85' 3.2 Carrera - Engine won't fire when cold

[DRACO A5OG]

Congrats and keep us posted

[scarceller]

Originally Posted by LarsM

Alright,

Installed the new sensors and CHTS last evening. Now it fires right up!!
Let's hope that the problem is fixed by now.
I would also like to add some information for installation of the bracket to the speed and reference sensors;

I did not gap the speed sensor. The upper hole in the bracket for the upper bolt gives you some wiggle room. I used one hand to hold the speed sensor as far away from the crank as possible, then I tightened the bolts with my other hand. I knew that the consequence would be that the car wouldn't start, but I figured I try. It's only about 2 mm anyway.

Now, I'm a very happy man - thanks to you pelican guys! Saved me a lot of money too!

The gap spec is .8mm anything larger than this reduces the signal from the sensors and may cause drive-ability issues at lower RPMs. Find a washer that's just under 1mm thick and epoxy it to the end of the old sensor then set the gap correctly. If your at 2mm gap that's a bit wide and may cause issues.

[LarsM]

It may...
I'll see if it causes me some issues down the road. By now, it works just fine.

The sensors were quite difficult to fit in the bracket, had to use a significant amount if force. I wouldn't be able to use pliers to get a sensor out of the bracket when installed. That's the main reason I did it this way. I could only get the sensor 2-3mm from the bracket when using pliers.

I do respect the factory specifications. This time I worked my way around the issue.

You'll hear from me again if my installation is causing me trouble

[scarceller]

I usually use 600 sandpaper to clean up the two bores in the bracket so the sensors go in and out easily. Almost always I have to remove the bracket out of the car with the sensors on it. Then on the bench I remove the sensors and clean the bores in the bracket then install new sensors.

[LarsM]

Originally Posted by scarceller

I usually use 600 sandpaper to clean up the two bores in the bracket so the sensors go in and out easily. Almost always I have to remove the bracket out of the car with the sensors on it. Then on the bench I remove the sensors and clean the bores in the bracket then install new sensors.

I see. I used some lubrication. Problems in the future will cost me new sensors I'm afraid.

At least, now I know how it's done - and the BMW sensors works fine...

[Drisump]

Hey Lars, great to hear you've licked the problem!Well, it seems the rest of us "wrong posts" "got lucky" (page one). I understand that on a public board there is usually some bad advice, hell, I know I've given some. There are limitations of what can be accomplished over the net. Few, if any of us are Porsche factory technicians (and most have not, and do not make a living in the automotive repair field) and we offer willingly our thoughts on the problem.....a "virtual" version of a bunch of guys (some knowledgable and some not) standing in a garage over a comrades car offering our individual thoughts on a problem. These negative posts simply eliminate many users participation in the dialogue....even many knowledgable people who use this board often have second thoughts about posting. I happen to know a few. Thank you everyone for your participation.

[Drisump]

Originally Posted by hunlm

I'm interpreting your symptoms as, she cranks but doesn't fire...is that correct?
First of all, how old is your fuel?...

Funny guy...LOL. To clarify, "fire" meaning kick....as in stumble, as opposed to having a confirmed spark.

[LarsM]

Drisump,

I agree... Still, this is my hobby, my passion and something I would gladly spend a lot of time with both on and off road. I see people getting all fired up over eachother on forums. If you do not see the value in getting to know you 911 in any way possible (both mechanical and behind the wheel), you're missing out bit time. I really do appreciate others spending some of their time helping me out here in this forum. I love spotting an older 911 down the road and I'm sure others feel that way aswell...


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[Drisump]

Good stuff Lars....I've met a lot of people that have become very good friends since getting my first Porsche. Hopefully you've done the same. Cheers