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 Post subject: Idle surge
PostPosted: Sun Sep 02, 2018 12:56 pm 
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Joined: Sun Apr 15, 2012 12:13 pm
Posts: 68
Year and Trim: 05 red GXP, 05 white GXP, 03 SSEI, 02 SSEI
Reached an impasse. This is my wife's GXP and the one I pulled the engine to R&R the oil manifold plate. No codes but it has an Idle surge. I performed a injector cutout test with my Tech II and all injectors cut out with a noticeable reduction in RPM. Viewed the misfire graph and when it surges cly 4 has the accumulated current counters, reaching the max of 64. When there is no surge the accumulated current counters reads zero.

I've checked for vacuum leaks, swapped coils and plugs, clean MAF sensor and throttle body with MAF cleaner. New coil packs on 2,4,6,8 and all new plugs.


Any ideas????

Kevin

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05 GXP Red, 05 GXP White, 03 SSEI, 02 SSEI, Sold 98 SSEI, 98 SE, 98 SLE, 98 SSE


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 Post subject: Re: Idle surge
PostPosted: Tue Sep 04, 2018 1:04 am 
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Joined: Wed May 13, 2009 10:45 pm
Posts: 5535
Location: CHICAGO
Year and Trim: 2006 STS-V, 2004 GTO, 2009 G8 GT
Two thoughts;

1) TPS readings. What's going on here?

2) Cat Converter issues? But that doesn't explain only one cylinder loading 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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 Post subject: Re: Idle surge
PostPosted: Thu Sep 06, 2018 7:55 pm 
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Joined: Sun Apr 15, 2012 12:13 pm
Posts: 68
Year and Trim: 05 red GXP, 05 white GXP, 03 SSEI, 02 SSEI
What should the TPS readings be? I already shipped my manuals for my next move.

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05 GXP Red, 05 GXP White, 03 SSEI, 02 SSEI, Sold 98 SSEI, 98 SE, 98 SLE, 98 SSE


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 Post subject: Re: Idle surge
PostPosted: Fri Sep 07, 2018 1:17 pm 
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Joined: Wed May 13, 2009 10:45 pm
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Location: CHICAGO
Year and Trim: 2006 STS-V, 2004 GTO, 2009 G8 GT
I don't have the stat memorized, but TPS is measured from 0 - 5 volts. 0 volts = closed. 5 volts = WOT.

So for idling, it should be somewhere less than or around 1 volt and be steady.

There are three circuits on a TPS. One supply voltage, one a ground, and one the actual voltage of the sensor.

Supply should be ~5v
Ground should be grounding
The actual is the actual blade/throttle position.

If you have a bad ground, and or you see that actual bouncing around... That might steer you somewhere.

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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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 Post subject: Re: Idle surge
PostPosted: Fri Sep 07, 2018 2:47 pm 
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Joined: Sun Apr 15, 2012 12:13 pm
Posts: 68
Year and Trim: 05 red GXP, 05 white GXP, 03 SSEI, 02 SSEI
TP - 0%
TP - .55 at idle (Surging)
IAC goes from 50-108 counts
MAF goes from 0-12 g/s
Engine load 31-57%
MAP 41-56kpa
MAP 1.06 - 2.69 volts
No codes or check engine light. Ground connections on front lower trans connected, IIRC 3e and clean.

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05 GXP Red, 05 GXP White, 03 SSEI, 02 SSEI, Sold 98 SSEI, 98 SE, 98 SLE, 98 SSE


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 Post subject: Re: Idle surge
PostPosted: Mon Oct 29, 2018 6:21 pm 
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Joined: Sun Apr 15, 2012 12:13 pm
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Year and Trim: 05 red GXP, 05 white GXP, 03 SSEI, 02 SSEI
I've checked all of my known vacuum connections for leaks and still have an intermittent surge. Most prevalent when initialing coming to a stop and then goes away for a moment and then comes back. Again no check engine light.


Sorry it's been a while but we moved to FL and been busy at work.

Kevin

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05 GXP Red, 05 GXP White, 03 SSEI, 02 SSEI, Sold 98 SSEI, 98 SE, 98 SLE, 98 SSE


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