Ok so I was driving from Vermont to Boston about 3h drive. Made it there fine, halfway home in NH going like 75 on the highway my car starts having a seizure and almost stalls. Stops completely until I get into Boston. Starts coming and going. Have double at work today so all i had time to do was pull code. P0301-P0304 one for each cylinder and the multiple random cylinder misfire code 16684. It seemed like it would start happening under a load. It didnt misfire once when it idled for 30 mins today. I need to further test drive for more conditions but last night I was just happy to make it home. Under further inspection My turbo seems to be leaking oil into my elbow next to DV. Which I dont think is related unless oil fouled 02 sensor. But Im thinking its probably the ICM and after already wanting to do an icm delete I may just do that first. Im wondering if you think thats a good starting point. Edit: also my valve cover gasket is leaking since i got the car. Could be fouling my plugs, will check tomorrow but since ive had the car a year i doubt thats my problem.

 

Check the plugs for fouling but also for gap and electrode/ground condition - they can erode over time. If not, the ECM and/or the MAF would be what I'd look at.

 

Ecm is same as ecu right? If so i have a spare from when i got my tune. Is there a way to test MAF or do u just swap it and cross fingers? Even so i ordered all parts for icm delete... I was just waiting for something like this to happen. I have tomorrow off im doin valve cover gasket and checking plugs.

 

****, sorry, should've said ICM there - typo.

 

Alright i have icm delete setup comin on thursday and ill check plugs now. How do i test my maf?

 

Plugs werent terrible, went for a granny ride. No problems. Opened it up weird noises coming from turbo , and cant boost. Think my turbos done? My question is why would the turbo make me get misfires?

edit: now this is getting weird. Drove around again a few hours later. Boosting like a champ like nothing was ever wrong and no misfiring (no codes or shaking just hesitant boost earlier in the day) all day. WTF? Im getting more and more confused. Thursday will be new spark plugs, coils, coil harness (ICM delete), and valve cover gasket since they have all already been purchased. I guess I'll do this work Thursday and see what happens. Anyone have any input it would be appreciated.

 

bump it

 

switch all coil packs around. 1-2 2-3 3-4 4-1. clear and wait. if returns and has changed. coil pack. if stays the same. power control module....pcm, found on top of the airbox. looks like a black chip.

aside from that hoss id lean towards fuel problems. take injectors out of their respective cylinders and cycle ignition. while still attatched to fuel rail watch spray pattern from injectors. anything other than a fine mist? replace. if all thats fine...maf sensor can cause crazy things.

a failing turbo sounds like a damn dentist's drill. either that or mad smoke. also make a soapy water solution and spray all over the damn engine till everythings ****** soapy. look for bubbles, i.e boost leaks. good to do anyways. lol

 

Switching the coil packs around would be irrelevant at this point since I already cleared the codes yesterday and drove around all day today half beating on it and half granny shifting. No misfires or codes have returned so far. At this point I'm back to leaning towards a sensor. I will already be eliminating the ICM and changing all the coils and plugs anyway along with the icm delete harness (should be here thursday). I am just puzzled by how all symptoms seem to have disappeared.