12-18-2020, 06:57 PM | #1 |
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Location: Puyallup WA
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miss fire no code
i have a 97 silverado with a 5.7 in it with 215,000+ miles
i am getting a bad hesitation/misfire? when going from a stop. i am not getting a check engine light or anything. i got this truck not to long ago and wires cap look new i pulled a spark plug and looks new also. i dont want to just start throwing money at it. any suggestion? i didnt find a vacuum leak. |
12-19-2020, 02:27 AM | #2 |
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Re: miss fire no code
Do you have Access to a scanner You could see if it Has A miss Fire counter And it Will tell you what Cyl is miss firing, might even be a Injector
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12-19-2020, 11:02 AM | #3 |
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You mean "no CEL"
I have this problem all the time. 9 times out of 10 it's the cap and rotor. Don't ask me why it never gives a CEL. I haven't figured it out.
What I do know in my case was the vents in the replacement aluminum distributor got clogged and it killed caps and rotors in just 300 miles. Not kidding. GM released a service bulletin in the late 90's to remove the vent screens in the OEM distributor. First place to start is look at your cap and rotor. Just an FYI. I had a good cap go bad and replaced it with 3 different AC Delco caps before I got a good one. RIGHT OUT OF THE BOX. |
12-19-2020, 12:55 PM | #4 |
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Re: miss fire no code
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12-20-2020, 08:01 PM | #5 |
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Re: miss fire no code
I get a intermittent misfire on #6. Get the CEL. Changed cap ,rotor , wires and plugs and still happens. Going to check if still has vent and will remove if there. 1997 Silverado I think 5.0 engine?
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12-22-2020, 03:53 PM | #6 | |
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Re: miss fire no code
Quote:
Remember it takes 3 things to light off a cylinder. Spark fuel compression (some say air) The next logical thing if you have spark is fuel. Or should I say lack there of. If you had access to a good scanner, you could try shutting off the injector and turning it back on to see the change in idle. If you haven't used injector cleaner on a regular basis. I highly suggest putting 8 ounces in every tank for a few months. |
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