finally got around to start tuning the d-jet, it's acutally run not bad, not too rich, not too lean, good power good response, but the idle hunts a bit,, I know it means that I have a vacuum leak a small one, most of not all the hoses are new only the runner rubber are old but in a good condition, what is the best way to find where is the leak, I have heard of propane??? starter fluid???? pressurising the intake and using a soap solution,,

carb cleaner

Have you checked out Brad Anders D-Jet website? Very informative, here's a link to your specific question, and if you haven't already, I'd bookmark the site:

http://members.rennlist.com/pbanders/idle.htm

Oh....I always used starting fluid with good results!

As mattilac said, carb cleaner is very popular on 914s, I would just add that if you repainted any part on the injection, the carb cleaner will eat through the paint. Other possibilities are a vacuum pump like a Mityvac, I think you'll probably end up with a combination of all the possible methods in order to sort things up. Best of luck!

QUOTE (freezing14 @ Mar 30 2005, 01:38 PM)

the idle hunts a bit pressurising the intake and using a soap solution,,

D-Jet cars - especially the 2,0's - will hunt a little. there's no idle stabiliser stuff in these cars like there is with the newer cars with digital engine management systems - or even CIS...

carb cleaner is good.

DO NOT pressurise the intake. MPS diaphragms are fragile enough just dealing with vacuum. there HAVE been cases where the diaphragm has been badly damaged by turning the engine backward at speed. (and how do you do that? you have to work at it, but a first-gear 180 can have the engine spinning backward before you can get the clutch in...)

Spray ether around the various areas you expect the leak might be, just be sure to let it clear from time to time and keep an extinguisher nearby. (I have never needed it, but I think that is because I have it on-hand!!!)