No Power 40 MPH and Above........

Asked by Mar 29, 2007 at 11:46 PM about the 1999 Chevrolet Silverado 1500 3 Dr LS 4WD Extended Cab SB

Question type: Maintenance & Repair

0 - 40 acceleration is decent.

As Soon as the truck hits 40 mph you can feel a Huge drop in power / rpms, they will settle in about 1500 and even with a 3/4 quick acceleration, the truck jumps like it wants to take off, but right away kills down to that 1500 rpms, and you can not get any acceleration until you put the truck Full Throttle.  Any Ideas ?

6 Answers

50

It could be a choked up catalytic convertor or exhaust system.

0 out of 1 people think this is helpful.
Best Answer

I have 3" aftermarket exhaust installed on the truck. It was installed without Mufflers, but the GM dealer told me that, that is what is causing the problem. So I put high-end muffler back on, and problem still exsists. Could it be something in the TPS, or CPS ?

435

sounds like a tps problem to me, except for decent acceleration until 40. i would definately have a shop put a scope on the tps tho, it takes like 4 minutes

35

my truck doesnt have any problems like that... its smooth all the way through, but it could be somethin to do with the engine programing... ive got a hypertec ecu and it makes the truck sooooo much better

355

it accelerate fine till 40 mph? and then at WOT does it accelerate like WOT or slow?

355

not a tps issue if it is accelerating fine until 40

Your Answer

Add photo

Related Questions

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 174,975 nationwide Silverado 1500 listings starting at $1,250.

ZIP:

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 2,200
#2 Rowefast
Rowefast
Reputation 1,840
#3 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,630
View All

Related Models For Sale

Used GMC Sierra 1500
806 Great Deals out of 67,884 listings starting at $2,484
Used Ford F-150
2,178 Great Deals out of 206,277 listings starting at $1,499
Used Dodge Ram 1500
463 Great Deals out of 11,092 listings starting at $700
Used Toyota Tundra
455 Great Deals out of 34,064 listings starting at $3,200
Used Toyota Tacoma
523 Great Deals out of 40,493 listings starting at $2,495
Used Chevrolet Tahoe
565 Great Deals out of 28,965 listings starting at $1,699
Used Chevrolet Camaro
218 Great Deals out of 30,798 listings starting at $1,217
Used Ford F-250 Super Duty
334 Great Deals out of 46,759 listings starting at $1,895
Used Chevrolet Silverado 2500
7 Great Deals out of 265 listings starting at $3,488
Used Ford Mustang
461 Great Deals out of 45,641 listings starting at $1,999

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
82 Great Deals out of 122,943 listings starting at $19,843
2016 Chevrolet Silverado 1500 For Sale
129 Great Deals out of 5,655 listings starting at $18,895
2015 Chevrolet Silverado 1500 For Sale
186 Great Deals out of 7,345 listings starting at $12,950
2014 Chevrolet Silverado 1500 For Sale
239 Great Deals out of 10,228 listings starting at $10,900
2013 Chevrolet Silverado 1500 For Sale
134 Great Deals out of 4,953 listings starting at $7,650

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.