This is a continueation of a old thread Misfire under boost

Since then I have had brand new injectors put in and replaced my fuel filter & coils with MSD replacements & NGK TR 55s @ .055". The car feels nice and smooth till about 5psi and then some missing starts to take place. Not sure if the boost has much to do with it but it happens about the same time.

Just alittle bit ago I pulled my wires and checked the resistance of each one. Then I pulled my coils off and clean the primary hookups and then put some dielectric grease on there and on each tower on the coils and end of each plug.

I go for a drive, gently working into alittle more throttle at a time. I'm on the freeway doing about 60-65mph and decide to go to WOT... Transmission down shifts and for a split second starts to pull and then the power just falls off completly. I instanly get out of that gas once I felt the loss in power. The motor didn't stall out but it felt like it very well could have. Right after this the motor is running smooth, quiet & I figure it was time to ease her home and jump on BC.

WIRE RESISTANCE (per advice of willwren)
1: 45 ohms
3: 70 ohms
5: 136 ohms
2: 84 ohms
4: 135 ohms
6: 153 ohms


Time for a beer.

Ed

Ed...have another beer.

Any issues you see are going to seem worse on boost. Which pulley are you running?

I've got a 3.4" on there

Seems like we are missing something that is the problem. Can you ohm your coils and make sure they are good.

They are brand new MSD coils....But if you would like me to I can run outside and check

Unless this is a sensor or something...I'm starting to run out of possibilities

hmm; it'* not set in stone but it looks like Corvettecrazy and me might meet on Saturday and we'll see what we can figure out with his scanner.

I'd like you to try the boost bypass trick. I suspect your PCM may be trying to dump boost due to KR. That pulley seems a wee bit on the small side for a drop-in K&N.

Is this what you would like me to try?


The idea of no boost bypass scares me but you know your stuff so I'll go with it if that link is what your speakin of.

Correct. Only as a test. There is a risk running that way long-term. I just want to see if it'* the PCM commanding a boost dump. If it is, we'll have to get a scan to see why for sure.

All we're doing is removing the PCM'* ability to dump for a little troubleshooting.