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I have a 98 gtp. For some reason the vacuum boost valve is stuck on open wen motor is running. Its suppose to b close right unless wen im giving it gas... Wat do I do to fix the problem... An will I get the whine bac if valve is workin right...?

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  • 14 Answers

Replace the valve.

Posted on Jul 22, 2013

  • Andre kendall Jul 22, 2013

    Thanks for the help... It ment a lot

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check to see that you have fuel all the way to the engine.to do this: pull the fuel pump fuse and, crank the engine a few times to releive pressure then open the fuel line, cover it with a rag for safety then: replace the fuse and, crank the engine just for a second or, two if no fuel comes out it's another fuel filter probably on the truck frame rail that is the problem or, low pressure from the fuel pump

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SOURCE: 2007 dodge ram hemi whining noise from under hood

Inspect the belts for any carbon build up (It will look like specs of glassy residue), cracking, or for proper tension. If it tends to go away at a certain rpm or after a bit of driving I'd say it's definitly a belt.

You could try to figure out what belt it is by sitting in your driveway and idling while you turn the wheels (Powersteering belt) or turn on the A/C (A/C belt). Do you notice any lose of power? This could point to the main belt that winds its way around most of the engine.

Hope this helps!

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mlapres
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SOURCE: supercharger troubleshooting????

Check for a vacuum leak from the inlet and outlet hoses on the boost bypass valve and especially the boost solenoid.

Posted on Mar 16, 2010

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I got a 2000 pontiac grand prix gtp the car runs well but the boost level will not go more than 1/4 on the gauge, one mecanic said to change the spark plugs because they are 4 or 5 years old (iridim...


The spark plugs have absolutely nothing at all whatsoever to do with boost levels.

However; change them anyway because new plugs are always better. In the GTP, don't use the iridium plugs, use copper core. I highly recommend Autolite 605's, gap them to .055"

In the GTP, spark knock is a common, performance robbing issue because of the supercharging. You'll lose 5-6 horsepower for every degree of timing ****** that the engine computer will employ to prevent the spark knock. If you use copper core plugs though, this problem will be less likely because copper dissipates the residual heat much faster than iridium, so that only the electrode spark alone can be hot enough to ignite the fuel. The only other difference between the plug types is how long they last. Iridium plugs were the originals only because they last longer...they offer no performance benefit to the GTP.

Now on to your actual question.

There only a few causes for loss of boost pressure in the GTP, all of which are an easy fix.

Supercharger belt slip, disconnected or damaged boost bypass valve hoses, or maladjusted boost bypass valve linkage.

The easiest thing to do first is the boost bypass valve adjustment. This will produce results even if you DO still have belt slip or a leaking hose.

Locate your boost bypass valve. You will find it mounted directly in front of where the throttle body bolts into the intake plenum.
You will see that it is held in place by three bolts. Loosen them in this order; left, right and rear. You will find that you'll need a 4" extension socket to reach the rear one. Hold your socket on that one while you push down on the valve body. As you may notice the mounting bolt holes are elliptical, allowing for the height adjustment. You can use this as a visual reference for how far to push the valve down. You shouldn't push it down all the way, only about a half an inch will suffice.

What the adjustment does is reduces the amount of throttle opening needed to produce boost, by shortening the travel length of the valve lever that is attached to the throttle. When properly set, it will allow about 11 to 11.5 PSI at wide open throttle, or just short of wide open throttle. In any circumstance you may also notice that your GTP is a little quicker from a standing start after the adjustment.

Jun 26, 2011 | 2000 Pontiac Grand Prix

1 Answer

I have a 2002 Pontiac GTP.I have noticed today on the Interstate that the booster is not performing when i give gas to pass somebody,any idea what the problem could be?


SCAN VECHICLE FOR ANY SUPERCHARGER BOOST SOLENOID FAULT CODES.AND CHECK FOR LOOSE OR BROKEN VACUUM LINES GOING TO SUPERCHARGER BOOST SOLENOID THAT WILL CAUSE NO BOOST PROBLEMS.

Oct 06, 2010 | 2002 Pontiac Grand Prix

1 Answer

Subaru wrx when cold in morning boost then loses boost keeps doing that till have drove a couple of miles perfect when hot i have just fitted bigger top mount intercooler could it possibly be a leak would...


Hello, the turbo models have what are called tumble generator valves mounted between the intake manifold and cylinder head. They close between a precalibrated temp range to improve emissions at idle in cold weather, as soon as you touch the gas pedal they open and do not close again unless the vehicle is turned off and restarted with in that same engine temp range. I have seen TGV units fail either due to carbon build up or the valve actuator motor fails, which is usually the most common. The most common symptom is loss of boost, it sound like your vehicle may have a slow TGV or one is starting to fail. If you have a boost gauge, and it's showing the boost is actually being lost, I would suspect the boost control valve which is usually mounted on left side of the engine compartment if you were looking at the front of the vehicle. It will be inside of a little metal bracket with an electrical connector and a couple vacuum lines going to it. I hope this info helps...(subytech1)...

Jan 25, 2010 | 2001 Subaru Impreza

1 Answer

Egr valve


Sounds like you have a stuck open egr valve. This will cause a HUGE vacuum leak and your vehicle will run poorly -- if at all -- until it closes. Your problem could be mechanical or electrical. I suggest having a technician look at it.

Aug 04, 2009 | 2000 GMC Jimmy

1 Answer

Supercharger troubleshooting????


Check for a vacuum leak from the inlet and outlet hoses on the boost bypass valve and especially the boost solenoid.

Aug 03, 2009 | 1999 Pontiac Grand Prix

1 Answer

1996 subaru legacy rs boost loss


I don't know much about Subaru but I expect the turbo wastegate is controlled by vacuum which is switched by the engine management system.

In the old days the turbo wastegate was normally closed and the manifold pressure was fed into a servo which opened the gate at the predetermined pressure.

The new way of doing things is to have the wastegate normally open and the turbo producing no pressure until the engine management decides the time is right and it switches a vacuum supply to a vacuum servo which then closes the wastegate. With this system the wastegate is constantly moving and so is unlikely to give trouble though the vacuum servo sometimes leaks and vacuum lines give trouble.

A fellow I know had a similar problem where the engine check light would light up and he would lose performance. In theory this was because of an overboost condition but the repair shop after fiddling around with it for a week fitted a new EGR valve to produce a cure.

Sep 04, 2017 | 1996 Subaru Legacy

2 Answers

97 grand prix gtp starts then immediatly dies


If you have a GTP these engines use a hi output fuel pump. they use a fuel pump resistor located under the battery tray (look up from under the car) This resistor lowers the voltage to the fuel fump when not in boost mode. because of its locatoin it is prone to corrosion. if you bypass the wires and the engine starts and stays running replace the resistor

May 13, 2009 | 1997 Pontiac Grand Prix

2 Answers

Boost issues


No leak, it may be time for a service to your supercharger. There is maintance that most people don't know about and the bearing to the supercharger's wear out and then has play. The bad things is with the play the lobes in the supercharger starts to rub against the housing and then the tolerace clearance is larger then when the car was new. Long story short, time to have your supercharger rebuilt before it fails and kills the engine too. There is an other way you can look in too, here is there web page http://cartuning.ca. Good luck

Apr 07, 2009 | 1998 Pontiac Grand Prix

1 Answer

Lean fuel code error on a 1999 Pontiac Grand Prix GTP,3.8L motor


It is the boost bypass valve. The plunger will move with only enough throttle as it is connected to the throttle body.
The bypass solenoid you need is for the Eaton M90, the supercharger on your car. You can very likely get this part from zzperformance.

Nov 17, 2008 | 2001 Pontiac Grand Prix

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