Car sputters/feels like fuel cut when building boost

Talontsi37 · Jul 16, 2010

Another update. I wired in the boost solenoid, fuel pressure solenoid, and swapped out the injector resistor pack with a different one. I know the 2 solenoids work cause I tested them with DSM logger. And once again car still does the same thing. I took the car up to 7000 rpms slowly and it will go that high but if I try to accelerate too quickly it cuts out. I almost wonder if it has to do with airflow, maybe Ive had 2 bad air mafs.

What do you guys think?

Talontsi37 · Jul 18, 2010

*****Problem solved******

Well I decided to check the wiring one at a time by checking for continuity. I started with the air maf since I suspected it might be the problem. Since I had the pinouts for the stock maf and the ecu, I checked them one by one. When I got to the idle switch(yes there is one in the maf) it was open(meaning no continuity). I was happy cause I guessed this might be the problem. So I wired in a new wire, it checked out ok, started the car revved it and it WORKED!!!!! So I went and drove it and its running like a champ. So apparently this wire is very important, but oddly not important enough to throw a code. This wire tells the ecu that the car is not idling anymore, hence why my car would not boost, the ecu still thought the car was idling and would cut the fuel. So thanks for all the help guys! I am very glad I found the problem.

bertrenolds5 · Jul 18, 2010

Glad to hear you figured it out, now wait another week or two and another problem should arise considering it's a DSM.

Tito97GS-T · Jul 18, 2010

Bro my car does this same exact problem but, I don't understand it with deep details like you do. I tried alot of things and nothing worked and I am no tech honestly. I know a few things here and there but, when it comes to wiring stuff and figuring out issues like this i'm lost. Nice!

8ursrt4 · Jul 19, 2010

hey how far back did you check? This sounds kind of like my problem. I think im gonna try from the ecu plug to all the pins on the maf. Which color wire was it?

Talontsi37 · Jul 20, 2010

8ursrt4 said:
hey how far back did you check? This sounds kind of like my problem. I think im gonna try from the ecu plug to all the pins on the maf. Which color wire was it?

I checked from the ecu plug to the maf plug.
Use this for the maf:
http://www.vfaq.com/mods/2GMAF-1G.html

and this for the ecu:
http://www.vfaq.com/mods/ecu-harness-1G.html

BmxJacob · Jul 21, 2010

try turning the boost down all the way then slowly build it back up until it runs like you want it without stuttering

Car sputters/feels like fuel cut when building boost

Talontsi37

Talontsi37

bertrenolds5

Tito97GS-T

8ursrt4

Talontsi37

BmxJacob

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