Yeah, tried that one early on. Didn't see a difference.

 

maybe he'll check the leakdown , hopefully you don't have bent/pitted/burned valves. It would be good to eliminate that as a cause.

 

I hope that's not the case. Something leads me to think it's electrical though. Any mechanical problem should be consistent. Since the symptoms are not always there and would sometimes go away after I fiddled with the harnesses, I feel like it's some weird electrical gremlin.

 

A faulty/slow switching O2 sensor will cause all of this, esp running rich on a warm motor, the O2 sensor is ONLY read by the ECU when the car is in closed loop (normal operating temp), the car uses a table in the ECU to put fuel into the motor when its in Open loop (cold to normal operating temp). Also another thing that could be wrong and its more likely since you have high miles is one or more injectors are stuck open (dirty/faulty). A O2 sensor only has a life span of about 100k miles on the HIGH end, you wont always get a code if the O2 sensor is slow/bad, I normally change mine out at 75k miles on EVERY make and model car I get. On a side note has a fuel pressure test been done? This could also be a problem...

 

The shop that it's in now replaced the primary 02 sensor with no luck, the secondary is somewhat new. The injectors were all replaced a few months ago when another shop told me that they might be leaky so they're all brand new. I have not had the fuel pressure tested (at least I don't think the shop has done so).

 

Well, it finally seams to be running better. Swapping the ECU out was the last procedure. I'm picking it up from the mechanic this week if I have time and we'll see what happens in the weeks to come.

 

glad to hear!!!

 

I hope that works for you Joe, this has been quite the long process for you. Given the number of new parts on the car it should run like mint. I hope they got it right with this one.

 

any updates