Clogged CIS FI Line

[Chris Ryan]

Dear Forum:

We have 1 911S

[boyt911sc]

Chris,

Did you pressure test the lines? What made you conclude that the FI line is clogged? Just replaced old FI lines this past week. If you need some help, please contact me at ATD911@hotmail.com and I'll lay out a simple procedure to remove the clogged material/dirt in the line. Thanks.

TD

[Chris Ryan]

Thanks for the reply; Actually, I hit send before the entire message got typed. Here are more details:

Car is the 1977 911S; Within the past year, it has had new injectors, WUR, various vac lines replaced. Normally starts a little rough when warm, but smooths out after a minute or so and runs great. Lately (this has happened twice in the past month or so) I discovered thet the #1 cylinder is not firing due to no fuel. (Removed injector, left it connected, started engine, put it in a coke bottle, and observed no flow. Then, I disconnected the from the injector and at the other end on the fuel distributor, blew out injector and line with compressed air, squirted some gumout into the distributor connection for that FI, put it all back together and it runs fine. It seems that when I loosen the fitting on the distributor fir #1, no fuel comes out at first - like it is airbound or something, but after reassembling, it works fine. Do I need to take the whole distributor out and clean it ? or (hopefully not) does this indicate the need for a new fuel distributor ?

Thanks for any insight....

[Sunroof]

Chris.
Let the fuel get to 1/4 tank low then add a full bottle of Chevron Techron (bigger the bottle 20 ounce, the better). Fill the tank to 1/2 full with Chevron 93. Drive it, just drive it....no need to run a 100 mph! Techron will not combust, but will clean the injectors and cylinder walls and weep down to the oil pan. You can smell it on your dip stick.

When your at 1/4 empty do the process again. If this does not help to clean injectors and freshen the system......then I will be a monkey's uncle!!!!!!!!!!!!Stuff works... you might consider changing the oil within 500 miles.

Bob