1989 300TE stalled doing 75 MPH - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 04-26-2019, 01:36 PM Thread Starter
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1989 300TE stalled doing 75 MPH

Had a rather harrowing experience today stalling at 75 mph in the left lane of 3-lane traffic (yeah I was passing). Somehow made it to the right shoulder, but this just can't happen, especially with my son behind the wheel. Here are the symptoms. Any ideas on a diagnosis would be greatly appreciated.

* Car stalled a couple of times at low-speed (10-15 MPH) 2 months ago.
* *All* the dash lights came on then, and was the same case today.
* Starts right back up (with a little extra cranking than normal) and seems to run completely normally.
* Based on several threads here, I swapped out the OVP with a Mercedes OVP from Pelican Parts. No more stalling until today, and patted myself on the back, thinking the problem was solved. I don't think it's the OVP.

Thanks a lot for any insight.

Dack
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post #2 of 13 (permalink) Old 04-26-2019, 05:26 PM
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What is the voltage at the battery with the car running and electrical consumers like headlights, blower motor running etc..It needs to be 13.4v at a minimum. Have the fuses been replaced with copper ceramic type?

These cars are very sensitive to correct, constant voltage.

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post #3 of 13 (permalink) Old 04-26-2019, 06:22 PM Thread Starter
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Wow Jayare, thanks for the tip on the fuses. I have read loads of posts on stalling since it first happened and have not seen them as a possible cause. I will start there. Mine are certainly the original aluminum/plastic.
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post #4 of 13 (permalink) Old 04-26-2019, 06:26 PM
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Originally Posted by dack View Post
Wow Jayare, thanks for the tip on the fuses. I have read loads of posts on stalling since it first happened and have not seen them as a possible cause. I will start there. Mine are certainly the original aluminum/plastic.
As important or more so is the running voltage. Hopefully you have a multi meter.

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post #5 of 13 (permalink) Old 04-26-2019, 07:27 PM
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Fuel pump relay
Black Swan likes this.

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post #6 of 13 (permalink) Old 04-26-2019, 07:54 PM Thread Starter
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Thanks tuttebenne. I should've noted that the fuel pump relay was replaced as part of a nightmarish running issue that was successfully resolved in 2018.
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post #7 of 13 (permalink) Old 04-27-2019, 04:19 AM
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Thanks tuttebenne. I should've noted that the fuel pump relay was replaced as part of a nightmarish running issue that was successfully resolved in 2018.
What is the date code on the one you replaced the FPR with?

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post #8 of 13 (permalink) Old 04-27-2019, 07:34 AM
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Ignition control module?

I've had similar issues as you and it certainly is alarming at high speed. Over the years I've resoldered and replaced OVP and fuel pump relays but still had this issue. It was resolved by replacing the ignition control module.
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post #9 of 13 (permalink) Old 04-27-2019, 07:44 AM Thread Starter
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What is the date code on the one you replaced the FPR with?
Hey Tuttebenne I removed it this morning and did not see any date code on the part (or at least anything I recognize as a date code). Here is a picture. Any clues?
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post #10 of 13 (permalink) Old 04-27-2019, 12:20 PM
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Hey Tuttebenne I removed it this morning and did not see any date code on the part (or at least anything I recognize as a date code). Here is a picture. Any clues?
I see what you mean. I checked a couple of spares that I have and of the black plastic cover type, I have a KAE and an original Mercedes relay. The KAE has a date code painted on it but the one from Mercedes only has a very small stamped code right under the bar code in your picture. Mine says "069C" but I don't know what that means. I see yours has a stamping too but I can't help you figure out what it means. The old metal cover type had a date code printed on them. Sorry I can't be of more help. But what I could offer is the next time it stalls, as you safely coast to a stop, before you restart the car, see if you can hear the fuel pump(s) running. I know that in some situations this might not be possible to hear or you might just want to "get the hell out of there" but its a suggestion nonetheless.

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