boost falls hard then bounces back

2000excursion · #1 (**permalink**) 04-16-2009, 04:05 PM

When I step on it it will build boost till 15psi then fall to 7 and climb back up again? normal?

**jbeasts10** · #2 (**permalink**) 04-16-2009, 04:38 PM

It doesnt sound normal.The #'s sound low to me.Have you checked for a boost leak?
Also,post what mods you have done to the vehicle.

CSIPSD · #3 (**permalink**) 04-16-2009, 04:49 PM

Sounds like you have a blown or torn boot.

**Jake** · #4 (**permalink**) 04-16-2009, 05:01 PM

Definitely not normal. You should be able to see around 15 stock. And it shouldn't fluctuate. +1 on checkin your boots.

2000excursion · #5 (**permalink**) 04-17-2009, 10:13 AM

thing is that with wastegate unhooked I can build 28psi....also it seems to build boost steady at 1/2 to 3/4 but when I step on it more then that it will do the boost drop.

2000excursion · #6 (**permalink**) 04-18-2009, 09:40 AM

it seems to be throttle position related? Im not sure if the TPS Sensor would create boost to fall off but not rpms?

**Jake** · #7 (**permalink**) 04-19-2009, 05:58 PM

Hm, not really sure at this point. Have you had it scanned for codes?

2000excursion · #8 (**permalink**) 04-20-2009, 05:39 AM

I have scanned for codes and nothing comes up that is a serious code....

p0683
p1211
p0478
p0238

2000excursion · #9 (**permalink**) 04-20-2009, 05:54 AM

also pulled these codes after running open wastegate line which I was overboosting.

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