Powerstroke coughing under load? - Ford Powerstroke Diesel Forum
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Old 06-01-2009, 11:34 AM
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Question Powerstroke coughing under load?

I have a 2003 F-350 Dually, 6.0 Powerstroke. A few months ago I installed a cold intake K&N type air filter. Now under load, like when I have the camper on the back, it coughs and spits black smoke intermittently between about 1900 and 2400 RPM. If I kick it down a gear and up the RPMs, it's OK, until it downshifts again. I replaced the air filer sensor,(it was broken), but as expected, that didn't stop the coughing. Is this an air sensor problem or injectors? I tried to speak to a diesel mechanic at the local Ford dealership, but they are all too busy; they have closed down two Ford dealerships in Sacramento.

sps_sac
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Old 06-01-2009, 01:19 PM
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Same problem

Im having a very similar problem. Lots of black smoke when I floor it, bucks and appears to backfire under a slight lode or when I go up a hill. Check engine light used to come on when the fuel tank got low but seems to be on all the time now. Hoep someone answers you to help me! dave
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Old 06-01-2009, 01:31 PM
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Black smoke is usuall a result of more fuel then can be combusted. Or possible a stuck/glogged EGR vavle.

The EGR is easy to clean, unplug take 2 bolt out GENTLY pry it out soak it in carb cleaner only NO BREAK CLEANER, scrub till clean, be sure not to get any cleaner in 2 holes on lower side of vale head, replace o-rings and gasket $7 at dealer, and reinstall.

Injector.... they get costly. Sometime org members have them for sale for cheap but a pain to change. Just make sure you get the ones for your truck. 03's are diffrent for 04+ engine build year. And some 04 still had the 03 build year in them.
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Old 06-01-2009, 02:14 PM
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OK, I'll give that a try!

Thanks, I'll give that a try. I've been reading some of the treads; do you recommend an EGR/Cooler delete kit?
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Old 06-01-2009, 02:16 PM
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Quote:
Originally Posted by sps_sac View Post
Thanks, I'll give that a try. I've been reading some of the treads; do you recommend an EGR/Cooler delete kit?
One thing you have to worry about is the fact that Cali will start smogging Diesels next year. If you have no EGR you will fail....
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Old 06-01-2009, 02:18 PM
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If you can afford the EGR delete don't wait do it now!!!! This is one of the best on the market, but it does have a price tag.

Product Detail
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Old 06-01-2009, 03:11 PM
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EGR Valve

I read one tread about welding the in the valve in the closed position so that it won't open. Thoughts? Will that still pass smog?
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Old 06-01-2009, 03:19 PM
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That will pass, so far all they do is a look to see if your EGR and CAT are still in place and plug into you OBD2 poet under the dash to check for codes. But I can soon see on the 08+ truck a sniffer in the tailpipe like gas cars and trucks.

The only down fall to that is you can still have the EGR Cooler failure. Which leads to replacing the oil cooler to boot. If your in a nondiesle emission state take it all off and keep it stashed just in case. Out here is NC they don't give a dang and prob won't unless its for the 08+ trucks.
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