Cylinder 5 misfire 1998 Chevrolet Silverado 5.7

Asked by Lisa Dec 15, 2016 at 11:48 AM about the 1998 Chevrolet C/K 1500 Silverado Stepside 4WD

Question type: Maintenance & Repair

Can someone ease tell me why I'm always getting a p0305
misfire  what could cause #5 to keeping doing this

4 Answers

20

Did you change spark plugs and wires? If you do so, check compression

2 people found this helpful.
30

My 1998 has about 270000 on it I just replaced the spider injector but it was saying misfire on cylinder 5 running good has all the power it use to have thought this might help

3 people found this helpful.
20

You know had same problem. Did everything. Plugs wires ,vac.test.copression,fuel pressure ext.come to find out it was the spider injector for that cylinder. The plastic nozzle at the end was or had melted. I replaced just. One . Worked fine. If I had had the money I would have replaced the hole thing.

2 people found this helpful.
360

I don’t know if you ever found the problem.”, but it’s your fuel pressure regular under the upper intake plenum. It leaks raw fuel straight to a port that drains into cylinder 5. Makes for rough idle and bad exhaust smell. Should cost you about $75 to fix if you do yourself for the regulator and upper plenum gasket kit. Not too difficult, just take careful notes on what bolts come out of where in the plenum.

2 people found this helpful.

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