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MAP sensor

  • packers1712
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4 years 9 months ago #14310 by packers1712
Replied by packers1712 on topic MAP sensor
I'm already running as advanced as I can! Have you ever encountered these symptoms where the FI has been a cause?

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  • Dr-DJet
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4 years 9 months ago #14311 by Dr-DJet
Replied by Dr-DJet on topic MAP sensor
Hi,

you cannot just put your ignition timing as early as possible. Those misfires will knock on your piston long before it reaches TDC and hit it.

What is your exhaust like with correct ignition timing? CO and HC if possible.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops Heizung/Klima 10.5.(HU), D-Jetronic 28.6.(F),20.9.(ER), K-Jetronic 31.5.(ER),23.8.(F)

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4 years 9 months ago #14312 by packers1712
Replied by packers1712 on topic MAP sensor
Hi,

Sorry no I don't have access to an exhaust gas analyser so I need to go to a garage to get CO and HC readings, could too far advanced cause a misfire do you think, I am running more than the manual says but it doesn't "pink" or pre-ignite I checked it whilst running the car on a rolling road dynamometer a couple of years ago.

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4 years 9 months ago #14313 by Dr-DJet
Replied by Dr-DJet on topic MAP sensor
Hi,

normally a misfiring in exhaust is unburned fuel from too late ignition or too much fuel as it could not be burned. You told us you pushed ignition timing to as much advanced as possible.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops Heizung/Klima 10.5.(HU), D-Jetronic 28.6.(F),20.9.(ER), K-Jetronic 31.5.(ER),23.8.(F)

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4 years 9 months ago #14314 by packers1712
Replied by packers1712 on topic MAP sensor
Hi,

Yes advanced not retarded, the manual suggests 0 degrees @850rpm I think but I set it at 3000rpm (max advance) which ends up at somewhere around 38 degrees BTDC that's about 10 degrees more than it should be but it was the only way I could get good driveability driving in town (low rpm on and off the throttle).

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4 years 9 months ago #14315 by Dr-DJet
Replied by Dr-DJet on topic MAP sensor
:NO: :NOTOKAY: :NO:
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops Heizung/Klima 10.5.(HU), D-Jetronic 28.6.(F),20.9.(ER), K-Jetronic 31.5.(ER),23.8.(F)

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