Vaccum Reading

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Nov 11, 2009 | 09:31 AM

Recoil

Thread Starter

Tuned

Joined: Mar 2009

Posts: 343

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From: Kalispell, MT

Vaccum Reading

I did a vacuum test on my truck last night, and I think it was pretty good. However the needle doesn't really hold steady at idle, it flickers a little bit, is this normal? You can see it towards the end of the video.

<embed width="600" height="361" type="application/x-shockwave-flash" allowFullscreen="true" allowNetworking="all" wmode="transparent" src="http://static.photobucket.com/player.swf?file=http://vid245.photobucket.com/albums/gg63/wkpeterman/Truck/vacuum.flv">

Nov 11, 2009 | 09:02 PM

fmc400

MSEE

Joined: Apr 2004

Posts: 10,386

Likes: 35

From: Austin, TX

It looked pretty steady to me; I'd think a variation that small would have more to do with the needle than the actual vacuum reading. Maybe someone else has a different opinion.

Nov 11, 2009 | 10:09 PM

berry1234

Logistics Pro

Joined: Mar 2001

Posts: 4,157

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Looks great to me. The needle will vibrate a bit with cheaper gauges. I have that one and it does the exact same thing.

Nov 12, 2009 | 01:04 AM

Tees77f150

Posting Guru

Joined: Nov 2008

Posts: 1,647

Likes: 3

From: Halifx Pa

Looks like mine to, and I agree don't look to bad to me. I assume your running good?

Nov 12, 2009 | 08:58 AM

Recoil

Thread Starter

Tuned

Joined: Mar 2009

Posts: 343

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From: Kalispell, MT

Thanks guys. Yeah, it is a cheap gauge, it was $10 at Harbor Freight.

It runs really well, but sometimes has an uneven idle. I think it was my air fuel mixture. I had to richen it up a bit when I put the gauge on, haven't driven it since though.

Nov 12, 2009 | 05:26 PM

Tees77f150

Posting Guru

Joined: Nov 2008

Posts: 1,647

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From: Halifx Pa

Yup! Thats where I got mine too! Harbor Freight can be your friend for sure!!

I just used mine and now from a cold start, I just hit the gas one time, and it fires right off.

I still shake my head in disbelief as this truck after setting in a barn for 20 to 22 years was a siezed up fight ALL the way for the most part.

Nov 12, 2009 | 08:46 PM

yankeerebel

Senior User

Joined: Nov 2008

Posts: 212

Likes: 1

Recoil, I did the same thing to my truck after battling for some time to find out why it didn't run well. Even with the vacuum/mixture dialed in, my truck will sometimes still have a funny lope occasionally at idle. With a stock truck that old it could be just cam wear or carbon buildup on a valve or just an old ignition module. Just run it wIDe Open!