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

325

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

325

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 149,181 nationwide Silverado 1500 listings starting at $1,500.

ZIP:

Search Chevrolet Silverado 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 1,760
#2 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,490
#3 tenspeed
tenspeed
Reputation 1,420
View All

Related Models For Sale

Used GMC Sierra 1500
1,057 Great Deals out of 58,731 listings starting at $1,599
Used Ford F-150
3,217 Great Deals out of 205,088 listings starting at $1,779
Used Dodge Ram 1500
528 Great Deals out of 13,262 listings starting at $1,800
Used Toyota Tundra
643 Great Deals out of 27,765 listings starting at $3,200
Used Chevrolet Tahoe
852 Great Deals out of 28,370 listings starting at $1,700
Used Toyota Tacoma
712 Great Deals out of 32,122 listings starting at $2,000
Used Chevrolet Camaro
475 Great Deals out of 39,921 listings starting at $3,499
Used Ford F-250 Super Duty
476 Great Deals out of 41,915 listings starting at $1,999
Used Chevrolet Silverado 2500
5 Great Deals out of 286 listings starting at $3,995
Used Chevrolet C/K 1500
1,095 listings starting at $1,895

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
57 Great Deals out of 84,402 listings starting at $20,000
2016 Chevrolet Silverado 1500 For Sale
293 Great Deals out of 12,356 listings starting at $18,657
2015 Chevrolet Silverado 1500 For Sale
348 Great Deals out of 7,277 listings starting at $14,795
2014 Chevrolet Silverado 1500 For Sale
524 Great Deals out of 11,016 listings starting at $12,888
2013 Chevrolet Silverado 1500 For Sale
300 Great Deals out of 6,347 listings starting at $8,995