flashing CEL only in 6th gear at 38-3900 rpm
It strikes me that this is a sensor issue rather than a misfire, but wanted to run it by others with more experience to make sure it makes sense.
04 6mt, 40k on reman, compression test within the last thousand miles. I typically run at 77/78 on the highway, which puts me just under 4k rpm. Occasionally I get a flashing CEL without a noticeable stumble or change in note. If i drop down to 3k or shift it goes away. I cannot replicate it in any other gear, having tested 5th on the highway for 5-10 minutes at a time, and 3/4 on secondary roads when the urge strikes. has anyone experienced a similar problem? thanks |
It's a misfire. Search.
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A flashing CEL is pretty much always a misfire. When did you last replace your coils, wires, and plugs?
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thanks for the replies.
I asked the question because I had not seen others with such a specific gear/rpm combination in the flashing cel threads. however I recently took it on a longer drive and got a flashing cel above 4500 rpm in third, so it seems to be garden variety misfire. I replaced the coils, wires and plugs last summer, so they have a couple of thousand miles. I will go through the suggestions in the other cel threads. Got distracted from the problem with some recent snow, and I picked up an 89 saab 900 convertible yesterday, but it should be warm soon and I'll get it sorted in time to run some autox at pitt race. |
Originally Posted by Squirrel chaser
(Post 4747044)
thanks for the replies.
I asked the question because I had not seen others with such a specific gear/rpm combination in the flashing cel threads. however I recently took it on a longer drive and got a flashing cel above 4500 rpm in third, so it seems to be garden variety misfire. I replaced the coils, wires and plugs last summer, so they have a couple of thousand miles. I will go through the suggestions in the other cel threads. Got distracted from the problem with some recent snow, and I picked up an 89 saab 900 convertible yesterday, but it should be warm soon and I'll get it sorted in time to run some autox at pitt race. |
My CEL is indicating misfire in 6th gear as well. Sometimes while accelerating, sometimes while cruising, sometimes while decelerating...sometimes not at all.
Usually it just lasts for a few seconds at a time then goes away, but once in a while the CEL stays lit after the flashing stops. There is no noticeable change in performance. For my ignition I'm running the IGN-1A setup from Sakebomb. It has never given me any problems. I just tested all coils & plugs using the HEI tester for rotaries. When I pull the DTCs I get: P0301 "cyl. 1 misfire detected" (the culprit. "cyl.1" being rear rotor, I believe) P0410 "secondary air injection sys." (air pump delete) P0442 "evap. emission sys. (small) leak detected" (not sure...have found 0 vacuum leaks) P2270 "O2 sensor signal biased/stuck lean" (cat delete) Side note: I have the O2 sensor code and air injection code masked, but they're always there even if the CEL doesn't come on. Have checked e-shaft sensor. Compression tested - good Fuel pump is good, only a couple years old, never run below 1/4 tank. Premix - YES Plugs were replaced prolly 5k mi ago. When I pulled them for the comp. test they seemed darker than brown -- almost black, but not "chunky". Am going to go clean MAF sensor now. Anything I'm missing? I'm open to all ideas/suggestions. Thanks guys. |
resetting the ESS profile (NVRAM) may fix the flashing misfire CEL issue
Resetting the ECU anytime the ignition/timing system is altered this should be done, including the trigger wheel/main pulley, sensor, plugs, coils, plug wires, etc. or the flashing misfire CEL too . |
Thanks Team. Up until reading your link I had just assumed that the NVRAM gets reset anytime I flash a new tune, but I'm happy to learn I was wrong.
Gonna try it tonight & see if it helps. (I have a good feeling about this!) Will keep you posted. |
UPDATE:
Yep... that dun done the trick! Definitely the suggestion of the year in my book. If you were within a 100 mile radius of me I'd buy you a beer, or whatever your imbibitional beverage of choice may be. Thanks again! |
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