Forum Register TCG Mobile Casino Live Posting Feed Garage Arcade Members List Calendar Search Today's Posts Mark Forums Read
Go Back   The Chicago Garage > The Garage > TCG Technical > GM Tech & Discussion

User Tag List

Like Tree24Likes

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 08-19-2015, 10:13 AM   #1
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default Need Diagnostic Help...2008 Grand Prix GXP

I am typing this out for a friend of mine. He has been experiencing these issues in his stock 2008 Pontiac Grand Prix GXP with 65,000 miles for several months now and it seems to be getting more consistent. I had him write out a synopsis of what is going on so this is a direct quote from him. Let me know what you guys think and if you need more info. I appreciate any and all help!

" My car intermittently stalls when I take off from a stop. It gives me a little gas and then just cuts out on me then back in and back out. When it cuts back in it shifts really hard. It feels as if it is running through the gears with pauses in between before it gets to 4th, then takes off. Then as I am driving down the road, my gauges will go crazy sweeping forward and back, but they do not actually reflect what the car is doing. When the gauges go nuts, they all jump at the same time and the car cruises normal at this time."

It sounds like it could be one issue causing all of these symptoms. PCM/BCM? I was thinking about changing his fuel filter, but it wouldn't explain his gauge issues. He says that when it gets going, it drives fine. Anyways, let me know what you guys think. He loves the car and it is driving him nuts.

I should probably tag the wizard himself... @Turbocharged400sbc
__________________
2010 Toyota Tundra 4wd SR5 TRD Offroad
2017 Can Am Maverick Max X3 XDS

SleeperLS is offline   Reply With Quote
Old 08-19-2015, 10:47 AM   #2
 
lastls1's Avatar
 
Join Date: Sep 2013
Posts: 9,753
Casino cash: $62637200
4.56 per day
Default

I know this generation of Grand Prix had a lot of problems with the BCM in the car intermit shorting, causing crazy things to happen with the dash, displays etc. I would start by checking that out.
lastls1 is offline   Reply With Quote
Old 08-19-2015, 10:52 AM   #3
Dr. Pussy Slayer, MD
 
RICH17's Avatar
 
Join Date: Nov 2008
Location: The 007
Posts: 25,519
Casino cash: $110303144
6.55 per day
Default

I'd go through and find as many grounds as you can and make sure you clean them as well
TommyGloves and SleeperLS like this.
RICH17 is offline   Reply With Quote
Old 08-19-2015, 11:02 AM   #4
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

Quote:
Originally Posted by lastls1 View Post
I know this generation of Grand Prix had a lot of problems with the BCM in the car intermit shorting, causing crazy things to happen with the dash, displays etc. I would start by checking that out.
BCM located under the drivers dash or passenger dash?
SleeperLS is offline   Reply With Quote
Old 08-19-2015, 11:03 AM   #5
 
lastls1's Avatar
 
Join Date: Sep 2013
Posts: 9,753
Casino cash: $62637200
4.56 per day
Default

Driver side if I can remember correctly
SleeperLS likes this.
lastls1 is offline   Reply With Quote
Old 08-19-2015, 11:04 AM   #6
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

Thanks dude!

I do feel like all of these issue relate to one thing. It seems weird that multiple things would go wrong at the same time causing strange shit to happen.
SleeperLS is offline   Reply With Quote
Old 08-19-2015, 11:06 AM   #7
 
lastls1's Avatar
 
Join Date: Sep 2013
Posts: 9,753
Casino cash: $62637200
4.56 per day
Default

No Problem. Alldata says below the left side of the instrument panel, left of the steering column.

And yea computers and wiring can make things go crazy. My GTO had the crazy gauge thing going on. It was a few loose wires behind the cluster.
SleeperLS likes this.
lastls1 is offline   Reply With Quote
Old 08-19-2015, 11:42 AM   #8
 
Nate's Avatar
 
Join Date: Mar 2014
Location: Wondertucky
Posts: 506
Casino cash: $9654800
0.26 per day
Default

I've seen ignition switches do the same thing
Nate is offline   Reply With Quote
Old 08-19-2015, 12:01 PM   #9
. .
 
boostedguy05's Avatar
 
Join Date: Dec 2010
Posts: 20,483
Casino cash: $22563000
6.54 per day
Default

The GXP's were hit or miss if you had a good one or not. they were either amazing cars with no isues, or you had every issue known to man happen. @smug i believe had a bad one.
__________________
Quote:
Originally Posted by Mike K View Post
You're either a barely functioning idiot or you're a brilliant genius. I must study you.
boostedguy05 is offline   Reply With Quote
Old 08-19-2015, 12:29 PM   #10
 
SaturdaysGS's Avatar
 
Join Date: Jul 2007
Location: Chicago (Southside)
Posts: 4,084
Casino cash: $15123818
0.93 per day
Default

Check the ground that attaches to the trans bell housing, open the hood and look down.. its by the right fan. Assuming that ground is the same as an 04 GTP. Mine was loose and it would act all sorts of goofy, pretty close to what he's experiencing.
__________________
12 Tahoe PPV
04 Grand Prix GTP Comp G - Turbo'd
SaturdaysGS is offline   Reply With Quote
Old 08-19-2015, 12:55 PM   #11
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

I had him take a close look at all of the wiring especially around the engine and he found something interesting. Evidently he saw some mouse poop so he pulled off the engine cover and his MAP sensor wires are chewed up and somewhat charred. The connector and sensor look good, but the wires are definitely messed up. He is going to the auto store to get a bunch of stuff to replace the wires.

Bad MAP causing the surging issue? The dash issue I am still unsure of. He said the wires under the dash all look brand new and good.
EmersonHart13 likes this.
SleeperLS is offline   Reply With Quote
Old 08-19-2015, 02:02 PM   #12
Dr. Pussy Slayer, MD
 
RICH17's Avatar
 
Join Date: Nov 2008
Location: The 007
Posts: 25,519
Casino cash: $110303144
6.55 per day
Default

Fucking rodents.
RICH17 is offline   Reply With Quote
Old 08-19-2015, 02:28 PM   #13
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

As soon as he said mouse poop, I just said shiiiiiiiiiiiiiiiiiiiit.
SleeperLS is offline   Reply With Quote
Old 08-19-2015, 03:43 PM   #14
Chevy Humper
 
EmersonHart13's Avatar
 
Join Date: Jul 2007
Posts: 44,870
Casino cash: $52865000
10.24 per day
Default

Any bad sensor or misfunctioning sensor could cause all sorts of issues in modern cars.
SleeperLS likes this.
EmersonHart13 is offline   Reply With Quote
Old 08-19-2015, 04:48 PM   #15
Welllllllllll ya knowwwwwww.....
 
Turbocharged400sbc's Avatar
 
Join Date: Jun 2007
Location: hangover park IL
Posts: 26,499
Casino cash: $46588000
6.01 per day
Default

Search for the electrical connector terminal fretting tsb.
And rodent killer too
__________________
Double D Racing: Over-engineered and under-funded
Schlimbuilt: 32 orders of magnitude above "good enough"
https://drive.google.com/file/d/15tJ...ew?usp=sharing
04 GTP clone, a nice heap
84 Cressida waGN 3800jz-gte swapped scrap pile
68 F250 camper special 390fe/np435/d60...EFI 460/5spd ZF someday
94 Olds 442 (462ci-4wd-2 engines) new chassis underway... L67/4t80e^[email protected]
Quote:
Originally Posted by Wolfman View Post
3800>all other technology ever
Turbocharged400sbc is offline   Reply With Quote
Old 08-19-2015, 08:32 PM   #16
Forum Sponsor
 
shanefap's Avatar
 
Join Date: Jul 2015
Posts: 521
Casino cash: $10177300
0.36 per day
Default

Any codes?
__________________
WHITE CARS MATTER
White-2013 CTS-V Wagon- Stuff
White-2013 Accord EX-L- HIDS and MPG
White-2009 G8 GT-SOLD
White-2008 C6 A6-SOLD
White-2010 Denali Sierra AWD-SOLD
White-1979 Malibu-SOLD

shanefap is offline   Reply With Quote
Old 08-19-2015, 08:50 PM   #17
 
rocco's Avatar
 
Join Date: Jan 2012
Location: Aurora, IL
Posts: 516
Casino cash: $6299800
0.19 per day
Default

Sounds like 2 different problems. The stalling/surging sounds like a MAF problem.

The instrument gauges sound like a bad ground or possibly BCM like you mentioned.
rocco is offline   Reply With Quote
Old 08-19-2015, 08:59 PM   #18
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

Quote:
Originally Posted by shanefap View Post
Any codes?
He said that there were a few codes that have not triggered the check engine light recently. When he took it to auto zone to see what codes were thrown, they were related to a wheel sensor and nothing engine sensor related.
SleeperLS is offline   Reply With Quote
Old 08-19-2015, 09:01 PM   #19
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

Quote:
Originally Posted by rocco View Post
Sounds like 2 different problems. The stalling/surging sounds like a MAF problem.

The instrument gauges sound like a bad ground or possibly BCM like you mentioned.
I was initially thinking MAF as well, but after seeing how chewed up the MAP wires were I am thinking that might be the issue. Would a faulty MAP signal cause similar symptoms?
SleeperLS is offline   Reply With Quote
Old 08-20-2015, 07:10 AM   #20
Welllllllllll ya knowwwwwww.....
 
Turbocharged400sbc's Avatar
 
Join Date: Jun 2007
Location: hangover park IL
Posts: 26,499
Casino cash: $46588000
6.01 per day
Default

oh god yes, the map functions as a rationality check on the maf

which will really fuck with the drive by wire cars....
Turbocharged400sbc is offline   Reply With Quote
Old 08-20-2015, 09:28 AM   #21
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

Good to know. He should be fixing it today and getting back to me to see if the car works now. Hopefully it does. Thank you guys again for the input.
SleeperLS is offline   Reply With Quote
Old 08-20-2015, 11:52 AM   #22
. .
 
boostedguy05's Avatar
 
Join Date: Dec 2010
Posts: 20,483
Casino cash: $22563000
6.54 per day
Default

HOW THE HELL DID MOOSE POOP GET ALL THE WAY UP THERE
SleeperLS likes this.
boostedguy05 is offline   Reply With Quote
Old 08-21-2015, 05:46 AM   #23
Welllllllllll ya knowwwwwww.....
 
Turbocharged400sbc's Avatar
 
Join Date: Jun 2007
Location: hangover park IL
Posts: 26,499
Casino cash: $46588000
6.01 per day
Default

fyi they expanded the headlight module recall...rofl at the comments

GM expands headlight recall to 180k Buicks and Pontiacs
SleeperLS and ragingclue like this.
Turbocharged400sbc is offline   Reply With Quote
Old 08-22-2015, 03:55 PM   #24
The Midnight Sweeper
 
SleeperLS's Avatar
 
Join Date: Oct 2008
Location: Sandia Mountain
Posts: 10,767
Casino cash: $72069675
2.75 per day
Default

So evidently he said it will still stall every now and again but it is drastically improved. I am going over there on Monday to correctly connect the wires and solder them together. He just has them somewhat crimped at this time and I am hoping getting a good connection will do the trick. I am going to do a really good inspection while I am over there and check stuff out as well. Is there a re-learn or anything I need to do that will help? Evidently he has been dealing with this issue for a year, so will his stock tune be learned all weird causing the issue still? I am also going to clean the MAF and inspect it on top of looking everything else over. Thanks again for the help guys!
SleeperLS is offline   Reply With Quote
Old 08-22-2015, 08:48 PM   #25
Chevy Humper
 
EmersonHart13's Avatar
 
Join Date: Jul 2007
Posts: 44,870
Casino cash: $52865000
10.24 per day
Default

Just unplug the battery while you fix it, which should be done anyway...
EmersonHart13 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

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



All times are GMT -5. The time now is 12:09 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
User Alert System provided by Advanced User Tagging v3.0.6 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
no new posts