380SL vacuum leak TROUBLESHOOTING... - PeachParts Mercedes-Benz Forum

84 500SL Euro · #1 10-04-2008, 07:53 PM

Just got a new hand vac pump&gauge and want to troubleshoot an oscillating idle and would appreciate guidance from anyone successfully having dealt with this.

If there's a website or post that deals with this car's problem, please
let me know. I found one but it's for diesels and, being a novice, I need the particulars for this car.

If this is unavailable, a written narrative of the rudiments (assuming as little as possble)... would be a blessing for the entire group I assume.

If someone could outline the fundamentals and others join in to accumulate a sort of vacuum-wiki, a lot of posting redundancy could be avoided and efficiency enhanced, it seems to me.

If I've missed what I seek, pardon my dust and set me aright :-)

Thanks so much to all involved in this group,

Courtney

84 500SL Euro · #2 10-06-2008, 02:03 PM

Having roamed around past group postings, I found a number of not direct but helpful suggestions.

However over a couple of days, I scrutinized the vac lines and found several under the hood that were seemingly loose, which I tie-wrapped securely. And finally found a couple that were seemingly disconnected which I connected.

Idle is better but still fluctuates a little when cold, though settles when warm, though is too high,... around 900 rpms.

Is 7/64" [ID] the proper size for the black vac lines ?

What are the much smaller [OD] translucent lines made of and who makes them ? These are the ones that are in direct contact with a hot engine, run all over the engine and presumably can withstand intense heat and plug in to various connectors, elbows, etc..

Courtney

hey_allen · #3 11-21-2008, 01:14 AM

These small lines are some unknown (to me) plastic, but are very cheaply available from the dealer or from just about any MB parts house.
I got a couple of meters of the stuff from Fastlane a while back, for less than $10 if I remember correctly.