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  #1  
Old 04-13-2010, 09:17 PM
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Hot and Cold idle miss on my D Jet

so I am thinking trigger points, a good cyber MB buddy here has provided me with a nice set to replace mine. These have the plastic cover in place over the points and see no way to remove it without breaking it off, I can spray cleaner in there , but no way to burnish the points. They look very clean. Anyone have luck with just a spray , and leave the plastic protection in place. I know that mine do not have this protection and part of the reason they get oil fouled. Mine are original 72 and I dont think they ever had a cover.
Looking for suggestions and been there done that advice.

Also will entertain any ideas on idle miss hot AND cold. Injectors recently been tested and refurbished

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  #2  
Old 04-14-2010, 09:04 AM
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I checked my '72 and they have the covers on them. I don't know if they were ever changed but can't see a reason why they would have been.

PN on dist. is 0 231 401 003

Last edited by rowdie; 04-14-2010 at 09:56 AM. Reason: number
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  #3  
Old 04-14-2010, 09:58 AM
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so am I correct, no way to "burnish" the points without removal of plastic?, or am I missing something.
This idle miss is perplexing. This morning it was cool so it took a little longer to get engine to temp, but I did not notice it today. I hit her hard on a straight section of road and she pulled hard and steady then I felt it not during idle but back down to speed and during acceleration ( not hard) . Almost feels like it is dropping a cylider.
What is confusing is that at times it run flawlessly. She is 38 years old , and may have to live with a few issues. Plus it is a DJET
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2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #4  
Old 04-14-2010, 10:12 AM
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I don't see a way to do it.
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  #5  
Old 04-14-2010, 10:18 AM
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I checked a write up over on benzworld and mbgram did not have the plastic covers on the trigger points he removed. Strange. I know your '72 is a lower number than mine.
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  #6  
Old 04-14-2010, 10:21 AM
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I cut some slots with a dremmel in my plastic cover so I could clean them.
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  #7  
Old 04-14-2010, 11:23 AM
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Gary , now that is an idea . Of course it opens it up to blowby , but why take them out if you cant clean them.

I am goign to start with trigger points for this miss thing. No other device in the DJET system would cause the symptoms that I can think of . TPS perhaps, MPS perhaps, OK strike that last comment
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2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #8  
Old 04-14-2010, 11:33 AM
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Why not just try cleaning them with a spray and trying them first before cutting the plastic.
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  #9  
Old 04-14-2010, 11:45 AM
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yup I will do that first . I thought I saw a good write up on the TPS cleaning and positioning , but for the life of me cant find it. I think I read that the TPS can also cause what I am having trouble with, so thought I would do both services
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2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #10  
Old 04-14-2010, 03:54 PM
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Quote:
Originally Posted by meltedpanda View Post
yup I will do that first . I thought I saw a good write up on the TPS cleaning and positioning , but for the life of me cant find it. I think I read that the TPS can also cause what I am having trouble with, so thought I would do both services
I had to search hard too Here it is:

http://home.cogeco.ca/~mbz/Adjusting%20and%20Cleaning%20TPS%20on%20R107%20Mercedes.pdf

My '72 SL was also missing a bit this Spring. I ran some injector cleaner through it and that helped. Hoping that a full tank of fresh gas will also help.

I have two sets of trigger points. One with plastic covers (on lower points only) and one with no covers. I have not tried cleaning the plastic covered points, but wondered if they could be immersed in a solvent? Maybe ina ultrasonic bath? I don't think they ever arc or wear, so they probably only need cleaning.

I attempted to adjust the old set (without the covers), but had wondered how I would ever be able to do that with the plastic covered ones. Probably have to destroy the covers

Good Luck!
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  #11  
Old 04-14-2010, 09:41 PM
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Thanks for looking Graham. I had some time today so I removed my dizzy and trigger points. My TP's looked worn and old compared to the other set I have. They were constructed different, the newer ones had lubrication arms and pads my original did not. Not sure if it was removed or just that way, and no covers.
I replaced them , retimed ( by ear) , checked dwell and such and I must say performs better, quicker acceleration and the miss is better but not gone. I dont think it is the TPS (since it is at idle ) and now think its not the trigger points, although the new set has helped. I guess it could be the ECU or injectors, not sure the MPS has much to do at idle. my injectors have been redone, only have 5000 miles on them
Anyone care to venture a guess?
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2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #12  
Old 04-15-2010, 09:55 AM
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Minor adjustment of the ECU could cure it. I played with mine and it helped. It should be done with an exhaust gas analyzer.
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  #13  
Old 04-15-2010, 10:03 AM
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Quote:
Originally Posted by rowdie View Post
Minor adjustment of the ECU could cure it. I played with mine and it helped. It should be done with an exhaust gas analyzer.
CO or AFR analyzer definitely helps, but adjusting ecu knob won't do any harm, so long as you note where it was to start. Usually one click either way makes a difference.
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  #14  
Old 04-15-2010, 11:16 AM
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True. And if I remember correctly it takes a few seconds for the system to adjust. It is not immediate.
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  #15  
Old 04-15-2010, 02:59 PM
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OK got to looking again at the ECU, for some reason she is turned all the way lean, that cant be right, I think I'll move it to mid position and see what happens work lean /rich from there. I have been thinking it sound like her fuel shuts down, perhaps leaned too much. I searched years ago around here for a CO analyzer to no avail. Anyone care to tell me how many clicks their ecu is say clockwise from full lean. That is the only adjust correct??

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Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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