mbonner

My 83 944 suddenly became hard to start, idles rough, runs better at higher revs, seems like vacuum leak. I did find a rubber elbow on a thin vacuum line with a cut in it, I replaced that, no improvement. Just how does on find a vacuum leak? Any help appreciated,
Mike

1987na

The only way I know is on A/C systems some places use fluorescent dye and then shine a UV lamp over the a/c hoses to see where the dye comes out. Unfortunately I don't know of anything like this for regular engine hoses.

sck25jr

1st option, use a tube/hose or cardboard from a roll of papertowels and put it to your ear to listen around for a leak or
2nd option, spray wd40 or carb cleaner (least messy the better) on vaccum lines while engine is at idle, rpm's will change when you hit the leak. careful around the sparks though

Campeck

hava a propane tank? let it out around the engine and same thing as above but less messy.

75ohm

Either way, don't do it in a garage or around open flames, or let any accelerant or gas on the exhaust manifold. Think safety first.

iamgod

problem is how they run under the intake mani...i got the same issue and its almost to the point of buying the vac hoses and replacing them all