Seeking opinions or suggestions regarding a misfire
06-22-2020, 07:11 PM
#26
MBWorld Fanatic!
Honestly to me the worst part of swapping plugs is trying to get the plug wire boots off with out leaving the crimped terminal behind ! Even though they are off every year there still a bear !
07-29-2020, 08:36 PM
#27
Super Member
Thread Starter
There is a MB-branded green lubricant paste you're supposed to put on the boots which lets them slip on/off easily. WIS procedure says to use it. Part 002-989-80-51
07-29-2020, 08:40 PM
#28
Super Member
Thread Starter
The misfire is back full-time once again. I'm less than thrilled.
Now I'm thinking of two possibilities:
1. Do a leak-down test to see if this is a piston ring issue. It would perhaps explain the cold/warm differences in this. Although sometimes it seems to be solved by an engine restart, perhaps there is some adaptation in the ECU to pull timing on a cylinder when detecting issues, and if I restart it then maybe it doesn't detect issues and operates normally?
2. Perhaps the ECU itself is bad, and is either signaling the cylinder 8 injector incorrectly, or with voltage which damages the injector. I'm not too hot on this theory, but something to consider.
Now I'm thinking of two possibilities:
1. Do a leak-down test to see if this is a piston ring issue. It would perhaps explain the cold/warm differences in this. Although sometimes it seems to be solved by an engine restart, perhaps there is some adaptation in the ECU to pull timing on a cylinder when detecting issues, and if I restart it then maybe it doesn't detect issues and operates normally?
2. Perhaps the ECU itself is bad, and is either signaling the cylinder 8 injector incorrectly, or with voltage which damages the injector. I'm not too hot on this theory, but something to consider.
07-29-2020, 10:58 PM
#29
The misfire is back full-time once again. I'm less than thrilled.
Now I'm thinking of two possibilities:
1. Do a leak-down test to see if this is a piston ring issue. It would perhaps explain the cold/warm differences in this. Although sometimes it seems to be solved by an engine restart, perhaps there is some adaptation in the ECU to pull timing on a cylinder when detecting issues, and if I restart it then maybe it doesn't detect issues and operates normally?
2. Perhaps the ECU itself is bad, and is either signaling the cylinder 8 injector incorrectly, or with voltage which damages the injector. I'm not too hot on this theory, but something to consider.
Now I'm thinking of two possibilities:
1. Do a leak-down test to see if this is a piston ring issue. It would perhaps explain the cold/warm differences in this. Although sometimes it seems to be solved by an engine restart, perhaps there is some adaptation in the ECU to pull timing on a cylinder when detecting issues, and if I restart it then maybe it doesn't detect issues and operates normally?
2. Perhaps the ECU itself is bad, and is either signaling the cylinder 8 injector incorrectly, or with voltage which damages the injector. I'm not too hot on this theory, but something to consider.
07-29-2020, 11:10 PM
#30
Super Member
Thread Starter
A few years ago I had the extended recall fuel tank service, so it does have a new tank and senders.
08-01-2020, 01:29 PM
#31
Super Member
Thread Starter
Thanks for your other thread @drothgeb - https://mbworld.org/forums/w211-amg/...ify-parts.html
That was probably the root of my issues. One finally full-throttle kickdown hoorah sometime in May and then constant problems.
That was probably the root of my issues. One finally full-throttle kickdown hoorah sometime in May and then constant problems.
