Won’t start, cylinders flooding

[mark houghton]

Originally Posted by FirstDotLast

Waiting on fuel head to come back and will update when I get it.
.....have seen this forum go from very active to just a handful of really knowledgeable people left who still love working on these.

I hear you. I've been messing with these since around '08, not a lot of the past active old timers left. The younger crowd just doesn't have the patience or desire I guess. Some of us are forced to learn and DIY due to geographic limitations. Nobody within 120 miles of me that would even have a clue, and that includes Porsche dealers. Air cooled is a foreign concept.

So where did you send your fuel head off to?

[gorskined]

looks like you are on the right track .
Sounds to me like your hard injector lines have crud in them holding open your injectors. i ruined a set of new injectors because i didn't realize that at first .
I went through the same thing with my 76 started just like you Two years ago . flooding out , I took the fd apart but could never get even flow across all 6 cylinders. ( the 76 FD is not adjustable its calibrated with shims under the springs) i eventually sent it out to get rebuilt ( twice got curded up the first time quickly) . ..
it was a long frustrating two winters. i eventually conceded and ended up replacing everything fuel related. tank, tunnel lines, all the fuel lines , filters, fuel accumulator, fuel pumps, injector lines,2 sets of injectors. new csv, had the wur rebuilt made it 3 ways adjustable. rebuilt fuel distributor.
i brazed an6 connectors to my hard lines to and from my fd. made it much cheaper and easier to replace all the lines . It also gave me the option of installing fuel gauges and check valves where ever i wanted Took the guess work out of dialing the car in. a wide band afr gauge is a must.

PS i did notice a mention of distributor wires is the 86 distributor ccw rotation like the 76? i made the mistake of wiring mine like the regular 911, it ran but ran awful.

this forum has a great group of core members lots of shared knowledge. i knew nothing about the turbo cars until a few years ago
Good luck keep us informed of your progress
Regards Ned

[FirstDotLast]

Ok sorry for the late update here.

I sent the FD to Brian at rarlyl8 to be rebuilt and had a quick turnaround from him. I also bought a new set of injectors I put everything together but put the injectors in baby bottles, and ran the pumps to verify the flow. As you can see below all six injectors gave the same flow. After that, I was all messed up on the mixture screw so for posterity, here’s what I did:
I leaned it out until there was a decent amount of travel before it activated the plunger in the FD, then ran the pumps and turned the mixture clockwise (enriched) until a light spray of fuel started spraying out of the injectors, they were still in baby bottles at this point.

Then I turned the pumps off, put everything back together and she started up on the first try. It was rich but then I backed off the mixture screw until I got it dialed in and was able to get my idle AFR to 13.5. The idle is a tiny bit high at about 1k rpm but that’s more due to the throttle body being misadjusted. When I originally dropped the motor, the throttle body rod was cracked at the transmission end so I replaced it. It might be adjusted just a bit too short so it’s holding the butterfly open.

In any case, she runs again!

[Alan L]

Perfect result and absolutely the correct way to re set the idle mix. Screw it in til injectors just open, then back off 1/4 - 1/2 turn, and adjust from there.
Good work. So either you had injectors with low opening pressure or a suspect FD. Either way you are good to go now.
You will be able to check the butterfly setting by removing the IC and recirc body.
Alan

[mark houghton]

Originally Posted by FirstDotLast

In any case, she runs again!

That there is GOOD NEWS! Now we can all sleep at night.

[FirstDotLast]

Originally Posted by mark houghton

That there is GOOD NEWS! Now we can all sleep at night.

Haha a lot of lost sleep over the past couple weeks because of this!

[FirstDotLast]

Some obligatory garage pics now that it drives again. Still getting it dialed in just right, haven’t had time to adjust the throttle plate yet. The track car is my 981 GT4 with a full 4.5L build

[mark houghton]

Nice! But you people with red Porsches...I don't know about y'all. IMO, a 930 needs to be black as in what your widow would be wearing, or secondarily white such as mine :-)
But the GT4 is good in red. Nice collection for sure.

[Alan L]

Very cool. bet the GT4 is a blast.
Alan

[gorskined]

if it starts running like garbage in a few 100 miles buy a cheap ultrasonic jewelry cleaner fill it with a thin degreaser and put your injectors in it with the inlet side on a slight down hill and run it a bunch of time . my injectors clogged up quickly picking up debris from inside my hard injector lines ( looked like black pepper flakes). i eventually had to replace my hard lines .. also another thing to check is your main strainer entering your fuel distributor this should catch anything post filter pre fd . fingers crossed this is the end of your gremlins .