Question about 2005 MBK Ovetto

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Engine power increasing and decreasing on full trottle

Power surges and then slows down

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Posted on Jan 17, 2013

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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!

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1 Answer

How to increase my nokia n70's internet connection & how to increase my headset's volume?


you may want to try this:
#3370# - Enhanced Full Rate Codec (EFR) activation. Increase signal strength, better signal reception. It also help if u want to use GPRS and the service is not responding or too slow. Phone battery will drain faster though.

for the headset volume, if your headset is the type that has volume controls or, check the side panel of your phone, try pressing arrow up to increase volume, arrow down to decrease, or go to the settings of your phone, look for headphones then volume

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Can my muffler make my car run slower and shake?


CLOGGED FUEL FILTER OR WEAK FUEL PUMP CAUSE CAR TO HAVE LACK OF POWER AND SURGE.CHANGE FUEL FILTER,CLEAN FUEL INJECTORS WITH CAN SEAFOAM BY ADDING TO 3/4 TO FULL TANK OF GAS.CHECK FUEL PRESSURE SHOULD BE 41 - 47 PSI FOR 2.0L OR 3.1L ENGINES AND 9 - 13 PSI 2.2L TBI INJECTION SYSTEM.IF FUEL PRESSURE GOOD CHECK TRANSMISSION FLUID LEVEL.FAULTY TORQUE CONVERTER WILL CAUSE LACK OF POWER AND ENGINE SURGE.A STOPPED UP MUFFLER OR CATALYTIC CONVERTER WILL TAKE SLOW CAR DOWN MAKE IT SPEED UP SLOW DOWN SPEED UP SLOW DOWN.

Mar 05, 2011 | 1992 Chevrolet Cavalier

1 Answer

How to adjust idle on 94 eclipse


you should be able to adjust it by the trottle cable check under the hood and see if theres not two nuts holding your trottle cable in place if so ajust if need be. this is a easier way to increase your rpm at idle but you shouldnt be able to decre your rpms at idle this way. for that yu may have to look and see if there is a adjustment screw on your trottlebody that can increase and decrease your rpm at idle. if your have a low idle problem try cleaning the inside of your trottle body really good with a lint free rag and some trottle body cleaner also try cleaning your idle control vavle if cleaning your trottlebody didnt help.

Jan 22, 2010 | 1994 Mitsubishi Eclipse

1 Answer

Engine makes noise when driving


Are you sure it is the engine. Try putting in neutral as you are slowing down. If the noise is still there then it sounds like a wheel bearing failing

Dec 07, 2009 | 2002 Cadillac Deville

1 Answer

The engine rpm's increase and decrease when in


Does your van have the V-Tec engine? If it does, you will have to take it to a dealer to get it fixed. What is happening is one or more of the solenoids under the valve cover is malfunctioning. The result is the surge in rpm's and the rough transition. You could try an indy mechanic but any mech worth his salt will tell you to take it to the dealer.

Oct 28, 2009 | 2003 Honda Odyssey

1 Answer

BMW 316i KEEPS STALLING WHEN SLOWING DOWN AT JUNCTIONS


at the engine, there is a small sensor that helps increase or decrease the rpm of the engine. Perhaps yours is soo low, that when you slow down, it's almost about to stop.

The other problem could be the airfilter sensor. If it's not properly fixed or if the sensor itself is a bit damaged, than the engine is not getting enough air and so, let's the engine almost go off.

Please give further details if this has not helped.

thank you

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1 Answer

Oil pressure gauge increases from half to 3/4 when i accelerate, any ideas?


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