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Old 10-20-2013, 12:13 AM   #11
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codes are 171, 300, and 440. Weeks history shows many misfires on all cylinders but most had less than 500, cyl 3 had 24000. that is in about 220 miles.
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Old 10-20-2013, 09:53 AM   #12
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What'* your fuel pressure KOEO?(KeyOnEngineOff)

If you can, swap #3 and #5 fuel injector and see if the majority of misfires follows to #5. If no change, move spark plug, then sparkplug wire.
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Old 10-20-2013, 12:29 PM   #13
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Fuel pressure with the key on, engine off is 45PSI,running is 40 and revving is 50.
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Old 10-20-2013, 09:42 PM   #14
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Pulled new spark plug from #3cyl and found everything gone, no wonder I had all the misfires. I checked 1 and 5 and those plugs looked good. Changed only 3 and cleared the codes. lean code 171 came back. Monday night I'll change all plugs and wires again and see what I get.
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Old 10-20-2013, 10:15 PM   #15
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Originally Posted by philter View Post
codes are 171, 300, and 440. Weeks history shows many misfires on all cylinders but most had less than 500, cyl 3 had 24000. that is in about 220 miles.
What scanner are you using that is able to read the misfire history numbers?
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Old 10-21-2013, 07:28 AM   #16
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lean code could be vacuum leak. since the 440 is just the non specific evap code i think i might block the vacuum tube that goes into the purge valve and see if it comes back. also inspect the boot that goes into the throttle body for cracks/dry rot. inspect the other lines as well, doesnt take much as they get older to leak because the rubber starts getting hard
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Old 10-21-2013, 09:46 AM   #17
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What scanner are you using that is able to read the misfire history numbers?
This was at a local garage, the same guy that did the smoke test for me. I'll find out the model, because we could look at how many millivolts ETc that were coming to each sensor. I'll stop by there Wednesday.
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Old 10-23-2013, 12:58 AM   #18
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Pulled new spark plug from #3cyl and found everything gone, no wonder I had all the misfires. I checked 1 and 5 and those plugs looked good. Changed only 3 and cleared the codes. lean code 171 came back. Monday night I'll change all plugs and wires again and see what I get.
i changed all the plugs and wires Tuesday night and found plugs 2 and 6 in the same condition as 3 was "no electrodes" gone. Started car and still obviously missing. These are AC delco 41-101 plugs and Belden Edge wires set 700042.

I don't know yet if plugs burned out again as soon as I started the car. The car ran smooth during driving with no lag and plenty of power but still acted like it was miss-firing at idle.
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Old 10-23-2013, 07:16 AM   #19
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i havent been a fan of delco ign stuff the last ten years or so. it certainly isnt the stuff you get on the car that lasts 100k. ive had pretty good luck with e3'* so far though, as far as lasting a long time and running smooth.
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Old 10-24-2013, 12:20 AM   #20
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What scanner are you using that is able to read the misfire history numbers?
Scanner is a Genisys scan system EVO 5.0
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