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Thread: My Marauder will not upshift from 1st or 2nd gear when at full throtttle; Help

  1. #1

    My Marauder will not upshift from 1st or 2nd gear when at full throtttle; Help

    2003 Marauder will not upshift from 1st or 2nd gear when at full throtttle. It just maintains 5500rpm in 1st or 5000rpm if in 2nd gear. In order to get it to upshift I must reduce throttle position to about 1/2 throttle or a little less.

    I replaced the MAF and have tested with the air cleaner on and off with no difference. I also replaced the coil packs last year, thinking it might help. It did not help.

    The car and engine operate normally except at full throttle. The transmission downshifts normally. Only the full throttle upshift is abnormal. The check engine light is not illuminated.

    I also had the transmission fluid changed just to see if it would fix the problem; it did not. I just checked the trans fluid level and it is a bit high at the top of the hash marked area on the dipstick.

    Has anybody had this problem or have a suggestion as to where to investigate next?

    Thanks
    Last edited by johnjamis; 02-21-2019 at 02:24 PM.

  2. #2
    Join Date
    Jun 2017
    Location
    Oxford, PA
    Posts
    459
    maybe you have a vacuum leak, would explain why it shifts at light throttle ok.

    take it to a transmission shop have them drive it. How many miles are on it?

  3. #3
    The car has 122,000 miles.

  4. #4
    Join Date
    Nov 2009
    Location
    Ontario Canada
    Age
    53
    Posts
    412
    Do you have a spare throttle position sensor you can try? Does the up shift issue occur in the 2 - 3 shift at full throttle as well?
    1987 GN running 10's. 2003 MM Blue Sold and dearly missed!
    2003 Black 300B
    Procharger P1sc with air to air intercooler
    3,000 PI converter
    4.10 Eaton posi 31 spline carrier
    Moser 31 spline axles
    Koos headers, with custom stainless exhaust, Megs tips
    Carbon fiber drive shaft
    Metco control arms
    Every autometer procomp gauge in the catalogue

  5. #5
    I will look for any vacuum leaks.

    I will also look at the throttle position sensor. An OEM TPS sensor is only $30, so I will just replace it and hope for a fix. I will report back.

    The up shift issue does also occur on the 2 - 3 shift at full throttle. The engine power/rpm goes flat at 5000rpm and does not upshift to 3rd gear until I reduce throttle to about 1/2.
    Last edited by johnjamis; 02-22-2019 at 08:35 AM.

  6. #6
    Join Date
    Jun 2017
    Location
    Oxford, PA
    Posts
    459
    Any chance your tune is acting up? ---go back to stock tune and see if it shifts OK

  7. #7
    I replaced the MAF sensor and the Throttle position sensor, with no change to the problem.

    It runs totally normal other than the full throttle no shift issue.

    Thanks for the suggestions.

  8. #8
    Join Date
    Nov 2014
    Location
    KC
    Age
    48
    Posts
    3,511
    Drop the pan, inspect the filter. Maybe broken oring on a tv valve.. might be pieces in the pan to help identify what the main issue is
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

    Current marauders
    04 DTR totaled JUST NOW starting to part out 7-21-2021 https://youtu.be/REUxjP1BVpg

    04 Silver Birch Dark Charcoal Hardtop Whipple Supercharger
    04 Silver Birch Dark Charcoal Hardtop V2 Supercharger
    04 Silver Birch Dark Charcoal Converted
    03 DBP Light Flint #122
    03 DBP Dark Charcoal #232
    03 Silver Birch 300b Light Flint Going to fix er up
    03 Black 300a
    04 Silver Birch Dark Charcoal moonroof in the works

    04 Heaton Swapped DTR
    Joe's Wrecked DTR rebuild thread

  9. #9
    Join Date
    Nov 2014
    Location
    KC
    Age
    48
    Posts
    3,511
    Does the car just bounce off the rev limiter?
    What rpm does it go up to and your saying it doesn't shift?
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

    Current marauders
    04 DTR totaled JUST NOW starting to part out 7-21-2021 https://youtu.be/REUxjP1BVpg

    04 Silver Birch Dark Charcoal Hardtop Whipple Supercharger
    04 Silver Birch Dark Charcoal Hardtop V2 Supercharger
    04 Silver Birch Dark Charcoal Converted
    03 DBP Light Flint #122
    03 DBP Dark Charcoal #232
    03 Silver Birch 300b Light Flint Going to fix er up
    03 Black 300a
    04 Silver Birch Dark Charcoal moonroof in the works

    04 Heaton Swapped DTR
    Joe's Wrecked DTR rebuild thread

  10. #10
    It revs up to 5500 in 1st gear and seems to go flat on power there and will not upshift.
    Last edited by johnjamis; 11-13-2021 at 03:36 AM.

  11. #11
    Join Date
    Feb 2017
    Location
    New Orleans, LA
    Posts
    262
    Quote Originally Posted by Agent2006 View Post
    Any chance your tune is acting up? ---go back to stock tune and see if it shifts OK

    x2, take out as many variables as you can

  12. #12
    I wonder if I could have an obstruction in the exhaust that is causing the high rpm power loss that does not allow the transmission to reach "shift conditions". Maybe a blocked up CAT?

    Thanks for the suggestion.
    Last edited by johnjamis; 11-13-2021 at 03:36 AM.

  13. #13
    Join Date
    Jun 2011
    Location
    Northeast OH
    Posts
    7,999
    The tune is on a chip, not tuned that way today, it was the way back then. Rheinshart is gone, pissed alot of folks along the way.
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  14. #14
    Until this issue, the marauder has been working perfect for 15 years.
    Last edited by johnjamis; 11-13-2021 at 03:37 AM.

  15. #15
    Join Date
    Oct 2003
    Location
    Beaufort, SC
    Posts
    7,719
    It won't hurt to try this since you've had the PCM out before!!

    Disconnect the negative battery terminal then unplug all electrical connections on the PCM looking for corrosion.....if you find some corrosion clean it up and re-lubricate the connector(s) and hook 'em back up!!

    Reconnect the negative battery terminal and see what happens!!

    Good Luck!!
    No Marauder

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