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Installed Extractors now popping on acceleration....

Discussion in 'VY Holden Commodore (2002 - 2004)' started by jmillf, Jan 13, 2019.

  1. jmillf

    jmillf New Member

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    heyo...

    VY SS installed new 1 7/8 extractors with 3" cats over the weekend, starts fine, idles fine, normal driving fine but when under load or accelerating hard there is a slight hesitation and exhaust pop/crack.

    Any thoughts, exhaust leak, coils, plugs? Anyone else experience this?

    Cheers
     
  2. lmoengnr

    lmoengnr Well-Known Member

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    Are all the plug leads clear of the headers?
     
  3. delcowizzid

    delcowizzid on holiday

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    Did you take the plugs out to install the headers or just bang them into the plugs and crack one or 2 lol
     
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  4. jmillf

    jmillf New Member

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    Plugs came out and leads all clear of header pipes. Mind you due to the size of the primaries they are close. FYI they are ceramic coated.
     
  5. mechanic

    mechanic Member

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    Air leak into the exhaust. You have a leaking gasket.
     
  6. jmillf

    jmillf New Member

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    Idles fine runs fine under normal running. Took it for a drive tonight, now it’s hesitating or stuttering when under load low revs.

    Does that still sound like symptoms of a header leak?

    Cheers for the feedback.
     
  7. 07GTS

    07GTS Well-Known Member

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    have u checked header bolts again after a heat cycle as the gaskets can move and u have to do them up again, also check bolt length into the head ive found some bolts can be tight but its because they are bottoming out in the head so dont actually tighten the headers up
     
  8. jmillf

    jmillf New Member

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    No haven’t checked header bolts. Will recheck torque on bolts tomorrow. That’s interesting, I used the same header bolts. Interesting to see if the flange thicknesses are different between the stock headers and the aftermarket.

    Thanks for the info. Keep it coming!!!!
     
  9. vr304

    vr304 Well-Known Member

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    If you find no mechanical issues like exhaust leaks etc you may possibly need a tune, also those leads are very easy to break when taking them off the coil end perhaps you’ve damaged 1 or 2 taking them off
     
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  10. jmillf

    jmillf New Member

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    Possibly, is there any way to test or inspect coil condition. I have read of an example where you start the car in the dark and check for arcing?
     
  11. vr304

    vr304 Well-Known Member

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    Not sure mate but probably, it’s not the coils but the leads on the end that go on to the coil that are easy damaged when removing
     
  12. jmillf

    jmillf New Member

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    Anyone seen this clip, pretty interesting!

     
  13. 07GTS

    07GTS Well-Known Member

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    just use multimeter on ohms at each end of lead just wriggle it around and pull it tight and u will pick up and failed leads quickly
     
  14. jmillf

    jmillf New Member

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    Righto, checked torque of all header bolts. All good 25 Nm.

    Took off all leads and inspected. There was some what looks to be plastic debris in the coil side plug. Had to fish out with tweezers see photo.

    Interesting when putting the leads back on; on two of the leads at the spark plug didn’t make the distinct click which the others did. I did feel around the hole and feels like the header flange is very close to the spark plug hole. Maybe the metal heat shield of the coil is hitting the flange stopping thread from engaging all the way onto the spark plug. Took it for a drive still some popping on hard acceleration and does feel bit sluggish. Idle is still ok though.

    Might get one of those Kincrome OBD11 scanners to see if it’s thrown any codes. Anyone have experience with these worthwhile?

    See if I can get a multimeter from work tomorrow and check.

    Cheers guys. Keep the suggestions coming. Appreciate it!
     

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  15. vr304

    vr304 Well-Known Member

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    If I were you mate I’d just go buy a new set of leads and be done with that way you know they are good for another 100k kms
     
  16. jmillf

    jmillf New Member

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    Good call mate. Will do. Also might try using high temp lead protectors as opposed to the steel heat shield. The protectors look to be a smaller diameter than the heat shield. Hopefully get a better clamp on to the spark plug on the two suspect leads.

    Ill keep everyone updated.

    Cheers
     
  17. mechanic

    mechanic Member

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    Nah, exhaust leak won't cause hesitation.
     
  18. jmillf

    jmillf New Member

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    Ok update, took the heat shields off the two suspect plugs and 'clicked' them back in position and went for a drive. No hesitation, no spluttering or popping when under full acceleration or low revs in high gear which Is great. Might of found our culprit. It's interesting to see score/damage mark said on the metal shields where it looks like It was binding on the header flange. Good result. Still feels somewhat sluggish though (maybe it's the big pipe). Took Dad for a drive and he doesn't seem to think so......

    Anyway going to get some high temp lead protects and use them instead of the metal shields.

    Thanks for the suggestions. Next up OTR and MAFless tune
     
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  19. vr304

    vr304 Well-Known Member

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    Once you get your otr and tune it will make a big difference in power and torque mate it frees them up nicely
     
  20. jmillf

    jmillf New Member

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    Looking forward to it! Anyone have experience with LSX Garage in Hallam Victoria?
     

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