1999 Mercury Cougar Logo
Posted on Oct 15, 2009
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Car gets warm and starts hesitating on acceleration

Car runs fine when cold but as i drive, within 15 minutes or so, the car gets warm and starts hesitating on acceleration and runs sluggishly. What could be the problem?

  • Anonymous Mar 26, 2014

    When accelerating, the engine hesitates, almost like it stops firing for a split second. Stalled out once.

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  • Posted on Oct 15, 2009
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Hi,
this could be something in the fuel pump. As the cold motor draws more fuel, it may just be just ok for the engine, but after it is warm, it draws less and may "suffocate" it that way. Same goes for air filter, take a peek if it is not ready for replacement. Has this happened suddenly, or has it occurrend during a long perion of time?

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  • Posted on Oct 23, 2009
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My car wont honk i cant find the correct fuse can you help me find it

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Powertrain light came on in the morning and car would not rev. Very cold and turned off and back on and ran fine.

Wrench light on ? DTC'S - diagnostic trouble codes stored ! Problem with electronic throttle control . Your best bet , take it to a qualified repair shop .
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Toyota Celica hesitates at cold start everyday

You know that you have a boost sensor I know you said MAF sensor, but some make and engine size has a boost sensor when this sensor goes you lack power as you described. so make sure this sensor vacuum hose is hooked up it also acts as a MAP sensor. give fuel when you accelerate
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The car will run fine for about 10 minutes then it will stop accelerating???

ENGINE HESITATES WHILE ACCELERATION

LOSS OF ACCELERATION


It can be fuel pressure issue or it's the problem with accelerator pedal or its clogged filters causing there.

There are many other possibilities. I suggest you to go through the list of help links mentioned below, these will help you to confirm where the actual fault lies: -------

Jerks and Hesitates During Acceleration?

http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html

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Loss of acceleration?

http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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Headlights flickering and car hesitates to start?

http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

--------

How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

-------------

How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html

---------

2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?

http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html

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Wheel hop under hard acceleration?

http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html

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2009 Chevy impala accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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These details will help.

Thanks.

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Mitsubishi Pajero/Montero/Shogun 3.0 v6 Running poorly when cold

sounds like it has jumped timing you'll need a mechanic or see your dealer
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Acceleration problem

possibly camshaft position sensor in the distributor, or weak fuel fump starts acting up when warm, or throttle position sensor. heat has a effect on sensors and electrical components in some weird and hard to find ways.
1helpful
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Oil pump at idle is good when car is warming up, but after it get real warm after 20 miles of driving the idle oil presure is low about 15 lbs


  • This is normal. On your car, on a cold start the pressure will be around 75 PSI. After the engine warms an oil pressure of 15-20 PSI at idle is just what it should be. The oil pressure gauge should escalate when accelerating up a bit to. If your old school like me 15 PSI mean danger but tat Caddy is just fine.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony
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1answer

Frequently will crank but not start

the problem must be with the batteries. check the voltage levels of the battery using a voltmeter. if it goes lower that 10v and fast dying, then replace them. and also check the alternator charging the battery for any charging problem.
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