ehall

Check the MAF sensor. Clean it and check to be sure the wire is intact.

minho78

Ehall he has the quad maf which is the one with four resistors. Now when I went to Lindsey site they talk about a .DBX file that you can change values. I would call Dave or Mike and ask if that symptom could be related to it.

Rogue_Ant

Just noticing this thread... You are hitting the DME's overboost protection.

Try lowering your boost and seeing if you get the same problem.

minho78

So Rogue you think he's running more boost than what the chips were burned for? Is he running a manual boost conroller?

Rogue_Ant

The first page he said 18psi. The short of it is yes, I think the DME is seeing more load then what the chips are burned for. However, a boost leak can artificially inflate the airflow number to the DME, causing the DME to think the load is too high, triggering overboost protection.

Adam Poland

Useful info. Yes, when I turn the boost down, it stops. The confusing part is, the car ran just fine on this exact setup (18 psi and all) for about a month and a half. Then I make one turn and it starts doing this all of a sudden? I agree 100% that the DME is hitting overboost protection, but the problem is I don't know whats causing it. Could the chip maybe have gone bad? I've checked all vacuum lines multiple times, changed out intake manifolds, silicon boots, and checked the hard pipes. Last time something like this happened I had a cracked hard pipe. I guess I could change those out and try just because.

Rogue_Ant

If the car still runs, then the chip is not bad.
Have you build an intake pressure tester?

http://www.vfaq.com/mods/ICtester.html

I'm betting you have a boost leak, which causes the DME to see too much airflow, triggering overboost...

kevincnc

Sounds like when I forgot to tighten one of my I/C pipe clamps. The pipe would pop away from the coupler under heavy boost, but press up against it and stay sealed with lower boost. I think that would make it go lean also.

Adam Poland

Wow thanks for that link. I need one of those. Im starting to think boost leak as well.

Adam Poland

Ive had the same problem before. But all of my clamps are tight. When that happened to me though, my car riched itself out and died.

turbopower

I am having the excact same problem , if you go past 11psi boost it want to shut off
replaced everything mentioned but the problem is still there

Adam Poland

I feel your pain man. Its frustrating isn't it?

Ronin-951

Hey Adam, theres a bunch of us 'Lurkers' out here in the ether that feel your pain as well. Just want to say Thank You for being so up front with the problem and the lessons that we all need to know.

turbopower

Has anybody thought about the knock sensor ?
Could a bad knock sensor could possably cause that ?

ehall

I believe it could. Always, it could be a good knock sensor cutting boost to save the engine as well.