airbox issue
 

Hi there,
I'm new to the forum and have an issue i hope someone has an answer for me on my 1983 911sc.
yesterday i went to check my timing and saw it was at tdc " i recently replaced intake boots and injector o-rings" so anyway i adjusted it to about 4 btdc and car seemed to run fine, so went for a short cruise. on the highway all was good till i got off the highway into the city. Then things started going wrong , backfiring with no low end power. I managed to baby it home and let it sit overnight.
Today i went out to check things out. I tried to start the car and all it would do is back fire. so i rechecked the timing. since i could not get it started i static timed it to tdc and it started right up but had high idle.
I pulled off the air cleaner and noticed fuel dripping off the arm of the air/fuel sensor plate and the car smells rich.Did i blow the coffin gasket or what? any help would be greatly appreciated.

The coffin seal has no fuel present, it’s just an air seal. Any fuel would come off the fuel distributor or it’s fuel connections.
As far as the running, i would be looking at the vacuum lines on the pod. The outer connector is advance with no vacuum at idle. The inner is the vacuum at idle which should pull the retard from the 5 degrees btdc to atdc
Bruce

check to see if your distributor is free and there is little to no play in the shaft.

Lorne M.

Fuel leak.........
 

You have a fuel leak coming from the fuel distributor. Look very closely on top and around the sides of the fuel distributor body for any sign of fuel seepage. If the air flow sensor arm is getting wet, the leak is coming from the defective FD plunger seal. Time to rebuild your distributor. Do not run the engine until this problem is fixed. You don’t want the gasoline drip down to the hot engine and cause FIRE.

Tony

bigedsm3, boyt911sc can rebuild yours.

He is a trusted source here. Just saying. Worth a PM.

This is also a symptom of your Lambda (O2 system) circuit losing power. A fuse, the relay on your Lambda box crapping out. Secondary to leak and just for discussion.

A fuel leak in the core of your fuel distributor is not something that is regularly talked about. Fix that first.