It's ALIVE! (And i need help)

Woohoo, finally got her to fire up last night. I think it's about time to put the exhaust on it



I'm having an issue getting the fuel pump to run, though. It's really weird--sometimes it will work, sometimes it won't. I'm thinking it might be related to the alarm system, but bypassing it doesn't work. The only way i've consistently been able to get the car to run is by jumpering 30 to 87b on the DME relay (fuel pump to battery). Unfortunately that just makes the pump run all the time!

I just cut the harness out of the old car and slapped it in the new car (kept part of the old car's wires so i would know which color to connect it to on the new car). So to that end, i'm pretty sure everything is wired correctly.

I'd like to get rid of some complexity and just wire straight to the fuel pump. Where do the wires for the fuel pump run on a '90 car (i'm sure other years are similar)? Any idea what color they are?

very nice, congrats

That's why I try to run everything around the DME relay, It is just a problem waiting to happen,
Congrats on getting it done so fast. Can wait to see some complete pictures of the car out side.
You changed the wheels , right?

Excellent.

Sorry, I dont have an answer for your FP issue. But I do like your rotors and calipers. Were the rotors ebay specials? Calipers look really good. I was thinking I would send my claipers out to be freshend up by this place: [You must be registered and logged in to see this link.]

I am just wingin it here, but you may want to change your fuel pump relay. It is in the fusebox under the hood in front of the driver. sometimes they get little bits of contamination that prevent the contacts from closing.

and how the hell am I guru status 2? geez, no respect.

That was fast! Congrats!

The fuel pump has two wires: 1.) Green/Black and 2.) Brown.
Brown is ground of course. You should be able to find the green/black pump wire as it comes forward from the rear of the car along the pass. side rail. Ill have to confirm this later.

Take the Fuel Pump Relay Control wire (Dark Green/White wire at pin 9 of ECU red connector C2) and connect it to a new relay at terminal 85. Then, attach the 944 green/black wire from the fuel pump to terminal 87 of the new relay. Then, connect a power wire from +bat through a 15A fuse to terminal 30 of the new relay and ground terminal 86 of the new relay.

Now the fuel pump circuit should be controlled only by the GM ECU and does not pass through the porsche central electric at all.

and how the hell am I guru status 2? geez, no respect.

Thanks everyone!

Yeah, the wheels are the last big thing i have to finish. They're going back to the stock silver color. That's the reason the car is still up on jack stands!

The back rotors are ebay specials, i forget the brand name on them but i'd remember if i saw it. So far no complaints! They only have like 1000 miles on them though. I painted my calipers with VHT, they were pretty easy. I'll see how it holds up!


Regarding the FP:
Whoops, edit! Looks like 944-LT1 answered my question. Thanks a lot!! I'll get that done and then she'll be ready to hit the road! (Well, a few little odds-and-ends first, but almost...)

I like pictars.... bettah

pictures always help!

This thread will be good reference! I'm saving a whole week for wiring de-bugging, hope it's enough.

That's awesome! I can't wait for mine to sound like that...

You should be able to find the green/black pump wire as it comes forward from the rear of the car along the pass. side rail. Ill have to confirm this later.

Nope. Sorry, not there. I guess the best way to get to the fuel pump wire is at the fuse panel.

Or do what I did, run new wiring, relays, etc. My car is 23 years old, went for reliability!

The easy way is to :
#1 Take factory Relay G5 (DME) and give it to charity.
#2 Make a new relay just like 944LT1 posted.
#3 connect terminal 87 of the new relay to pin #4 (Green/Blk) on the 14-pin connector as it is a tie-in to passenger side of fuse #34 (Fuel pump fuze from old DME)

Okay, will do...thanks guys!

xschop, that didn't work for some reason.

However, i did find the wire coming off the back of the fuse block that i needed to give power to. I forget the color code, but i could check real quick if anyone needs that info.

Green/Blk
What year is your car?

The 85.5 schematic shows that the Green/black wire splits after #34 fuel pump fuse and one goes to the fuel pump the other goes to pin #4 of the 14 pin connector

Mine's a 90. No biggie, though!

Oh, here's some pictures! Took her for a drive today, and got the alignment done. Very nice

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Still need to paint the front wheels back to the stock color, and i have a lip from TPC to install, and a million other little things, but it's a darn good start.

Looks amazing!

If all the current Porsche relays work will the wiring modifications listed in the conversion manual hypothetically take care of the fuel pump? If not, is the relay 944lt1 mentioned just a typical relay that happens to fit in the Porsche fuse box, or is it wired up in a different location. Will any SPST relay work?

Thanks,
Luke

I'm embarrassed to admit i don't have a conversion manual
My first car was done before they came out, and my second one was pretty much a bolt-in (everything came from the first car).
But, i think the relay 944-lt1 is referencing is just a standard relay that can be used, and it will not fit in the relay block.

Yes, he is referring to a standard rely, can be had at Radio Shack or any other electronic store, or at tyour local auto parts store, although they get a fortune for them. I buy my stuff at all electronics, a buck a relay, and they look better than Radio Shack or my local Advanced Auto parts. SPDT are the same price too, I needed a few for the fan relays.