flashing CEL only in 6th gear at 38-3900 rpm
#1
Registered
Thread Starter
Join Date: Feb 2015
Location: WV
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
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
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
#4
Registered
Thread Starter
Join Date: Feb 2015
Location: WV
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
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.
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.
#5
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.
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.
#6
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.
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.
#7
No respecter of malarkey
iTrader: (25)
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
.
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
.
Last edited by TeamRX8; 02-04-2022 at 02:12 PM.
#8
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.
Gonna try it tonight & see if it helps. (I have a good feeling about this!)
Will keep you posted.
#9
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!
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!
Thread
Thread Starter
Forum
Replies
Last Post
candsmain
Series I Trouble Shooting
3
03-24-2011 04:08 PM