Question about Chevrolet HHR

1 Answer

At 40 mph the car will surge up and down even if you hold the gas pedal still. if you slow down or speed up it stops surging this is on a 2008 chevy hhr

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 120 Answers

Try cleaning the MAF sensor this may help. the MAF cleaner can be purchased at autozone for about eight dollars and only takes about ten minutes worth a try.

Posted on Apr 06, 2011

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

This engine has a surge; AT 35-45mph,it's a bit more prounounced, not as bad, but still there at 60mph. As the tach goes up some, then down, so does the motor, up then back down, etc.Any ideas?


About 73,200 results (0.82 seconds) Search Results

    Surging While Driving Between 40 and 50 MPH : Chrysler ...

    repairpal.com > Problems > Chrysler > Town & Country
    Around 35 mph (common street speeds) the engine will sometimes surge with noticeable tach fluctuations. ... I have a surge when coasting around 40-45 mph.

    Enginge surges RPMS drop while driving [Archive] - Chevy ...

    forums.trailvoy.com > ... > OEM Issues

    Mar 17, 2012 - 19 posts - ‎7 authors
    [Archive] Enginge surges RPMS drop while driving OEM Issues. ... I so hope somebody has a clue as to what is causing my '02 Envoy's (182k) engine to ... I'll be driving and when I get up to around 35 - 45 MPH sometimes my ...

    Hesitation and bucking on acceleration - F150online Forums

    www.f150online.com/...engines/476391-hesitation-bucking-acceleration....

Feb 09, 2016 | Cars & Trucks

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

2008 ford focus surges


run fault codes to determine why the transmission is staying in gear and not down shifting as the speed slows. Check for TCM problem. If nothing shows then have a pressure test done to determine if there is a mechanical fault in the box

Jan 24, 2014 | 2008 Ford Focus SE Sedan

2 Answers

I have a 2000 chevy blazer with a 4.3 vortec motor,my problem is when i'm cruising at a steady speed the engine surges it usually happens around 45-50 mph


ENGINE SURGING COULD BE WEAK FUEL PUMP, STOPPED UP FUEL FILTER,BAD TORQUE CONVERTER SOLENOID OR TORQUE CONVERTER. OR FAULTY TPS.

Dec 30, 2010 | 2000 Chevrolet Silverado

1 Answer

Car surges when stopped at traffic light or stop sign. This is a 1998 galant.


You are probably having problem with your Idle Air Control Valve (IACV). It can rev your motor up to the point where you are driving down the road at 40-50 MPH with out touching the gas pedal. Fortunately, unlike that other brand,you can use your brakes to slow back down. If the new part is too expensive($435 on the 2003 Lancer) you should be able pick a good one up at the salvage yard cheap. The IACV for most cars new sells for $25 to $50.

Sep 12, 2010 | Mitsubishi Galant Cars & Trucks

1 Answer

Speedometer surging. actual speed 40 mph,


Its a loose connection on the speedo cable. its a b*tch to get to. I had the same problem on my truck, it would fluctuate in 5th gear on the highway. i spent the money and had a professional do it.

Aug 09, 2009 | 1990 Cadillac Allante

1 Answer

Surges or bucks at steady speed, 40 to 50 mph


change fuel filter have injection system cleaned

Mar 11, 2009 | 1996 Chevrolet S-10 Pickup

1 Answer

Car sputters in wet conditions


spray some wd 40 on wires to get the water out and then spray them with some silicone

Dec 10, 2008 | 2006 Chevrolet Aveo

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

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

377 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75077 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7768 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...