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Old 06-07-2011, 01:20 PM   #1
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Default New User -- 1998 Pontiac Grand Prix GTP

Greetings,

I'm a new user seeking to economically extend the life of my 1998 Pontiac Grand Prix GTP. Perhaps I'm deluded, but even at 145,000 miles, it is still a great car.

The problem that brought me to the forum deals with my supercharger which has suddenly failed. I suspect the boost control actuator and will research in the appropriate places here at GMForum.com. The goal is to avoid a mechanic holding me hostage to an unnecessary supercharger replacement. The unit still quietly spins, but there is not boost indicated or actual--I'm amazed at the loss of power during acceleration.

Thanks to all for a place to participate and learn!

Regards,
Monte
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Old 06-07-2011, 01:25 PM   #2
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Use your hand to rev the engine, does the actuator move? If not, check the vacuum lines, replace if needed. they do get brittle with time. Generic vacuum line works fine. If you have vacuum and it'* still not working, can you move the by pass arm? If so the actuator may be bad. ZZ performance sells them. Easy to replace. Most anything you need to do to keep your car running and out of the shop can be found here.
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Old 06-07-2011, 02:58 PM   #3
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Welcome to GM Forum. Don't forget to post up some pics of your ride
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Old 06-07-2011, 04:40 PM   #4
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welcome.. we have quite a few GTP/SSei/Ultra owners/pro'* here that know that SC 3800 motor inside and out.

Hope u feel at home
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Old 06-07-2011, 05:12 PM   #5
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welcome
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Old 06-07-2011, 07:11 PM   #6
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Your response, along with the other greetings, is inspiring me to take this into my own hands. I'll follow the advice and get back with you. I had previously scoured the Internet without finding ZZ Performance. Thanks for that tip, too!

I must say the group is amazingly friendly and supportive.

I'll get back to you guys after my inspection tour--courtesy of Danthurs...
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Old 06-07-2011, 07:29 PM   #7
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Good to hear that you're going to try it yourself. Its a good feeling fixing something on your own.

I'm glad you're liking it here, its a great place full of a lot of good information, and awesome people.
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Old 06-07-2011, 09:27 PM   #8
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welcome to the site
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Old 06-07-2011, 09:46 PM   #9
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Welcome. Pictures please!
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Old 06-07-2011, 10:13 PM   #10
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Welcome to the site! It would be sweet if you got some pics of the car in too. We love pictures here lol...Good luck with the fix, I am sure you'll be fine with these guys on here to help you.
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