HELP - field repair - TDC and speed sensors

[nhromyak]

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.

[curiousone940]

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???

[kqw]

You can't be serious, can you?

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

[Rot 911]

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).

[yelcab1]

I would at least tow it home.

[Lorenfb]

"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.

[nhromyak]

Thanks for the replies guys, actually here is my previous thread...
Intermittent NO START, and fail running

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.

[Tim Polzin]

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

[nhromyak]

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

[nhromyak]

BAD COMPUTER...

Swapped it with a newly found friend's computer.