Strange issue
#1
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Strange issue
Hi there,
I had a time to "play" with the car recently, and came up to a strange situation.
As I had to replace the A/F sensors (changed them both), I managed to get my hand on Techstream software and a cable.
I run a diagnostic, and no errors were shown. That made me happy, of course.
Then I run a live test, and it shown up occasional misfire on 1,2 and 5 cylinders. I changed the spark plugs, without making any difference.
Did the test again, and no errors were recorded, but during live test, the same misfire was shown.
I was advised to change the coils, but before doing it, I would like to get any advise (if possible).
Thanks.
I had a time to "play" with the car recently, and came up to a strange situation.
As I had to replace the A/F sensors (changed them both), I managed to get my hand on Techstream software and a cable.
I run a diagnostic, and no errors were shown. That made me happy, of course.
Then I run a live test, and it shown up occasional misfire on 1,2 and 5 cylinders. I changed the spark plugs, without making any difference.
Did the test again, and no errors were recorded, but during live test, the same misfire was shown.
I was advised to change the coils, but before doing it, I would like to get any advise (if possible).
Thanks.
#4
Moderator
I am stumped ,,, if they were on the same back 1,3,5 or 2,4,6 then OCV would be the prime suspect. When were the plugs replaced ... 110k miles is the recommended interval.
Salim
Salim
#6
Moderator
May I ask which brand?
With 3 cylinders misbehaving, swapping has its own challenge. With one bad it is easy (other than cylinder #3 )
Salim
With 3 cylinders misbehaving, swapping has its own challenge. With one bad it is easy (other than cylinder #3 )
Salim
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#8
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Ignoring techstream for a bit, is your CEL lit up or flashing (misfires among other things). I am questioning the validity of the data.
Salim
Salim
#9
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There is no CEL at all, and Techstream shows no error codes recorded.
The misfire in live data is not constant but occasional, and counts when rev the engine. At idle speed I do not recall any counts.
That's why I wonder if the coils are the reason.
The other thing is the high fuel consumption (if the display readings are credible). The car is driven by the wife, city only and in a short distances. I never read less tha 21l/100 km. Once we drove the car outside the town, and for 240 km I got 12,4l/100 km with normal driving (100-120 km/h).
The misfire in live data is not constant but occasional, and counts when rev the engine. At idle speed I do not recall any counts.
That's why I wonder if the coils are the reason.
The other thing is the high fuel consumption (if the display readings are credible). The car is driven by the wife, city only and in a short distances. I never read less tha 21l/100 km. Once we drove the car outside the town, and for 240 km I got 12,4l/100 km with normal driving (100-120 km/h).
#10
There is no CEL at all, and Techstream shows no error codes recorded.
The misfire in live data is not constant but occasional, and counts when rev the engine. At idle speed I do not recall any counts.
That's why I wonder if the coils are the reason.
The other thing is the high fuel consumption (if the display readings are credible). The car is driven by the wife, city only and in a short distances. I never read less tha 21l/100 km. Once we drove the car outside the town, and for 240 km I got 12,4l/100 km with normal driving (100-120 km/h).
The misfire in live data is not constant but occasional, and counts when rev the engine. At idle speed I do not recall any counts.
That's why I wonder if the coils are the reason.
The other thing is the high fuel consumption (if the display readings are credible). The car is driven by the wife, city only and in a short distances. I never read less tha 21l/100 km. Once we drove the car outside the town, and for 240 km I got 12,4l/100 km with normal driving (100-120 km/h).
Last edited by AnthonyMtz; 03-15-16 at 02:08 AM.
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