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strange new problem

This is a discussion on strange new problem within the General Help forums, part of the LSx Technical Help Section category; ok so on my way to supper I was sitting at a red light then all on the sudden my ...

  1. #1
    Member Faught's Avatar
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    strange new problem

    ok so on my way to supper I was sitting at a red light then all on the sudden my car jerked the rpm's dropped below the normal 500rpm but as soon as I started to go all was fine. I got home and I put the car in park and the rpm's bounced a little, as soon as i put the car in drive with my foot on the break the car acts up again. also I noticed around 2200-2500 rpms I have a slight ticking sound. hopefully the vid I took will be more help if i can get it up, but has any one dealt with a problem like this? it feels like a misfire or something but I don't have any codes thrown.


    [ame]http://www.youtube.com/watch?v=PBTL7X0ZHIo[/ame]

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    None Shall Pass Knight's Avatar
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    Have you cleaned the MAF recently? If not, I'd start there. Could also be a vacuum leak.

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    Member Faught's Avatar
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    it has bin a while sense i cleaned the MAF ill give that a shot and hope.

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Knight View Post
    Have you cleaned the MAF recently? If not, I'd start there. Could also be a vacuum leak.
    Agree. Have you check the PCV tubing that goes around the back of the intake from the drivers side valve cover to the passenger side of the Throttle body? The rubber rots and the plastic cracks/melts.

    i also noticed your low coolant light is on have you check that?(not that is related) When is the last time you changed your plugs and wires?

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    Member Faught's Avatar
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    well now that you mention the pcv, I have a custom housing I made about 4K miles ago cuz there was no way i was paying 125 bucks for that. I need to clean the coolant sensor thats why it is on. I changed the plugs and wires ~8K miles ago. when I get my ls6 intake I might as well eliminate the PCV and go with a catch can (if im not mixing something up lol)

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    Waiting on the Tree transamtom's Avatar
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    Vacuum leak is the probable cause.

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    Spaz is My Mentor SMWS6TA's Avatar
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    op, check out the LS6 VCT mod to help fix your pcv issues

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    op, check out the LS6 VCT mod to help fix your pcv issues
    Im loving it! my idle is fixed finally.

  9. #9
    Member Faught's Avatar
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    I replaced the fuel filter, checked the fuel pressure, rechecked the plugs and wire. I also checked the ALT. and bat, as well as all the wires. so that leaves it to something mechanical . I dont think there is a misfire because it just seems like something is off or out of wack. i did notice while i was driving it that when i was putting along at 30mph every now and then there was a slight hesitation or lack of power for a split second.


    I did just notice the far back header on the drivers side is discolored, doesn't that mean that cylinder is running hot? what would cause that?
    Last edited by Faught; 06-24-2011 at 07:52 AM.

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    Member Faught's Avatar
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    bump

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    Senior Member JayTA98's Avatar
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    a few things. have you cleaned the MAF yet? I know you said you that recheck the plugs and wires but how old are them? The wires need to be checked with an ohm meter. The plugs can look good and have sprak but doesn't mean they are good. Have you recheck all the PCV stuff looking for craks or leaks?

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    Senior Member JayTA98's Avatar
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    mine was doing somthing similar to yours when I 1st bought and it was a leak in the PCV tubing. I replaced all that crap and it was better. When I put my new plugs and wires it got better to the point that It jsut slightly miss in idle.

    When i did the LS6 VC the problem was gone. it sounds like a vaccum leak. I will still clean the MAF before anything.

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    Member Faught's Avatar
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    I have cleaned the MAF the plugs and wires are all good, I cleaned the IAC, I cant see any cracks leaks or anything in the PCV tubing. I changed the fuel filter. and like i said above i just noticed that the far back pipe of my header on the driver's side is discolored, what could cause that?

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    Spaz is My Mentor SMWS6TA's Avatar
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    exhaust leak

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    Member Faught's Avatar
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    don't mind the color on the spark plug wire that's just my camera and the firewall has bin discolored like that b4 the headers.

  16. #16
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Faught View Post
    don't mind the color on the spark plug wire that's just my camera and the firewall has bin discolored like that b4 the headers.
    Click for full size
    that looks like a an exhaust leak my friend. Did you used new gasket when you did headers?

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    Member Faught's Avatar
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    yep

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    Member Faught's Avatar
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    I replaced the header gasket, I found some bad plug wires so i just got some 8.5mm wires on there and I still have the problem, it is slowly getting worse. I did rev the engine to 1K and kept it there for a short time, when it was at 1K rpm it was very noticeable it kinda reminded me of a car with a big ass cam even sounded like it with the "kathump kathump" and my oil pressure was bouncing like crazy. WTF my poor car, I have to drive it cuz it is my only way to get to school and back but i don't want to cuz I don't want to blow it up.

  19. #19
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Faught View Post
    I replaced the header gasket, I found some bad plug wires so i just got some 8.5mm wires on there and I still have the problem, it is slowly getting worse. I did rev the engine to 1K and kept it there for a short time, when it was at 1K rpm it was very noticeable it kinda reminded me of a car with a big ass cam even sounded like it with the "kathump kathump" and my oil pressure was bouncing like crazy. WTF my poor car, I have to drive it cuz it is my only way to get to school and back but i don't want to cuz I don't want to blow it up.
    are you pushing the wires in the coils until you hear 2 clicks? did you cleaned the MAF?

  20. #20
    Member Faught's Avatar
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    yes 2 clicks and yes i cleaned the MAF and cleaned the idle air valve thing on the TB as well.

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