Surge at cold idle?

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Nov 28, 2004 | 07:48 PM

LS1BlackBird99

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Surge at cold idle?

Just got my delteq system put on with new wires and plugs. It seems to kind of surge at idle when it is cold and do it worse when it goes into gear. It seems to clear up though once the car warms up and it runs like a freight train. Any idea on what this could be guys?
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When I first start it when cold it kind of takes a little longer than usual. I then put it into gear and the RPM's drop like it is almost going to die and then it kinda pops back up. This happens each time when I come to a complete stop and then proceed to go again. Any ideas guys? I am kinda in the pits when it comes to money right now. I just hope this is a CHEAP fix.

Nov 29, 2004 | 01:03 PM

LS1BlackBird99

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*Here is another update*

This morning I started up the car and it sounded like my car had a huge cam in it. It kept on loping really really bad. I then put it into gear and it surged and came back up. I tried driving to class the way it was and when i was slowly accelerating it caused everything to shake and the car was just stumbling like crazy. Then 20 seconds later it would clear up for a second or two and then go back to running like crap. It didn't stop running bad until I reached school where the car had warmed up. Does this still sound like the same problem??

Nov 29, 2004 | 01:53 PM

Aries

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From: Austin, TX

almost sounds like a bad coil pack...
LS1's get this problem when one is going out.

Nov 29, 2004 | 02:28 PM

Poik

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From: Bellingham/Edmonds, WA

This is a LT1 though, right..? Maybe some spark plug wires aren't plugged in correctly..? I'm still a little confused, but I would first check that all wires are plugged in securely, and to the right plugs. Do you have headers? Could it possibly be a burnt wire?

Nov 29, 2004 | 04:31 PM

LS1BlackBird99

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They are all plugged up tightly. I do have headers but the wires are routed so they won't get burnt and they aren't as of yet. I am just kinda curious why this happens mainly when the engine is cold and not when it is warmed up.

PS: Yes this is an LT1 Trans Am.

Nov 29, 2004 | 09:06 PM

LS1BlackBird99

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Just went out and started up the car, totally cold. Still runs terrible. I went ahead and jotted down every number off of my scanmaster while it was running like crap. I know a lot of these numbers look really funky but usually get a lot better once the car warms up. All of these numbers were taken in a parking lot when the engine was COLD. Tell me what you guys think...

LT1 Scanmaster Readings from 1994 LT1 A4 Trans Am:

MAF = 13
SP = 14-16
LP = 02.6
rP = 02.5-02.6
LbL= 128
rbL = 128
CEL = 16
Lin = 128
Rin = 128
02 L = 195-260
02 R = 054
ATS = 60
CLT = 118
TPS = .56
TPP = 0
r = 925-1000
IAC = 88
BAT = 13.6
EGR = 0
MAP = 10.6-10.9
BAR = 29.6
ACP = .78
CCP = 0

Nov 29, 2004 | 10:51 PM

LS1BlackBird99

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Here is a test with the scanmaster while the engine is warm.

MAF = 6-7
SP = 19-20
LP = 1.6-1.8
rP = 1.5-1.8
LbL= 108
rbL = 108
CEL = 16
Lin = 120-127
Rin = 119-125
02 L = 130-800 somethin
02 R = 105-800 somethin
ATS = 84
CLT = 176
TPS = .56
TPP = 0
r = 625-650
IAC = 36-47
BAT = 13.0-13.2
EGR = 0
MAP = 10.4-11.5
BAR = 29.6
ACP = 1.16-1.29
CCP = 0