Iflyfish Posted March 20, 2023 Share Posted March 20, 2023 What would a good compression test reading for my '87 Sunrader 4 cyl engine be? Thanks, Iflyfishunderpressure Quote Link to comment Share on other sites More sharing options...
WME Posted March 20, 2023 Share Posted March 20, 2023 (edited) Toyota 22r compression specs, warm engine Nominal 170 psi Minimum 142 psi Max variation between high and low cylinder 14 psi Remove ALL the sparkplugs, block the throttle wide open, EFI? remove the fuel pump fuse. Then do the compression check. If the readings are low, a couple squirts of oil in each cylinder, one at a time and then bump the start for a few revs. Recheck compression, if still low, suspect bad valves. If the readings jump up to normal, suspect bad rings Edited March 20, 2023 by WME Quote Link to comment Share on other sites More sharing options...
Iflyfish Posted March 20, 2023 Author Share Posted March 20, 2023 12 hours ago, WME said: Toyota 22r compression specs, warm engine Nominal 170 psi Minimum 142 psi Max variation between high and low cylinder 14 psi Remove ALL the sparkplugs, block the throttle wide open, EFI? remove the fuel pump fuse. Then do the compression check. If the readings are low, a couple squirts of oil in each cylinder, one at a time and then bump the start for a few revs. Recheck compression, if still low, suspect bad valves. If the readings jump up to normal, suspect bad rings Quote Link to comment Share on other sites More sharing options...
Iflyfish Posted March 20, 2023 Author Share Posted March 20, 2023 Thank you very much! Very helpful! Have a good one Iflyfishrelieved Quote Link to comment Share on other sites More sharing options...
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