Starts rough - Ford Powerstroke Diesel Forum

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post #1 of 16 Old 04-11-2013, 07:08 PM Thread Starter
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Starts rough

My new to me, 1995 f250 starts any time of the day very rough and uneven clatters for the 1st 3 to 5 seconds after starting, but then smooths out and idels fine after that.
Should I be looking at anything to fix, or is this normal.
I listen to sound bits on YouTube and all the other 1995's burst into a smooth rithym right off.
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post #2 of 16 Old 04-12-2013, 06:30 AM Thread Starter
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What does it take to get any response from this site?
Iv posted twice and have only gotten one auto repley.
Im I not doing somthing right here?
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post #3 of 16 Old 04-12-2013, 09:55 AM
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Don't get too excited yet. Sometimes the more knowledgeable guys take a day or two to post a reply.

As far as how your truck starts, here are a few questions (and please forgive if it sounds like I think you're stupid. I don't. These are questions I'd ask anyone with a new to them truck):

1) Does your Wait To Start light come on and do you wait for it to go out before you try to start it? This light tells you the glow plugs have warmed enough for the truck to be able to start.

2) Have you checked your glow plug relay for proper operation?

3) Have you checked your glow plugs for ohm values?

4) Do you press the accelerator when you try to start the truck? Typically this is both unnecessary and unwise. It also can cause the condition you get.

There are several write ups on Hard Starting, Rough Starting and No Starts on this board. Have you done a search and read up on these subjects? That would be a good place to start looking for answers.

Good luck and us know what you find.
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post #4 of 16 Old 04-12-2013, 10:19 AM Thread Starter
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Thanks for getting back to me

There are no stupid ? and for me thats for sure.

1. Yes, the light does come on and I wait untill it goes out before pushing the button. The old guy installed a start button.

2. No, I have not checked the GP relay, but will read up on how to do that.

3. No, Iv not check my GP ohm values. I will read up on that as well.

4. No, I leave my foot off the accelerator untill after it starts and the
roughness stops.

Thanks for getting back to me. I will be changing oil, gear box (both of them) and the rear dif. fluid this weekend, so I will look into this info quickly.
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post #5 of 16 Old 04-12-2013, 11:02 AM
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Automatic or manual transmission?
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post #6 of 16 Old 04-12-2013, 11:09 AM Thread Starter
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Manual, 4.10 5speed with a Gear Vender installed
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post #7 of 16 Old 04-12-2013, 11:24 AM
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check your icp sensor. if their is oil coming through to the connector it is bad and its time for a new one.
you could also possibly have a bad ipr.
i had rough warm starts, slow starts etc.
then if it isnt that stuff i would check fuel pressure.

if you aren't getting white smoke on start up i would say its fuel or oil related.

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post #8 of 16 Old 04-12-2013, 11:26 AM
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That eliminates one cause; the autotragics do this sometimes when the selector switch (PRND21) is out of adjustment and the PCM doesn't "know" you're in Park.

Glow plugs / relay would be at the top of the suspect list, as mentioned above.
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post #9 of 16 Old 04-12-2013, 11:39 AM Thread Starter
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Sounds like I need a manual for this truck to find and know what all these sensors and selector switches are.
If its not a problom, could you tell me what and where the icp sensor is? and what is a ipr and where is it located?
Can I adjust the selector switch (PRND21)? If so, where is it?
Sorry for all the questions, Im learning all about this truck by the seat of my pants.
I will be looking for a manual very quickly.
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post #10 of 16 Old 04-12-2013, 01:15 PM
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Yes, factory service manuals (FSM) can be your good friend.

You don't have the PRND21 selector switch. That was a reference to automatic-equipped trucks (PRND21 is a reference to the gear selection). So that's not the cause of your problem. Just another blessing of having a manual tranny truck.

ICP - Injection Control Pressure sensor. Input to the PCM; measures high-pressure oil pressure (injection pressure) and "informs" the PCM.
IPR - Injection Pressure regulator. Output of the PCM; it's a valve of sorts; the PCM controls its opening to create the desired injection pressure.

Somewhere on this forum, or one of the other PowerStroke / Ford truck forums, is a guide to all the acronyms / buzzwords.
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