7.3 runs real bad and white smoke - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 09-03-2012, 01:11 PM Thread Starter
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7.3 runs real bad and white smoke

so i was just driving the truck today and it was running perfect. i turn into my neighborhood and it just starts running like crap and would not
go past 5mph i get it to the drive way and it dies went to start it and it would drop to like 500rpm then back up to 800rpm for about 10sec then smoothed out but still no throttle response at all and white smoke as soon as it started.

i just got this truck a month ago and the previous own said it has new injectors and fuel pump i did a full service on it and everything was fine no fuel in oil or coolant and there is no CEL on

so i am lost at what could be wrong

turbo?
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post #2 of 10 Old 09-03-2012, 01:47 PM
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Not turbo. Under valve cover harness or the pigtails on the motor side harness. Supplies power to the injectors.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #3 of 10 Old 09-03-2012, 01:51 PM
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Unplug the ICP sensor and try to start.

Check fuel bowl for oil.

Check oil level

Check for fuel pressure.

Inspect all the valve cover gasket wiriing harnesses for burns, broken pins, etc. Both outer and underneath valve covers.

Report back.
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post #4 of 10 Old 09-03-2012, 01:52 PM Thread Starter
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Originally Posted by jesilvas View Post
Not turbo. Under valve cover harness or the pigtails on the motor side harness. Supplies power to the injectors.
so what pull the valve cover and check the harness?
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post #5 of 10 Old 09-03-2012, 01:55 PM Thread Starter
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Originally Posted by ianstew View Post
Unplug the ICP sensor and try to start.

Check fuel bowl for oil.

Check oil level

Check for fuel pressure.

Inspect all the valve cover gasket wiriing harnesses for burns, broken pins, etc. Both outer and underneath valve covers.

Report back.
i checked the oil as soon as i got it home and its good there
ill try the other thing
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post #6 of 10 Old 09-03-2012, 01:55 PM
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Yea, plus all that other stuff. And where they connect right on the edge of the VCs



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #7 of 10 Old 09-03-2012, 02:10 PM Thread Starter
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ok took off the icp and took it down the block
it still runs like hell and now it feels like it is not running on all cylinders
plug it back in same thing it feels like it is stuttering while under throttle
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post #8 of 10 Old 09-03-2012, 10:24 PM Thread Starter
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Quote:
Originally Posted by ianstew View Post
Unplug the ICP sensor and try to start.

Check fuel bowl for oil.

Check oil level

Check for fuel pressure.

Inspect all the valve cover gasket wiriing harnesses for burns, broken pins, etc. Both outer and underneath valve covers.

Report back.

ok so i check all that and it seams to be all normal

whats next
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post #9 of 10 Old 09-04-2012, 03:40 AM
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So ICP unplugged was about the same? I'd think ICP needs replacing. Was there oil in the connector? If so, it needs it anyway.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #10 of 10 Old 09-05-2012, 10:43 AM
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there was a thread few years ago (kept link for this reason). Even though your symptoms are compatable with bad UVCH being unplugged, theres a sensor in the middle of the spider assy. The thread b4 was a smoke issue, bad run'n and when he unplugged it, the truck ran fine then. Might give ur a shot, unplug sensor, see what happens. I'll post back with "DELPHI" # for sensor.

Some reason, my eba account "lost" the part link, but i wanna say its the DELPHI TS10098 sensor.

99.5 x-cab 7.3l, 6spd, 161k miles.....

Last edited by timmyboy76; 09-05-2012 at 10:55 AM.
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