lack of power - Truck Engine Repair


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lack of power

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jumper
New User

Feb 6, 2010, 12:07 PM

Post #1 of 4 (2422 views)

lack of power	Sign In

2004 gmc sierra 1500 2wd 6cyl 4.3, on the hiway uphill cant get any more power at about 55 mph it happens . in town it is fine - any suggestions

(This post was edited by jumper on Feb 6, 2010, 1:10 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 7, 2010, 4:03 AM

Post #2 of 4 (2413 views)

Re: lack of power	Sign In

Is it downshifting? Does using plain "D" instead of the overdrive "D" selection make any difference?

T

jumper
New User

Feb 7, 2010, 8:10 AM

Post #3 of 4 (2406 views)

Re: lack of power	Sign In

It only has a single D no overdrive , it does down shift and goes smothly through all gears any other time - It does it on a modest grade not just uphill

(This post was edited by jumper on Feb 7, 2010, 8:43 AM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 7, 2010, 9:30 AM

Post #4 of 4 (2397 views)

Re: lack of power	Sign In

?? Almost all automatics have a locking torque converter which feels like a fourth gear or overdrive. This probably just does it all automatically as it's rare not to lock up at certain reduced loads in high gear.

If this has full power from a stop as you expect from it but not at highway speeds it may not get the signal to downshift or unlock for more leverage (lower gear ratio) for the increased load. I can only guess so would need to know if it won't downshift at 55mph which I think it should. At over 70 most would not go to true second gear anymore as RPMs would be too high.

General loss of power would be another approach to fix,

T

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