How to do a compression test: Jeep Wrangler

[@hemipowersrt6773]

Love your videos! I’ve learned a lot from them and say the a lot of money doing it myself . Thank you!

[@JeepSolid]

Thats great. Glad they've helped you out! Thanks for watching.

[@rubenyoung8372]

Real great video. I appreciate the quality of your work even through the internet! My question is does the accelerator need to be depressed while cranking the engine?

[@markstroeh6997]

I appreciate your videos from the great state of Texas. You rock!

[@JeepSolid]

+M S Thanks! I get a lot of activity from the great state of Texas!! I appreciate it

[@fishsticksmlg]

Cant wait for the wet compression test, my average is 108~ish. I found a little white slime on my oil cap so really wanting to make sure that the head gasket isn't leaking.

[@JeepSolid]

Thanks! Wet compression test video will be out soon. Thanks for watching!

[@BroncoSolid]

Really liked the intro. That guy is good.

[@JeepSolid]

Yeah, kinda goofy looking, but Good!

[@TrailRecon]

Great video and excellent information as always!

[@JeepSolid]

+TrailRecon Thanks Brad!

[@robertograham6065]

I realize it is quite off topic but do anybody know a good site to watch new series online?

[@juliusdanny9725]

@Roberto Graham I would suggest flixzone. Just google for it :)

[@3hdninja]

Good Video. Like the white board illustration work.

[@JeepSolid]

Thanks. Was kinda fun making it.

[@judahharmon460]

He used the same music that demo ranch uses in his vlog

[@chrisanddeinnasadventures7857]

Wow that red heads hot!!

[@eddiegonz1630]

Your video is awesome, thanks.

[@sketchman1981]

Cant help but think of Off the Ranch with that music

[@jsk326]

4:22 to 5:15, Don't you want fuel in the system for an accurate reading seeing as the Air-Fuel mixture will affect the compression ratio? Isn't the potential flash point is eliminated by removing of wire to the coil (asking for a friend). I was taught to have the throttle wide open during test also. Maybe I was misinformed?

[@JeepSolid]

Yeah, the throttle should be wide open. Don’t want fuel in the cylinder though. Doesn’t affect the compression test.

[@monirobaid5809]

hello sir, can you tell me what is the highest compression reading that considered a good reading on a 2003 Mercedes benz e500 ?

[@karka24]

Great video keep them coming

[@JeepSolid]

+karka24 Thanks! Appreciate the support.

[@skiutah48]

Thank you for the video!

[@midwestfreakshow726]

But the throttle cable is attached to the intake that you removed

[@randyanderson6110]

Did my compression. On the last cylinder, after putting in oil, I realized that I forgot to open the throttle for my testing. So before I disconnected the compression tester I cranked engine with throttle open and got an extra 4 lbs on that last cylinder. Im guessing had I opened the throttle on all cylinders, before and after oil, the compression would have been an average of 4 lbs per cylinder higher.

[@JeepSolid]

Yeah. I'd assume theye'd be just a few points higher. Probably not worth retesting them all unless you're on the fence about a cylinders condition.

[@Giovani25x]

In order to do the compression test do I really have to remove the exhaust manifold and all that ?? But I put a Jasper engine in there 3 years ago I'm sure the compression is fine .Runs like NASCAR .( I'm not trying to brag ) I would like to see what the compression is actually

[@JeepSolid]

+Giovani22 no. Definitely don't remove intake and all that. I mention that stuff is part of another video. Thanks for watching!

[@garygary9288]

I basically have the same tester that includes 10mm 12mm 14mm 18mm the 14mm seems to be a tad small and will not thread. I'm wondering what size fit your spark plug hole

[@DarthB213]

Same, did you ever find a good tester for it ?

[@garygary9288]

I think the problem was the depth. I had to use a non fouler for a spark plug as a extension. Screwed that in first then the tester fit that.

[@jalatecompa]

bad lifter could make a. ompression loss?

[@mushfaker]

If a valve is stuck open the air in the combustion chamber will leak out through it when compressed. If a lifter is somehow causing a valve not to close all the way then the answer is yes.

[@Bloodr3ad]

Can you simply remove the fuel pump relay?

[@mushfaker]

Yes. That was the relay that he removed in the video. He just misspoke I think and called it a fuse.

[@NashvilleEarlyBronco]

Nice!

[@JeepSolid]

+Nashville Early Bronco Thanks man!

[@sushil1983]

today i made the same test in my 95 YJ with all giving 150 -148 is that good?

[@JeepSolid]

+sushil1983 that's perfect. High normal on the 6 cyl is 150psi.

[@randyanderson8557]

How did you make the animation video?

[@JeepSolid]

With pictures. One photo at a time :) Took a while, but I wanted to experiment with it. Turned out ok.

[@randyanderson8557]

someone said to put a squirt of oil into cylinders before the test, whats your opinion on that?

[@JeepSolid]

Yeah, that's the wet compression test. I'd do it both ways. I also have a video on the wet compression test. Check it out... I used a bit more oil in the video than needed. Only takes a squirt or 2.

[@patringler]

kill the loud music