Author |
Message |
Ben Williams
Tinkerer VIC 1JZ VVTI
Posts: 30 Reg: 05-2009
| Hi, So i did a compression test on my motor yesterday. Dry test, cold, all plugs out, throttle closed (maybe should have been open?) Screw in type gauge, 7 cycles per cylinder 1: 50 2: 50 3: 55 4: 25 5: 75 6: 75 I really hope I did something wrong here or should I start looking for a 2jz? |
Aaron Casey
Goo Roo nsw '94 jzz30 gttl, 2 mini's one supercharged
Posts: 1920 Reg: 08-2005
| are you sure your gauge is accurate? try squirt a tiny bit oil oil down and try again. will help show if rings arent the best |
Ben Williams
Tinkerer VIC 1JZ VVTI
Posts: 31 Reg: 05-2009
| Yeah I think I'll try it with a different gauge. It is a new gauge though. Wouldn't surprise me though. It does run rough and you can hear a miss on idle. Bit of oil out the back as well... |
Ben Williams
Tinkerer VIC 1JZ VVTI
Posts: 32 Reg: 05-2009
| Also, I when I pulled the plugs out cylinders 1, 3 and 5's plugs were coated with oil... ? |
Matt Newman
TryHard QLD soarer tt
Posts: 179 Reg: 11-2007
| sounds like you need to replace your rocker cover gaskets. it is easy enough to do yourself and the gaskets were only about $80 from Toyota when i did mine. |
Matthew Sharpe
Goo Roo North Island JZZ31
Posts: 5230 Reg: 10-2005
| I doubt it would run at all if those figures were accurate! |
Miles Baker
Goo Roo Vic 66 Mustang GT Convertible, 55 Chevy Bel Air, 69 Firebird 455, 69 Nova SS Clone, 65 Mustang Fastback, 67 Mustang Convertible, 67 Camaro RS/SS
Posts: 2267 Reg: 08-2005
| Compression test should be done with.... Throttle: Wide Open. |
James Cahir
TryHard ACT Soarer TT
Posts: 350 Reg: 04-2008
| If those figures are correct, I think your engine would be barely running. |
Miles Baker
Goo Roo Vic 66 Mustang GT Convertible, 55 Chevy Bel Air, 69 Firebird 455, 69 Nova SS Clone, 65 Mustang Fastback, 67 Mustang Convertible, 67 Camaro RS/SS
Posts: 2270 Reg: 08-2005
| Come on people - he says right in his post he had the throttle closed. |
Scott Wilkes
Goo Roo Tasmania 92 TT Factory Manual, 70 HG GTS Monaro
Posts: 1288 Reg: 10-2008
| shouldnt make that much of a difference. I got 200psi throughout my cylinders few weeks back while the throttle body was closed, its how we always do it at work and we get no difference with throttle open or closed |
Shane Haverkamp
TryHard nsw soarer TT
Posts: 290 Reg: 10-2007
| was the gauge screwed in properly? done up realy tight? |
Boris Siljanoski
TryHard Western Australia Soarer GZ20 TT
Posts: 343 Reg: 11-2007
| Make sure Battery is full. Crank 4 times then get reading. Otherwise Try another gauge. |
Ben Williams
Tinkerer VIC 1JZ VVTI
Posts: 37 Reg: 05-2009
| Thanks for your replies guys! Turned out to be a faulty gauge. Replaced with another one and now I have 190 across all cylinders. very happy! Running like a new car now that i've changed the plugs too... |