97 7.3 need help runs rough - PowerStrokeNation : Ford Powerstroke Diesel Forum


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Old 04-17-2011, 07:21 AM
johnpline
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97 7.3 need help runs rough

Ok so I thought i was getting a good deal on a 7.3 that i was going to use around the farm. The day i test drove it everything was fine and it ran good but today it is doing all sorts of crazy ass things. Im 1500 miles from home and pissed off. I had to put batteries and a alternator in it right off the bat. Which i was told it just needed new batteries should have known better. The issue is when I start it the check engine light is on and it idles for 2-3 minutes and dies, start it immediately back up check engine light on idles 2-3 minutes dies and start again and no check engine light runs rough but stays running. My fatherinlaw owns a dealership back home and he said it sounded like the lift pump at first. But then he went into talkin about the blowby and the engine possibly being dusted. I did the oil cap test like he said. There is smoke coming out of the fill hole, but it doesn't build pressure if i hold my hand tight over the hole, i can't tell if pressure is pushing the cap off or just vibration. I am freaking confused and pissed off im ready to go run the guy down i bought it from. If anyone has any ideas id greatly appreciate it. Oh i did scan it for codes and there where no codes.
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  #2  
Old 04-17-2011, 08:20 AM
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Re: 97 7.3 need help runs rough

What scan tool are you using? If it's throwing a check engine light there is a code in the system.
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Old 04-17-2011, 06:25 PM
johnpline
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Re: 97 7.3 need help runs rough

I took it to the shop on the base where I'm stationed. The had a snap on.
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Old 04-17-2011, 08:28 PM
johnpline
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Re: 97 7.3 need help runs rough

I also just has to put another alternator on it today.2 in 2 days could they be related problems? If so any ideas?
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Old 04-17-2011, 10:17 PM
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Re: 97 7.3 need help runs rough

What is the issue with the alternators that you are having? is the truck not charging? How are the batteries?
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Old 04-18-2011, 12:20 AM
johnpline
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Re: 97 7.3 need help runs rough

Ok They guy i got it from said the batteries needed replaced so i put new in yesterday when i went to pick it up and discovered that the batteries weren't the only problem or i suspected and i was right the alternator tested bad so i replaced it. There is a chance the new one was fault but i doubt it cause it was fine for about 30 miles and all the sudden the battery light comes on so i take the new alternator in it test low output and the batteries where way low. Charged both batteries and changed the alternator. So far so good with that. But could the starting and dying be related to electrical?
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Old 04-18-2011, 12:32 AM
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Re: 97 7.3 need help runs rough

Its possible. Do you have a multimeter? Test your batteries.... Then test the output on the alternator...
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Old 04-18-2011, 12:39 AM
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Re: 97 7.3 need help runs rough

Not getting the full 12v to run everything?
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Old 04-18-2011, 01:20 AM
johnpline
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Re: 97 7.3 need help runs rough

Batteries full charge and alternator is showing good. Could I have bad wiring under the vc or a bad sensor that could cause it? Or maybe other bad wiring?
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Old 04-18-2011, 02:50 AM
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Re: 97 7.3 need help runs rough

It is possible.
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