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I have a bad DME I'm pretty sure. Sudden loss of power, christmas tree dash.... pop the clutch and everything starts up again. Has happened 3 times. I like this option and just ordered one. I'll re solder my old one and put in the glove box. Any additional operational feedback would be terrific to hear about. Thank you.
I have a bad DME I'm pretty sure. Sudden loss of power, christmas tree dash.... pop the clutch and everything starts up again. Has happened 3 times. I like this option and just ordered one. I'll re solder my old one and put in the glove box. Any additional operational feedback would be terrific to hear about. Thank you.
You may want to start a separate thread. A faulty DME will not cause the christmas tree dash. The DME supplies power to the fuel pump and engine computer (aka DME). When the relay fails, the engine stops, not a loss of power.
As for the christmas tree effect, what are the ages of your spark plug wires and coils? This is caused by high voltage leaks, not the DME relay. I had the christmas tree effect on my cab. I replaced the wires and coils and the problem went away.
Last edited by Rocket Rob; 09-17-2020 at 11:42 AM.
You may want to start a separate thread. A faulty DME will not cause the christmas tree dash. The DME supplies power to the fuel pump and engine computer (aka DME). When the relay fails, the engine stops, not a loss of power.
As for the christmas tree effect, what are the ages of your spark plug wires and coils? This is caused by high voltage leaks, not the DME relay. I had the christmas tree effect on my cab. I replaced the wires and coils and the problem went away.
Thank you. It's a loss as in total loss of power, engine shuts off, christmas tree dash.... push clutch in, slow down let clutch out and all fires back up as normal..... unnerving for sure. Spark plug wires, and plugs are brand new but coils original. Thought about going to 993 coils but have read several threads that indicate a failing DME relay as well. Thought start there and then maybe move to coils. All ground wires checked, there, and tight.
I have the pump prime version for my 944 turbo track car, where the restrictive fuel pump check valve has been removed from the system. It's a huge improvement for that car since all the fuel pressure drains back to 0 almost immediately.
I bought the regular solid state version for my 911, because if the rest of the system is 100%, it shouldn't really matter. Adding the pump prime feature certainly shouldn't hurt anything, and it would definitely help as a band aid if any parts of the system aren't perfect.
This is helpful.
Any additional thoughts on the pump-prime version vs. regular? Thinking I might like to have one of these in the glove box just-in-case.
Yes, take the regular!
You want your engine to build up some pressure and get some oil flowing before firing up.
I really don't understand the use of a prime version of the relay.
I just ordered 2x Pre Prime for shipments to the UK for my 964 ( keep one as a spare )
World locations are all in the shipping drop down menu..very easy
Note; You just have to pay the import tax when it arrives ;-(
New Solid state DME's arrived this week - paid the UK import tax and UPS delivered all very quickly - thanks
Relay works a treat and yes you can hear the fuel pump prime (version purchased) and then stop after a few seconds ready for the key turn
As I purchased two Solid state DME's, I now carry the 2nd as spare ( after I tested that one as well ) and the old OEM Porsche version as a backup of the backup ;-)
Just to confirm what I’ve read. We don’t need to have to use the ‘pump prime’ version? I have a c4 so I hear the brake pump and would never hear the fuel pump priming. So I’m not entirely sure what the advantage would be?
I like the pump prime version, though I agree with the criticism. The thing is that you can choose whether to use the prime or not.
If my car has been sitting a while connected to my trickle charger, then I turn the ignition all the way (skipping the pump prime), let the starter turn the engine, circulate oil, and build up pressure before ignition.
If I’m making lots of stops and worrying my battery is being depleted faster than the alternator can charge it, but I’m confident the engine is well lubricated, I’ll use pump prime to ensure it ignites right away.
09-16-2020, 10:22 PM
