Excursion 7.3 hesitation on acceleration - Ford Powerstroke Diesel Forum

 
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post #1 of 7 Old 07-11-2012, 06:33 PM Thread Starter
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Excursion 7.3 hesitation on acceleration

I just bought a 7.3 excursion with 200,000 miles. I noticed a hesitation or engine misfire/cut out(best I can explain it) while accelerating and holding speed (around 50-60). Truck does seem to lack power.maybe. It seems like the problem is most evident on initial startup then drive. I check codes and I've got a glow plug mod bad and back pressure sensor bad. I don't think these things can cause these problems. I also notice a miss at idle sometimes. Can a injector cleaning solve problem? Is there a option to run a cylinder balance test on a scanner for the 7.3?
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post #2 of 7 Old 07-11-2012, 09:39 PM
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acceration

get a new CPS for starters maybe ?
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post #3 of 7 Old 07-13-2012, 06:55 PM Thread Starter
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I don't think the cps would cause a misfire. It kinda feels like it bucks espescially when accelerating at around 2000 rpm. When running seems fine. I'm still getting around 17-18 mpg on hwy. no chip just intake. Anyone has luck using injector cleaner?
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post #4 of 7 Old 07-13-2012, 07:07 PM
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I run powerservice (think thats the name) and have had great luck with it. can get it at walmart for about 7$. when I bought my truck it seemed like maybe some injectors were sticking on startup (rough idle, misses kinda like you describe) but after I ran a few tanks of that have never seen the problem again. Not to mention I get about 2 mpg more when I use it. Pays for itself, I will always run it!

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post #5 of 7 Old 07-13-2012, 07:40 PM
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Quote:
Originally Posted by Indy View Post
I don't think the cps would cause a misfire. It kinda feels like it bucks espescially when accelerating at around 2000 rpm. When running seems fine. I'm still getting around 17-18 mpg on hwy. no chip just intake. Anyone has luck using injector cleaner?
When my cps went bad, it did cause a misfire. It would act strange at odd times and the rest of the time I never knew I had a problem. I would just start there, as they are cheap and easy to replace. Also they commonly to go bad many people keep a spare.
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post #6 of 7 Old 08-19-2012, 05:33 AM
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I have had the same issue as Indy (I think). Have owned my 01 for about 18mos. The random misfire seems to be more apparent at lower speeds or just beginning to accel after coasting. I can always power through the stumbling effect by applying more pedal. I always have plenty of power and no codes. It may just be a coincidence, but my issue seems to better itself after an oil change. This issue is driving me nuts! Any suggestions would be appreciated.
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post #7 of 7 Old 08-25-2012, 04:38 PM
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Update to the hesistation/misfire. I replaced the CPS since it was cheap and while checking sensor plugs for signs of oil, I found the ICP was leaking oil through the plug. I cleaned it and the sensor with brake clean and packed it with dielectric grease - bad idea cause I think it acutally made the issue worse. Today, I "rebuilt" the IPR, pulled the ICP to clean it (hoping to find something) cleaned the plug and used no grease this time and then crossed my fingers for the better. My test drive seemed to be sucessful! I cant say exactly what I think was causing the issue sinc I did several things at the same time. I ran across an ICP on ebay for $54 so I'll swap it out anyway since it shows signs of leakage.

Last edited by dsw140; 08-25-2012 at 04:44 PM.
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