Test Budha Logo
Menu
Disclosure
This website is a participant in the Amazon Services LLC Associates Program. We are reader-supported. If you buy something through links on our site, we may earn an affiliate commission at no additional cost to you. This doesn't affect which products are included in our content. It helps us pay to keep this site free to use while providing you with expertly-researched unbiased recommendations.

The Best Autozone Compression Tester of 2021

  Updated on 19 October, 2021

Handpicked
Quality-Checked
Generated From 25K+ Reviews!
Bestseller No. 1
AZUNO Compression Tester Automotive(Update), Digital...
  • Deluxe Design Set: Complete package for compression testing on gasoline engines, comes...
  • Accurate Measurement: Digital compression gauge has incredible 0.5 display resolution...
  • Smart Display and Bleeder Valve: Wide backlit LCD screen displays large, clear numbers in...
  • Professional and Durable: Built for all-day performance in the shop or garage from the...
Bestseller No. 2
9pcs Automotive Compression Tester Kit and Spark Plug...
  • 【Complete Kit for Car Testing】: the 9pcs cylinder testing kit comes with 8 x...
  • 【Extra Value with Spark Plug Tester】: the spark tester is a must have diagnostic tool...
  • 【300psi Dual Units Gauge with 3” Dial】: easy to read this compression gauge which...
  • 【Easy and Safe to Use】: first, remove the fuel pump and fuel-injection fuses,...
Bestseller No. 3
BETOOLL HW0130 8pcs Petrol Engine Cylinder Compression...
  • Checking Compression On Petrol Engine Quickly And Accurately
  • Easy Pressure Release Button On Side Of Tester
  • Completed Kit Comes With Adapters For Most Applications
  • Kits Includes 2 Rubber Cones Ends Which Do Not Need To Thread Into Head
SaleBestseller No. 4
FOXWELL NT301 OBD2 Scanner Professional Mechanic OBDII...
  • 【Vehicle CEL Doctor】The NT301 obd2 scanner enables you to read DTCs, locate bad O2...
  • 【Accuracy & Streams】Live data graphing and logging. Accurately read error codes for...
  • 【Worthy to Own】Recommended by Mechanic Scotty Kilmer on Youtube. Codes analysis and...
  • 【Smog Check Helper】Read/Erase and I/M readiness hotkeys make it easy to use the car...
Bestseller No. 5
New Leak Down Tester Tu-21 Engine Cylinder Leak Tester...
  • FITS YOUR VEHICLE -- It is compatible with gasoline 4-stroke engines and 12mm or 14mm...
  • COMPARE CYLINDERS -- It best tests cylinder leak down and compression when comparing a...
  • EASY TO USE -- Remove the Schrader valve and turn the regulator off before applying shop...
  • Designed to detect a variety of common engine faults. including: Worn piston rings, worn...

How We Score

Learn More
Our app considers products features, online popularity, consumer’s reviews, brand reputation, prices, and many more factors, as well as reviews by our experts.

Click on products MORE INFO button to explore, or read more About Us
8.9
Popularity
7.9
Reviews
8.4
Reputation
9.5
Quality

Buyer's Guide: Autozone Compression Tester

The Autozone Compression Tester Shows When Your Cylinder Was Overheated

Autozone Compression Tester yesterday did the job as expected, and was really pleased with how it worked. When Autozone special compression testers first came out, well we were doing a compression testing then because this is a brand new model and all. Cylinder number 4 went okay about 185psi, Cylinder number 3 WAS okay.

But, yesterday, I noticed that the "wet floor" warning light was on when I went to do my oil change and valve changing. Was thinking about calling autozone auto parts to help but decided to try out this autozone compression tester first. Yes, it worked, even for the valves. I think next time I have to replace a valve or two, I will just use an autozone compression tester to make sure everything is ok.

About a year ago, at our local auto parts store we tried out the new autozone compression tester and it performed like a charm! We have been using it ever since and were not let down at all. The valve cover came off and the four valves came right off the cylinder head and were replaced with the new ones. My valves are not that big, but the gasket is rather large. There is nothing else to worry about.

One thing about the old Cushman "D" series of pistons, they tended to come loose and lock up over time, especially in very cold weather. A low compression cylinder head always caused issues with my engine in cold weather. That's why we always switched to the "E" series pistons. This "E" series has a "low compression" setting, as opposed to the high compression settings on the D series. So it seems to work better for us now.

With the new spark plugs, there should be no problem with the pressure passing through the cylinder at any given time. That's what I was having trouble with the D series spark plugs. However, with the Autozone Compression Tester, we will know if the pressure is too low before it gets to the piston. This is much easier than trying to diagnose a low compression problem by looking at the dipstick.

Another thing that I notice is that the Autozone compression tester is a little more robust than the regular Autozone. The other day, I took it out for a test drive and really didn't notice any degradation in power or efficiency. That just goes to show how well built these things are. The other thing I noticed, was that the replacement nozzle doesn't quite fit snuggly into the hose, but it still seems to be able to pull the charge out with minimal resistance.

Based on what I've read about the PMI (parts monitor indicator) chips inside of your engine, you can expect them to give off a false positive about something when the engine is cold. That's not necessarily good news. The PMI chips don't have a constant pressure value like the Autozone compression tester does. They also have an idle speed that is independent from the RPMs of your engine. They monitor the amount of fuel flowing though the system, and based on the readings, determine whether or not to run the engine or not.

So, since the Autozone compression tester doesn't have any built in pressure gauge, what do you do? You want to make sure that your OEM cylinder head is turned at its highest setting while your engine is running. This will get the most accurate reading that you can get. It's just a simple rule of thumb, although I'm sure there are more precise things that can be done with it.