Problem...no spark...need diagnosing help

[Makenzie71]

Originally posted by carsontc
curious...do you know how old is the DME / Fuel Pump relay is ?

the distributor cap ?

the rotor ?

the spark plug wires ?

the fuel filter ?

if the answer to any of these is more than 5 years...you are taking chances

most worry about oil changes, air filter, spark plugs and with hope, timing belts

these other bits can and will bite you if ignored

The relay, though I think it's an original Porsche part, is spotless. I checked every component in there out and found nothing wrong with it what so ever. Everything else I believe needs to be replaced...but their wear would lead to a slow decline in performance, eventully preventing the car from running. Not a sudden stop as what happened with mine.

[carsontc]

Originally posted by Makenzie71
The relay, though I think it's an original Porsche part, is spotless. I checked every component in there out and found nothing wrong with it what so ever. Everything else I believe needs to be replaced...but their wear would lead to a slow decline in performance, eventully preventing the car from running. Not a sudden stop as what happened with mine.

so you believe "everything needs to be replaced"...probably close to 20 years old..."but their wear would lead to a slow decline in performance, eventually preventing the car from running. Not a sudden stop as what happened with mine"

I have changed my 'said' parts and can soak the balls off my engine compartment...but what do I know?

[Makenzie71]

That post really didn't make a lot of sense to me...but umm...not, not original stuff. The wires and plugs are not original...fairly recent with the wires, the plugs aren't worn, just noticeably old.

[livewirevoodoo]

WFIW... I had a similar condition Monday. Stopped at work for 15 mins to hand in an OT slip. Had been driving all morning, no prob. Try to start her up and she won't turn over. Called AAA for a jump, nothing doin. Had AAA tow her to my mechanic (best $70 a year i've spent on a car). 2 hrs later it's back up n running. He said it was the crankcase sensor. Dunno if thats been mentioned before under another euphemism.

Anyways.. Best of luck Makenzie. Hopefully its nothing too $erious. I am learnin alot about troubleshooting from this thread tho.

[Makenzie71]

Crankcase sensor? I'll have to do some looking on that. You happen to be willing to share your mechanic's name and contact info, would you?

[livewirevoodoo]

Sure...

Burnside Automotive
Tony Matthews
860-289-4590
360 Burnside Ave.
East Hartford CT

my future (hopefully) brother in law. he's owned a 944 or two before, so he knows them well. he had a black on black 928 on the lift when i went to pick my car up. i was hatin, lol.. it was gorgeous.

[porsche944speed]

drop a lit match down the gas tank that will take care of all ur problems you wont even need to spend 30 for a dme relay just a phone call the to the fire dept

[Makenzie71]

Unplugged one injector and the car hit, didn't start but you can definitely tell it hit. HAd no time, will look more into it monday. How exactly do I test the FPR?

[livewirevoodoo]

Clarks Garage - Fuel Pressure Regulator

[ae1969]

If it runs on 3 plugs it is usually a good indicator that it is the FPR as I explained a page or 2 back.

I would not start throwing parts at it until you can confirm that the fuel pressure is out of spec. You need a fuel pressure guage. This can be attached at the end of the rail.

[Makenzie71]

starting to irritate me...but at least I know where the problem lies. The injectors aren't firing. Which means either no fuel pressure or FPR is broken. Haven't gotten into it enough to test yet...todat I got to really touch the car for the first time since she went down.

I know now:

Turn key, no hit.
Spray B12 into intake, hits until b12 is gone.

[ae1969]

Originally posted by Makenzie71
starting to irritate me...but at least I know where the problem lies. The injectors aren't firing. Which means either no fuel pressure or FPR is broken. Haven't gotten into it enough to test yet...todat I got to really touch the car for the first time since she went down.

I know now:

Turn key, no hit.
Spray B12 into intake, hits until b12 is gone.

You haven't been reading............

Thats a bad MAC ............bad.

Did you check the voltage on the injectors.......... what did you get on both pins with the ignition ON

[Makenzie71]

...todat I got to really touch the car for the first time since she went down.