Thread: Slight knocking and idle jumping from 500-1500 then dies

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  1. #1 Slight knocking and idle jumping from 500-1500 then dies 
    Master-Breaker CapnBreakAlot's Avatar
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    I started my car up this morning and heard a little bit of knocking, I pulled it into the garage and after putting it in park the idle started going from 500-1500 rpm and it would slowly get lower and lower then died. I gave it about 45 minutes then started it again, no knocking. So I pulled out into the driveway and put it into park then the idle started jumping again. I gave it a little gas and it seemed to quit after running for a minute and being revved a little. Weird.. Any ideas?

    2001 Buick Regal GSE - S1X - Blue 90# springs - TOG's - Devils Own Water/Methanol kit - 80s - E85 - ZZP 3" dual catback - 2.7 - 23* - N* TB - LQ4 MAF - Gen V - TEP Stage 3 Trans - 3.29s - Self tuned with HPT - 347/423 --- Sold
    ​2013 5.slow F150 - MAK catless Y pipe - Roush catback - self tuned with HPT
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  2. #2 Re: Slight knocking and idle jumping from 500-1500 then dies 
    I live here. Slick2500's Avatar
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    Sounds like an exhaust leak. Could be the rear manifold to down pipe gasket. As far as the rough idle that could be a few things maf, fuel pressure regulator, vac leak, just to name a few.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  3. #3 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Moderator dsmuts's Avatar
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    Valve cover gasket could be leaking a little bit.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
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  4. #4 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Master-Breaker CapnBreakAlot's Avatar
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    So on my way to work I discovered that at around 55mph it'll jump rapidly from around 1500rpm to 1600rpm and back down three or four times then stop. Then heading home I caught it in the act. Video coming soon.
    2001 Buick Regal GSE - S1X - Blue 90# springs - TOG's - Devils Own Water/Methanol kit - 80s - E85 - ZZP 3" dual catback - 2.7 - 23* - N* TB - LQ4 MAF - Gen V - TEP Stage 3 Trans - 3.29s - Self tuned with HPT - 347/423 --- Sold
    ​2013 5.slow F150 - MAK catless Y pipe - Roush catback - self tuned with HPT
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  5. #5 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Master-Breaker CapnBreakAlot's Avatar
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    It seems to surge like that and make a sort of knocking noise for a bit then it just stops..
    2001 Buick Regal GSE - S1X - Blue 90# springs - TOG's - Devils Own Water/Methanol kit - 80s - E85 - ZZP 3" dual catback - 2.7 - 23* - N* TB - LQ4 MAF - Gen V - TEP Stage 3 Trans - 3.29s - Self tuned with HPT - 347/423 --- Sold
    ​2013 5.slow F150 - MAK catless Y pipe - Roush catback - self tuned with HPT
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  6. #6 Re: Slight knocking and idle jumping from 500-1500 then dies 
    GT Level Member natethegreat's Avatar
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    Could be the idle control valve.
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  7. #7 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Master-Breaker CapnBreakAlot's Avatar
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    Idle control valve? Thats a new one on me lol. Sorry i'm still a newbie. Still learning hah.
    2001 Buick Regal GSE - S1X - Blue 90# springs - TOG's - Devils Own Water/Methanol kit - 80s - E85 - ZZP 3" dual catback - 2.7 - 23* - N* TB - LQ4 MAF - Gen V - TEP Stage 3 Trans - 3.29s - Self tuned with HPT - 347/423 --- Sold
    ​2013 5.slow F150 - MAK catless Y pipe - Roush catback - self tuned with HPT
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  8. #8 Re: Slight knocking and idle jumping from 500-1500 then dies 
    GT Level Member natethegreat's Avatar
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    Pretty sure thats what it's called, anyways on my car whenever it got down to an idle it would start to surge and jump around, may not be your problem but it's something to look into.
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  9. #9 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Turbo is the way to go. BillBoost37's Avatar
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    IAC isn't used when cruising for the most part.

    Look to ignition related causes. Isn't that cone filter new? DRy or oiled? If oiled...clean the maf.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  10. #10 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Moderator dsmuts's Avatar
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    Dry filter. Double check your plug wires. I'm not sure they are clippedin all the way. I never checked them after you guys moved them
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  11. #11 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Moderator dsmuts's Avatar
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    I think I found his vacuum leak

    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  12. #12 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Turbo is the way to go. BillBoost37's Avatar
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    What are you showing us Cap'n FuzzyPic? I see the standard ring..but cna't see any issue with it.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  13. #13 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Moderator dsmuts's Avatar
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    It's not on his car that's the problem lol
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  14. #14 Re: Slight knocking and idle jumping from 500-1500 then dies 
    GTX Level Member hensleya1's Avatar
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    dsmuts--

    Is that an o-ring that goes on the plastic piece he broke off the top of his blower?

    If so, I'll rumage around in my tool box to see if I have a spare o-ring that matches that size.

    Ace needs a toolbox for Christmas. Dan, if you're in twenty bucks, so am I, to get him a set of wrenches and sockets and other odds and ends.
    2003 GT Limited Edition 199k - The $600 winter beater.
    2004 Buick LeSabre 172k - Top Swapped, 3.5 pulley, 1.9 rockers, SLP headers... still slow...
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  15. #15 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Turbo is the way to go. BillBoost37's Avatar
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    You guys gonna get him a pile of parts too? Sounds like he breaks about 50 things per one fix.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  16. #16 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Master-Breaker CapnBreakAlot's Avatar
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    My name on here should be changed to something like Captain breaks a lot lol
    2001 Buick Regal GSE - S1X - Blue 90# springs - TOG's - Devils Own Water/Methanol kit - 80s - E85 - ZZP 3" dual catback - 2.7 - 23* - N* TB - LQ4 MAF - Gen V - TEP Stage 3 Trans - 3.29s - Self tuned with HPT - 347/423 --- Sold
    ​2013 5.slow F150 - MAK catless Y pipe - Roush catback - self tuned with HPT
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  17. #17 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Turbo is the way to go. BillBoost37's Avatar
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    Your wish has been granted. Best of luck figuring that out and logging back in.

    Dan..or one of you guys with his number. Let him know.. will ya

    Capnbreakalot
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  18. #18 Re: Slight knocking and idle jumping from 500-1500 then dies 
    I live here. Below Average Joe's Avatar
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    nice
    Quote Originally Posted by Sven The Sexman View Post
    Bill had a major role in all of the Star Wars movies; he was the force.
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  19. #19 Re: Slight knocking and idle jumping from 500-1500 then dies 
    Master-Breaker CapnBreakAlot's Avatar
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    I didn't even need to log back in. This name suits me much better now lol
    2001 Buick Regal GSE - S1X - Blue 90# springs - TOG's - Devils Own Water/Methanol kit - 80s - E85 - ZZP 3" dual catback - 2.7 - 23* - N* TB - LQ4 MAF - Gen V - TEP Stage 3 Trans - 3.29s - Self tuned with HPT - 347/423 --- Sold
    ​2013 5.slow F150 - MAK catless Y pipe - Roush catback - self tuned with HPT
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  20. #20 Re: Slight knocking and idle jumping from 500-1500 then dies 
    I live here. Below Average Joe's Avatar
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    it does lol
    Quote Originally Posted by Sven The Sexman View Post
    Bill had a major role in all of the Star Wars movies; he was the force.
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