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Ask Your Question1990 GMC Jimmy
Question: trottle body backfires and loseses pressure and cuts off
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Answer #1
sinautoscan.com October 01, 2009, 07:14Reply
Masteris the check engine light flashing ? if it is count the flashes write then down those are your codes then you can take it from there.
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Answer #2
Visitor, October 24, 2010, 17:04Had the same problem with my 1990. Check ur distributor cap and button.One or the other might be bad.
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Visitor, June 02, 2011, 16:23i just put a new cap, button, wires, plugs, fulfiller, EGR, and cat. what can it be
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Tj1988, March 07, 2012, 11:48
RookieMy 88 jimmy is currently in the shop now for the same thing. The exhaust valve seats were bad but that didn't fix it 100%... But there was some broken grounds... If u figure it out I would lik to know what it was
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Douglas Mazur, March 08, 2012, 14:26Reply
Rookieremoove valve covers.Cech valve hieght.If rocker to loose on exhaust when intake opens the cylinder pressure release through intake causing backfire through throttle body.Seen this many times Doug dkmazur@telus.net
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Answer #3
Douglas Mazur March 08, 2012, 14:15ReplyRookiePull valve covers.Jimmy is good for broken rocker [real cheap to repair] push rod comes partially through causing exhaust valve to not vent. On intake when intake valve opens pressure releases through intake.Seen this often
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