Question about 2003 Harley Davidson FLSTF Fat boy

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Why is check engine light coming on and going off when it comes on runs high rpms

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Rev sensor could be going bad

Posted on Jun 21, 2009

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04 buick rainier, charge light goes off during high rpms


have the alternator bench tested for problem in regulator or rectifier. check and adjust the drive belt. Charge light should go off at at idle and remain off during whole of engine operation
if they come on at idle it means that the alternator is not producing a charge current and needs attention.

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Maybe the Throttle Position Sensor (TPS) if the computer thinks it is all the way to the floor then the gears would not shift until the engine RPM is real high. Also would not be able to determine the car is supposed to be idling. Do you have a check engine light? If you do this may come up on a scanner.

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My 1991 Buick Regal (3.1 engine) use to start a high RPMs and then slowly, as the engine warms up, the RPMs would come down to about 800, which is the normal. However a few weeks ago, it started to start...


Hi,
You need to get your engine coolant thermistor checked and tested. This is what tells the ECM when the engine temperature is at normal working temperature and turns the idle down.
But when the idle won't come down from cold to warm this is usually the main fault.
Hope this helps.
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1 Answer

I got a 1990 ford ranger 2.9 v6 its running very crappy


Fluctuating an high RPMs sounds like a leaking or missing vaccume hose to me, I had simmilar problem found open hole with hose off, replaced it now the RPMs are under 1000 again.
As for the stalling I also am having a simmilar problem, and am finding air in the fuel rail, I suspect the fuel pump is going.
I cant go more than a mile without problems.

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Engine cuts out @2400 rpms


Check the crank sensor. This is very common for this problem. Best wishes!

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Rpms fluctuate


You are running LEAN. Meaning it could be a number of possible problems. Most likely cause is a air pressure leak. Go to your local auto parts store and buy some carb cleaner. Run the car and spray into engine compartment. If you hear the engine RPMs go up then you've found your leak.
Do you have a check engine light ?

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Engine light on and rpms running high


i believe you might have a tranmission issue. you should get the check engine light check at your local autozone for free

Mar 04, 2009 | 2000 Dodge Caravan

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