Help cylinder Not working
 

Hello friends have a 86 911 carrera Cylinder
4 &5 spark plugs are turning black. Replace the rotor, cap, spark plugs twice Had all the fuel injectors cleaned by a shop. When you start the car it sounds Like When you remove a spark Wire. Shaking When is running
Car was running fine When I parked in the garage I removed the fuel tank cleaned it out and that's when it started happening. Please help what should I do Hope I explain it well
P.s car was sitting for 8 mouths Before I cleaned the gas tank out

Double check all your vacuum lines, especially the ones on the fuel regulator

Not sure what the order is that you did everything, but how long until you had injectors cleaned and then installed. 4 & 5 are black so running rich. I would move injectors 4 & 5 to other side and see if it follows. They could be stuck open. Are all wires fully connected. Did you touch the valves? Did you replace the filter?

Also the vacuum lines going to the regulator and damper make sure no fuel is in them. That was my issue and it was dumping fuel.

Yes all vacuum lines are connected and securedid not see any fuel on the lines but Going to double checking again The regulator
Thank you

Injectors were clean and put back on the vehicle of the same day. The shop told me they were Working good. All wires are fully connected. The valves were never touched or engine open. Fuel filter was replaced Thank you

Going to double check today thank you.

Check the spark plug wires. Probably they're gone bad over the time. The spark can jump over a break, but with every break it's going weaker up to a complete fail.

Thomas

Yes sir I replaced the wires as well thank you

Today I'm receiving a kit of NOID to check out if the injectors are getting Power don't think that's the problem but I'm trying everything.

If the plugs are going black it’s probably an ignition issue not fuel starvation.

I'd like to thank you all for your comments I finally got the car running and it's perfect issue was 2 of the injectors was running at 40% Even though I had them clean I read somewhere Injectors can Have an issue again after cleaning so I took them Back again to the shop and they Clean them again And that was the issue Thank you guys