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1997 Chevy Cheyenne Rough acceleration after replacing with

Tiny
KYREBELYELL2004
  • MEMBER
  • 1997 CHEVROLET CHEYENNE
Engine Performance problem
1997 Chevy Cheyenne 6 cyl Two Wheel Drive Automatic

Hello, I have a 1997 chevy 1500 truck. Just rebuilt the 4.6L vortec in it and replaced with an older model crank. I now have great ideling but rough acceleration. The truck can get to about 70 after it goes through the shifting of gears and what not. Could this problem be related to the crank? I know the older model cranks dont have the crank case sensors that the newer models have. Do you think this is the problem with my poor acceleration? If so, could I just replace the computer with an older computer and it run fine?
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Sunday, June 14th, 2009 AT 5:26 PM

3 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
You need to put the proper crank in it with the exciter ring on it for the crank position sensor to read. So I would call and get a price on a reground crank with the bearings.
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Monday, June 15th, 2009 AT 1:58 PM
Tiny
KYREBELYELL2004
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  • 2 POSTS
Thanks for the fast input, but could I not just change the computer to a computer out of a 94 chevy or so, and it run just fine?
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Monday, June 15th, 2009 AT 3:47 PM
Tiny
RACEFAN966
  • MECHANIC
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You can try to change computers but the two systems are completely different. One has throttle body injection and the other has multi port injection and is a vortec engine. 94 uses 15 psi fuel pressure the 97 used 55-65 psi fuel pressure. The 94 is an OBD1 system and the 97 is an OBD2 system they are just not the same. Sorry the only correct fix is the right crank.
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Tuesday, June 16th, 2009 AT 10:02 AM

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