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PostPosted: Wed Apr 16, 2014 11:18 am 
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Ok, this has been going on for a little while and I can't figure it out. The car runs perfect except when slowing down to a light it stalls almost every time. Seems to happen between 40-30 mph whether or not its in neutral or any other gear. Its not too big of an issue but it is slightly annoying. Most of the sensors had been replaced due to another issue we had before when we first got it. I also can't find any vacuum leaks.

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Last edited by haro1225 on Thu Sep 04, 2014 1:47 pm, edited 1 time in total.

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PostPosted: Wed Apr 16, 2014 11:26 am 
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Even IAC? MAP?

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PostPosted: Wed Apr 16, 2014 11:28 am 
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Not the MAP, IAC is new though. And no codes.

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2004 GTO....LS1, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2001 Volkswagen Passat, 1.8T 5MT......winter beater

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PostPosted: Wed Apr 16, 2014 11:38 am 
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Can you put it in neutral and keep it running by giving it a little throttle?

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PostPosted: Wed Apr 16, 2014 11:42 am 
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TPS? You've ensured that the TB is clean of EGR soot and that the blade closes, just enough to leave a little gap?

I'd say it sounds like a fuel delivery issue.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Wed Apr 16, 2014 11:47 am 
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TPS was changed, and throttle body cleaned. And yes I can keep it running in neutral with some throttle.

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2004 GTO....LS1, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2001 Volkswagen Passat, 1.8T 5MT......winter beater

yourgrandma wrote:
Hi.


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PostPosted: Wed Apr 16, 2014 11:53 am 
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Have you put a fuel pressure gauge on the fuel rail, pressurized it (don't start yet), and see if it's low? IF it isn't and it's getting pressure, that leads me to bad injectors... If you have access to a T2, while you have that fuel gauge hooked up, you should be able to do an injector balance test. Basically it'll cycle each injector. As an injector fires, fuel pressure in the rail should drop a say 5 - 10 psi. Really take the concensus of that the injectors are dropping it, and then find the one that DOESN'T drop the pressure... In this case, it sounds like it may be more than one!

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Wed Apr 16, 2014 8:08 pm 
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Have you considered relearning the throttle position? Might be off a smidge and closing more than it should. Since you are DBW it's also your low speed idle, you don't have an iac.

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PostPosted: Wed Apr 16, 2014 8:13 pm 
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BillBoost37 wrote:
Have you considered relearning the throttle position? Might be off a smidge and closing more than it should. Since you are DBW it's also your low speed idle, you don't have an iac.



This issue is not on his GP, but on a '96 GTP with the 3.4 DOHC V6, no DBW mess to deal with :)

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PostPosted: Wed Apr 16, 2014 10:56 pm 
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Yea, I was gonna say, all cable/pulley here.

But somewhat the same concept as I called above when I asked if the TB was free of EGR soot and whether or not the throttle blade wasn't open sufficiently at idle. But Ryan said it was cleaned and ok.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Thu Apr 17, 2014 10:38 am 
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Reminds me of leaving a manual car in a high gear snd stopping, usually stalls the motor out... Idk if it applies here though.

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PostPosted: Thu Apr 17, 2014 11:27 am 
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Unfortunately I don't have access to a Tech 2 but I'm going to check the fuel pressure and test the MAP sensor over the weekend. I may get a video of it happening too.

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2004 GTO....LS1, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2001 Volkswagen Passat, 1.8T 5MT......winter beater

yourgrandma wrote:
Hi.


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PostPosted: Thu Apr 17, 2014 11:42 am 
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Dumb question... (I'm pretty good at these).

Does it idle fine if in park, just sitting there??

If so, I wonder if a faulty vehicle speed sensor? Or possibly in the trans like a TCC solenoid not wanting to disengage...

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Thu Apr 17, 2014 1:16 pm 
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Wfy would the vss cause it to stall?

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1988 LE, Intercooled L67 loading......

2000 SSEi R.I.P. Dead now :( INTENSE FWI, polished LIM, P&P supercharger, custom radiator, standalone trans cooler, trans-go shift kit (donating to the 88)

2002 2500HD Silverado with the 8.1 Vortec and Alison tranny. Likes to eat GT Mustangs and lots of tires, and all while stock!


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PostPosted: Thu Apr 17, 2014 1:25 pm 
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It does surge slightly at idle in park, but not all the time.

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2004 GTO....LS1, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2001 Volkswagen Passat, 1.8T 5MT......winter beater

yourgrandma wrote:
Hi.


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PostPosted: Thu Apr 17, 2014 2:09 pm 
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Zeik75 wrote:
Wfy would the vss cause it to stall?



If it's reading too low, it may be reverting the vehicle back to 650 - 750rpm idle setting while the torque converter may still be engaged, snubbing it similar to if you don't push the clutch in, when you brake a vehicle to a complete stop

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


Last edited by CMNTMXR57 on Thu Apr 17, 2014 2:17 pm, edited 1 time in total.

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PostPosted: Thu Apr 17, 2014 2:16 pm 
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haro1225 wrote:
It does surge slightly at idle in park, but not all the time.


Normally I would say a post-MAF leak, which on the "X" motors, I always found it to be where the upper intake plenum meets the lower plenum, and bolts being stripped not allowing proper torque spec. Or, '96 versions GM allowed for separation of the upper intake plenum from the TB tube ('95 and earlier it was all one big PITA). That little gasket in there could be bad. Problem is, this things' PCM, being as sensitive as it is, would throw a lean code for sure. So I hesitate to say go look that way, but it doesn't hurt to have it in the back of your mind... Had they recently removed it to do the rear plugs?

Here is a pic of a '96 (mine), upper plenum removed with the TB side facing up...

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Thu Apr 17, 2014 4:11 pm 
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The plugs were changed (so they say) when they swapped the engine while it was out of the car but I'll look into that too.

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2004 GTO....LS1, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2001 Volkswagen Passat, 1.8T 5MT......winter beater

yourgrandma wrote:
Hi.


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PostPosted: Sat Apr 19, 2014 2:22 pm 
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Ok, so I think its fixed. I took off the map sensor and tested it at work. The sensor failed but, IT WASN"T EVEN THE RIGHT ONE FOR THE CAR! when I looked it up. According to the Wells sensor book, the one that was on this car is for a Cavalier. I took the correct one from an 02 Lesabre in the junkyard and put it on. I drove it about 5 miles and it didn't stall, and the idle is stable now. I'll give it a couple days and see what happens with it.

EDIT: Its doing it again, I have no idea why it didn't do it for me but they went out last night and it stalled a few times.

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2004 GTO....LS1, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2001 Volkswagen Passat, 1.8T 5MT......winter beater

yourgrandma wrote:
Hi.


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PostPosted: Wed Apr 23, 2014 10:24 am 
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If you have replaced the MAP itself, and it temporarily seemed to work, but then became problematic again, I would start looking at the plug, connections, harnesses, etc... This is indicative of an intermittent problem which usually results in poor contacts in the plug.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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