Question about 2000 Ford Crown Victoria

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Low voltage at idle

Whenever I reach a stop light my voltage drops real bad then I step on the gas and goes back to normal. it shoots back up when I hit neutral

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  • 69 Answers

You might need to remove the alternator and carry it down to your partstore so they can bench test it and determine if it is charging properly? It could be the voltage regulator in the back of the alternator which held by four screws?

Posted on Jan 07, 2015

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

SOURCE: rough idle when sitting at a red light until van warms up

change plugs

Posted on Oct 20, 2008

  • 2 Answers

SOURCE: 2004 Ford Ranger Low Idle

I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part

Posted on Jul 13, 2008

DIESELMUDDER
  • 2760 Answers

SOURCE: 1994 f-350 7.3 turbo diesel.tach reading 0 rpm's at idle speed.

yea the 93 to 95 trucks never had a tach that works very long
and first the Tach does not make the od light blink or ck engine lgt
the crank trigger does this little thing is located right in middle front of engine between the vac pump and pwr steering pmp looks like a brass bolt with wires comming out of the back of it costs about 30 bucks (don't forget the locktite blue)
now that should fix the od lights and the ck engine but it may not fix the tach thats done in the tach driver module on back of tach in dash
you can replace this but my vote it's too expensive I did mine just fine with a after market one(50 bucks), bolted it right in front of old one, it hooks up super easy gets it's signal off the alternator stator

im sort of suprized it starts ok with a bad crank trig (eec needs to see +50 rpm to start fuel flow to injectors )

any good shop with a eec scanner can see this in just seconds

Posted on Oct 06, 2009

rutherford_m
  • 63 Answers

SOURCE: Owner of 2004 Ford F250. Check engine light came

Check the fuel regulator at the end of the fuel rail. If if is not functioning properly it can cause the the problem that you are describing. Unfortunately other than doing an R&R with a known good regulator I do not know of a fool-proof test for this component.

Posted on May 03, 2010

  • 5280 Answers

SOURCE: 2001 ford windstar rpms drop low when idling and sometimes stalls

How long has this been going on? When a problem like this develops, it's always a good start to check for any fault codes in your engine's computer. Autozone and a few others will do a scan for free and give you any code numbers and technical descriptions, if the computer has stored any faults.
If you've kept track of normal maintenance over time, then a low idle should be a fairly easy problem to fix. That being said, it's not so simple. The computer controls your idle speed under all conditions, and relies on several sensors and switches (inputs and out puts) to work effectively. Have your mechanic check it with the low idle, dying problem in mind. Sounds to me like it needs tweaking-idle control valve, throttle position sensor, air flow meter. See? Get the proper diagnosis, so you don't buy unnecessary parts.
Maybe our ford guru, emissionwiz, will stroll along and find your fix from memory (he's the best).

Posted on Nov 04, 2011

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High temp low oil pressure light comes on after driving for a few minutes, then off when engine at driving rpm. At stop light (idle or low rpm) light comes back on. Normal driving it goes out.


You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.

The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.

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The first step is to see if the gauge are correct,low voltage can cause many problems, the first step is to make sure the coolant is full so check radiator, this is done when cold, if full then start the engine with a meter on the battery and watch the voltage, have someone put it into drive while holding brake. if voltage on meter starts to drop then give a little gas to rev engine and see if voltage goes up, if it does then you may have to low an idle but if the idle is ok then alternator is bad. also have the battery tested to make sure its good, just because it starts the truck does not mean its good. the next thing is to look at the overheating problem. if the cooling system is full and it runs hot then that must be looked at,when the truck is starting to overheat we assume it is due to gauge, but this sounds like it may be low coolant or low voltage or idle is to low because when you put it in park it drops. start with these checks and let me know the results. good day.

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Oil pressure is normal until it reaches200 degrees then oil presure drops to 10 pounds at an idle but give it gas and it goes up when its first started oil pressure is at 40 pounds until it reaches 200...


Oil pressure drop after reaching operating temp is normally caused by worn main bearings (depending on mileage).Worn bearings will allow pressure drop at idle and increase when accelerated above idle.

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When stopped at red light, the volt gauge goes into neg range, as soon as I hit the gas it goes into pos, I replaced alltinator and battery, what elese could cause this problem ? it seem to do it more...


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Aug 14, 2010 | 1991 Chevrolet Camaro

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My 1989 Daihatsu Charade CLS (3 Cylinder) has a low idle


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2 Answers

2004 Ford Ranger Low Idle


I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part

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