Bucking, missing, running poorly

[captndave737]

My GN was running fine when I stopped to do some shopping. When I got back the car started fine but then kept stalling. Feathering the accellerator kept it running while I tried to limp home. The car was bucking and missing and I thought it would eventually die when it started clearing up and after about 3 or 4 minutes was running fine again.

20 min. later I stopped for about 10 min. and when I came back the problem had returned!!!! and just like the first time after 4 or 5 minutes it cleared up.

It was acting like the times in the past when the MAF had died but they never cleared up and always threw a code. No code this time.

I'm thinking maybee heat soakback was affecting something. Anyone have any ideas?

 

[turbojd]

Start the car and lightly tap the maf sensor with a screwdriver, see if this makes the car stumble or stall, if it does the maf has issues.

 

[hemi8]

Did you fix your problem? Mine did the same thing yesterday, ran fine on the way to work, went out after work and it stalled twice, I had to drive with 2 feet to keep it from stalling, after 5 miles it stopped bucking and kicking and ran fine for the next 30 miles. My WB readings bounced from 14.8 to 21.0 during the episode. Got home and checked for codes but nothing, have the LT1 MAF + translator, tapped it with a screwdriver but nothing?
Mike

 

[mrbuyit]

Running Problem

I had the smae problem once. Check all of your hoses between the turbo, intercooler, etc. I had two bad clamps that caused the hoses to leak under pressure. i bought some HD replacement clamps, which incidentally was a good excuse to by some shiny new red hoses. Installed and the problem went away. Check all your vacuum lines also.

 

[hemi8]

All is well with hoses and vacuum lines. The symptoms showed up when the engine was cold, idling and very light throttle which leads me to say no to coil pack which would show up more than likely hot running boost. Usually when the ECM craps out it kicks out a million codes and I believe when the crank sensor dies it causes a no start condition. MAF, what does a intermittant bad MAF act like?
Mike

 

[captndave737]

The problem went away and never came back! Not a clue what it was.

 

[hemi8]

New ECM and crank sensor, runs perfect.
Mike

 

[86gnminnesota]

I had the same problem, no codes and engine was stumbling/dying intermittently. ECM was bad, replaced it and no more problems.