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LinkBack | Thread Tools | Display Modes |
03-15-2008, 02:29 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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03-15-2008, 02:37 PM
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You need to have a compression test, buzz test, and contrib/balance test run.
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03-15-2008, 02:38 PM
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I would run a injetor buzz test and a contribution test before you buy it.
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03-15-2008, 02:39 PM
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What dirk0 said 
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03-15-2008, 03:04 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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03-15-2008, 03:20 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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03-15-2008, 03:40 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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03-15-2008, 03:43 PM
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Quote:
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03-15-2008, 03:52 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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03-15-2008, 04:29 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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