Too much boost when it's cold?

[Stangfreek]

Howdy all,
Within the last few weeks my truck has been seemingly overboosting and hitting the fuel cut when accelerating hard. I say semmingly because I don't have an aftermarket gauge yet, so I'm going by feeling. The stock gauge (I know, I know) seems to jump up quickly, I get a bad stumble, then it settles down and it's fine. Now the kicker, today is the first warm day we've had here since this started. It's always been 40F or below when this has happened, and today it's around 65F. Well, today it's running perfectly and I'm not getting this seeming spike. It's strong, smooth, nice and even boost...
Has anybody ever heard of this in cold weather? I'm not sure it's a big deal, I'll just stay out of it when it's cold, but I would like to resolve the issue.

Thanks,
Jason

 

[Tydriver]

Depending on the miles and condition on the turbo I'd prolly chalk it up to experience. The OEM wastegate is miserably small and quite inefficient at regulating the CFMs. Remove the CAT and watchout.. Rumor has it, it will overboost all the time.

The fix to your issue is some type of replacement wastegate assy. Instead of spending cash on this why not try swapping on a PTE setup. You can have rock solid boost and be able to actually have the ECM control it. After all thats done you will be able switch a couple of cars around in your signature :wink:

 

[AXXE]

My did the same over boosting when I changed the exhaust and airbox. What kind of setup do you have? I installed the Ultimate and 3bar and everything is fine now.

 

[tealty]

I will almost guarantee its the stock rubber elbows on the wastegate solenoid. The solenoid is bolted onto the stock turbo compressor housing. Inspect these lines. GOTO an autoparts store and get some new elbows. I bet they are dry rotted and cracked at the 90* bends.
later
Jordan

 

[Tooky]

On my truck, the fix would be to loosen (lengthen) the wastegate rod one half of a turn. Yours may be the same.

 

[manitoufs]

Are you getting a "Check Engine" light? If you do, your setting a code. Before you do any rod adjusting, check your boost control circuitry for vacuum leaks. Like Tealty says, the biggest offenders are the soft rubber elbows around the boost control solenoid.

Replacements (not direct but usable) are available at Pep Boys etc.