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944S, won't start.

Fuel flow is good.
Spark is good.
Air is good.

Alright, so we just checked the voltage @ the injectors.

Clark's Garage (scroll down to "Other Fuel Related Problems") says there is supposed to be 12V on one terminal and 0V on the other, however, we are getting 12V on each.

I'm sure this has something to do with the DME computer? Or not?

Edit:
Thing is, it just stopped working - no warning or anything. I drove 222 miles home, ate dinner, drove about 4 or so miles to a friends house, and a few hours later, went to start it - nothing.

Last edited by Kerry944; 12-13-2005 at 09:38 AM..
Old 12-13-2005, 08:41 AM
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Alarm?

The reason I say this is my alarm box went bad and gave me the same problems. ClarksG. has a way too bypass it to check.
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Old 12-13-2005, 01:12 PM
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I have an alarm but it's not factory. It is currently off and has been for months.

When I jump terminals 30, 87, and 87b, what is the clicking I hear near the injectors? It's cylindrical and has a terminal going into it, below (but reachable) the intake.
Old 12-13-2005, 01:15 PM
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Sounds like your idle stabilizer?
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Old 12-13-2005, 01:31 PM
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Kerry944, I went through this about 2 years ago with my 944S....try DME eating 944S.......Why??
Lots of good info from F.R.Wilk and others particularly concerning dme grounding.

Pat
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Old 12-13-2005, 03:12 PM
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Yikes .....PM9146 where were you getting you DME's from?
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Old 12-13-2005, 03:45 PM
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Yeah, I read about 1000 threads today trying to figure out WTF is going on. We took out the DME and checked it out - seems to be alright.

Where are these grounds (3) that I should check?
Old 12-13-2005, 04:17 PM
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One-right next to the Battery on the body.(easy)
Two-right behind your intake manifold on the block near the firewall. (PITA)
Three-right behind the block ground a little further back from the block ground. (PITA)

You should be able to trace these wires from the battery.
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1987, 944S (168,000 miles)..sold
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Old 12-13-2005, 04:28 PM
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Also, check the resistor pack for the injectors. It is next to the cruise control servo. When you are cracking the car, you should be able to hear the injectors clicking like you would when it is running. Also.... had a 87 S do the same thing a few months back. Turned out to be FPR. Putting so much fuel out, that it was flooding the plugs
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Old 12-13-2005, 06:38 PM
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I'll check the grounds first thing in the morning.

The injectors are not clicking on crank. Like I said in my first post, we are getting 12V on each injector terminal when Clark's Garage says we should only be getting 12V to one terminal - not both (this is with the key in and in the on position).

I'll also look into the FPR.
Old 12-13-2005, 06:55 PM
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Check the flywheel sensors. They tell the DME when to provide ground to operate each injector.
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Old 12-13-2005, 07:02 PM
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Quote:
Originally posted by KY944S
Yikes .....PM9146 where were you getting you DME's from?
Well, as I recall I got one from a rebuilder whose name escapes me, and one from Oklahoma Foreign. My symptom was that the car would go dead rich on cranking and foul the plugs. After the second DME fried I got the info from Wilk and redid the grounding at the computer per his directions and no more problems. Sounds like a different problem here.

Pat
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Old 12-13-2005, 08:06 PM
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You only have 1 (one) flywheel sensor on the S, then you have a hal sensor on the backside of the cam housing.
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Old 12-14-2005, 12:37 PM
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Checked the ballast resistors, all good.

I guess my next step would be to actually test the fuel pressure.

pm9146,

Where were you getting DME Computers for $300?
Old 12-15-2005, 12:05 PM
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Also, any body know where I could rent/buy a DME diagnostic code reader?

I've searched, can't find anything.
Old 12-15-2005, 12:28 PM
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Quote:
Originally posted by Kerry944


pm9146,

Where were you getting DME Computers for $300?
I got one from Oklahoma Foreign, 1-800-462-2446, and I got the other one from N.P.C. in Houston, 1-866-326-4227

Pat
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Old 12-15-2005, 01:24 PM
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