Sudden CIS Problem. WUR ??
 

I have a 914-6 with a 2.7 CIS engine. Car always ran like a top. One day after it sat for a month or so, I started it, and it wouldn't idle worth a damn. It smelled very rich and was smoking a bit out of the pipe, fuel smoke not oil smoke. Occasionally I will start the car and it will run very rough and then clear up after it warms up a bit. Then it runs like a champion. Following week I can start it and it wont run worth a damn again even after it warms up. All the while it smells very rich. The running condition feels much like a car that is out of timing, popping and stumbling. WUR ???? Any advice would be appreciated.

Might be some bad gas?

Could be a gumming up of the fuel plunger.

Try a couple of bottles of Techron when the tank gets down to 1/8th and drive it as long as you can stand it. Then fill it up with premium. If that doesn't clear it up, pressure test the cold start fuel circuit.

You can check the WUR with a pressure guage. There are a ton of threads on how to check the WUR and how to modify it. You can waste a ton of money and time by throwing parts at it though.

Another thing to check is the vacuum advance on your distributor to see if it moves when a vacuum is applied. I'm not sure if a 2.7 is the same as my 3.0 though.

Also check for exhaust restriction from maybe a disintegrating muffler?

Just some ideas.

Toss some Seafoam or Techron injector cleaner in the gas...then drive it like ya stole it....

ditto. sometimes driving the hell out of these cars solves basic problems.. ;)

also, still running points? checked the gap? is the tach 'jumpy' like you see with dirty or closing points? shouldn't go out of time from just sitting a month...

Thank you all for your help......I like the drive the hell out of it advice best!!!