Thanks for the Invite! Knock and Mechanic question - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 08-15-2012, 02:09 PM Thread Starter Rookie
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Thanks for the Invite! Knock and Mechanic question

Thanks to Supercrutyps for pointing out the local west coast thread! I live in Lake Tahoe (Tahoma) and bought a 96 f250 7.3 4x4 extra cab. It has 172000 and runs great. I got it from the orginal owner who bought it in Sacramento. He lived in Reno, Nv and seemed to maintain it very well. He always brought it to TNT diesel in Sparks, Nv. When I bought it I had them check it out and besides needing u joints, they said it was in tip top shape. He had done all the necessary replacing and maintenance. New Tranny, New glow plug harness, relay, etc... After driving it about a week I noticed a rythmic knocking when in gear at a stop. Once I put it in neutral or step on the gas with the brake on, it goes away. It also only happens after the truck has ran for about ten minutes or so. The truck idles smooth, has great power with no smoke out the exhaust, and around the lake I have got as high as 21 mpg out of a tank! I have brought it twice to TNT to have them look at it and they say that it is an injector probably leaking fuel and the knock I hear is really a pop. They say not to worry and just keep driving it. I'm not 100% convinced as I can hear the knock at low rpms when moving as well. It goes away at certain rpms and and cruising speed. Could it be a thrust bearing? If so will driving it till it goes be really bad? I'm a do it yourself kind of guy, but new to diesels and really want a reliable truck. I have a cabover and a small enclosed trailer that I'm aching to get out on the road with this fall for some fun. Was wondering if anyone had any ideas, and or know of a good trustworthy mechanic in the area? Thanks very much! Matt
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post #2 of 6 Old 08-15-2012, 02:25 PM
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Hey Matt - Glad you found your way over here!

There is a member in South Lake Tahoe, Tahoeguy.

He might know of a place up there that could help. You may need to PM him. He hasn't real active, but it's worth a shot.

Only other suggestion would be doing a Google search for shops in the Truckee area, North or South shore. I left the name of the shop I use down here in the other thread, but that's a drive for you.

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post #3 of 6 Old 08-17-2012, 02:36 PM
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welcome aboard. I think your likely the only Tahoe member so far. Not many nor cal people, me I'm 50% oregon and 50% norcal. sacto


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post #4 of 6 Old 08-17-2012, 02:39 PM
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contact m-chan here on the org, he's a great mechanic & can probably help u


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post #5 of 6 Old 08-17-2012, 06:57 PM
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If its an Injector see if this place can do Injector contribution and balance test. If they dont know what you are talking about just turn around and walk away peacefully...

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post #6 of 6 Old 08-17-2012, 11:34 PM
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^^^ I would also recommend an injector buzz test and a cylinder contribution test. Everything sounds like a bent push rod to me but the fact that it goes away under certain rpms. Good luck and welcome to WCS!

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