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91 Bronco Check Engine/Transmission


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tmorris454
New User

Oct 2, 2007, 9:13 AM

Post #1 of 2 (1608 views)
91 Bronco Check Engine/Transmission Sign In

I have just purchased a 91 Bronco w/351 Windsor 4x4. Just lately the Check Endine light has came on shortly following with felling a significant bump when the Automatic transmission shifts from 1st to 2nd gear. Any suggestions?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 2, 2007, 9:36 AM

Post #2 of 2 (1604 views)
Re: 91 Bronco Check Engine/Transmission Sign In

91? Check for a fairly large vacuum leak. Manifold vacuum has to do with upshifting (if that was delayed it would be rough and the leak if substantial would trigger a CEL. Might be that simple,

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