Flashing check engine - no codes
#1
Flashing check engine - no codes
Hi,
1998 5.9 178000 - yesterday I did a fill up 20+ gallons drove about 3 miles and hopped on the interstate and the check engine light started flashing and the engine started stumbling once I got up to 70 mph. Almost like bad or no fuel. I slowed down to 60 and the stumbling ( the whole truck was vibrating violently) stopped. After this the truck ran fine - smooth running all the way up to 80 mph.
The next day a code scan showed no codes. The fuel pump is original I'm thinking it may be on the way out. Any ideas?
The plenum has never been replaced I'm pretty certain it needs it, as a quart of oil occasionally disappears every 1-2k miles.
Also in the ~18 years I've owned the truck the check engine light has never come on.
Thanks, Jim
1998 5.9 178000 - yesterday I did a fill up 20+ gallons drove about 3 miles and hopped on the interstate and the check engine light started flashing and the engine started stumbling once I got up to 70 mph. Almost like bad or no fuel. I slowed down to 60 and the stumbling ( the whole truck was vibrating violently) stopped. After this the truck ran fine - smooth running all the way up to 80 mph.
The next day a code scan showed no codes. The fuel pump is original I'm thinking it may be on the way out. Any ideas?
The plenum has never been replaced I'm pretty certain it needs it, as a quart of oil occasionally disappears every 1-2k miles.
Also in the ~18 years I've owned the truck the check engine light has never come on.
Thanks, Jim
#2
Flashing CEL indicates misfiring. That is where the violent shaking comes from. It may have just been a fluke, since after you slowed down, it quit doing it.
Fix the plenum, as that is a likely contributor to the problem, and also replace at least the front O2 sensor. Then it's just going to be a waiting game, to see if the problem recurs.
Fix the plenum, as that is a likely contributor to the problem, and also replace at least the front O2 sensor. Then it's just going to be a waiting game, to see if the problem recurs.
#4
#5
#6
#7