Pop N Wood

iTrader: (1)

Mixing up the firing order will make a car run like that.

Take a non-contact thermometer and check the temp of each exhaust port when the car is running. See if any of the cylinders are not firing.

boogiewonderland

make sure your power wire goes directly to battery get a good ground on the frame check for vaccum leaks and make sure you have good fuel pressure.

brandonconner

ok...so we pulled the plugs and it gets even more odd. One side of the motor, the plugs look like they are all firing perfect, good color and do not look fouled. The other side of the motor looks like they have not been firing at all. Would it be possible that all 4 coil packs are bad? I'm thinking no, but is there some other explanation such as a ground wire for that bank that is somehow missing? We had the coilpacks off when we installed the intake, but everything is plugged in and there does not appear to be any wires missing or pins in the connectors that are bent. Anyone seen anything like this before?

Paul57

Sounds like you may have a bad box. Maybe MSD will let you swap it for a 6010?? That way you can use pills or program it. You could swap wires or coils and see if the problem follows but I doubt you have 4 bad packs. There is a common fault between the 4 of them, most likely.

xpndbl3

iTrader: (23)

you can't tell by the sound of the motor that it's missing 4 cylinders? really ....?


yes the coil connector for some reason at the white connector could not be firing the entire side, perhaps a break in the wiring or missing/bad ground on that side.

The stunningman

iTrader: (47)

Swap coils around and do like he said if you don't have a thermometer use a spray bottle and some water to see which ones sizzle the water off the quickest. If the water doesn't sizzle off the cylinders not hitting.

3pedals

iTrader: (3)

unplug the main harness connector and make sure all the pins are fully inserted into the connector body. you can see if some are lower than others, and they may not be making contact.

toxic99

Is the motor reving under load, but car barely moving or is it struggling to rev under a load?

speedtigger

iTrader: (16)

Did you change the cam or timing chain?

brandonconner

So, sorry for taking so long to get the resolution up on this one but we were facing a couple of issues. First, the MSD box wiring harness had two pins reversed on the passenger side coil pack connector (the power and ground for all 4 coil packs). Once we resolved that (and yes the car would crank and idle on 4 cylinders) it turned out that the power going to the box was not sufficient to run it. Once we resolved the power issue, we verified the fuel pressure and all was good. The car now runs really well and seems to have plenty of power, even on the stock timing curve. I appreciate all of the ideas and help, this one was a pain but turned out really nice.

3pedals

iTrader: (3)

Good news