I need some input!

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Aug 30, 2006 | 02:31 PM

fordlovin

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From: IOWA

I need some input!

I just got my 01 F250 checked out at diesel shop in my area and they said they have narrowed the knock down to cylinder #7. I was suspecting an injector was bad and they said, that could very well be and that is where they would start. I was wondering, where is the best place to get a good but low cost injector to replace it? Should I even try to rebuild it or just replace it?

Aug 30, 2006 | 02:38 PM

fordlovin

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From: IOWA

Is there any way that I can be sure that this knock is not a bearing or a piston ring gone bad? How bad is it to drive with a weak injector?

Aug 30, 2006 | 03:03 PM

bloomy63

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From: York, PA

did the shop do a cylinder contribution test?
a used oil anaylsis can possibly show if a bearing, or ring is bad without having to open up the engine. it's alot cheaper too about $20

Last edited by bloomy63; Aug 30, 2006 at 03:05 PM.

Aug 30, 2006 | 03:04 PM

fordlovin

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From: IOWA

Good idea. I think I will do that when I change the oil this weekend.

Aug 30, 2006 | 05:05 PM

1997F-350

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From: SHELTON, WA

Quote:

Originally Posted by bloomy63

did the shop do a cylinder contribution test?

well did they?

Aug 30, 2006 | 08:42 PM

fordlovin

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From: IOWA

They didn't. The guy said that injector was weak and he is about 98% positive that it was the cause on the knock. I will change it next week and let you all know.

Aug 31, 2006 | 10:14 AM

bloomy63

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From: York, PA

how does he know that #7 injector is the week one without running the cylinder contribution test. you might not even have a bad injector. i wouldn't start throwing parts at it until i was sure of what the problem is. a cct should only cost about $100 or less. while injector + install will be alot more, if it even is an injector, and if he guessed the wrong one, it will cost even more. who knows without some more testing.
mho

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Aug 31, 2006 | 02:46 PM

Kwikkordead

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From: Rio Rico, AZ.

Quote:

Originally Posted by fordlovin

HOLD ON! I miss read! I kept reading compression not contribution. Is a contribution test when they take the valve cover off and they check each injector one at a time? If so, then YES.

That's the hard way. The easy way is to hook up a scanner and watch for rpm drop in a percentage value for each cylinder as it's idleing. The weakest injector will yield the highest number.