wesmc3

Turbo S, ran great. Parked on street, came back out to crank and no start, not even a sputter

It's not at the shop so I am stuck with the diag I can do on the street.

Had new ref sensors 3 or 4 years ago.

Fuel pump runs, I can feel the DME side of the relay click, no tach bounce when cranking.

Josh B

So it cranks but does not fire? Have you checked to see if you have fuel pressure at the rail? Spark at the plugs? Injectors getting pulse?

Crackership

Does the tach bounce when you crank?

IMB951

^That alone sounds like ref sensors...^


Check coil, check spark at plugs, jumper the dme to confirm fuel pressure at rail... everything Josh said.

Also push down on your plug wires to confirm the boots are snug. Pull distributor cap and check the metal contact on the rotor.

dillon410021

check fuses.

PorscheDoc

Check the harness connections to the S&R sensors on the DME side of the connectors. Could be a bad DME as well. Could have come over to help earlier today, but stuck at office now.

User 52121

Rule #1 when encountering a no-crank-bounce-start: jiggle the reference sensor wires. Before you do anything else.

I run into this on occasion with brand new sensors. I need to re-route them away from one another (when I have issues I find that the two wires are running right next to each other.) Just moving the wires around a bit takes care of it. Problem is - it's usually embarrassing when it happens so I'm usually trying to get out of there quickly. And then I don't think about it until the next time it happens.

wesmc3

I am at the OR today, that's why I don't have much to go on. Can't check much here.

Has fuel pressure, fuses are fine.

I pulled the harness, I had siliconed them in the spring but pulled em apart and re-seated them anyway. TPS and MAF as well. Thought about the DME, damn thing ran perfect here.

Guess I'm leaving it and getting the truck and trailer from the shop.

User 52121

Did you physically move the wires around a bit? Not just disconnect/reconnect the connectors? Try re-routing ONE of the wires (but not both.)

wesmc3

tried it too..no joy

Bri Bro

There are two relays inside the DME relay package. Just cause it clicks doesn't mean both are working. The DME relay controls power to the DME, injectors, fuel pump idle controller etc.