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Re: V6 Shuddering Slightly Posted by bobc [Email] ![]() ![]() ![]() In Reply to: Re: V6 Shuddering Slightly, B Millar ![]() ![]() |
Yea the vac lines are small diam rubber lines that running all over. if you pull one off while the engine is running you can usually feel and hear the suction. you will also notice a change in the engine (it will falter, rpms will change, etc)
The issue is that if a vacuum line is leaking (say the rubber is getting brittle and cracked) it is allowing un-metered air into the engine. the engine is getting more air than then computer expected (based on what the MAF told it), and so it is running lean. This causes some or all of: hunting at idle, pinging, stalling/stumbling when you first get on the throttle, etc
The pros use a smoke machine to find vacuum leaks. but you can check each vac line yourself ... wiggle the line at the connection see if its loose or brittle. and check that there are no cracks along the length as well, but most often the problem is at the connection.
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