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Old 12-27-2010, 09:24 AM   #1
brocsbar
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89 k5 blaz 5.7 backfire

89 k5 blaz 5.7 backfires out exhaust (i think) I did plugs wires cap rotor and fuel pump to no avail. the only code i get is 45 rich running. (so could it be running lean and the cpu is making it rich? It idles fine but when going down the road and i punch it ...it falls on its face and pops hesitates and backfires... I will check timing tonight as soon as i find the est wire which i hear is under the glovebox? Anyone have this problem and fixed it. Im thinking of cutting exhaust off and driving to see if it helps.
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Old 12-28-2010, 11:50 AM   #2
brocsbar
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Re: 89 k5 blaz 5.7 backfire

timing was off a hair EST wire was by brake booster for all to know (not glove box) 0 deg
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