97 7.3 Powerstroke rough when cold - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 12-07-2006, 05:54 AM Thread Starter
 
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Unhappy 97 7.3 Powerstroke rough when cold

This is my first post so I hope that there is help out there. I have a 97 F350 7.3 Powerstroke, edge programmer on the tow setting. Just recently my truck runs very rough and stalls if is cold and not plugged in. When it is plugged in it runs great. In the evening after work it idles rough, and if not given enough time (5 min) it will stall. After stalling it starts very rough. After 5 min of sitting it will drive but still rough. When the temo gauge comes off of the peg everything smooths out.
I have engine codes P1395, P1212 and P1211. All of them are new with the rough idle.

The other thing that I recently notices is a hissing from the turbo when I let off of the gas at around 1500 RPM. goes away above 1500 and seems to between 1200 and 1500.

Any thoughts? thanks:
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post #2 of 9 (permalink) Old 12-07-2006, 08:17 PM
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First things first....WELCOME to the garage!!!!!!

I think I can help ya a little bit. The hissing sound you are heatring when the truck is cold is the exhaust backpressure valve losing. It closes when the motor is real cold to hold in exhaust gasses to help it warm up faster. If you are driving and it does it, you will have virtually no power and no speed. It's not a big thing, nothing to worry about. It's doing what it is supposed to do.

My 95 idles real rough for the first 20 seconds or so when it is started cold. Done it for years. A long time ago, I had the shop check it all out. Glow plugs, relay, you name it, they checked it. Nothing was wrong. Truck has done it the whole time I have owned it. After like 20 seconds, the idle smoothes right out, and it is fine.

I dont know what codes you have thrown. Cant help ya out there.......



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post #3 of 9 (permalink) Old 12-10-2006, 04:26 AM
 
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big draft where you at in north michigan
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post #4 of 9 (permalink) Old 12-10-2006, 05:10 AM
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Quote:
Originally Posted by kellypedrick
I have engine codes P1395, P1212 and P1211. All of them are new with the rough idle.
P1395: Glow Plug Monitor Fault (Bank 1)
P1212: Injector Control Pressure Lower Than Desired (engine crank or run)
P1211: Injector Control Pressure Higher/Lower Than Desired (engine running)

Before I checked the codes, I was going to suggest checking your glow plugs. Recently I put new injectors in and did all my glow plugs also as long as I was already in there. After putting the new glow plugs in, I checked the old ones and found 3 of 8 were bad. By the sounds of it, mine was starting easier than yours. I'm bettin' you have at least 3 of them not working. Check your glow plug relay too.

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post #5 of 9 (permalink) Old 12-10-2006, 11:15 PM Thread Starter
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Smile Where did you look up the codes?

:thanks: for the suggestion I will check all of the glow plugs and relay and let you know if that does the trick. Where did you go to look up the PCM codes?

Thank You.
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post #6 of 9 (permalink) Old 12-10-2006, 11:21 PM
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Originally Posted by meangreen96
big draft where you at in north michigan
Kevin is in the St Helen area

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post #7 of 9 (permalink) Old 12-11-2006, 01:37 AM
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Quote:
Originally Posted by kellypedrick
Where did you go to look up the PCM codes?
Got em from my AutoEnginuity program.

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post #8 of 9 (permalink) Old 12-11-2006, 09:08 PM
 
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I have the exact problem! My truck was running just fine. I changed to a new tune setting with my Edge Evo, started it back up and BOOM! it idles rough. It is not like 20 seconds, it is more like 5 or 10 minutes. Does your check engine and wait to start lights come on too? Both of mine come on and stay on. I think the Evo did something to my PCM. I set it back to stock and still the same thing. Like I said, all was good till the minute I changed the program.
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post #9 of 9 (permalink) Old 12-11-2006, 10:53 PM Thread Starter
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:shrug: It sounds like a similar condition. The 'Wait to start' light goes off when the truck is ready to start, (quickly when plugged in, 1 min when cold) and does not come back on. The check engine light comes on right after the start of the truck. I have not yet checked the glos plugs but will be doing that this week. I will keep you poted.
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