'Cough'

[DCEPTCN]

I am growing to hate this car. 300 miles on the rebuild and now I'm finding that it still has one of the same problems as before. About 50% of the time when I get up to 10 or more lbs. of boost, the whole engine will stutter and make this awful 'coughing' noise. That's really the only way that I can describe it. It has new plugs and decent gas in it....what the heck is this POS car doing? Any insight on this manner would be appreciated.

 

[TurboShane]

I don't know but I would check the MAF for sure, double check the grounds and the coil pack could be your problem.

 

[NC87GN]

Couple of things to look at..
1. Coil pack gone
2. Ignition module
3. Cam sensor 180 out
4. Hoses may have hidden crack going IC or up-pipe

I never liked the red's 93 chip but this is my opinion only. Try getting a good chip taylored for your combo (turbotweak).

HTH

Mike Banas

 

[DCEPTCN]

Would the coil pack really not give alot of evidence of being bad until that far into the throttle? How does one check the coilpack?

 

[gofstbuick]

There is a resistance check for the primary and secondary sides of the coil. Unfortunately, your problem is happening under load and boost (so it may not be visible using a DVOM), but may be worth a try to check. What kind of plugs are you running? Sometimes the platinum plugs may not fire correctly under load. You should also recheck your cam sensor (and correct position). I think NAPA sell the tops only. I had a sputtering cough problem from a loose connection at the fuel pump. I know it's a pain, but you may try dropping the tank to insure that the connector is solidly connected. Also, as stated, any air leaks beyond the MAF may cause you problems, but I think it would happen all the time.