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I had a simlar problem as below ( boost spiking), it went away when I replaced my boost pressure sensors and found a few leaks in my vaccum hoses ( i figured the boost pressure sensors were not detecitng boost and was going insane)
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Does the T7 safe boost ( like 3-7psi ever kick in on you?)
Hello all,
I have a 99 9-5, SQR tuned stage 4. TD-04, 3" downpipe, FMIC, and all the goodies. Now my question, this only happens on the 3rd to 4th gear shift, but if i run 3rd gear up to almost redline, and shift quickly to 4th, i see a monster sized boost spike. This is 25-30psi and then it backs way off and drops to base boost, and slowly builds pressure back up. Normally I see about 15-17 psi hold strong in all gears, and maybe an 18-19psi spike in the higher gear shifts. It seems like it hits a "safety net" and brings it back to reasonable levels, and then a couple good adaptation pulls and all is well and back to normal, after running really slow for a while until adapted.
When it does hit that "cut" or whatever point it is that it pulls boost way back, the car shoots unburned gas out the exhaust. A friend of mine was following one day, and had to use his windsheild wipers when it happened
If only the exhaust was hot enough to ignite it.
I have tried a new BPC, countless ECU resets, cleaned the air intake temp sensor, cleaned both MAP sensors, swapped the two map sensors, checked and replaced all vacuum lines (a preventative thing also), cleaned and lubed the forge bypass valve, cleaned the MAF, tightened the downpipe to turbo nuts (which were slightly loose), ran some fuel injector cleaner and still cant figure it out. No CEL's either. I have been tuned for a long while now, at least a year and a half, so it is not the tune. this has been a fairly recent thing, like the last month or so.
If anyone has any insight on this, please let me know.
posted by 155.94.62...
, Sat, 13 Oct 2007 21:13:43
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