boost gauge and understanding vacuum reading

ciper · Post by **ciper** » Sat Dec 15, 2007 2:16 am

Take the elbow off and let it warm up in your house?

dirtyhandssubaru555 · Post by **dirtyhandssubaru555** » Sun Dec 16, 2007 3:36 am

yeah i could do that, but i have other things i want to do while i have that elbow off so im going to wait. its been running the same since the day i bought it, so i can wait another week.

Post by **Legacy777** » Mon Dec 17, 2007 7:16 pm

dirtyhandssubaru555 wrote:when ever i start my car and step on the gas it sticks to 2k or so and comes down to 750 or so but it takes its sweat ass time. around 750-800 is see 14-13.5inhg

Yeah, if you're seeing that little of vacuum at idle 750-800 rpm, then you either have a leak somewhere, or other engine problems.

dirtyhandssubaru555 · Post by **dirtyhandssubaru555** » Tue Dec 18, 2007 1:52 am

like a bad valve, or a dieing cylinder. would bad air/fuel mixture cause low vacuum?

Post by **Legacy777** » Tue Dec 18, 2007 8:27 pm

bad air/fuel mixture could cause poor idle, which might cause a low vacuum, but that's pretty substantial to be just a/f mix.

Have you tried the starting fluid around the engine while it's running to look for a vacuum leak?

dirtyhandssubaru555 · Post by **dirtyhandssubaru555** » Wed Dec 19, 2007 1:34 am

i think i used starting fluid but not sure. i did spray something around the intake runners, tb, and all along the intake system and i didn't hear any changes in the engine. i do have a very rough idle

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boost gauge and understanding vacuum reading