03 7.3 misfire? - Ford Powerstroke Diesel Forum
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Old 03-15-2008, 01:29 PM
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03 7.3 misfire?

i am trying to buy an 03 f-250 with a 7.3 and it has a misfire. truck has 200,000 on it and when its cold it misses real bad but when it warms up it only misses a little. i know the glow plug relay is bad because we had to jump the relay to get it to start on a cold day, that would explain the miss when cold but it shoulnt miss when fully warmed up. i was thinking maybe possible injector, injector module, or compression issue. what do you guys think? there is no check engine light on either.
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Old 03-15-2008, 01:37 PM
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You need to have a compression test, buzz test, and contrib/balance test run.
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Old 03-15-2008, 01:38 PM
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I would run a injetor buzz test and a contribution test before you buy it.
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Old 03-15-2008, 01:39 PM
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What dirk0 said
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Old 03-15-2008, 02:04 PM
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can the dealer do that? and how much does it costs for those tests? is it something i can do?
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Old 03-15-2008, 02:20 PM
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Any competent diesel shop can do this. Unless you have the equipment, it is not something you can do.
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Old 03-15-2008, 02:40 PM
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ussually a miss on a diesel engine is very bad, since it is run off of compression you could be dealing with bad rings. Could be something else also though.
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Old 03-15-2008, 02:43 PM
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Quote:
Originally Posted by 99SMOKR View Post
ussually a miss on a diesel engine is very bad, since it is run off of compression you could be dealing with bad rings. Could be something else also though.
Do not listen to this. Run the tests I listed above. Don't put the cart before the horse.
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Old 03-15-2008, 02:52 PM
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the miss cold is the injectors sticking ,due to worn internal parts in side the injector im sure the glow plug relay could be bad , but will not cause the engine to skip cold, more than likely the injectors are the only concern with that, if you have no check engine light then wiring is good which rules out the need for a buzz test, if i were you i would have a contribution test run after hot , pinpoint which cylinder or cylinders are skipping , run a compression test on those cylinder , if compression is above 360 lbs on that cylinder, replace necesary injector
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Old 03-15-2008, 03:29 PM
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does anyone know how much a repair shop usually charges to do these kind of tests?
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