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blows acceleration pt cruiser gt when gas fully open

 
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Old 25 Sep 2012, 03:11 pm
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Angry blows acceleration pt cruiser gt when gas fully open

Hello everyone,

sorry for my english, i'm French

So i have a problem on my GT 2005: when i accelerate fully, in first and second spped it's great, but in 3 /4 /5 there is a problem: the motors have blows. If i accelerate medium or less it's good, but if I crush tghe pedal, blows and little explosion....

No error codes, i have change the plugs, spark, ignition coil: nothing better.

What about??

Thanks
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Old 25 Sep 2012, 04:49 pm
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Default Re: blows acceleration pt cruiser gt when gas fully open

I'd check for vacume leaks. I'd go ahead and replace the Throttle body to hard pipe hose and check all the clamps on the inter cooler.

It sounds like you have a hose blowing lose when it tries to build boost?
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Old 26 Sep 2012, 01:00 am
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Default Re: blows acceleration pt cruiser gt when gas fully open

Thank you for your answer.

In fact it works very well in the 1st - 2nd, the turbo takes good 19 PSI (Diablo Intune) without problem.

It kidding from the 3rd ... and if I insist, it backfires
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Old 26 Sep 2012, 09:37 am
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Default Re: blows acceleration pt cruiser gt when gas fully open

It does not seem like you have a boost leak but more like you have a spark timing problem causing "backfire" back into the intake manifold. This could be because of a mechanical problem because of a slipped timing belt. But since your car starts alright and runs well in the lower gears it's probably not that. Because you mentioned you have Diablo Intune, my guess is the tune needs fixing. If you are able to upload a log to your computer, you would be able to see exactly what is happening.

Did the problem begin at the time you loaded a new tune with the Intune? Or did your car operate fine for a while and then suddenly have problems with no new changes? Did you do anything else, such as change a piece of equipment or make an adjustment, at the time when the trouble started? Did you switch to a different heat range spark plug by any chance?
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Old 26 Sep 2012, 09:43 am
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Default Re: blows acceleration pt cruiser gt when gas fully open

Hmm, maybe check the lines to the wastegate? It sounds like the ignition system is sound. So maybe the wastegate is acting up?
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Old 26 Sep 2012, 09:47 am
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Default Re: blows acceleration pt cruiser gt when gas fully open

Do you have a wideband 02 on it? If so what are your AFR's at part throttle? Should be 14.7 to 1 at PT and idle and between 11 and 12 at WOT.
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