Common Vacume leaks

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Nov 24, 2009 | 08:24 PM

BURNSTOUGHFORD

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From: Iowa

Common Vacume leaks

Are there any common places to check for vacume leaks? It idle rough, kind of like its missing some. Tried spraying brake clean/carb clean to detect vacume leaks but neather of the cleaners i had would make the engine rev up. Guess i need to find something that will make the engine respond.

Just looking for ideas.

Nov 24, 2009 | 08:29 PM

brett12396f150

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If it idles rough.....have you done a tune up?

Nov 24, 2009 | 08:54 PM

BURNSTOUGHFORD

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From: Iowa

New plugs, checked ohms on plug wires. Checked air filter. Everything is looking good. Truck runs pretty well. Just shakes at idle.

Nov 24, 2009 | 09:34 PM

vancouver island

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My truck did the same thing. Do you have the original plastic lines? I just replaced all the plastice lines with rubber hose and the truck idles 100% better.

Nov 24, 2009 | 10:24 PM

BURNSTOUGHFORD

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From: Iowa

which vacume lines are you refering to?

Nov 25, 2009 | 08:36 AM

rla2005

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From: Kentucky

All of the plastic vacuum lines that run around the engine compartment. Spraying with carb cleaner is not really going to tell you much, IMHO.

I used a hand held vacuum pump/gauge to test each vacuum line/circuit/component on my '92 F350. I disconnected each one, tried pulling a vacuum, when it failed I replaced lines/components until it did hold a vacuum, then moved to the next.