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#1 |
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FIRE IN THE HOLE!!!!
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How to test your compression
I have been seeing alot of questions about compression and how to test, so here is a writeup i did.
Compression Test by Smaay 1. Open hood ![]() 2. Remove engine plastics with 5mm Allen Wrench. ![]() 3. Plastics removed ![]() 4. Reach behind engine to unplug power steering sensor ![]() ![]() 5. Remove the four 10mm bolts holding coils. ![]() 6. Unplug coils ![]() 7. Remove the two 10mm nuts holding wiring harness. ![]() 8. Lift wiring harness out of the way. ![]() ![]() 9. Pull all four coils. ![]() ![]() Coils removed exposing sparkplugs ![]() 9.5 unplug the 4 injectors so they dont squirt. ![]() 10. Using 5/8 spark plug socket and suitable extension (6-8 in.) remove and inspect sparkplugs. They should be a copper color like pictured. ![]() Image of compression tester purchased at Autozone/Pep Boys/Kragen/Napa/etc. ![]() 11. Screw compression tester into cylinder 1 hand tight. ![]() ![]() 12. Hold down gas and clutch at the same time, crank engine over about 6 times, until needle stops jumping on compression tester http://www.youtube.com/watch?v=CkaUtDSdmF4 13. Record results. ![]() 14. Release air pressure from tester and repeat for each cylinder. ![]() ![]() Straight from the Toyota Manual (BGB) Compression pressure: 1ZZ-FE 1,500 kPa (15.3 kgf/cm2, 218 psi) 2ZZ-GE 1,400 kPa (14.3 kgf/cm2, 203 psi) or more Minimum pressure: 1ZZ-FE 1,000 kPa (10.2 kgf/cm2, 145 psi) 2ZZ-GE 1,000 kPa (10.2 kgf/cm2, 145 psi) Difference between each cylinder: 1ZZ-FE 100 kPa (1.0 kgf/cm2, 15 psi) or less 2ZZ-GE 110 kPa (1.1 kgf/cm2, 16 psi) or less 15. After test complete, put car back together in reverse order. 16. DONE! Have a beer to celebrate good results, or sulk in sorrows. edit: this will throw a CEL for misfires. there is a fuse you can pull to prevent it but im not sure which one it is. but just unhook your negative terminal on the battery for 5 minutes and it will reset the CEL. Also the car might have a hard time starting, dont worry, just give it a few more cranks. It will start
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2001 Celica GT-S 2ZZ-GTE 1997 Celica GT 5S-FTE 1997 Supra 6sp 2JZ-GTE 1990 Celica All-Trac 3S-GTE 1998 Dodge Ram Cummins Turbo Diesel Thats alot of BOOST! Last edited by Smaay : 09-23-2007 at 09:57 AM. |
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#6 |
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Moderator
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Bro - you forgot to tell them to unplug the injectors so they don't wash their cylinder walls and wind up blowing fuel out the plug holes.
You also forgot to mention that they will have 4 igniter codes stored in the ECU after this that will need to be erased Otherwise nice writeup
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Now offering: 2ZZ Performance Intake Manifold | 2ZZ Ported Headers | 2ZZ Ported Cylinder Heads | PowerFC Harnesses for DBW and Auto 2ZZ | MR2 Spyder 2ZZ Swap Kits | Engine Builds | Turbo / Supercharger installation | Tuning Sales Inquiries: Sales@DDPerformanceResearch.com Technical Inquiries: Technical@DDPerformanceResearch.com
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#7 |
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Old Member
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You can get a compression tester at walmart also. It's usually cheaper. That's where I got mine. If they sell it at kragen's, etc. Check walmart. It will probably be 25-35% cheaper. Not just compression tester, but other automotive parts. Mobil 1 oil synthetic for 5 quarts is only $20 bucks, cheaper then costco.
And yes very important part is to unplug the fuel system. If there is an easy accessible fuse, that would be the easiest way, if not, unplug them from the harness. You should also mention you can do a wet test. If compression is low, or 0, put a capful of oil in the cylinder which is low and try again. See if it gets you a bit more compression. If not you got some bent valves, if so, prob. the rings. |
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#8 |
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FIRE IN THE HOLE!!!!
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hey i cant think of everything. Added the information
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2001 Celica GT-S 2ZZ-GTE 1997 Celica GT 5S-FTE 1997 Supra 6sp 2JZ-GTE 1990 Celica All-Trac 3S-GTE 1998 Dodge Ram Cummins Turbo Diesel Thats alot of BOOST! |
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#12 |
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Retired...
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210?? is that the optimal for the 2zz?? (just curious, would expect somewhere in the 240 range)
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1998 LS Integra - b18c swap, b16 transmission, CTR cams, milled head, Crome Pro, SC61, Revhard Mani, Johnny Racecar FMIC, walbro, RC 650's, self tuned...STOLEN!! = ( 2003 Neon SRT4 - AGP Zeta 3.0, DiabloSport Predator, 650cc's, home made return line, walbro, MPx FMIC, 5 layer headgasket, brian crower 2mm+ valves, N2MB Boost box, self tuned...hmm soon to be corn fed. Let's see how long it lasts |
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#13 |
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Registered User
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He showed me this in person and had the info for compression out of the Toyota bible while he was working on his motor on an engine stand Multitasker I tell you. You are god! Jeff is the man! Thanks for the awesome write up makes life easier!
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#14 |
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Turbokits.com Powered :P
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1. What is the point of removinge the power steering plug? Just wan't to know.
2. If you start the car in WOT (throttle fully open) you do not need to unplug the injector, they will stay shut! In fact this is the way you should start the car if the engine is "drown" for some reason. |
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#15 |
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gt-s owner since 02'
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nice job smaay, I had seen this done on an accord before but never knew the whole process myself. I'm glad you took the time to do a writeup.
Is there a certain size fitting that the compression gauge has to have in order to fit down in there right and get a proper reading? Or will any 5/8 compression gauge do the job?
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Want To Buy 03+ Front and Rear seatbelts plus latches OEM steering wheel For Sale o2 sensor, amp, hid bulbs, oem parts, etc |
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#16 |
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hookah me up
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210? isnt that really high? i thought 2zz's were supposed to compress at like 170? Isnt it the atmospheric pressure times the amount of compression, in our case 14.4*12.5=180...isnt that what is is supposed to be?
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2000 Celica GT-S 6SPD PutFile ****NEED DRIVER SIDE FENDER, 3P0 RED!!!**** PM me please! |
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#18 |
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Stealth BombeR
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180 is supposed to be tops.
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![]() 2000 White Toyota Celica GT-S -Boost soon to come Current DD 97 honda hatch w b18c1 boosted 433whp/309tq at 17lbs 544whp/381tq at 27lbs Want to Buy 2ZZ TIMING COVER PM WITH A PRICE! |
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#20 | |
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Turbokits.com Powered :P
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Quote:
But hey... I used my Celica GT for about two years with cylindre 1 at 135PSI and the other at 185PSI. The only drawback was taking an eternity going at 190km/hre... But my problem was only a bent valve so who cares.. |
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#22 | |
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Registered User
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Quote:
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#24 |
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(Anti)Social Psychologist
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I too am ~210 in all 4 cyls
![]() On a related note: If compression is good, does that also mean it's highly unlikely you have damaged (bent, burnt) valves? |
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#26 |
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FIRE IN THE HOLE!!!!
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i posted the spec on the bottom of the guide, read it
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2001 Celica GT-S 2ZZ-GTE 1997 Celica GT 5S-FTE 1997 Supra 6sp 2JZ-GTE 1990 Celica All-Trac 3S-GTE 1998 Dodge Ram Cummins Turbo Diesel Thats alot of BOOST! |
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