gtp missing and low boost - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-11-2013, 01:00 AM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
curtis1's Avatar
 
Join Date: Aug 2013
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
curtis1 is on a distinguished road
Default gtp missing and low boost

i have a 1999 grand prix gtp and i got a problem i cant figure out. First the */c coupler was bad and making noise so i fixed that and it ran good. The next day it started missing and hardly has any boost. So i hooked it to a computer and it said faulty wastegate. Is that the problem or not. Is wastegate the same as bypass valve or is that a seperate piece? I was told take off the */c belt and see if problem still occurs. I did that and it still misses. I Also hear it could be catalytic converter. was told to take out o2 sensor and drive it and see if thats it so guess ill try that 2marro. please tell me somebody knows what the problem is. It also pops up a light that says service engine. i know it needs o2 sensors cause comp. said so but thats not what im worried about. Please help and thanks for reading.
curtis1 is offline   Reply With Quote
Old 08-11-2013, 05:40 AM   #2
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

You should probably get that scanned before doing anything else., Misfires will cause the car not to have any boost.
Mike is offline   Reply With Quote
Old 08-11-2013, 01:35 PM   #3
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
curtis1's Avatar
 
Join Date: Aug 2013
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
curtis1 is on a distinguished road
Default

i had it scanned and it says o2 sensors and wastegate bad
curtis1 is offline   Reply With Quote
Old 08-11-2013, 03:47 PM   #4
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Any chance you can post the codes for us? There are MULTIPLE codes for a O2 sensor.
Mike is offline   Reply With Quote
Old 08-11-2013, 03:53 PM   #5
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
curtis1's Avatar
 
Join Date: Aug 2013
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
curtis1 is on a distinguished road
Default

i will wednesday after i go get plugs and wires
curtis1 is offline   Reply With Quote
Old 08-11-2013, 04:53 PM   #6
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
curtis1's Avatar
 
Join Date: Aug 2013
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
curtis1 is on a distinguished road
Default

also i am hearing a supercharger dont have a wastegate only turbos do. So does my supercharged gtp have one or not. If so where is it. A nd if it dont why does the scanner say its bad
curtis1 is offline   Reply With Quote
Old 08-11-2013, 05:18 PM   #7
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

You actually have a boost bypass valve. Why its called a wastegate, I have no idea. My Bonneville has one.
Mike is offline   Reply With Quote
Old 08-11-2013, 07:25 PM   #8
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
curtis1's Avatar
 
Join Date: Aug 2013
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
curtis1 is on a distinguished road
Default

ok thanks mike. After i get the plugs and wires on i will get you the codes it pops up with. Thanks Mike
curtis1 is offline   Reply With Quote
Old 08-14-2013, 03:21 PM   #9
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
curtis1's Avatar
 
Join Date: Aug 2013
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
curtis1 is on a distinguished road
Default

Ok i got the missing fixed. It was just plugs and wires. my boost is still not correct. Had it scanned and it says bypass valve solenoid. so should i buy just the solenoid or should i buy the valve also? which one goes bad the most?
curtis1 is offline   Reply With Quote
Old 08-14-2013, 07:39 PM   #10
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,641
Thanked 995 Times in 772 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Put a muli-meter on the solenoid first and check the OHMs.
Mike is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1999 gtp low boost curtis1 Pontiac 2 08-14-2013 07:40 PM
low boost readout on GTP boostedponty Pontiac 7 05-17-2010 09:20 PM
Low boost, no boost problem immusicman Forced Induction 12 09-27-2009 01:05 AM
Boost Control Solenoid Maintenance and Boost Control Actuator Test for low Boost* Toddster Trouble shooting + Test Procedures 0 03-21-2009 07:24 PM
low stock Boost vs high stock boost hvactech Performance, Brainstorming & Tuning 12 05-10-2005 11:14 PM


Tags
grand prix gtp

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:24 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.