Petmerctech
06-30-2002 | 09:13 PM
#1
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Joined: Feb 2002
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From: 2000 ft over the Fl coast in a B-17
Petmerctech
First, let me thank you for taking the time to help us.
Second, I have an 01 clk 430 that has a twitching during idle (car will idle smoothy then the engine has a twitch then idles smoothly and twitches etc etc, you can actually see the engine twitch) that is most prevelant in park or neutral and quiets down when in gear. The car has no codes and the dealer replaced the ME control unit and mass aifr flow sensor but did not help, they also checked the motor mounts and said they were fine. The car has 15,000 miles and I'm the original owner. A can of fuel system cleaner was added by the dealer as well but to no avail. The car performs well with no hesitation etc. I have looked under the hood of another new 430 and noticed his engine twitch too while in park. This is my third 430 and I don't remember this being a problem. Please help.
RJC
Second, I have an 01 clk 430 that has a twitching during idle (car will idle smoothy then the engine has a twitch then idles smoothly and twitches etc etc, you can actually see the engine twitch) that is most prevelant in park or neutral and quiets down when in gear. The car has no codes and the dealer replaced the ME control unit and mass aifr flow sensor but did not help, they also checked the motor mounts and said they were fine. The car has 15,000 miles and I'm the original owner. A can of fuel system cleaner was added by the dealer as well but to no avail. The car performs well with no hesitation etc. I have looked under the hood of another new 430 and noticed his engine twitch too while in park. This is my third 430 and I don't remember this being a problem. Please help.
RJC
07-01-2002 | 04:33 PM
#2
Senior Member
Joined: Mar 2002
Posts: 392
Likes: 0
From: Belgium
RJC,
I already know that there are no fault codes, but someone should examine all values with the Star Diagnosis laptop.
Especially the spark tension and time of each cylinder, adaptation values (explained earlier) and so on. I have also explained that misfirings are always in memory, but you can manually change the sensitivity of that. If this is set to minimum sensitivity maybe some cylinders not firing so well do not become memorised? But I doubt this because USA emission laws are much more severe and the memorising of every misfiring is for these purposes.
Maybe you should just have the U-shaped tube (where the injectors are mounted on) off the engine and clean it thoroughly. When even a little piece of bad gasoline gets into there, it will not come out anymore until you remove that tube and clean it. This construction has no retour and when something gets there that does not belong there it will stay there. Also air in that tube can cause rough idle. You can bleed it with the valve that is mounted on that tube.
Whatever you do on that tube (I hope it is the correct word) keep it extremely clean, make sure nothing gets in it and use new seals.
When you use additives to clean or remove water, make sure that it are good products. I cannot give you examples because the products we use are not sold in the US. Water in gas: maximum 0,02%.
Patrick
I already know that there are no fault codes, but someone should examine all values with the Star Diagnosis laptop.
Especially the spark tension and time of each cylinder, adaptation values (explained earlier) and so on. I have also explained that misfirings are always in memory, but you can manually change the sensitivity of that. If this is set to minimum sensitivity maybe some cylinders not firing so well do not become memorised? But I doubt this because USA emission laws are much more severe and the memorising of every misfiring is for these purposes.
Maybe you should just have the U-shaped tube (where the injectors are mounted on) off the engine and clean it thoroughly. When even a little piece of bad gasoline gets into there, it will not come out anymore until you remove that tube and clean it. This construction has no retour and when something gets there that does not belong there it will stay there. Also air in that tube can cause rough idle. You can bleed it with the valve that is mounted on that tube.
Whatever you do on that tube (I hope it is the correct word) keep it extremely clean, make sure nothing gets in it and use new seals.
When you use additives to clean or remove water, make sure that it are good products. I cannot give you examples because the products we use are not sold in the US. Water in gas: maximum 0,02%.
Patrick
07-01-2002 | 07:46 PM
#3
Thread Starter
MBWorld Fanatic!
Joined: Feb 2002
Posts: 5,824
Likes: 262
From: 2000 ft over the Fl coast in a B-17
Originally posted by patrick
RJC,
I already know that there are no fault codes, but someone should examine all values with the Star Diagnosis laptop.
Especially the spark tension and time of each cylinder, adaptation values (explained earlier) and so on. I have also explained that misfirings are always in memory, but you can manually change the sensitivity of that. If this is set to minimum sensitivity maybe some cylinders not firing so well do not become memorised? But I doubt this because USA emission laws are much more severe and the memorising of every misfiring is for these purposes.
Maybe you should just have the U-shaped tube (where the injectors are mounted on) off the engine and clean it thoroughly. When even a little piece of bad gasoline gets into there, it will not come out anymore until you remove that tube and clean it. This construction has no retour and when something gets there that does not belong there it will stay there. Also air in that tube can cause rough idle. You can bleed it with the valve that is mounted on that tube.
Whatever you do on that tube (I hope it is the correct word) keep it extremely clean, make sure nothing gets in it and use new seals.
When you use additives to clean or remove water, make sure that it are good products. I cannot give you examples because the products we use are not sold in the US. Water in gas: maximum 0,02%.
Patrick
RJC,
I already know that there are no fault codes, but someone should examine all values with the Star Diagnosis laptop.
Especially the spark tension and time of each cylinder, adaptation values (explained earlier) and so on. I have also explained that misfirings are always in memory, but you can manually change the sensitivity of that. If this is set to minimum sensitivity maybe some cylinders not firing so well do not become memorised? But I doubt this because USA emission laws are much more severe and the memorising of every misfiring is for these purposes.
Maybe you should just have the U-shaped tube (where the injectors are mounted on) off the engine and clean it thoroughly. When even a little piece of bad gasoline gets into there, it will not come out anymore until you remove that tube and clean it. This construction has no retour and when something gets there that does not belong there it will stay there. Also air in that tube can cause rough idle. You can bleed it with the valve that is mounted on that tube.
Whatever you do on that tube (I hope it is the correct word) keep it extremely clean, make sure nothing gets in it and use new seals.
When you use additives to clean or remove water, make sure that it are good products. I cannot give you examples because the products we use are not sold in the US. Water in gas: maximum 0,02%.
Patrick
Thanks,
RJC
07-02-2002 | 04:33 PM
#4
Senior Member
Joined: Mar 2002
Posts: 392
Likes: 0
From: Belgium
RJC,
I have never "seen" someone called petmerctech on the MBworld Tech Talk Forum.
I do not know who he is, but I just replied because I have seen that your problem is not solved yet.
I hope that MB tech expert can help you. Will you let me know?
Patrick
I have never "seen" someone called petmerctech on the MBworld Tech Talk Forum.
I do not know who he is, but I just replied because I have seen that your problem is not solved yet.
I hope that MB tech expert can help you. Will you let me know?
Patrick
07-02-2002 | 06:27 PM
#5
Thread Starter
MBWorld Fanatic!
Joined: Feb 2002
Posts: 5,824
Likes: 262
From: 2000 ft over the Fl coast in a B-17
Originally posted by patrick
RJC,
I have never "seen" someone called petmerctech on the MBworld Tech Talk Forum.
I do not know who he is, but I just replied because I have seen that your problem is not solved yet.
I hope that MB tech expert can help you. Will you let me know?
Patrick
RJC,
I have never "seen" someone called petmerctech on the MBworld Tech Talk Forum.
I do not know who he is, but I just replied because I have seen that your problem is not solved yet.
I hope that MB tech expert can help you. Will you let me know?
Patrick
petmerctech replied to the instrument cluster post for the 240 looking for mbtech, I thought he may offer some additional info.
I will definetly let you know the outcome as I plan on seeing the service mgr next week and asking for the MBZ techincal specialist to check out my car. Any ideas why the car idles so much better when in gear than in park?
I'm sure if you had been working on my car it would be fixed by now
RJC
