Question about 2008 Chevrolet Silverado 1500 2WD

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Engine surge on slow acceleration

At slow to normal acceleration, the engine surges to a high RPM without shifting out of first gear, then eventually shift into second gear at about 3500 RPM's.

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  • Chevrolet Expert
  • 162 Answers

Check tranny fluid level,if good,either pump in tranny is bad or cluthces in tranny is gone bad,how many miles?

Posted on Apr 15, 2014

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6ya6ya
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Posted on Jan 02, 2017

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junkman1249
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SOURCE: Engine RPM too high when transmission shifts. Bangs into gear.

check your fluid level when the car is warmed up

Posted on Dec 05, 2008

  • 1 Answer

SOURCE: s10 blazer surges

might wanna check intake gasket for leaks on the high engine rev as for tranny might be in the comp

Posted on Dec 07, 2008

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

iambanshee74
  • 3489 Answers

SOURCE: Engine gets to a high RPM before it shifts

check all vacuum starting at the pump on these mpodels and see if you are getting around 29" of vacuum. if you are not this is your issue. it sounds like it is doing it mechanically and not assisted. this is a very good way to destroy your transmission. it is very possible that you have a leak somewhere else in the system causing a vacuum leak. i am guessing all your door locks do not work.email me at iambanshee74@yahoo.com

Posted on Nov 02, 2009

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Buick Lesaber, Lower then 1800rpm most time runs fine, Once in while surges high rpm's like driving fast 1900 & above rpm bucks /2100 smooth's out.


Need to take to a shop with a GM tech 2 or higher scan tool. These tools can actually display various sensor readings and voltages in real time and can be used while driving the car to recreate the issue. These are super expensive scan tools so most shops don't have them. Call around or bite the bullet and have a dealer do it. The money you spend on a correct diagnosis will be saved by not throwing random parts at it based on guess work.

Nov 01, 2016 | 1995 Buick LeSabre

2 Answers

While driving my jeep seems to be shifting gears the rpms rev up and then goes back down almost as if surging I changed speed sensor as a guess so far but did not work?


old 1995
we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
10 min.later he wilt tell you
its trans issues.
or its engine, super easy this is driving.

seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.


stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !

or get it scanned.
and post all those DTC errors. P0700? and more.

Jan 24, 2016 | 1995 Jeep Grand Cherokee

1 Answer

Car surging


Is the car equipped with the Automatic Transmission?
If so, read on.
Otherwise skip to the end and answer some questions.

POSSIBLE SCENARIO:
I have observed a condition where my car surges slightly when the torque-converter clutch (TCC) cycles between lock and unlock when driving on an uphill grade.
First some basics and history that will explain why the TCC is used.

Engine, Torque Converter, TCC, and Transmission relationship--
The TCC allows for a solid connection between the engine and transmission which allows the input to the transmission to rotate at the same speed as the engine.
Without a TCC, there is slippage between the engine and automatic transmission. The slippage is greatest at low engine RPM. That is what allows the engine to run with the automatic transmission in gear, like when you first shift into gear or stop at a stop sign. When the throttle pedal is depressed, the engine RPM begins to increase and the torque converter begins to slip less and less the more the engine RPM increases. The car moves. But even at cruising speeds the torque converter slips slightly. Engine RPM is greater than transmission input RPM, which is realized as slight decrease in fuel efficiency.
When acceleration is complete and a constant speed is being maintained, the engine power output is reduced to the point where the TCC can engage and eliminate any slippage between the engine and transmission. If the car has a tachometer the engagement of the TCC can be verified when a slight reduction in engine RPM observed without a corresponding change in vehicle speed.
One method used to test the operation of the TCC is as follows:
Find a flat section of road where it is safe to perform the test.
Reach a steady speed and keep the gas pedal depressed with one foot. While observing the tachometer (or listening for an increase in engine RPM), with the other foot depress the brake pedal enough to activate the break light switch but not enough to engage the brakes. When the brake light switch activates, the TCC receives a signal to disengage. With the gas pedal being held steady, release the brake pedal and the engine RPM should decrease when the TCC engages.
Old cars with Automatic Transmissions did not use a TCC. I believe the TCC was put in use in an attempt to increase fuel economy.

MY EXPERIENCE WITH SIMILAR SYMPTOMS
The condition that causes that issue on my car is this:
- A slight uphill grade increases the load on the engine.
The car tends to gradually slow and it is necessary to depress the gas pedal to maintain speed.
- Depressing the throttle pedal (manually, or automatically with cruise control engaged) signals the torque converter clutch to unlock when the load increases slightly. (A more drastic load increase would signal the Transmission to downshift to a lower gear.) The corresponding increase in engine RPM and output is enough to compensate for the reduction in speed. When the vehicle speed, engine RPM, and throttle position stabilize to the point that the TCC will engage and the engine RPM will reduce in correspondence with TCC engagement. Now, if the road conditions have not changed, power output is not enough to maintain vehicle speed. With the increased load caused by full engagement between engine and transmission, and the cycle (surging) repeats itself until the road conditions change.

Does that help?
If not:

QUESTIONS
Please define the symptoms.
What are the road conditions when the surge occurs? (A slight uphill grade?)
What is the frequency of the surge?
Does the engine power output have a noticeable surge?
Is there a speed change related to the surge?
Does the tachometer move up and down with little or no change in vehicle speed?
Are all instrument indication in the normal range?
What else has changed?

Good luck!

May 24, 2014 | Subaru Impreza WRX STi Cars & Trucks

1 Answer

1999 Silverado has an engine surge of 200-500 RPM at 45 to 55 MPH


sounds a little like a cruise control problem.
they used to have a centering adjustment that kept the speed within a range. If the range somehow shifted to the high end this would cause your surge. it would be a screwdriver slot on the outside of the case.cw increase ccw decrease. yours is set too high or cw.
I work the screw back and forth several times in case dirt entered the cruise module.

Jan 30, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

When I start my 1999 honda CRV it surges to about


no the surge that high is not normal a normal cold start should go to around 1500 then settle slowly to 750 or so but this all depends on engine temp and ambient air temperature

Feb 07, 2010 | Honda CR-V Cars & Trucks

2 Answers

Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

Feb 07, 2009 | 1997 Chevrolet Astro

1 Answer

Engine surging high rpms at stop signs/lights...


the idle air control solenoid or a vacuum leak on backside of intake the hose that goes to pcv valve.they are both common problems on this car.check for vacuum leak firstthanks for your question....

Feb 04, 2009 | 2000 Ford Focus

3 Answers

Shifting problem


sounds like it may be either a converter problem or u got some bad clutches in third in the case you need to go to a tranny shop.

Jan 27, 2009 | 1998 Honda Civic

1 Answer

Surging and not shifting


change the transmission filter sounds like its clogged up. replace w/ name brand high milage transmission fluid. should fix you right up. if you take it to a shop you can ask to have the bands adjusted also, that should give you another 5- 10,000 miles on trans. maybe more. good luck

Nov 08, 2008 | 1991 Toyota Celica

1 Answer

2000 Volvo S40


one unit that operates ratio changes and is connected to the engine is that vacuum operated actuator on the transmission
it is possible that that unit is failing , vacuum hose is leaking and that will cause ratio changes as the vacuum varies
run the fault codes to check for wiring problems or VSS or TCM problems as well

Mar 23, 2017 | 2001 Volvo S40

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