Mercedes-Benz 380SE
3.8L v8
MSII latest version
Wideband LC-1
remanufactured flow-matched ford 19lb injectors
Hi, I'm having idle setup dramas, I have the car set up for 4 squirts/cycle but i've had to set the injector opening time to 1.2 seconds to get a good idle. The idle is quite bad as well. I'm sure this is making up for a bad setting somwhere else, but not sure what. I noticed that the idle pulsewith is only 1.6-1.8ms, which I believe should be over 2 for proper tuning. When I set it to 2 squirts/ cycle the engine coughs and splutters and dies after about 10 seconds. If I have the car in gear and brakes on, with a little throttle, the engine seems to run fine.
How to increase the idle pulsewith?
-Thanks!
Mercedes 380SE idle PW setting it too low 1.9ms
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
-
Bernard Fife
- Master Squirter
- Posts: 475
- Joined: Thu Oct 29, 2009 12:54 pm
Re: Mercedes 380SE idle PW setting it too low 1.9ms
harlz,
MS-II does not have as serious issues with low idle as MS-I does. 1.6 to 1.8 milliseconds is not too low, in general.
However, to increase the idle pulse width you need to decrease the number of squirts. The standard recommendation is for 2 squirts alternating. You will have to retune the VE table to get a decent idle if you do that, there are instructions here: http://www.megamanual.com/ms2/tune.htm#ve But first set your injector open time to 1.0 then never change it again (unless you have a good reason to and some empirical evidence to back it up) - every time you change this to something else you have to retune the VE table (especially at low pulse widths). So go back to a reasonable opening time, and tune idle using the VE table instead.
Lance.
MS-II does not have as serious issues with low idle as MS-I does. 1.6 to 1.8 milliseconds is not too low, in general.
However, to increase the idle pulse width you need to decrease the number of squirts. The standard recommendation is for 2 squirts alternating. You will have to retune the VE table to get a decent idle if you do that, there are instructions here: http://www.megamanual.com/ms2/tune.htm#ve But first set your injector open time to 1.0 then never change it again (unless you have a good reason to and some empirical evidence to back it up) - every time you change this to something else you have to retune the VE table (especially at low pulse widths). So go back to a reasonable opening time, and tune idle using the VE table instead.
Lance.
"Never wrestle with pigs. You both get dirty and the pig likes it.” - George Bernard Shaw
Re: Mercedes 380SE idle PW setting it too low 1.9ms
Ok, I'll give that a shot, thanks.