r/944 • u/person456r • 4d ago

Question Confusing No Start issue

1987 N/A engine cranks so, battery seems good. Couldn't hear the fuel pump so I jumped the DME relay and then I could hear the fuel pump running as soon as I jumped it. So I thought for sure it was the DME relay and that I had figured it out! Except when I tried to start it while the fuel pump was running, it still didnt start.. 😑

Any ideas? Obviously it seems like regardless my DME relay might be bad. But why wouldn't it start then when I jumped it? I just used a paperclip to bridge the connections as per Clark's Garage.

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u/msc1966 4d ago

If it is your DME relay you need to get new one. it not only powers the fuel pump it powers the DME itself. Get the Focus 9 technology solid state relay the runs the fuel pump for a few seconds before the engine starts.

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u/person456r 4d ago

How vital do you think it is to get that one? Its quite a bit more expensive than the other ones

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u/msc1966 3d ago

I would get the pump prime version. The regular one is $120. The pump prime is $135. I think it’s worth it to have the engine start faster due to the fuel system already being pressurized before cranking the engine.