Question about 1997 Saab 900

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94 saab 900 turbo - boost bucking

My saab when accelerating into the yellow, starts to bog or buck and not go any faster until i let off the gas and bring it back down to normal range. I first tried going to our local salvage yard where they have alot of saabs. Bought a new used wastegate and APC solenoid. Still has this problem. What is the possibility of those being bad also? Is there a definate way of telling exactly if it is the wastegate of apc solenoid? I can pull the wastegate actuator arm out by hand... please HELP!!!

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  • Saab Master
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Leave the rubber vac pipe off and try that?

Posted on Jun 21, 2009

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Posted on Jan 02, 2017

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Where is the cruise control fuse on 2006 saab 9-3



NOT EXACTLY WHAT YOU ASKED BUT VALUABLE INFO I THINK YOU'LL AGREE?


There are several common cruise control failures on Saabs. The pedal switch failures are the most common problem. What generally occurs is that the pedal switches become mis-adjusted or the ears get broken off the switches causing a no contact condition. Another common problem is that the cruise vacuum hose leading from the vacuum pump under the false bulkhead begins to crack where the vacuum fitting is located at the firewall.. The third most common failure is an intermittent functioning cruise control module. This can often be identified by noting that the cruise will work intermittently (900 & 9000 only).

Another Issue: On turbo models, there is a vacuum controlled switch, located near the pump (red cap) that cuts the signal to the APC solenoid valve when the cruise control is on (switch opens). If the switch is faulty (I broke mine on rough road), it can keep turbo boost at the "basic" level even if the cruise is turned off. The APC boost gauge will only go half-way into the yellow region, and performance will suffer. Either replace the vacuum controlled switch or pull the pigtail connector below the switch and short the ends of the yellow/white wire going to the APC solenoid valve and
proper turbo boost should return. Be aware that if this second fix is employed, your turbo is not limited in boost when in cruise control.

Sep 13, 2012 | 2006 Saab 9-3 2.0T

1 Answer

1993 civic bogs when acceleratoring


I'd replace the fuel filter. It's easiest if you use a toggle joint adapter with your socket and ratchet.

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1 Answer

Problems w/ 96 saab 900 se turbo


have you oil in the water? (radiater) if so you head gasket has gone and will nd replacing (big bucks) having a mix of water and oil gives you the sludge build up continuous over heating will certainly warp your head check your oil dipstick for a milky sludge instead of just oil

May 20, 2009 | 1996 Saab 900

1 Answer

SAAB 900 1988


Your problem with the APC system. Any perceived fault and you only get base boost. The most likely fault is the boost pressure sensor located under the dash on the left-hand side. when it is bad you often hear the APC solenoid valve clicking at idle.

Mar 10, 2009 | 1990 Saab 900 Hatchback

1 Answer

1992 Saab 900 LPT Uprated to FPT


blue smoke is oil burning if it does this on idle good chance turbo needs a rebuild if the car is over boosting the car will pull back poss back fire u need to make sure base boost was set correctly

Jan 30, 2009 | 1987 Saab 900

1 Answer

Dodge daytona shelby z turbo buck and hesitates when you punch it


you may be going into over boost at which the computer cuts the fuel check out dawes devices .com they make an over boost eliminator for like 40 bucks

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1 Answer

APC Solenoid Valve Knocking


The APC valve regulates boost pressure (via the wastegate) to avoid over-pressurising the engine. It ensures that a safe boost pressure isn't exceeded. Don't run with it disconnected or you risk blowing the engine!

Problem areas can include: knock sensor on the engine block (also poor quality fuel, dirty engine causing knock); engine ECU.

You need to provide more information about when this happens:

hard accelerating? (likely poor quality fuel, dirty plugs/engine causing knock) and general driving similar.

idling? possibly a knock sensor or ECU related problem

What rpm? what boost gauge pressure?

as an outside chance, maybe a sticky wastegate

Saabreur

Nov 12, 2008 | 1992 Saab 900

2 Answers

Saab 9-3 turbo problem!


Sounds like the recirculation valve (aka diverter valve) is failing. A lot of turbo cars that have them end up with failures from them, since they're usually cheaply made from plastic, and the diaphragms inside don't hold up over time.

What the valve does is, when you shift, there is a backsurge of boost air that hits the closed throttle plate. The diverter valve (DV) opens and dumps the air back into the intake piping. It's kept closed during acceleration by spring and manifold pressure. When you shift, the pressure drops on the backside of the valve and it opens, venting the excess boost air. If your valve is failing, just the pressure of boost in the intake piping could be pushing it open, causing the acceleration to slow. I'd look into a replacement diverter/recirculation valve.

Jul 31, 2008 | 1995 Saab 900

1 Answer

1.8 turbo in (2003 jetta wagon) accelerating problem


When you open the hood of the the car have a buddy accelerate in park and listen for a vacuum leak this is the likely cause it sounds lik your loosing boos pressure. Also, get a tune up there maybe a list of problems. Hopefully it's not your transmission!

Jun 02, 2008 | 2003 Volkswagen Jetta TDI

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