Few weeks ago on the way to the g/fs my car randomly started running like a bag of ****
Stuttering, jerking, wouldn't accelerate, costing in neutral the car was fine, would not take any load without the car running like ****, pull over turn it off, turn it back on car runs fine.

Scanned the codes today at partsource

Found 2 p0106
And a p0101 in the history

P0106 says something about the manifold absolute pressure
And iirc the p0101 has something to
Do with the maf?

Any idea what would cause this? And does
Anyone know if it'll be covered under the power train warranty ?

Check engine light has since gone off, brought it to 2 dealerships, neither can find the issue or the codes in the history. They also cannot figure out what's up with the car.

This issue happens totally randomly has happened 4 times in one day and has been 2 weeks ago since it happened last, but it happened again today.

Afrs at idle are about 9.5-10 when this **** happens
Car will boost to 40kpa
Stuttering, jerking under acceleration
Backfiring on decel( once and a while)

Problem will last about ten mins then car
Will go back to normal

One dealer I went to check a whole
Bunch o ****, he checked the map sensor, checked for oil in the intake mani, checked the charge pipes for looseness, check the wastegate control solenoid for cracked nipple. All ok, Cleaned the maf and reinstalled, no broken wires.

Like I said I replaced the maf n the **** happened again today

So what in the **** is happening to my car... N how can I fix it

Any ideas?

 

p0101 is almost always a boost leak, even though it says maf. P0106 is a map sensor. Try cleaning your upper and lower map sensors, and your maf. Electronics parts cleaner will work. And check for boost leaks, look at the charge piping and intercooler end tanks for cracks.

 

Sounds like one of your map sensors is getting a bit temperamental and/or like tommy said.... you can have a boost leak as well.

Even though the tech may have visually inspected everything, that really proves nothing unless he performed a performance tests the sensors with the tech2 device and boost leak tested the system. He will need to road test the car in order to do a performance test on the sensors to make sure the map is relaying the an accurate and correct voltage back to the ecm as a boost referance signal converted from a mechanical psi. HOPEFULLY you/he can get the car to act up when he brings it for a road test, and HOPEFULLY he knows what the correct scaling of the map sensor is, otherwise he's just going to shrug his shoulders at you again.. lol

If that's the case, just go to a different dealer.

 

Second dealership I went to had a local reputable cobalt guy inspect the car

And to get the car to act up while the techs on a road test would be a miracle, there's no rhyme or reason I can't think of to get the car to act up it
Just randomly does n it's only for a few minutes, like I said one day I had the problem 4x in one day and then I haven't had the problem for a few weeks now...

And why or how would a boost leak make this problem appear and disappear so randomly?

 

The boost leak test is just part of the diagnostic procedure when you have a maf and/or map discrepancy.

 

How do u performe a boost leak test?

 

Where's SSlobalt when you need him?!?

Instead of explaining it, here's a link to a good writeup that SSlobalt did a little while back.
https://www.cobaltss.net/forums/how-...ss-lnf-223319/

My tester is very different from his, but it's the same exact principle either way.

 

The problem with having both codes P0101 set for the MAF and P0106 set for the MAP (the one in the intake manifold) is that both codes rely on each other as a check for pass/fail. Most people will blame the MAF however I've seen very few failures of these card style MAFs. Most of them were related to foreign debris more than anything else.

I had a similar situation. Random loss of power with no check engine light and stored codes P0101, P0106 or both. Ended up being the MAP sensor in the intake manifold. I put that on as a first guess since the problem was so sporatic that was the only way to narrow it down. Haven't had the problem again in almost a year.

So just to note: Check your intercooler to make sure your right tank isn't cracked/blown out. If you find no problems there, I'd start with a MAP sensor.

 

Can u buy the gms1 maps separate?

 

Hense the map performance test and boost leak test.. lol

 

If you would like for me to follow up on this with either of your dealerships, please send me a private message with more information (including the last 8 digits of your VIN, your name and contact information, and the name of your involved dealerships).

Regards,
Sarah
GM Customer Service

 

Sarah the last dealership Chris went to, is a very good dealership up here in Canaduh with a very good service department and excellent techs.

DI coking of the valves is an industry wide issue, and most likely the problem here.

However as long as Chris has warranty they will look after it and there is no point in USA customer service stirring it up, as the dealership is obliged to do all they can to rectify BEFORE going to the expense of removing the cylinder head and going that route.

And Chris has no non- GM powertrain engine mods so no need to worry there, but thanks for offering to help.

BMW MB Toyota and Audi dont remove the head for these issues btw, they have a different service procedure.

 

Yes, I got a bunch in stock. The maps compare values to each other, but generally speaking dont fail unless there is a sudden overboost situation, which afaik has not happened to you.
Let warranty take care of it, no need to spend your money when the tech and service department you are going to has the tools tech support from GM and the expertise to fix it.

 

True, I want this fixed before I do any of that lol

 

 

I have been having almost the exact thing happening. Sometimes everything is fine, some other time it runs like crap, no boost or nothing above 3-4 PSI, no power, lots of bypass valve flutter... Cel comes on for a few days, kind of randomly, then goes away... Think this kind of isse will be coreved by my 5 yrs 100 000 miles engine / powertrain warranty?

 

 

If its the valves then yes it will be covered under powertrain