Question about Ford F-250

2 Answers

The tach on my 93 f250 only works when the engine speed is above 1200 rpm when its at an idle it doesnt register which at that time the the od light flashes but when the tach is working the od light stays off help please

Posted by on

  • krubs12 Jul 07, 2010

    i have a 1993 f 250 with 07.3 liter diesel the tach only work when the rpm are over 1200 when the tach drops off the od light flashes

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Expert
  • 4,070 Answers

Hi! Please try this. Turn off the engine and remove the battery connectors. Let it sit for atleast 30mins. This will somehow reset the system and get rid of the problem. Hope this helps and have a good one!

Posted on Jul 06, 2010

  • dj_relly999
    dj_relly999 Jul 07, 2010

    Alright, have you checked the fuses and relays? Please try to do so and replace blown relays/fuses. If theres none, just try pulling out and reinserting the fuse and relays for they may just be loosing its contacts. Cleaning corroded relays and fuses will help too.

×

A flashing OD light indicates a stored trouble code inside your trucks computer. The best thing to do is drive it to your local auto parts store and borrow (for free) there on board diagnostics (OBD II) scan tool. This electronic took hooks up underneath the drivers side steering wheel and will obtain the trouble code. After you get the code, look in the back of a Haynes manual (also avalible at the auto parts store) and match the code number that came up on the display to the code number found in the repair book. This will save you time and money vs. replacing parts that don't need to be replaced and takes the guess work out of the repair. The trouble code will most likely have something to do with the tach and the transmission

Posted on Jul 07, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Idle fluctuates on 1995 f250, sometimes dies, sometimes revs, no apparent vaccum issues, IAC with scan tool reads low voltage issue. Could this be vaccum, charging system, faulty computer? Problem is...


Engine stalls cold or RPM fluctuates at idle up and down or dies near idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.

Nov 08, 2012 | 1995 Ford F250

1 Answer

I have an 89 ford f250 and the lights go dim then bright and back and forth when truck is idling. When i rev it up they stay bright, have any ideas


This can be a lazy Regulator, a bad Alternator, or a low idle speed. You should go to Autozone, Advance, or Oreilys to get a charging system check. Have them test the battery while you are there too. The tests are free.
Although you do not have a trouble light on, if they scanned your engine you could find out what idle speed you are running. Or if you have a Tach, it will give a rough estimate of RPM. But a few RPM can make the difference between charging and discharging.

I hope my solution is helpful.

Sep 30, 2011 | 1989 Ford F 250

1 Answer

I have an 89camaro irocz 28 with 5.0, with a rebuilt tranny about 3 yes ago. While driving on overdrive at about 40-50 mph it will shift into od geer then back to 3rd then od again what could be causing...


Yes it can be what it is doing is called hunting, As for your RPM tach it has nothing to do with it, Now your transmission is a 4L60 and YES it does need a tach signal or the RPM signal it doesnt matter if your Tach gauge doest work but it need the tach signal for the transmission to work. And NO there is NO VSS it needs TACH. or it will hunt for a shift that is why its doing this.Youll need to restor the TACH to the transmission so it can shift properly, Now youll either have a 4pin connection,1 wire or youll have a 4 pin 2 wire connection or youll have a 4 pin 3 wire connection This transmission need tach signal so bear with me i am going to some how draw it pretend your looking at the switch. connection

l-------------------------------L
I A B I
I C D I Okay the C is TACH that has to work

Apr 23, 2011 | 1989 Chevrolet Camaro

1 Answer

03 Mazda Tribute's charging indicator light begins flashing on and off when engine reaches 1200 rpm and becomes contineously on at and above 1500 rpm. With engine idling or decelerating to below 1200 rpm...


It may be that the light is being tripped due to an "over voltage" condition. The faster you spin the alternator/engine the higher the voltage output of the alternator. I would test the voltage coming out of the alternator. It should be at about 14.3v or so max. If it gets into the 16v+ range when you increase the engine RPM then the voltage regulator has failed and needs to be replaced.

Feb 03, 2011 | 2003 Mazda Tribute

1 Answer

1995 Cherokee with 4.0 engine. Intermittently, it will run rough for a few minutes after starting, then run smoothly. Sometimes while driving in light traffic, slower speeds, it will seem to hold engine...


all that an not one RPM stated, making the meter useless.
numbers matter, tell them.
all that can be condensed to idle controls, dead hot.
you took it to a shop but was running great then.
so he guessed, and spent a fortune doing nothing.
why do that. ?
take it in broken, or have them drive it for a day to work.
find a real shop that can do that. and win.,
THE idle controls can fail many a way.
1: the control is bad. (ISC/IAC) they like to stick clean it.
2: vacuum leaks causing above.
3: gross engine misfiring (50 causes)
4: not scanning it. you didnt. so, work blind.

next time post actual RPM, when missing up.
and win, !!!!
the PCM not stuck in LIMP-in mode, will work big time hard
to prevent engines from stalling and to hold spec rpm
700? hot.
the ECU modulates the ISC to hold 700 rpm , HOT, in neutral or DRIVE, if you go P N, D and P, the rpm must hold at spec, 700
if not the ECU is not regulating RPM is it.
and not scanning it now, you may never lean why.
scan cars failing, not working right., and win.

lets say you said, just to show how important numbers are.
RPM is 400 or 500 engine shakes.
EGR stuck open( if it has one,)
or engine gross misfiring ever get a full tuneup this decade, even spark plugs. OMG no>?
injectors leaking or clogged

at the 10min no start.
does 5-10% throttle action (right foot) allow it to start now.
NO, try wide open throttle starts.
bingo, then its flooded
if it floods, post , why does my engine flood. and get other answers
like a tuneup.,

Mar 09, 2017 | 1995 Jeep Cherokee

2 Answers

I was wondering what rpm should my tacometer be at when going 70 mph? it seems high and im not sure if transmission is dropping into the final gear. the overdrive doesnt work either, is it stuck in...


Cruising speed rpm should be roughly 2200 rpm If OD (lockup) is not engaging it will be running at about 3,000rpm.
If it was staying engaged, you would not have a problem at cruising speed but would be "lugging" when taking off from a standstill. OD should come on at about 45mph and the tach should show a drop in rpm.

Apr 20, 2010 | 1999 Jeep Grand Cherokee

1 Answer

I've had new plugs and wires installed but my car is still idling high. The RPM is at 10 instead of zero when sitting at a light. Midas says my serpentine belt is cracked. Is the serpentine belt the same...


The serpentine belt is not the same as the timing belt! Not sure how your tach reads but at idle it will never be zero unless the car is not running. The tach tells the engine speed and if it is running you have to get some kind of reading. The idle may need adjusted or a vacuum line could be off but a zero reading at idle at a light is not correct.

Nov 29, 2009 | 1999 Chrysler Sebring

1 Answer

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

Apr 12, 2009 | 1993 Ford F350

1 Answer

Rough idle and engine stumbles at highway speed


I have run across this problem and discovered that it was the mass air flow sensor.

Nov 03, 2008 | 1998 GMC Suburban

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

129 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

75197 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

fordexpert

Level 3 Expert

5481 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...