Sputtering & Popping Problem!!

[thepremier]

I am having a problem with my 87 GN sputtering while driving. The sputtering does not start to happen until I accelorate 25+ mph. The popping will occur sometimes when at WOT, but doesn't happen all of the time.

I haven't replaced the MAF since I bought the car, and I have no idea at all how long the current MAF was on the car before I bought the car.

I also received a Malfunction Code of 42 on my Scanmaster, so I am wondering if it is a bad MAF??

If so would it just make more sense to upgrade to the LS1 Maf + Translator?

All help and information will be greatly appreciated.

Thank You

 

[Beamer]

I am having a problem with my 87 GN sputtering while driving. The sputtering does not start to happen until I accelorate 25+ mph. The popping will occur sometimes when at WOT, but doesn't happen all of the time.

I haven't replaced the MAF since I bought the car, and I have no idea at all how long the current MAF was on the car before I bought the car.

I also received a Malfunction Code of 42 on my Scanmaster, so I am wondering if it is a bad MAF??

If so would it just make more sense to upgrade to the LS1 Maf + Translator?

All help and information will be greatly appreciated.

Thank You

Copied from Malfunction Codes Reference


CODE 42

Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system.

During cranking, the timing is controlled by the ignition module while the ECM monitors the engine speed. When the engine speed exceeds 400 RPM, the ECM sends a BYPASS signal to the ignition module which switches the timing to ECM control. The ECM calculates what the timing should be then "tells" the ignition module via the EST circuit.

An open or ground in the EST circuit will stall the engine and set a Code 42. The engine can be re-started but it will run on ignition module timing.

The conditions for setting this code are:

System in BYPASS mode but the ignition module is still controlling timing

- or -
Engine speed > 600 RPM with no EST pulses (ECM controlled timing) going to the ignition module for 200 msec.



Typical causes for this code include:

1) BYPASS line is open or grounded
2) EST line is open or grounded
3) PROM or CALPACK not seated properly in the ECM
4) Poor connections between ignition module and ECM
5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise)
6) Faulty or incorrect ignition module
7) Faulty ECM



Mike

 

[510TURBO]

my friend had the same code 42

i think he said it was the cam sensor but after investigating it was the wires to the cam sensor they were melted together because i heard your car would not even start with a bad sensor so check the wiring to the sensor

 

[billhead]

sputtering and popping

I had the same code set and the ignition module was the culprit

 

[mr go fast]

I just went through this last month. I had been playing with fuel presure and idle settings when I started to miss after 15lbs of boost. The check engine light came on and it was 42. On the way home from playing with it, the car turned off many times. When I did restart it, it would severly miss. I figured it was a faulty mass air recently having the same issue months ago. This is the second mass air in the last year. I will be swaping it out with a translator hopefully next week.