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Thread: Hesitation/ surging under boost

  1. #21
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    Re: Hesitation/ surging under boost

    Will do the spark plug thing tomorrow. I just put the rod bearings in the car less than 1000 miles ago. But, even though I used the same size bearings as what were on the car, it was pretty difficult to turn over once I torqued the rod caps down.

  2. #22
    turbo addict moparzrule's Avatar
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    Re: Hesitation/ surging under boost

    Did you use assembly lube on them?

    They weren't standard?

  3. #23
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    Re: Hesitation/ surging under boost

    Quote Originally Posted by HSKR View Post
    Will do the spark plug thing tomorrow. I just put the rod bearings in the car less than 1000 miles ago. But, even though I used the same size bearings as what were on the car, it was pretty difficult to turn over once I torqued the rod caps down.
    yikes...that doesnt sound good

    why did you need to replace the old bearings? thats indicator #1....Ive opened up 150k+ miles TM's and the bearings were in great condition. did you check the bearing clearances with plastigage?

  4. #24
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    Re: Hesitation/ surging under boost

    He had an I-shaft failure, lack of oil took out a couple of journals if I recall.

    Also, here is a thread from the other site about how to properly get the lifters re-filled with oil and pump back up. Since I know that is still an issue too.

    http://www.turbododge.com/forums/f11...0-lifters.html

  5. #25
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    Re: Hesitation/ surging under boost

    Pulling spark plug wires did not change the sound at all. Hopefully that rules outnrod knock.

    And yes I changed bearings due to ishaft failure and running with out oil.

  6. #26
    turbo addict moparzrule's Avatar
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    Re: Hesitation/ surging under boost

    what lol, not just the wires, the plugs. You have to remove compression from the cylinder.

  7. #27
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    Re: Hesitation/ surging under boost

    Quote Originally Posted by HSKR View Post
    Pulling spark plug wires did not change the sound at all. Hopefully that rules outnrod knock.

    And yes I changed bearings due to ishaft failure and running with out oil.
    hmmm...Im not 100% sure what it means if there is no change if the plugs are pulled..I'm pretty sure if the sound DID change it would mean rod knock, but the other way around may not be conclusive

    try going here:

    http://onlinetonegenerator.com/

    make sure to set it to square wave

    then see what your idle rpm is

    divide by 60 and input that into hertz in the generator

    so for example 960 rpm would be 16 hertz...

    then listen to it and see if that matches the repetition rate of the knock sound

    then try half that frequency and see if that matches

    - - - Updated - - -

    Quote Originally Posted by moparzrule View Post
    what lol, not just the wires, the plugs. You have to remove compression from the cylinder.
    yeah that would probably be best..although when I suggested it I meant just the wires lol..but you're right removing the whole plug and the compression would be better...

    - - - Updated - - -

    you could also hook up a timing light to one plug wire at a time (with them all connected) and see if the knock sound coincides with the flash...

    might want to force idle rpm as low as possible to make it easier

  8. #28
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    Re: Hesitation/ surging under boost

    Sounds like rod knock to me.

    As for ticking lifters, putting them in oil won't really do anything. You need to drive it or you have a bad one. I had a few tickings ones that would not go away. Ended up taking them apart, full of crud and pieces of the retainer, put them back in, nice and quiet.
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  9. #29
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    Re: Hesitation/ surging under boost

    Well, it was most definitely rod knock as #3 rod broke today.

  10. #30
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    Re: Hesitation/ surging under boost

    Quote Originally Posted by HSKR View Post
    Well, it was most definitely rod knock as #3 rod broke today.
    DAMN!

    I guess no further diagnostics needed.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  11. #31
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    Re: Hesitation/ surging under boost

    Will these work in the T3 motor? http://www.fwdperformance.com/Store/...&ProductID=255

    - - - Updated - - -

    Or maybe a better question, how much extra do you need to do if I was going to swap the 2.5 short block out of my Daytona into the Spirit and run the Lotus head on it?

  12. #32
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    Re: Hesitation/ surging under boost

    Link no workie.

    To run a 2.5 with a Lotus head, the compression will be too low, and you'll have to plug the dizzy hole. You'll need to run all the TIII stuff, IE water pump, crank gear etc and of course, you'll need a new calibration.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  13. #33
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    Re: Hesitation/ surging under boost

    The link was for the FWDP TII Connecting rods. The only ones they have listed for the TIII were $450 H-beams. Vs the $250 shot peens TII rods.

  14. #34
    turbo addict moparzrule's Avatar
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    Re: Hesitation/ surging under boost

    The rods are the same I'm 90% sure.

    <edited>
    Last edited by Frank; 11-14-2014 at 10:54 PM. Reason: PM'ed

  15. #35
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    Re: Hesitation/ surging under boost

    Come on Matt, not the time or place.

    Depends what you want to do, the stock TII rods are fine for some good power, if you want to wick it up, you can't go wrong with the $450 H beam units.

    Later T1, TII rods and TIII rods are the same except TIII rods got stronger rod bolts.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  16. #36
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    Re: Hesitation/ surging under boost

    So I could do the TII rods with ARP bolts and be good? Just need to figure out what pistons are in the car exactly cause they aren't factory.

  17. #37
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    Re: Hesitation/ surging under boost

    STOP.

    WHY DID YOUR ROD BREAK.

    That is question #1 before you go buy new rods. Sheesh. Nobody is blinking at eye at a rod breaking? WTF? How much engine chaos can occur before we start figuring out why before buying replacement parts?

    Im betting it has something to do with whatever killed your I-shaft. Things are not looking good inside that engine.

  18. #38
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    Re: Hesitation/ surging under boost

    You'll have to do custom pistons to make up for the change in compression. Might want to search Cliff Ramsdell's 2.5 T3 wagon out. He had detonation issues, not sure if he ever got it under control. Made huge torque at low rpms.

  19. #39
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    Re: Hesitation/ surging under boost

    Quote Originally Posted by acannell View Post
    STOP.

    WHY DID YOUR ROD BREAK.

    That is question #1 before you go buy new rods. Sheesh. Nobody is blinking at eye at a rod breaking? WTF? How much engine chaos can occur before we start figuring out why before buying replacement parts?

    Im betting it has something to do with whatever killed your I-shaft. Things are not looking good inside that engine.
    I'm not just going to replace rods and slap it together. Crank is damaged so will have to be taken into machine shop at minimum. So engine is coming apart and I can inspect it to figure things out. No need to get all worked up.

  20. #40
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    Re: Hesitation/ surging under boost

    Quote Originally Posted by HSKR View Post
    So I could do the TII rods with ARP bolts and be good? Just need to figure out what pistons are in the car exactly cause they aren't factory.
    Correct a moondo. Have you got it apart yet? Did it window the block?

    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

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