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Turbo still bucking after.... (long)
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Posted by Back2Saab [Email] (more from Back2Saab) on Fri, 7 Oct 2011 10:25:49 Share Post by Email
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Hello, I posted a few weeks ago looking for suggestions on how to solve my turbo engine "bucking" and hestitaion issue. I have a 1999 Saab 9-3 Base 5 speed.

After the car through a P0106 code I brought the car back to the shop thinking that maybe the new MAf installed in March had gone south.

My mechanic said the MAF was okay but said that my wastegate, and Boost Control valve were bad and were causing the bucking and CEL.

I purchased a Maptum Wastegate, and a new Boost control valve and my mechanic replaced the MAF with a new one-to support the cause.

Well the next day the engine is still bucking and cutting out. The RPM does not go down but the Turbo needle dips off the white zone and jumps back up. If I am not in gear or shifting when this takes place the turbo needle wiggles quickly back and forth from the left of the white zone and then back to idle regular idle position. Though I am now longer stalling at stoplights the idle is lumpy pretty randomly. When I get gas or how long the car has been driven seem to have no effect on when this happens. I can drive 60miles with out an issue or 30 feet from my driveway before this starts happening.

I have searched the archives and I think my next steps may be the Evap. Purge Valve, AIC, throttle body, or ignition switch? Do any of these things like possible causes?

I have replaced the following items
Blow Off Valve (Forge)
Wastegate (Maptum)
DIC
NGK plugs #BCPR7ES Stock #6282
CPS
MAF
Fuel Pump
Fuel Filter
VAC lines and other turbo hoses
TPS
I have checked and re-checked for vac leaks.

TIA!!

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