Shiv Sikand

I was getting a serious misfire after a hot restart. Car would run terribly, and then throw misfire codes on multiple cylinders on both banks. Shut off and restart would solve it, and no misfire at speed or WOT. Started to do it more often. Bought 2 coil packs wholesale from the dealer for around 1K each, plus the plugs and car is like new again. Good color on plugs
New coil packs installed
Drivers side was harder than passenger side

Shiv Sikand

My codes from STAR

tusabes

Awesome pictures , thanks for posting this !
Did you consider changing the ignition transformer too ?

Shiv Sikand

From what I've read, the ignition module failure causes a misfire on every cylinder in a bank. It also throws a specifc code. So at this time I'm not going to replace it unless I get additional misfire issues.

g60wall

I had same issue, replaced coil packs and plugs. Still misfired on hot start, changed voltage converter everything has been perfect since. I'm looking at retrofitting heat sinks to voltage converter

g60wall

The build date on my voltage converter was 37w11, my new one from amazon 47w16

Shiv Sikand

Thanks for that info. I will report back if the misfire returns.

Shiv Sikand

What did your misfire codes look like?

g60wall

i continued down this rabbit hole. My hot start misfire would only happen on cylinder 1 and 7 sometimes 9 or 8. The voltage converter didn't solve it. It seems to be a vapor lock issue in the fuel rail. Some early bi-turbo cars have a 4 bar fuel pump control unit this isn't strong enough to fill the fuel rail up when then the ethanol has boiled off and vapor locking the fuel rail. I orderd the 5 bAr control unit and will be swapping on asap.

tusabes

Please let us know if the 5 bar fixes it

g60wall

Yea I will report back asap

Shiv Sikand

Car is running perfectly.

g60wall

100 percent fixed my issue!

mskimd

Sorry. Posted on the wrong thread and I can’t find how to delete. I don’t mean to hijack this thread.

Does any one know if there is known range of defective engine #’s to look up? If so where can I find those?
thanks,

Martin

MrTracy

Tell me more about this "Some early bi-turbo cars have a 4 bar fuel pump control unit" I seem to get this random cylinder misfires; its happened twice. I shut off the car and clear the codes and I'm off again with no problem. It just happened twice so far. Do you have an item number or pic?

tusabes

Yes I’m interested in the 5 bar part number too