WE MADE IT OK, BUT HAVE A QUESTION??
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WE MADE IT OK, BUT HAVE A QUESTION?? - 5/10/2008 5:28:56 PM
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4x4blazerguy
Posts: 188
Joined: 3/9/2008
From: EXIT 105
Status: offline
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Well everyone, the Blazer made the trip in good order. It pulled the Cargo trailer without any problem. So we are back home in good order.
Now the question. I was headed up Spring Mountain, this is a hard pull, of about 8 miles. The Blazer shifted clear down to 2nd gear to pull this pass. I was running along in 2nd gear @ 3000 RPM it seemed to want to run there pretty easy. Well, as I got into the pull about 1/2 miles the engine was running about 3200 RPM & all of a sudden I hear a knocking & thought I lost a rod. I let off the throttle, knocking slowed down with the engine RPMs, at at about 2500 RPMs the knock quit & I took the RPM up to 3000 RPMs the knock was gone. It did it one more time, exactly the same way. Both were on the steepest parts of this hill. I knew it wasn't a rod knock because it would of blew, not get quiet. Well I drove over the mountain and into town 35 miles away & it ran great. When in town I tried to repeat it by taking it over 3 grand in 1st, & 2nd gears manually NO NOISE. I tried it again going trough the gear letting it shift it self, the same result. It really baffled me. It sounded just like a rod knocking. My only thought was maybe a lifter collapsed under heavy load, then when I let off it it pumped up. No engine code lights, it runs good. In fact I checked mileage, the first 70 miles it got 15.5 MPG, on the rest of the trip 110 miles it got 13.5 MPG. So we were real pleased with mileage. So nothing too serious can be wrong. I have got 19.5 MPH running 70-75 MPH on the freeway empty.
Anyone have any input on this.
Thanks for everyones thoughts & wishes. I have a lot more confidence in the Blazer now. It is a keeper, I'll just fix whatever.
This trip was important to us because we are moving back to Nevada in 3 weeks. We have 2 trucks, 2 trailers, & a car, plus my Ninja. So getting my bike & trailer along with the Blazer moved was a great relief to me.
Again any input would be greatly appreciated.
Craig
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RE: WE MADE IT OK, BUT HAVE A QUESTION?? - 5/16/2008 6:29:43 PM
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4x4blazerguy
Posts: 188
Joined: 3/9/2008
From: EXIT 105
Status: offline
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No answers at all? I have talked to a few guys & the thought was possible spark knock. Anyone, out there?
Craig
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RE: WE MADE IT OK, BUT HAVE A QUESTION?? - 5/16/2008 7:08:43 PM
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Paddle_grl
Posts: 2942
Joined: 9/10/2005
Status: offline
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you really need to post this in the tech section...then people will give you answers...plus it's the weekend...people are doing things!
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dirty girls rule!!!!!
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RE: WE MADE IT OK, BUT HAVE A QUESTION?? - 5/16/2008 8:48:44 PM
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Thor_449
Posts: 225
Joined: 3/24/2008
From: Plymouth, Indiana
Status: offline
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i have no idea but what if the transmission was slipping? i know it doesn't usually make that kinda noise but.......at least it's a thought
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4.3L of 94 4x4 S10 blazer
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RE: WE MADE IT OK, BUT HAVE A QUESTION?? - 5/18/2008 10:53:51 AM
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4x4blazerguy
Posts: 188
Joined: 3/9/2008
From: EXIT 105
Status: offline
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Tranny appears to be fine, With a tranny slipping the RPMs I believe would of not stayed right on 3000 RPMs. It shifts real good. Thanks for the thought, I'll check it out a little closer.
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