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06-27-2009, 07:13 PM
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#1 |
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Registered User
Join Date: Nov 2006
Location: Amador County, Ca.
Posts: 229
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ODD problem-motor revs, rpms stay same
Ok, today we were driving back from the storage unit at about 55mph with a truck bed full of odd and ends and pulling a small harbor freight trailer total weight maybe 1000 lbs and its about 100 degrees outside.
About half way up a slight grade in the road the motor instantly reved up as if I had pressed the accelerator. It stayed like this for 20-30 seconds, then returned to normal. I hit another small hill and it did it again. This time I accelerated after it reved up and I was able to speed up without any apparent issues (which to me would rule out tranny). THE WEIRD THING... the second time it happened (didn't notice the first time) I was watching the tach and it didn't seem to move despite the motor getting louder??? The tach did go up when I would step on the accelerator. I had thought about torque converter, tranny, but the tach not changing has me confused. Tranny fluid is topped off and there is no discolor to it. Any ideas???
__________________
1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400 |
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06-27-2009, 07:36 PM
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#2 |
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dang its hot
Join Date: Nov 2006
Location: frankfort kentucky
Posts: 1,349
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Re: ODD problem-motor revs, rpms stay same
sounds like maybe the cluth fan engaged?
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06-27-2009, 10:35 PM
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#3 |
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Registered User
Join Date: Nov 2006
Location: Amador County, Ca.
Posts: 229
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Re: ODD problem-motor revs, rpms stay same
That is a logical explanation, that I overlooked. I guess it just startled me because we had been driving it all day and it just happened.
__________________
1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400 |
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06-27-2009, 11:33 PM
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#4 |
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Registered User
Join Date: Feb 2009
Location: washington the state
Posts: 730
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Re: ODD problem-motor revs, rpms stay same
what year truck and is it a TBI engine
__________________
my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG |
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06-27-2009, 11:50 PM
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#5 |
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Senior Member
Join Date: May 2004
Location: Caldwell,Tx.
Posts: 3,648
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Re: ODD problem-motor revs, rpms stay same
Sounds like the fan kicked in or the torque converter unlocked which it should under a load .
Frank
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Born and proudly residing in a Red State ! |
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06-27-2009, 11:50 PM
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#6 | |
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Registered User
Join Date: Nov 2006
Location: Amador County, Ca.
Posts: 229
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Re: ODD problem-motor revs, rpms stay same
Quote:
__________________
1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400 |
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06-28-2009, 12:33 AM
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#7 |
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Registered User
Join Date: Feb 2009
Location: washington the state
Posts: 730
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Re: ODD problem-motor revs, rpms stay same
my thought was if its a tbi engine with a electronic trans the temp sensor but being that you have a th400 its not going to shift your trans if your temp sensor was freaking out
__________________
my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG |
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