air sensor plate issue? - Page 2

afterburn 549 · 11-15-2008, 08:36 AM

I do not know why L.T. is the best wrench in the world .Maybe a some expert will appear here and say why. All I know is I put in and on every thing except maybe my coffee !
LOL
I learned this from a old friend 30 years ago

ruf-porsche · ruf-porsche's Garage

Carry a portable fire extinguisher in the car.

afterburn 549 · 11-15-2008, 09:35 AM

For the gasoline in the tank in front of me ?? OK I do allready

1982911SCTarga · 11-15-2008, 09:47 AM

Quote:

Very interesting about CIS set up and thats why Porsche engineering guy stayed in the lab 24/7 and probably turned in a millionaire guy?

Actually, the engineers at Bosch developed it and it was widely used in its day.

Glad to hear you've made progress.

Brian

fastfredracing · 11-15-2008, 02:11 PM

A little off topic, but anyone know if the 930 FD is different. I think I have heard that there is actually a rubver seal splitting the halves, and a 930 fuel distributor is servicable. I have succesfully rebuilt one 928 FD ( dissasembled , cleaned and reassmebled) but I have tried two 911 fd's and both ran , but leaked. I think that John Walker may have stated that He used a little loctite 574 on the fuel head halves to help with sealing. I have not tried this yet.

waynegrease · 08:00 PM

today I went in shop and ready for take a drive test on 911. Somehow, I tried to getting the engine run but keep cranking over and over again. In my mind (plunger could be stuck again? better not) I checked up the plunger and yep its stuck again..... So I pulled FD out and soaked them with L.T. today and went crazy busying w/ other cars today. I havent a chance to get back at it. What do you guys think? its seem have to do with tolerance issue between the plunger and its bore? Maybe not worth to staying with the same FD and those problem will come back over and over time. I think we better go with new one as well as peace mind.

1982911SCTarga · 11-18-2008, 06:59 AM

Post some pics of what your plunger and the fuel distributor center section (from below) looks like.

Brian

waynegrease · 11-19-2008, 08:25 PM

I didnt takea picture of FD, I already sent them off for core exchange with another rebuilt FD from Delorean parts- www.specialauto.com

my plan is clean whole the fuel system-take accumulator out for clean w/ some additives, same thing go with fuel tank. Just want to clean them up before hooking up with rebuilt FD that way plunger wouldn't get stuck anymore. Replace fuel filter as well. Is there something Im missing or any suggesting you guys come up with that?

Paulporsche · 11-20-2008, 06:37 AM

Thought you had it there, Waynegrease.

When you finally got the plunger out was it smooth, w/o any deposits on it?

Also, did you examine the cavity it was in for deposits?

john walker's workshop · 11-20-2008, 08:30 AM

probably more particle matter coming down the line. might want to pull the fuel sender and have a look inside the tank. the old FD may have been full of dirt/rust particles.

waynegrease · 11-20-2008, 09:35 PM

Well, yes I had it there before and plunger got stuck again. Note: there has a bit of scuffle of plunger surface Im sure it is sensitive of zero tolernace between of plunger and bore. Once when there has a single scuffle on the plunger thenthat ll be more the chance to get plunger stuck in any times.

I didnt take a good observe at FD to see any deposit or corrosion, only looked at plunger and inner bore of FD looks good except scuffle!

I think about pour some of chem-dip into the gas tank (ofc I ll pull tank out for do the job).

Air blow thru the fuel hose to wipes all of particles out. I think that would be works?

Paulporsche · 11-21-2008, 05:32 AM

My earlier comment about crocus cloth came from a Bosch factory CIS book I have. It says to get the surfaces of the bore and plunger smooth.

Obviously the "trick" is to get both surfaces absolutely smooth w/o altering the tolerance.

Are you able to do this?

911quest · 11-21-2008, 05:46 AM

Not trying to come across as a safety monitor.....but your scaring me with that drop light and gas. I know a couple guys that have gotten burned real bad and lost a garage do to that type of drop light get a sealed one. So if it falls and the bulb breaks it can't start a fire.

Congrats on getting the car running

Wyvern · Wyvern's Garage

A tip and a question...

"Sea Foam" is GREAT for cleaning carbs / CIS parts
It does work like magic ...(it is even used in some pro system / injector cleaning machines.)

When the plunger is "free" how quickly does it drop?
When not running and no key on ...If I push the air plate up I can feel the plunger resistance as well. but I have to wait a 60 seconds or so till it drops back down ..if I push the plate up before that all I move is the plate ...I feel no plunger movement.

I am running rich and thinking the plunger is slow

My own advice to myself is to take it apart (or gain access to the plunger and use my secret sauce (sea foam)