Misfiring help

[mcdow991]

Misfiring help

I need help. I have a 1991 Nissan Skyline R32 GTR, I recently had it in the shop getting intercooler piping, new ECU HKS Fcon V pro and a tune. Got 579 to the wheels and was running great for about a week. Then one morning woke up and it sounded like a Subaru and it blows smoke out the exhaust. Did some trouble shooting and found that when I unplugged number 2 and 4 coil pack the engine idle didn't change. red out the coil packs and checked the plugs, all good. even swapped coils around with no change. The plugs are wet with gas so I did a old school spark test in the block and getting spark.  ordered new coil pack wire harness and still no change. swapped out the PTU(coil ignitor unit) with a known good one and still no change. Did the self diagnosis and got code 21, Could it be the tune is causing this, I mean it just started one morning when I started the car and it ran fine the night before. Thanks.

Mods on the car

1.2mm aluminum head gasket

tomei pons cams

tomei m8270 turbos

HKS intercooler piping

HKS boost controller

HKS Fcon pro v(no MAF's)

nismo 600cc injectors

walbro fuel pump

full 3in exhaust w/cat delete

 

 

 

 

 

 

[Ed.williams5]

Did you check to make sure your CAS is firing all 6 cylinders? May have a dead spot on it. Correct me if I'm wrong but firing order is 1-5 3-6 2-4, so the fact that 2 and 4 are wet would make me lean towards a bad cam angle sensor

Edited December 21, 2016 by Ed.williams5

[mcdow991]

I checked the connection but that was all. Ill have to read it out. Thanks. 

[mcdow991]

Ok so new problem. I was going to take the car in to my mechanic and it wouldn't start. First time turned over and backfired,  after that just cranking, a little bit of sputtering like its going to start but nothing. funny thing is it started the day before no issues, besides rough idle due to my misfire. I didnt drive it, just started it and to go to the store then decide against it. Any ideas? I dont want to pay for a 22km tow bill. 

[Ed.williams5]

Did you pull your CAS off and spin it with the key on and plug still connected to make sure all injectors are firing?

Edited December 29, 2016 by Ed.williams5

[mcdow991]

Not yet, was afraid it would mess wuth my timing, but now that it wont start im going to try that. Thanks. 

[Ed.williams5]

On 12/29/2016 at 0:44 AM, mcdow991 said:

Not yet, was afraid it would mess wuth my timing, but now that it wont start im going to try that. Thanks. 

Before you pull it just take a sharpie and put reference marks so when you put it back you no exactly where it was.

[mcdow991]

So I took my car to my mechanic and found out I have no compression in my number 2 cylender,  and my pistons are burnt on the exhaust side. Worst case senerio.  He believes that maybe the turbos, I have Tomei m7960. He said that he has other cars blow the bottom end using the same turbos.  Anyone else have any issues with them?