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Battery light and brake light come on when accelerating.

Tempeture gauge increases when accelerating. all go to normal at an idle.

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I am having several problems with my 2004 Ford F150 STX, it is a 4.6L V8. It is a 4wheel drive Problem one: when I applie the brakes the Lights drasticly dim(all the Lights, dash, head....etc) also the...


-When brake and dim all light that and decrease air flow mean the brake light has bad ground. So it need new or good ground.
-Lot of thing can cause rough idle.
-Vacuum line leak, pinch or block.
-Bad injector
-Low fuel pressure
-Bad spark plug or and plug wire, weak spark.
-Coolant leak into the combustion chamber.

Good luck

Mai

Mar 28, 2017 | Cars & Trucks

1 Answer

The voltage gauge drops when i rev the motor.


Have your alternator checked at your local alternator/battery store.. it sounds like a diode has gone bad...

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The oil pressure gauge in my 2002 Duramax Diesel engine PU increases during acceleration and returns to normal following acceleration. Why would this happen?


That is normal. As you accelerate and rpm's increase the oil pump rpm increases. I think the oil pump runs 1 to 1 or 2 to 1 with the crankshaft rpm. Check the oil and inspect for any visual leaks if the gauge does not operate like that consistently. If it is intermittent or it just started acting that way, the sender my be bad. Other than that any Chevy Dealer will say that is normal.

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You put pulleys on to increase power , but slowed down the alternator. Theres your sign. At idle speed the alternator isnt spinning fast enough to charge. So you can put original pulley back on, or a smaller alternator pulley.

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1 Answer

1999 ASTRO VAN ACCELERATES WITH AC ON


It is perfectly normal for the idle speed to increase with the AC on. This is done to ensure that adequate coolant flow is available for the increased strain the compressor puts on the engine.

If the idle increase is too high, there is a safety problem. There is an idle adjustment that can be made to reduce RPM to factory specification when the AC is on.

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1 Answer

Rough idle / varying oil pressure when accelerating


Ok not to keen on newer vehicles actually prefer the carburated ones, but oil pressure is supposed increase on your gauge when accelerating. If it wasn't going up before and just staying at 40 the needle might have been stuck. But idle should be 40 lbs and when you work the moter (reving or driving down the road) the guage should show an increase for every 1000 rpm above idle. Second if you can get a hand held scanner (bought mine off ebay for $30) check for any codes in your computer you will probably find that you either have a bank running wrong or some other sensor that needs to be changed. I'd go with getting my own scanner it saves alot of money and time, garages make their money here.

Jan 03, 2009 | 2005 GMC Yukon

1 Answer

Gauges, dash lites ets are flashing, moving back and forth


my 2003 s-10 did the same thing. my problem was a low battery.i put a new battery and have not had a problem since.

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1 Answer

Check gauge light comes on?


How does the battery voltage gauge read at idle? Is it below 14v.? May be a drained battery or an alternator malfunction.Hope this helps.

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