94 F150 4.9 stalls when cold - no code

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01-20-2012 | 10:16 PM

Burgess0909

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94 F150 4.9 stalls when cold - no code

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Issue: The engine will randomly stall when first cranking it up. It may run a few seconds or a few minutes. It will start right back up and run smoothly until it stalls again. There is no change in RPMs before the engine stalls. It seems like a kill switch is flipped. If you press the gas pedal slightly, the engine will run smoothly and surge during the time it would typically stall, but it will remain running. After 5-10 minutes of running, the engine will run and drive smoothly until it has been shut off for 8 hours or so. There are no codes during KOEO or KOER. Prior to this issue, I had a 332 in continues memory. I replaced the EGR valve and replaced a clogged vacuum line. I then had a surge in RPMs while cursing in overdrive. I followed a thread and installed an EGR restrictor plate. The surge in RPMs while driving went away, but I am still left with the stalling issue.

Recent replacements: EGR valve, EGR solenoid, EGR sensor, EGR restrictor plate, plugs, wires

Distributor cap and rotor are in good shape with less than 20k on them. The fuels pumps are strong and I have tried both tanks. I feel like I may be losing spark, but the symptoms do not point me toward the coil or ignition control module. I had read all of the relevant posts, I am at a lost. Any suggestions would be appreciated.

Thanks, Justin

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01-22-2012 | 10:06 AM

Burgess0909

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I have changed the IAC, coil, and ignition control module. No change in symptoms.

Any ideas?

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01-22-2012 | 10:13 AM

Rockaholic

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If it happens and has trouble even with the pedal pressed, ever think it may be the TPS, its a long shot but its reletivily cheap and sounds like it could be that.

Now when i first got my truck I had an issue with a rocker sensor and when ever i took a turn to hard sometimes my motor would cut out for a few minutes.

Pull your spark plugs and see if they have any carbon build up on them, also look in the dark to see if a wire is cracked or split. Did you ever take distributor out? If so it might be timing is off.

Have you thrown some throttle body cleaner in and changed fuel filter, and done basic tune up in awhile? I know you said rotor and cap are ok.

If not that than it still sounds electrical.

My rocker sensor or any sensor for that matter that has to do with a instant shut off will not show a code. As far as i know when it goes off. It might log it somewhere but i am not sure where it would log it at.

Hope this helped a little, if not let me know and i can keep doing research.

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01-22-2012 | 11:46 AM

Burgess0909

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I have used seafoam for cleaner, but I have not changed the fuel filter. I have read that if it is a fuel delivery the problem would get worse when the gas pedal is pressed.
I did remove the distributor 20k ago. I rebuilt my engine a year ago. This problem just began a week ago. The engine runs perfect at any other time. I am stumped! I changed the wires this past weekend, but i will look for sparks tonight. When I changed the plugs, there was some carbon with an orange tint. I related this to the EGR value letting too much exhaust gas into the intake causing a lean mixture.

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01-22-2012 | 02:24 PM

Rockaholic

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When you had it rbuilt did you have all sensors replaced at the same time?

Have you added anything electronic to your vehicle? Stereo, Tach, etc... Could have a small short or something simple.

When you say cold, how cold?

Have you filled your gas tank lately? If you have a summer blend in your tank it could be like sludge and once the truck gets going of course the heat from the motor as it runs by it once it is warm will make it more like water again. If it is cold like up north and you happen to get the last of a summer blend at a gas station that could be the problem.

Air filter? Anything with that? Wouldnt cause a shut down but could be contributing. Check your oil and see how dark it is.

Have you checked your compression? maybe you got a bad ring or seal and it finally gave.

Have you had your battery checked? My truck had an issue with the volt regulator on the altenator and that cause it to just shut down when i was stopped.

I am just throwing easy things you can check out to see if it can help narrow things down, because there are 3 basic things a motor needs to run. fuel, air, and spark(at least a gas motor) haha.

So let me know what happens and what you come up with. When you take the truck to autozone or somthing like that, they can test your entire motor electrical by connecting to the battery and alt, it will see if your distributor is acting up, battery, and alt, and its free

Best of luck, again hope some of these help narrow it down.

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01-22-2012 | 04:45 PM

Burgess0909

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I will try to test the TPS over the next few days. I live in Charleston, SC, so cold means around 40-50 degrees in the morning. I only changed the engine coolant sensor during the rebuild. I just changed the air filter - dirty, but not too bad. I put new rings and seal in it 20k ago. I need to buy some tools to do a compression check. I will go to Auotzone in the next few days for a check up.

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01-22-2012 | 07:35 PM

Rockaholic

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Quote:

Originally Posted by Burgess0909

Ok, keep us posted. Was just asking so many questions to see if something sparked and maybe you found it in the process haha. If you figure out what it is please let us know!

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94 F150 4.9 stalls when cold - no code

94 F150 4.9 stalls when cold - no code

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