HELP - field repair - TDC and speed sensors
 

Can it be done in a parknig lot? With the Porsche tool bag?

Anyone?


I got Shatz & Krum http://www.schatzandkrum.com (Sacramento area mechanic, they are only 1.2 miles away from the car) to "loan me" a TDC and speed sensor. JIm said if they work, I buy them, if not then return them. :thumb:

Shatz and Krum can't even do a diagnosis until next Tuesday.

Hopefully, my friend will be able to loan me his DME tonight, else I gotta' get it towed.

If nothing else, tell me what's involved if I can R&R these with the engine in place.
Thanks.

You should be able to replace/service both sensors without dropping the engine, but I think it would be extremely difficult to do so in a parking lot. I'd tow it to a shop and do the job on a lift...I believe they are located on the left (driver's) side of the engine on the flywheel, close to no. 3 cylinder and pretty high up on the engine. What exactly are your symptoms???

You can't be serious, can you?

As M. Morrison mentioned, what are your symptoms to lead you to the sensors?

Not sure if you can replace them without a partial engine drop or not. Here is a picture that shows their location (circled in green).
http://forums.pelicanparts.com/uploa...1101954050.jpg

I would at least tow it home.

"As M. Morrison mentioned, what are your symptoms to lead you to the sensors?"

Right-On!

Some more shotgun troubleshooting -

Luckily a DIYer is doing time & money wasting.

Thanks for the replies guys, actually here is my previous thread...
http://forums.pelicanparts.com/porsche-911-technical-forum/194400-intermittent-no-start-fail-running.html

Well... I have checked all but the computer and the two sensors, as I don't have a scope.

I have checked:
Full throttle switch - Continuity when open all the way, else open in any other position --GOOD!

Idle switch - continuity when closed, else open --- GOOD!

CHTS 2400 ohms at 60 degree F --- GOOD!

Volume Air Flow Sensor (VAFS) - various ohms --- GOOD!

Intake air temperature inside VAFS --- 2500 ohms at 60 F ---- GOOD!

ISV - hums with ignition in the ON position --- GOOD!


So I have a computer, ignition coil, ignition pickup(ref sensors-then), left... correct?

I am going to check the ignition coil now.

Just before I got it home on the a little rental trailer (yes they do actually fit, but it scraped up my front lip), I found a GAS LEAK! AHHHHHhhhh

And when it barely ran it RAN SOOOOOOO RICH! Black smoke, and I can smell RAW fuel out the exhaust.

This is not the symptoms I had before.
Before, I would be driving and all was well, then either the ignition OR computer would die for 1/2 a second, then suddenly it would run again.

Rich running is often a symptom of a faulty CHT signal. Check the CHT resistance at the DME connector. By the way, you don't have an ignition pick-up, that's what the flywheel sensors do.

Mine did the same really rich run, and my CHT showed good at the connecter. I finally found a broken wire on the harness side of the CHT connector. I fixed it and all was well.

Tim

Thanks Tim.

Tomorrow night I will pursue the values and see if they are the same between what I got at all the sensors and coil, and what the DME "sees".

Thanks

BAD COMPUTER...

Swapped it with a newly found friend's computer.