Compression Tester
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AudiWorld Member
Joined: Mar 2007
Posts: 541
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From: Charlotte, NC
Compression Tester
I'd like your opinions about what compression tester to buy. Is the $250 Snap-On necessary or are there quality ones available at a more reasonable price? I want to test my compression and establish a baseline, if one can do that at 100,000 miles! Also, what features are important. 12v AAH, '95 Cab.
Thanks. Oh, I searched the forum, no really good answer. Also, do you need to disconnect fuel? Will fuel act as a sealant for the rings and bring up the pressure? Back in the stone age (prior to fuel injection) we would shoot some oil in the cylinder after a low reading to see if that brought the reading up. If so, it was rings.
Thanks. Oh, I searched the forum, no really good answer. Also, do you need to disconnect fuel? Will fuel act as a sealant for the rings and bring up the pressure? Back in the stone age (prior to fuel injection) we would shoot some oil in the cylinder after a low reading to see if that brought the reading up. If so, it was rings.
AudiWorld Senior Member
Joined: Apr 2007
Posts: 1,532
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From: Canada
Re: No fueling around during compression test...
It would be simple and safe to, while doing this test, to remove all the spark plugs, dis-able the ignition (un-plug the POS?), disconnect all the injectors electrically, and remove the fuel-pump relay. In this fashion you would have no possible fuel and no possible sparks, which should give you some assurance as you have "locked out" a possible fire prior to starting work. This allows you to work safe, always more relaxing.
Thread Starter
AudiWorld Member
Joined: Mar 2007
Posts: 541
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From: Charlotte, NC
Thanks guys. I was looking for a direction on a brand and if digital is better than round dial. Also, some sites recommend a remote starter switch to avoid engaging the ignition switch and (suppossedly) avoid initiating the start sequence for fuel, ignition, and electronics, thus eliminating the need for some of the steps Lago mentions. Is that possible? The idea being, just crank the starter.
AudiWorld Super User
Joined: Oct 2008
Posts: 2,749
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From: Reno, NV
i have mechanical one. i would get a digital one if you were doing a compression tests for a living. Mac-tool, matco, snap-on, ether one of those would do you just fine. i would do what Lago has mentioned, your reading too much in to this. I'ts easier to pull a relay and disconnect the POS then crawl underneath our cars, find the connectors on our starters and do it that way. but its up to you, i stick with the KISS rule.
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