Question about 1997 Pontiac Grand Prix

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Major loss of power to my 1997 pontiac grand prix gtp

Seems to be sluggish in the acceleration and when the supercharger kicks on the car seems to jump and if i floor it the check engine light comes on. and the fuel pump is really loud u can hear it from 20 feet away from my car. if any one has any ideal please help.

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  • Pontiac Master
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There are to many things that can case your car the lose of power. Best thing to do is get the ECM scanned at Auto Zone for free, If there is no Auto Zone there most larger auto parts store can also scan the ECM and most garage now will scan for around $10.00 to $15.00.
You may want to change the Fuel Filter, a dirty fuel filter will restrict the fuel flow to the injectors making the engine run lean during boost causing miss fires and will burn up your spark plugs and worst the valves. If you do change the plugs, DO NOT REPLACE THEM WITH Platinum Plugs use a good set of copper plugs. the platnum's will heat up and glow causing detonation.
Good luck and hope this helps. keep me posted on how you do.

Posted on May 24, 2009

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Transmission Compatibility


As you see I provided you the models you can apply the transmission :The 4T65E-HD (code MN7) is a heavy duty version of the 4T65-E used with more powerful engines such as the LS4 V8 and L67/L32 supercharged V6. Applications: 2.93:1 MN7 Pontiac Bonneville SSEi L67 Chevrolet Impala L67 Chevrolet Monte Carlo L67 Pontiac Grand Prix GTP/GXP Buick Regal GS Buick Riviera L67 (97-99) So ,yes you can!

May 28, 2013 | 1998 Pontiac Grand Prix

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Would replacing a power steering pump in a 2002 Grand Prix GTP Supercharger cause the SuperCharger belt to break.


No.

The supercharger belt is on the main drive, the water pump is on the accessory drive. Provided that they are both properly installed of course.

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1998 Pontiac Grand Prix GTP 3.8 supercharge, Automatic Transaxle - 4T65-E rebuilt 2 years ago. Drove to work (26 miles) and all was fine, got in to leave and put gear selector in drive or 1st and nothing...


Your transmission for the GTP should be the 4T65-HD. If in fact it is not then that could very well be the problem. The 4T65-E is for the other 3.8L naturally aspirated models.

Aug 29, 2010 | 1998 Pontiac Grand Prix

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What kind of motor does a Pontiac Grand Prix have?


Depends on what sub-model you have. If you have an SE its a 3100 3.1L Engine. If its a GT its a 3800 3.8L Engine. If its a GTP its a 3800 3.8L but with a supercharger.

May 12, 2010 | 1997 Pontiac Grand Prix

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2000 Grand Prix GTP supercharger fluctuates when accelerating


There is no wastegate.

Change the spark plugs and pay special attention to the plug on bank 3. Look for physical damage on the electrode...cracked, bent etc.
Use Autolite 605's copper core gapped to .055" and NEVER run less than 92 octane.

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How supercharger oil is need for the supercharger, 1997 Grand Prix GTP?


The oil should be changed every 30K miles according to the Pontiac manual.
However, it is best to change it sooner or whenever you don't know when the last change was done.

Dec 11, 2009 | 1997 Pontiac Grand Prix

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98 grand prix gtp tranny


The tranny is called a 4T65E-HD(heavy duty). The rebuild kits are the same for both supercharged and non-supercharged cars. The occasional harshness is caused by the EPC solenoid hanging up from wear. I recommend installing a Superior Shift Correction kit, 4th clutch hub (the splines strip), EPC, and TCC/PWM solenoid.

This combo works great!

Apr 03, 2009 | 1998 Pontiac Grand Prix

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