1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

how do you do a compression test?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by undermoneyed, Feb 29, 2012.

  1. Feb 29, 2012 at 8:45 PM
    #1
    undermoneyed

    undermoneyed [OP] aka Alley Opp,

    Joined:
    Jan 7, 2012
    Member:
    #70169
    Messages:
    116
    Gender:
    Male
    First Name:
    Mark
    B.C., Canada
    Vehicle:
    Tacoma TRD
    totally stock
    Getting closer to buying my Taco. Can anyone tell me how to go about doing a compression test on a 2nd gen Taco. Got my eye on 2009 V6.
    Thanks,
    Mark
     
  2. Feb 29, 2012 at 9:41 PM
    #2
    Night

    Night Well-Known Member

    Joined:
    Feb 21, 2011
    Member:
    #51613
    Messages:
    981
    Gender:
    Male
    First Name:
    Mike
    Canada
    Vehicle:
    '11 TRD OR AC MagGrey
    Banks Monster Exhaust, aFe ProGuard 7, 3M Film, UnderCoating, alpine 920 headunit, alpine 6.5 components, 20% tint all around, JL Stealthbox, PDX-V9 Amp, Avid Lightbar, Avid Sliders, Full Metal JackRabbit Tonneau, TRD S/C
    My only knowledge of doing a compression test is with actual gauges while turning over the engine. The spark plugs must come out and I don't think having fuel injection can be working either. Correct me if I'm wrong.

    Compression test isn't a logical or time effective thing to do. If its low mileage on a 09 its not a problem.
     
  3. Feb 29, 2012 at 9:52 PM
    #3
    Bosmob

    Bosmob Well-Known Member

    Joined:
    Jun 9, 2011
    Member:
    #58017
    Messages:
    380
    Gender:
    Male
    First Name:
    Kevin
    San Diego, CA
    Vehicle:
    '11 Access Cab SR5 I4 4AT
    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    A compression test would not be needed for a 2009 vehicle. If you even feel the need to run one on the truck you have your eye on... WALK AWAY. There are tons of 2009 Tacoma's on the market and this particular truck must be beat to hell if you deem it necessary to run a compression test.


    But to answer your question, you would need to pull the spark plugs out, hook a compression testing gauge into one plug hole,crank the motor over and record what the PSI was. (repeat 5 more times)

    Or you can run a compression test with a Techstream. (Toyota scan-tool) It's not a "real compression test" because it just looks at how much downward force is being exerted from each piston on it's power stroke. It is easier and quicker than running a traditional compression test but not as accurate and idk where you are going to get a hold of a Techstream.
     
  4. Mar 1, 2012 at 5:54 AM
    #4
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

    Joined:
    Jun 18, 2010
    Member:
    #39131
    Messages:
    30,854
    Gender:
    Male
    First Name:
    Mike
    Massachusetts
    Vehicle:
    '13 Ford F-150 SCREW
    F-150 Mod
    Agreed, a compression test shouldn't be required on such a new vehicle unless you think there's something seriously wrong. If the engine isn't running properly, the check engine light or one of the other dummy lights would come on.
     
  5. Mar 1, 2012 at 6:04 AM
    #5
    elmo7

    elmo7 Easily Replaceable Member

    Joined:
    Aug 11, 2011
    Member:
    #61553
    Messages:
    707
    Gender:
    Male
    SC
    Vehicle:
    07 DC TRD OR 4x4
    Wouldn't the 5-second compression test be to just check for a sooty tail pipe?
     
  6. Mar 1, 2012 at 8:54 AM
    #6
    Chris(NJ)

    Chris(NJ) Well-Known Member

    Joined:
    Jan 21, 2010
    Member:
    #29777
    Messages:
    2,884
    Gender:
    Male
    First Name:
    Chris
    Usually in Central Jersey
    Vehicle:
    08 Indigo 4x4 DC OR
    Debadged, GC Mesh Grill, Yellow Fogs, Color Matched Headlights w/ Retros, Diff Breather Mod; mickey thompson classic IIs, 5100s, toytec springs, Dakar Leaf pack, ss brake lines, Lots more...just check the build page.
    I agree w/ these guys. There shouldnt be a need for a compression test on an 09 motor in this truck. If you were buying a turbo car thats been modded and beaten on, that'd be a different story imo, but I wouldnt sweat it on this if the thing drives ok. And if it doesnt...find another. tacomas are definitely not limited in availability.
     
  7. Mar 1, 2012 at 8:57 AM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,187
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    No. Soot on the exhaust is dependant on how the vehicle is driven. multiple short trips can cause the soot to accumulate.
     
  8. Mar 1, 2012 at 9:04 AM
    #8
    BlueT

    BlueT Well-Known Member

    Joined:
    Mar 30, 2009
    Member:
    #15341
    Messages:
    5,645
    Gender:
    Male
    NorthEast
    Vehicle:
    07 Dbl Cab LB with LSD
    I moded 1999 Taco so much it had turned to Land Cruiser
    ^ that and crappy fuel will cause soot.
     
  9. Mar 1, 2012 at 9:24 AM
    #9
    skytower

    skytower Well-Known Member

    Joined:
    Jun 7, 2010
    Member:
    #38505
    Messages:
    3,228
    Gender:
    Male
    First Name:
    Dave
    virginia
    Vehicle:
    08 Tacoma 4x4
    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    A detailed inspection by a quality mechanic is never a bad idea when buying a vehicle. Time and money are the limiting factors in how involved an inspection you want.
    A leakdown test would be a better test of engine health. It not only tells you that there is a problem, it tells you where it is. A compression test will only tell you there is a problem.
    If the test helps you sleep without nightmares of engine failure, do it!
     
  10. Mar 1, 2012 at 10:19 PM
    #10
    undermoneyed

    undermoneyed [OP] aka Alley Opp,

    Joined:
    Jan 7, 2012
    Member:
    #70169
    Messages:
    116
    Gender:
    Male
    First Name:
    Mark
    B.C., Canada
    Vehicle:
    Tacoma TRD
    totally stock
    Thanks for the input guys.
    The 2009 is a clean looking Tacoma Access cab (about 50,000 km or 30,000 miles), it does not look at all abused but I'll feel better checking it out as much as possible. Odds are I'm wasting my time but I will sleep better. I've got a Haynes Repair Manual for 2005 to 2009 Toyota Tacoma but it is short on info regarding a compression test.
    Is there any special way to ground the wire from the coil to the distributor cap? I don't want to risk any damage to any electrical components. One more dumb question, where is the dip stick for the auto trans located?
    Thanks in advance.
    Mark
     
  11. Mar 2, 2012 at 7:14 AM
    #11
    speedjunkie13

    speedjunkie13 Well-Known Member

    Joined:
    Jan 11, 2012
    Member:
    #70448
    Messages:
    151
    Gender:
    Male
    Vehicle:
    a work in progress
    with all due respect... take it to somebody who knows what the hell they are doing if you want the truck checked out. It sounds like you will just end up breaking something.
     
  12. Mar 2, 2012 at 7:26 PM
    #12
    undermoneyed

    undermoneyed [OP] aka Alley Opp,

    Joined:
    Jan 7, 2012
    Member:
    #70169
    Messages:
    116
    Gender:
    Male
    First Name:
    Mark
    B.C., Canada
    Vehicle:
    Tacoma TRD
    totally stock
    Thanks Christian, I appreciate the trouble you went to, very informative.

    Hey, Speedjunkie, I've rebuilt differentials, replaced timing chains, harmonic balancers, axles, spindles, bearings, etc. but not on a Tacoma. Most of these projects are not a big deal.
    I want to do the job correctly so I have to ask because it is not in the Haynes Taco Manual. Just because it is not in the Taco Manual doesn't mean the a non registered mechanic can't do it. And just because someone is a registered mechanic that doesn't mean they can't screw up.
    I like to do as much work on my own vehicle as possible then I know it is done correctly. I get to know my vehicle, save cash plus have a great sense of satisfaction having tackled something I've never done before. The really tough or difficult jobs, I leave for my mechanic at $90.00 per hour.
    Mark
     
  13. Mar 2, 2012 at 7:40 PM
    #13
    skytower

    skytower Well-Known Member

    Joined:
    Jun 7, 2010
    Member:
    #38505
    Messages:
    3,228
    Gender:
    Male
    First Name:
    Dave
    virginia
    Vehicle:
    08 Tacoma 4x4
    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    The haynes manuals are good for general info, but nothing beats the factory manuals. Check ttora.com for pdf versions before you buy one.
    Sounds to me like you have the chops to do the work yourself. I do my own work for all the same reasons. I'm lucky to have access to the military's auto hobby shops. Working from a lift makes for faster work when I need it. Can't beat an indoor bay either.
     
  14. Mar 2, 2012 at 9:03 PM
    #14
    undermoneyed

    undermoneyed [OP] aka Alley Opp,

    Joined:
    Jan 7, 2012
    Member:
    #70169
    Messages:
    116
    Gender:
    Male
    First Name:
    Mark
    B.C., Canada
    Vehicle:
    Tacoma TRD
    totally stock
    Thanks for the tip Dave, I'll check out ttora.com before buying my factory manual. I got a couple of factory manuals from helminc.com a few years back, they carry a fair variety.
    Having an indoor lift, that makes life a lot easier. Without a lift there are some jobs I will not tackle.
    Looks like I'm getting closer to getting my Taco. Got a guy coming over this weekend to buy my old pickup. After that, I have one more vehicle to sell then it's Taco Time.
    Cheers,
    Mark
     
  15. Mar 2, 2012 at 9:07 PM
    #15
    skytower

    skytower Well-Known Member

    Joined:
    Jun 7, 2010
    Member:
    #38505
    Messages:
    3,228
    Gender:
    Male
    First Name:
    Dave
    virginia
    Vehicle:
    08 Tacoma 4x4
    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Good luck. I always go into buying a used vehicle with much trepidation. You really never know what you're getting.
     
  16. Mar 2, 2012 at 9:22 PM
    #16
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,187
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    http://www.ncttora.com/fsm/
     
  17. Mar 3, 2012 at 8:52 AM
    #17
    speedjunkie13

    speedjunkie13 Well-Known Member

    Joined:
    Jan 11, 2012
    Member:
    #70448
    Messages:
    151
    Gender:
    Male
    Vehicle:
    a work in progress
    It's just that the questions you were asking are pretty basic engine knowledge on any newer car. It's awesome that you like to do your own work and want to learn as much as possible, i just don't think to time to learn that stuff is on a vehicle somebody is trying to sell.

    Sorry if i came across rude, that was not my intention. I hope everything works out and you enjoy your new truck.
     
  18. Mar 3, 2012 at 1:46 PM
    #18
    undermoneyed

    undermoneyed [OP] aka Alley Opp,

    Joined:
    Jan 7, 2012
    Member:
    #70169
    Messages:
    116
    Gender:
    Male
    First Name:
    Mark
    B.C., Canada
    Vehicle:
    Tacoma TRD
    totally stock
    Thanks for the reply SpeedJunkie. Good luck in your endeavors.
    Mark
     
  19. Mar 4, 2012 at 10:12 AM
    #19
    undermoneyed

    undermoneyed [OP] aka Alley Opp,

    Joined:
    Jan 7, 2012
    Member:
    #70169
    Messages:
    116
    Gender:
    Male
    First Name:
    Mark
    B.C., Canada
    Vehicle:
    Tacoma TRD
    totally stock
    Thanks for the website Chris.
    Mark
     
To Top