Hi Guys,
My 300e has developed a problem with the fuel injection. At part throttle and under load, it leans out considerably, and feels like the fuel is cutting off. No pinging, and if you floor it, it revives with full power. So far I've replaced the coil, OVP, and fuel pump relay, and disconnected the EHA electrical connector, no change. The car has an Air/fuel gauge, so I can monitor the a/f ratio, and it is getting up to 19:1 plus. It is turbocharged, but this problem appears to be the stock fuel injection and irrespective of the turbos. Anyone have any ideas on what could cause a part throttle lean condition in the MB fuel injection?
Thanks
Scott

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Scott

1987 300e - The 200,000 mile TurboTechnics rocketship.

When was it changed last?

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J.H.
'86 300E

I did the fuel filter last about 3,000 miles ago, so it's very new. I was thinking that it might be something with the fuel delivery, but since it always runs fine at full throttle, it can't be starving for fuel constantly. And since the problem is linked to load, I'm of the mind that something with the CIS controls has gone haywire. What is the difference between CIS enrichment at part throttle and full?

I should also mention that the car has been exhibiting similar symptoms very occasionally over the past six months. Maybe once every two weeks over that time frame it would bog down for 10 seconds then revive. In the middle of a 1,500 mile road trip three weeks ago it went from once in a while to constant. If you're going up a hill the car needs to be going full throttle, otherwise you can't give it enough gas to maintain speed. I did try to listen for ping, and there is none.

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Scott

1987 300e - The 200,000 mile TurboTechnics rocketship.