More rough idle stuff.

Rough idle driving me nuts.
Got some starter fluid, sprayed it near the manifold intakes. The idle definitely picked up. All of the intakes seemed to cause it to pick up when I saturated the area around them(I mean no matter which one I sprayed separately, it picked up). It picked up, and while it was up and idling nicely as the fluid got sucked into head and burned, it gave off a big ol Empty POP periodically.

When it's allowed to just run rough, it doesn't give the big empty pop. It's not a backfire, it's a pure miss with no gas, or no spark (but I don't know which). When it's rough, there is no big empty pop. Just a super rough, crappy sounding idle. (sounds like an old beefed up Chevy engine or something.)
The thing is, I know 4,5,6 are so sealed it's not even funny. I just redid them. However, it seems like the black plastic seal wobbled a bit on each one. But I figured when I torqued it, it would flatten out. I even put sealant around the gaskets and torqued them down carefully the second time.

Does the engine warp or something so no matter what you do, you can't get it to seal right? This is a huge mystery.




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Kurt B
1984 911 Carrera Cabriolet
75 914 1.8

I have my doubts about warpage of the aluminum and steel, but how about stiff, aged, 16-year old rubber connections? Did you try spraying any fluid around the various rubber, or black plastic connections?

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Warren Hall
1973 911S Targa

Kurt,

Hey bud be careful with that starter fluid. It is mostly ether which is very volatile, highly flammable liguid. One spark, hot spot etc. and you could be in a world of hurt. My dad use to check intakes with a very fine mist of water. If the manifold is leaking the water will really make it run rough and you will live to fix it.

Yeah. I did. I'm going to look up how to richen up the mixture (if richen = more gas).
There's some kind of trick to it with the motronics..have to make a short, then adjust etc. Kinda complicated as I remember.
Thanks for the idea on using a water mist. Definitely not a bad idea over starter fluid!

I guess I'll take it back to the same wrench and have a leak down test etc.
I'm not driving a Porsche, it sounds like I'm driving a 66 Chevy!