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 Jerold Howland |
00 topkick 6500 series fast idle shutting down? |
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Posts: 711 01/01/2009 14:26
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3126 cat,manual,I push the button in and fine,sometimes it will only work for a minute other times ten minutes?
I have checked all the fluids thinking maybe low fluid sensor but no luck,any suggestions? |
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GnadFly |
#1 | |||
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Posts: 7 01/01/2009 15:35 |
Might want to check your brake light switch. I'm not sure if there's any adjustment on them or not...but I'd check the connections as well as
making sure that it's still mounted securely. I know on my 03 6500, all it takes is an ugly look at the brake pedal and the darned thing idles down..
Internally, the switch seems to be really sensitive in that any kind of movement opens the circuit and down go the RPMs....and YES it *does* get frustrating ...Grrrr! If all is well there, check the brake pedal at the pivot point. It might be worn causing the switch to activate. Good Luck. Hope this helps. |
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Jerold Howland |
Thank you.. | #2 | ||
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Posts: 712 01/01/2009 15:59
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When I have the truck next I will check,and it seems to me that we have a 550 with the same type of issue and I will check.Again I say thank you for the quick
response especially on a holiday.
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GnadFly |
#3 | |||
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Posts: 9 01/01/2009 19:27 |
You're more than welcome, Jerold. Just trying to do my part to give back to the community whose been an absolute wealth of knowledge.
(there's some pretty smart peeps here) But I've had 3 of these trucks (w/Allison trannies) and if my clumsy foot happened to slightly brush against the brake pedal, or sometimes just when loading the deck, the bumping around would sometimes jar it enough to disengage the fast idle. So that's where I'd start the hunt. Good luck and I hope it helps. John |
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 bigslim101 |
#4 | |||
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Posts: 1246 01/01/2009 21:10
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I had problems on the same kind of truck with the switch itself, look on the back of it and see if its coming apart.
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firemedic |
#5 | |||
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Posts: 650 01/02/2009 19:29
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I have a 2000 GMC 6500 that has the button just left of the steering wheel. Check your brake pedal but also check your clutch. If you look under the dash at
the clutch pedal there is a switch to let the computer know the clutch is pressed. If you have a little slack in the clutch pedal it doesn't engage. A
quick check is to hold the clutch up and check your high idle button. If that does it you can adjust the clutch cable or unplug the switch and either jumper
the switch or a little cruder method I seen on another truck is to take the switch out and tape it closed that way it appears that the clutch is pressed all
the time.
Hope this helps. |
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Mogg |
#6 | |||
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Posts: 71 01/05/2009 09:01 |
Even cruder,,,,,,,long bungee around both brake and clutch up to steering wheel. Worked like a charm,, lol.
Also while your poking around and checking, is your clutch adjusted properly? While your down there greasing the pivots on bellhousing and throwout bearing in bottom of trans lube up all pivots on pedal side as well as where cable attaches to bell housing. There is supposed to be a pull back spring on side of trans for clutch linkage if yours is gone go order up a few as they break often but all these things combined could be reason as to why the switch is disengaging. I personaly put 270k on mine and did all my own repairs,, so I have learned a thing or two about that truck. Its a GREAT truck. Bill LeGates
Last Edited By: Mogg 01/05/2009 09:06.
Edited 1 time.
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