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Thread: LS1 - Heavy Surging (Undriveable)

  1. #31
    Look behind you... Milkman Don's Avatar
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    Maybe call a priest?
    Quote Originally Posted by Faux Forg View Post
    I agree with Rdyno

  2. #32
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    Is this drive by wire or cable throttle?

    I've had other cable throttle GM's do this sort of thing when the TPS had a bad spot in it at idle/right off idle, and also had small vacuum leaks do this. The vacuum leaks cause the idle control motor to not have good control of the idle air volume, and in some cases causes a surging idle that goes away if you add a little throttle. The bad TPS doesn't go away with slow or steady state throttle, but sometimes free-revved OK.

    Just stuff to look at-do you have a scan tool to plug up?

  3. #33
    Registered User [TUFFVQ]'s Avatar
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    Good advice re: TPS. I'll order one in any case, should be a cheap check.

    Edit: CTS and TPS Ordered
    Last edited by [TUFFVQ]; 13-12-17 at 01:55 PM.

  4. #34
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    You know you can check those things with a scan tool to negate buying them right?

  5. #35
    Registered User [TUFFVQ]'s Avatar
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    Yep - but I have no issue with putting new items into the car, as it's done 210,000km and I like reliability (which I currently don't have).

  6. #36
    Registered User [TUFFVQ]'s Avatar
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    This is about the time Ben says "I told you so".
    I downloaded a different app for my OBDII dongle which showed better data, TPS looks fine, CTS also.
    MAF grams per second looked good also. Only thing that looked kinda weird was the voltage readings on the O2 sensors but honestly I'm not sure if it's normal or not.
    I think I have to swallow my pride and take it to a workshop...

  7. #37
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    And I assume that app doesn't give the error codes that point to a problem?

    In the US we have OBDII, I assume AU is similar-so you don't have, for example, a P0300 or P2135? This type of scan tool is what the shop is going to charge you 100$ a minute to use, and they literally are just going to do what the code says to do after they spend 30 seconds plugged in.

  8. #38
    Registered User Stix Zadinia's Avatar
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    Quote Originally Posted by Xnke View Post
    And I assume that app doesn't give the error codes that point to a problem?

    In the US we have OBDII, I assume AU is similar-so you don't have, for example, a P0300 or P2135? This type of scan tool is what the shop is going to charge you 100$ a minute to use, and they literally are just going to do what the code says to do after they spend 30 seconds plugged in.
    we don't have such stringent rules with OBDII and diagnostics in general - for example, 90's falcons use an OBDII style plug but the protocol is some proprietary Ford one

    will be interested to see what your mechanic turns up
    Quote Originally Posted by Smidge View Post
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  9. #39
    Registered User [TUFFVQ]'s Avatar
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    Scanner said not faults logged.
    Really unhelpful.
    And it seems as though the battery may have died this afternoon. I could hear the solenoid click but nothing happened. Changed out the battery with a smaller one and another jumped onto it and it eventually turned over. Needs more investigation tomorrow.
    This car is cursed...

  10. #40
    Chopped BigMuz's Avatar
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    If you've done all the obvious stuff you've already done what nearly every mechanic will do unfortunately.
    Retard Honour Wall.
    Quote Originally Posted by Sloth View Post
    Rob Sloth Young did i ask for your opinion? no. i only want it for a paddock bomb. go play with traffic.
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    you stupid fucken imbicle.
    Quote Originally Posted by Fondles
    your are a fucken idiot of the highest level.

  11. #41
    Registered User GreatWallGT500's Avatar
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    torque converter or trans.

    this page I stumbled across mentions something about surging and poor acceleration

    #4
    https://www.doityourself.com/stry/5-...rque-converter

  12. #42
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    I'd rip the injectors out first. Should be able to get them checked and cleaned for about $250 (ideally check fuel pressure at the rail first). You'll probably spend half that just getting it towed to your mechanic of choice. Only takes 5 minutes to rip them out too.

    If it was the torque converter locking up or fucked enough to bind up internally, it would bog down when held on the brakes, but more or less drive "ok". If it was the auto it would drive shit, but wouldn't be able to load it up enough to stall at idle because the converter would just slip.

  13. #43
    Registered User [TUFFVQ]'s Avatar
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    Thanks for the patience here guys.

    So I did some more fiddling tonight, checked alternator and it's putting out 14.4V at battery. Changed out coolant temp and no change (clearly) but it was broken.
    Tried to check for audible vacuum leaks without success. It's surges and (often) stalls in drive or reverse but not neutral or park (though is a bit doughy on free rev). Idle and free rev quality (vibration) is fine in that it doesn't seem like it's missing or bucking until in gear. Not sure if a video would help?
    Anyway, I'll throw the TPS replacement on when it gets here for fun.

    Checked the auto trans level too, when cold it's at the top of the hot fill level. Clearly I'll need to attend to that also.

    Will chase up an injector crowd and drop them off Wednesday if I can.
    Last edited by [TUFFVQ]; 19-12-17 at 12:34 PM.

  14. #44
    Registered User [TUFFVQ]'s Avatar
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    Quote Originally Posted by Ben. View Post
    ....(ideally check fuel pressure at the rail first).
    So being new to LS Engines, the Schrader valve on the rail cane be used? Any recommendations on a removable gauge or should I just ghetto something up? (Or use google better? Haha)

  15. #45
    are hairy Dogsballs's Avatar
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    It's like the idle isn't set right and when in gear/loaded it shuts the bed

    I severely doubt it's injectors.

    Need to get a proper scan tool on it and see what codes it shoots

    Vac leak would make it idle higher
    Quote Originally Posted by 50RTD View Post
    Dave, have you uploaded the data from the carby?

  16. #46
    Registered User [TUFFVQ]'s Avatar
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    Video of the issue. Replaced the TPS tonight which initially improved free-rev response, but as you can see in the video it didn't take long for it to fall over worse than before.
    Apologies for just about the worst demonstration video of all time.
    The main part is the very end of the video. That surging was with constant throttle position and the jerkiness was not exaggerated.
    Last edited by [TUFFVQ]; 19-12-17 at 06:33 PM.

  17. #47
    Look behind you... Milkman Don's Avatar
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    Iím no expert on these things, any opportunity you can get someone to throw a laptop on it and see what itís doing. You are limited in PIDs with a Bluetooth dongle, Efi live or HP will pickup if the ecu is commanding weird things or maybe is cooked.

    where in melb are you? Got a mate in Macedon thatís mucked around with the Holden crosstrak system pretty extensively. Could maybe be a correlation of the system to the ecu. Pull the traction control fuse out see what it does
    Quote Originally Posted by Faux Forg View Post
    I agree with Rdyno

  18. #48
    Registered User [TUFFVQ]'s Avatar
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    Out west near Werribee.
    Assume that's Ian with the Lexcen?

  19. #49
    Look behind you... Milkman Don's Avatar
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    Quote Originally Posted by [TUFFVQ] View Post
    Out west near Werribee.
    Assume that's Ian with the Lexcen?
    you assumed correct
    Quote Originally Posted by Faux Forg View Post
    I agree with Rdyno

  20. #50
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    Quote Originally Posted by Dogsballs View Post

    I severely doubt it's injectors.
    It was parked up for a year. No need to pay $250 to clean them, heaps of vids on youtube showing how to do it.

  21. #51
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    What's the story with its prior history - not parked up for a year by the previous owner to dry out from being lightly submerged in floodwaters I hope? (wouldn't take a lot for water ingress into the ECU...)

    Sent from my Z2 Plus using Tapatalk

  22. #52
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    Have you fitted a new throttle pedal yet? If you just can't get a proper scan tool then that's the next thing after the TPS.

    I went through this bullshit on my Canyon before I sold it and did an LS swap on it.

  23. #53
    Registered User Stix Zadinia's Avatar
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    if you're going to clean your injectors yourself you need an ultrasonic bath that does variable frequencies
    the jewellery cleaning ones are a fixed frequency and suck at it
    Quote Originally Posted by Smidge View Post
    Would bang. Did bang. Marrying that shit.
    SUNTORY BOSS is the boss of them all since 1992!

  24. #54
    are hairy Dogsballs's Avatar
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    If injectors were fucked it'd be shit at idle, not just in gear
    Quote Originally Posted by 50RTD View Post
    Dave, have you uploaded the data from the carby?

  25. #55
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    Quote Originally Posted by Stix Zadinia View Post
    if you're going to clean your injectors yourself you need an ultrasonic bath that does variable frequencies
    the jewellery cleaning ones are a fixed frequency and suck at it
    Yea they sound sort of like a cricket lol.

  26. #56
    25 schmeckles? Do the safety dance.'s Avatar
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    You need a scan tool that can view the sensor outputs live. Any decent mechanic will have one. Will be cheaper to see what's happening now rather than continually throwing parts at it hoping for the best.

  27. #57
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    Do these have a lock up converter??

  28. #58
    Registered User [TUFFVQ]'s Avatar
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    Quote Originally Posted by andy_wk View Post
    What's the story with its prior history - not parked up for a year by the previous owner to dry out from being lightly submerged in floodwaters I hope? (wouldn't take a lot for water ingress into the ECU...)
    There's all possibilities it might have been. I really don't know the history.
    Yes - I'm taking the 'parts bin' approach, only because work is precluding me from actually getting it anywhere during business hours. This should hopefully change after Christmas.
    But in any case, I bought another set of LS injectors, mainly because I want a set for my other car anyway so it's no loss to me.

    Xnke - It's a cable throttle.

    Safety dance - I agree. I've gotta line up someone nearby to do so, but at the moment I can't even get it to the mechanics without a flat bed.

    cub35 - Yes, lockup converter.

  29. #59
    Į\_(ツ)_/Į burn is weird's Avatar
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    can you put a timing light on it to check if it's ignition or fuel being the cunt?

    have to jack up the rears and load it on the handbrake to do that i guess.. not ideal

    Oo___oO


  30. #60
    Look behind you... Milkman Don's Avatar
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    Quote Originally Posted by burn is weird View Post
    can you put a timing light on it to check if it's ignition or fuel being the cunt?

    have to jack up the rears and load it on the handbrake to do that i guess.. not ideal
    The awd would see it through the garage wall too
    Quote Originally Posted by Faux Forg View Post
    I agree with Rdyno

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