97 Yukon motor shaking and loud - Car Audio Classifieds!
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  #1  
Old 10-04-2010, 04:08 AM
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Default 97 Yukon motor shaking and loud

Ok i recently bought a 97 yukon that had a blown engine. Replaced it with a 350 5.7 vortec out of a silverado. Got it in, starts and runs good... However, it does not seem to have the power that i think it should, maybe it does i cant say for sure since its the biggest vehicle ive owned. Either way there is a problem with it, whenever your stepping on the gas and driving the whole damn truck shakes and its annoying as sh*t.. If you get going and just let it coast it does not shake, so it has to do something with the motor or something, i would think..

And then when you step on it, dont even need to step on it much at all usually.. Its loud as hell. It sounds like the radiator fan almost. But its so loud i dont know. I dont see why the radiator fan would be that loud. It defintily isnt normal.

Anyone have any ideas on what to do? I do recally the radiator fan was a little bent out of shape, could that cause any of the problems im having? I have another fan that is plastic i just dont think i have the tools to switch it out on this motor as its kinda weird how its mounted.

I do have extra/old parts off of the old motor if there is anything that i could swap out that could help. I switched the plugs already too. Maybe plug wires? That little box thing that has the spark plug wire that goes into the distributor cap? OR, i was thinking could the timing be off? The truck idles just fine tho.
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Old 10-04-2010, 04:11 AM
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vacuum line?? motor mounts?
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Old 10-04-2010, 04:12 AM
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What vacuum line could cause that? As far as i know ive got all the junk under the hood hooked up now. I dont think it could be the motor mounts? They didnt look damaged.

I dont know why, i kinda feel like its a problem with the motor itself...
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Old 10-04-2010, 04:13 AM
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What do you mean its mounted oddly? If its a 97 Yukon, it should have had a 350 in it...should be a direct drop-in replacement.

Also, if that holds true, take a better look in the daylight and see if you can pinpoint(have someone rev the motor) where the sound is coming from...if it's coming from the radiator fan, there's no reason you cant pop the shroud off and replace the fan with the old one that came off the truck.
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Old 10-04-2010, 04:16 AM
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What did i say was mounted oddly? The radiator fan? Ya i dont really know how its mounted, all i see is a big nut on it and the fan like screws onto the water pump. I will try and replace it tomorrow. The fan on the motor i put in was metal and bent up kinda, the original one for the truck was a plastic one with more fins, so im going to try and get that put in tomorrow. Im not sure what you meant but the motor was a drop in replacement or if you meant the fan, i just wasnt sure how it came off.

I know that when you rev the motor a hell of a lot of air blows when the hood is open. It almost seems like more than it should. I think its safe to say i need to change the fan. But that is more than likely not gona fix my vibration problem.
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Old 10-04-2010, 04:21 AM
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Well, you may be surprised(even if its not the problem) how much it helps. Being metal(and relativley heavy for a fan) and bent, its going to be off balance and is going to shake the shit out of things, regardless as to whether or not that's the problem.

I misread earlier - thought you said the motor was mounted oddly, but it was the fan you were talking about(sorry). Anyways, take a good gander at it and see if you cant get the shroud off and replace that metal fan with the plastic-finned fan. I just see it as the easiest place to start.
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Old 10-04-2010, 04:23 AM
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Thats fine. Yup for sure one of the first things i do tomorrow on the truck will be to get that POS bent fan out of there and then see where that goes. Hopefully it at the very least helps with that huge ROARING noise im getting ha its ridiculous how loud it is.
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Old 10-04-2010, 04:29 AM
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I've heard a LOT LOT LOT of older Chevy trucks that do what you're talking about. It literally "ROAR" 's at you...

Regardless, the bootleg fan just doesn't help things
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Old 10-05-2010, 03:01 AM
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Ok i found the problem of the ROARING bullshit.. It was the fan, but it wasnt the fan itself. I changed it out to the original plastic one and was just as loud just a different sound. So i figure hey maybe the fan clutch is being gay, so i spray some crap on it and get it to turn easier, what do you know it sounds normal now.

Still shakes like a ***** tho.. I changed the distributor cap/cover or whatever, but not the whole distributor itself. Changed plugs. Changed the thing that hooks up to the distributor ha i dont know what its called, it has one plug wire that comes from it and goes to the distributor. None of what i did helped the shaking at all.. Tomorrow i may check out the timing or the whole distrbutor itself. I dont see how it could run so good at idle tho if its off in timing. But maybe the distributor is going bad
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Old 10-05-2010, 03:09 AM
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lol the rad fan making it loud, check the wiring of the sparkplugs if its a distributor get a wiring diagram and make sure they are on right. change the plugs, wires, dist cap(if applicable) oil and make sure the coolant is good, then the intake. egr valve an fuel pump and pressure, hell even the trans could make it chug a bit. alls im sayin is it could be alot.
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