winter or rain, you can eat off the underside)

its raining today, i will ohm the injectors and check the vacuum line for the regulator tomorrow or later if it clears up.

[Dave]

when the car is running, try pulling each plug wire off one at a time, a simple balance test may help figure out which cylinder (if any) is the cause of the problem, sometimes that can be truly helpful.

--Dave.

[patgizz]

well. i pulled my plenum. all was well with gaskets, pcv, vac hoses, etc. injectors all ohm 12-13. however the back plugs looked kinda shitty. 4k miles on em. i heard a couple yrs ago that bosch platinums + 3.4's didnt work right but i put em in before i heard that and forgot what was in there(shows ya how much i drive the car). i put in 6 new AC plugs and it seems better, i was able to go out and spin the tires. its sluggish a little down low but i've yet to put the exhaust + cat back on. i would expect this from running the downpipe and nothing else. i need to go get a band clamp to put the converter back on from where i sawed the pipe behind it, then i can get an accurate ass-dyno test and make sure its all good.

[patgizz]

spark plugs wasnt it either. no idea what it can be. i'm tempted to fix it and sell it.

[CurtsLuminaZ34]

Two things I would check your cam timing to see if it may have jumped (tensioner
troubles) and 2)- is the ECM well grounded and check it to see if moisture got in the connectors or ECM itself. I would bank on either one of these at this point.

[RednBlack]

Whoa! Dave! Never do a balance on modern ECMs! Never pull a plug wire while running. Get a cheap plug wire analysis tool. This technique used to work with points. Not anymore.

[Dave]

.. it's worked for me pleanty of times with no troubles.

--Dave.