Kevin in Atlanta

According to the owners it ran until recently when the car was left outside.

They replaced the fuel pump. Silence from the fuel pump unless I jumpered it. Passed continuity from harness to relays and resistance tests for the CPS. So, I pulled the computers and it looks like water from a windshield leak got at least the Jetronic computer. The Jetronic is a rebuilt unit from 928Intl and somebody already had voided the warranty by breaking the seal and a few of the tabs. When I removed the cover this is what I see. Seems the putty is fine - found a picture on the jdsporsche site.

So, a pair of rebuilt computers are in my future.

James Bailey

windshield leak ??? far more likely the drain on the firewall for the wet well where the blower motor and wiper motor lives is blocked by debris and filled up too high...
And why would you need TWO brains ?? the ignition brains almost never fail. If you are currently parting out an 87 and a 91 ....I would think you might have spares..

Lizard928

The brain pictured is not rebuilt.

It is likely a leak from the recirc flap as mentioned above.

Kevin in Atlanta

I will look a bit closer. Both top edges of the computers are covered with oxidation and the screws were rusty. Want them both checked out.

John Speake

You mean both LH and EZK are affected by water ? Look at the pins on the 35way plugs on both units - are there corroded ones ?

Kevin in Atlanta

There was definitely corrosion on the Jetronic pins. The EZK pins looked ok, but given the corrosion on the outside I figured I would have them at least tested.

John Speake

Hmm, that's a significant repair, and those 35way connectors are not available as spare parts.

Kevin in Atlanta

When I say corrosion I am referring to a chalky white coating on a few of the pins.

SteveG

They left it outside . . . during Katrina.

Sorry, I couldn't resist. I hope it is not the case. But have you checked the CEP?

Kevin in Atlanta

I always think the worst, but I think we can rule that out. This car is so interesting. Autocheck confirms it is low mileage, but the poor thing was really mistreated. I found a oil change reminder for 2007 to change it @ 57k. Current mileage is 74ish. So it seems legit. Same two guys (neighbors) shared ownership since 2008. Have receipts for all kinds of work including a TT rebuild and powder-coated intake.

John Speake

Louie will need to inspect the units, the problem with the pins is that they are steel with a thin tin plating. Once the plating is eroded by water, the steel follows fast.

They often corrode badly where the pin enters the plastic housing, as the water gathers there.

As others have said, you need to unblock the drain for the heater box. I've attached a picture of its location.

soontobered84

(Posted for posterity's sake)John has posted a picture of the recirc flap for a RH drive car. The recirc flap for a LH drive car is in the corresponding place on the other side of the tunnel.

John Speake

Thanks John C. !! Yes, there is a slight, overlooked difference between LH and RH drive cars... :-)

Kevin in Atlanta

Still no start, no signal from LH computers. Suspect the CPS even though the test shows 965 Ohms.

In the meantime I pulled the fuel pump fuse and see it below. I need to deoxit the fuse panel and replace all the fuses for starters.

Findings.

Spark - Yes.
Injectors - Clicking
Fuel pump - runs when relay is jumped

No fuel at the rail. I guess that is a bad fuel pump, clogged fuel filter or line?

The fun continues...

John Speake

If it has spark, then CPS is fine. Do the injectors click when just ignition on, without cranking ? If so, that is LH ECU failure.