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No Start, replaced pulse sender and tried dme relay

kevin

kevin

New member
Well.

After a while I just knew this might happen, it will spin over great, but no spark nor fuel unless I jump the DMS relay.

Replaced the Pulse sender, as this is the obvious culprit, and for anyone else just buy the bracket as mine broke......the sender was glued in....


And now I'm at a loss, Hamilton and Palmer tell me they do not cut the ignition line only fuel pump and starter motor, so its unlikely to be that although the guy that fitted mine has retired from them.

Anyone any ideas, I still haven't been on the road this year, and the withdrawl symptons are ...........................unbearable.


TIA

Kevin
 
The only idea I can come up with is get it towed to your local Porsche Indy....that's what I would do.

Hope you get it sorted mate.
 
This from the book by Adrian Streather and so I claim no prizes.

If DME relay definitely ok then:

1) Ignition system failure (coil failure)
2) Fuel pump failure
3) Fly wheel speed reference sensor failed
4) Idle speed control valve failed
5) Throttle valve stuck closed
6) Resonance valve stuck open
7) DME control unit failed (URGH)

 
I take it the pulse sender being referenced is the crank position sensor. The gap between the sensor and the flywheel is critical, 1/8 of an inch if memory serves me well. If this is working then once the engine is spinning the second relay inside the DME relay will close, this sends power to the fuel pump. Take the plastic top off the DME relay and watch for one contact operating when the ignition is switched on followed by the second once operating as the engine cranks.
 
Thanks for the replies chaps, I thought the gap was 40thou, + or - a bit, its about 38 presently, but no DME action, unless I jumper it, or hold it deliberately closed.


Kevin
 
I think 30 thou or 0.8mm is correct but I cant find the info to hand. Regardless, if you take the plastic cover off the DME relay the bottom relay should engage when the ignition lights come on, the top relay will only engage when cranking the engine and the crank sensor sees the rotation. If the bottom relay is not operating then it may be an alarm / imobiliser problem?
 

ORIGINAL: ras62

I think 30 thou or 0.8mm is correct but I cant find the info to hand. Regardless, if you take the plastic cover off the DME relay the bottom relay should engage when the ignition lights come on, the top relay will only engage when cranking the engine and the crank sensor sees the rotation. If the bottom relay is not operating then it may be an alarm / imobiliser problem?
Click to expand...


Cheers, Hamilton and Palmer say they don't tap into that circuit, they fitted the piggyback which is essentially the PA2000? I think, but the old chap who did the work has retired, If the DME dosen't kick in after, I'll call them and discuss further works.


Cheers


KEvin
 
With my immobililizer the engine won't turnover if it's active. However it's an aftermarket one (Autowatch) so I don't know if the H&P one works differently? Just thought I'd mention that in case you're chasing a problem with an immobilizer when it might be something else?
 
It sounds as thought the DME is not receiving power, of course this can be caused by several things, can you bypass the aftermarket alarm with a key then try to start?
 

ORIGINAL: ras62

It sounds as thought the DME is not receiving power, of course this can be caused by several things, can you bypass the aftermarket alarm with a key then try to start?
Click to expand...


Not sure, I have been given pins to jump on the alarm circuit, but essentially its a PA2000 Porsche unit same as 993 I understand or BB II according to the installers cert.

It should disable the starter, but that works fine, hence the standard approach to fault finding, its a real pi33er as only a month earlier It had started after 4 months of being idle..


Ho hum, i now have al weekend to go a playing....


Cheers folks.

kevin
 

ORIGINAL: VITESSE

Yes-otherwise "wiggle " the connectors.[:)]
Click to expand...



Damn, no rev counter movement, I guess the new plugs and wiring will be checked later today, the new style is no longer plug and play unfortunately.


Thanks folks.

kevin
 
She lives...............W00t.


Turns out the new connectors have these funny single gaskets on them, and one of them had prevented the new connector pin from finding home properly, its a job to hear the click when they are pushed into place, and I just hadn't done the job well enough I guess,

Thanks very much for all your input guys, It is really appreciated.

Kind regards


Kevin
 
Well done Kev! Now that it's fixed, tell us what happens when the immobilizer is active? i.e. does the engine turn or do you get nadda?
 

ORIGINAL: Steve Brookes

Well done Kev! Now that it's fixed, tell us what happens when the immobilizer is active? i.e. does the engine turn or do you get nadda?
Click to expand...


When its imobilised, if i turn the key I get nothing, no DME relay activity, no engine relays, and no starter, to all intents and purposes dead as a dodo.

Kevin
 
After the help you guys have given, I'll put in my best word. See what the big fella can do.


K
 
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