Cylinder Compression Values

SupraSleuth · 08-16-2009, 03:20 AM

I have an '89 Supra (7MGE) with 133K miles. It runs great, but I decided it was time to change the spark plugs. I also wanted to do a compression check before installing the new plugs. The service manual indicates a desired compression value of 156 psi or more, a minimum desired value of 128 psi, and no more than 14 psi difference among cylinders. The average values I obtained ranged from 207 to 217 psi. I did not expect to see values this great and now I am wondering if my compression guage is not properly calibrated. Insight anyone ??

08-16-2009, 03:20 AM	#1
SupraSleuth Stock Join Date: Aug 2008 Location: USA Posts: 9	Cylinder Compression Values I have an '89 Supra (7MGE) with 133K miles. It runs great, but I decided it was time to change the spark plugs. I also wanted to do a compression check before installing the new plugs. The service manual indicates a desired compression value of 156 psi or more, a minimum desired value of 128 psi, and no more than 14 psi difference among cylinders. The average values I obtained ranged from 207 to 217 psi. I did not expect to see values this great and now I am wondering if my compression guage is not properly calibrated. Insight anyone ??