Slight mis-fire at partial throttle...until I disconnect air temperature sensor

Thank you Dr-DJet

I have done some of these things, but will continue with the check list you proposed.

Will update as I move along with testing.

Best
Samuel

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Hi Russel,

Did you manage to figure out what was/is wrong? I seem to have the exact same issue - namely that my engine runs significantly smoother and with no hesitation during acceleration with the air temp sensor disconnected than if it is connected. My fuel pressure is smack on 2 bar.

/Peter

I'm still tinkering.  I adjusted the MAP sensor to make it more rich (yes, I recorded where it was) and that seems to have addressed the problem, but I dislike my solution.  The MAP was replaced some time ago when the engine was rebuilt, and also tested since then, and the MAP was performing properly.  I will leave the adjustment for a while and if it truly resolves the problem, without adverse effects, then I'll leave it.  I just feel like I'm cheating.....but the last time I drove it everything performed well.

Hi,

I have seen so many detunged MAP sensors during D-Jetronic workshops. It is a bad US habit. And now ti hits me again on EHA in K-Jetronic.

Trouble is to find out whether it was detuned before you got it in your hands.

If memory serves me (and it doesn't always) I think I bought that from Mercedes directly.  The rebuild was in the early 2000's.

That doesn't mean it wasn't mucked with....but I would expect not?

I'll report back after I get a chance to drive it around some more,,,,especially in the heat.