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04-14-2019, 09:55 AM
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#1 | |
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AF Newbie
Join Date: Jul 2004
Location: Omaha, Nebraska
Posts: 47
Thanks: 1
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Flashing Check Engine Light - No Trouble Code
'02 bought in '05 4.3L 6cyl 97k mi
A year or so ago, the Check Engine started flashing when I wound it up to 3000 rpm and at about 90 mph for about 20-30 seconds. I slowed and the flashing light went out. Ran OK. Yesterday, uphill, against the wind at about 2600 – 2800 rpm and 75 mph it happened again, I slowed and the light went out. Ran at 75 mph no problem Both times, I scanned and found no trouble codes. The truck ran fine and runs fine now. Any ideas / suggestions? Thanks. |
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04-14-2019, 03:52 PM
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#2 | |
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A990 racer
 Join Date: Mar 2002
Location: Chestertown, New York
Posts: 17,051
Thanks: 26
Thanked 383 Times in 374 Posts
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Re: Flashing Check Engine Light - No Trouble Code
pcm is flashing as a result of what it perceives as a random misfire, scan it for misfire counts.
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04-15-2019, 08:03 PM
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#3 | |
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Registered Offender
Join Date: Mar 2006
Location: Rural
Posts: 6,562
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Thanked 346 Times in 341 Posts
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Re: Flashing Check Engine Light - No Trouble Code
...Also a lean or rich condition beyond range. It's a warning of a pending code, not a stored code.
A good scanner will display pending codes as well as stored codes.
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