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having idle and decel issues...not sure whats up. any ideas?

This is a discussion on having idle and decel issues...not sure whats up. any ideas? within the External Engine forums, part of the LSx Technical Help Section category; When i start the car cold, it starts up fine. it smells like fuel really bad though. lets say i ...

  1. #1
    Senior Member ninobrn99's Avatar
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    having idle and decel issues...not sure whats up. any ideas?

    When i start the car cold, it starts up fine. it smells like fuel really bad though. lets say i pull out of my parking spot and its still cold. ill reverse and then put it in first gear and start to go. when i let off, the idle drops to about 1500 and stays there. as it warms up it gets lower and lower until it reaches where it should be, about 950. well i take off and drive for a few seconds. when i let out the clutch, take it out of gear and brake, the rpms dip down to about 250-300 and then climb back up again. it does that for a bit, then will finally stablize after a while. however, when i try to give it more than 60% throttle and shift quickly, i can hear it popping in the exhaust. any thoughts as to what could cause this? it happened after i dyno'd it and has been doing it since. now for the mods:
    370 iron block
    stock ls6 heads
    prc springs
    f13 112
    pacesetters
    tsp catted y
    ram clutch
    42# injectors
    royal purple 10w-30
    ngk tr6s
    msd 8.5mm wires
    ls2 chain
    stock oil pump
    stock alt.
    stock water pump
    ls6 intake
    stock ported tb
    maf in place, but running in sd
    o2s are enabled
    MTI lid
    asp pulley
    ive also noticed that there are a few times that im going to turn from a stop and the car sputters and seems like its going to die, but still goes, but barely! no matter how much gas i give it. its happening a bit more often than it did in the past. im thinking maybe its the pulley, but havent had a chance to swap them out to see.

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    Senior Member ninobrn99's Avatar
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    also, ive had my battery and alternator checked and they're both fine. i havent pulled my plugs to check them yet, but ive thought of doing the following:
    changing my plugs
    wires
    intake gaskets
    iac sensor
    tps sensor
    crank pulley
    and also the oil. going back to regular oil. i did notice it started happening after the last oil change. not immediately after, but after it.

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
    00 Black Ram Air Trans Am

    Same here, hoping someone knows what the hell is going on. Mine started after cam swap.

  4. #4
    Senior Member ninobrn99's Avatar
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    pm me a list of all your mods..all of them and whats still stock

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    Quote Originally Posted by ninobrn99 View Post
    pm me a list of all your mods..all of them and whats still stock
    sent, but it's not showing up in my outgoing box. Did you get it?

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    Senior Member ninobrn99's Avatar
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    nope..eh, just post it then.

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
    00 Black Ram Air Trans Am

    http://www.ls1tech.com/forums/showth...highlight=idle

    Above thread from tech site explains it all. LS6 manifold has been removed, it was leaking, but it didn't cure all of my problems. Still dips exactly like yours. Mods:
    Volant CAI
    TBB
    Ported TB
    TR224 .563 114 cam
    Pacesetter LTs, ORY, and Hooker CB

    LS1edit tuning couldn;t get rid of problems

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    Senior Member ninobrn99's Avatar
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    so we have pacesetters and the ls6 intake in common. what springs and stuff?

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    whatever came with the TR224 cam package....seems like everyone keeps thinking it is in the tune. I don't know wof anyone around here with HPTuners, edit can't log the data

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    Senior Member ninobrn99's Avatar
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    well u met up with bill. he knows his shit pretty well. so the fitting in the back of the intake for the vaccum broke? ive been thinking maybe its my intake, but i wasnt sure.

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    Quote Originally Posted by ninobrn99 View Post
    well u met up with bill. he knows his shit pretty well. so the fitting in the back of the intake for the vaccum broke? ive been thinking maybe its my intake, but i wasnt sure.
    Yeah fitting broke, replaced with LS1 intake and it got rid of the major revving problems. But I am still stuck with the decel when I let the gear out, or when I slow down under 10 mph it dips. Bill checked it out pre-LS1 intake install, and since his prices have jumped since he started a website up and all. $600 is the quote on his site for a tune now.

    Funny thing I'm over on HPTuners looking for a local guy and I saw your thread looking for a tuner in HI

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    Senior Member ninobrn99's Avatar
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    sad thing is, i dont have my ls1 intake anymore. if the decel is still happening, then its something else on top of that.

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    Quote Originally Posted by ninobrn99 View Post
    sad thing is, i dont have my ls1 intake anymore. if the decel is still happening, then its something else on top of that.
    Lots of folks suggesting throttle cracker problems or RAF table are off, they seem to be the common suggestions. Read alot about possible VE tables or some crap, too much to remember

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    Senior Member ninobrn99's Avatar
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    ive done both and it still happens. at first i thought it was maybe the o2s, but it it happens when its cold, what does that tell ya? its not the o2s sob!! i just wanted to sell the car and move on

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    Quote Originally Posted by ninobrn99 View Post
    ive done both and it still happens. at first i thought it was maybe the o2s, but it it happens when its cold, what does that tell ya? its not the o2s sob!! i just wanted to sell the car and move on
    I'm pissed because I have a supposedly "small easily tunable cam"

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    Senior Member ninobrn99's Avatar
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    haha..i feel ya man. ive thought maybe the oil, but have yet to change it. it has something to do with being hot and cold and idle and decel...but what?! if mike and bill couldnt figure it out, im nervous

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    Senior Member Hurley711's Avatar
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    Quote Originally Posted by ninobrn99 View Post
    haha..i feel ya man. ive thought maybe the oil, but have yet to change it. it has something to do with being hot and cold and idle and decel...but what?! if mike and bill couldnt figure it out, im nervous
    I posted over there too. Jimmyblue is good but he is all the way down in FL. I'm wondering if it might be my throttle body being ported? Maybe screw isn;t set right?

  18. #18
    Senior Member Hurley711's Avatar
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    Quote Originally Posted by ninobrn99 View Post
    haha..i feel ya man. ive thought maybe the oil, but have yet to change it. it has something to do with being hot and cold and idle and decel...but what?! if mike and bill couldnt figure it out, im nervous
    And as far as oil, Fran switched me to Mobil 1 during camswap, since I have changed to Castrol Syntec European formula, the Made In Germany stuff. Car is quiter but still dips, so I don;t think it is the oil....

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    Senior Member ninobrn99's Avatar
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    so there goes that. have u changed the plugs or checked them at all? maybe the springs to see if any are broken or binded?

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    Senior Member Hurley711's Avatar
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    Quote Originally Posted by ninobrn99 View Post
    so there goes that. have u changed the plugs or checked them at all? maybe the springs to see if any are broken or binded?
    New spark plugs went in 5 months prior to cam swap during header install. New springs and titanium retainers went in with cam, along with hardened PR

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