1998 GMC Yukon "150 psi good compression 98" Questions

...120 to 150 psi is good, if ok , check #2. If this has the older efi intake, its rare, but also could have a failed intake gasket for that cylinder and be sucking oil from underneath.Hope this

...150 psi or in the green if it has no numbers .. if it is low then the problem may be badly seated valves or cylinder head gasket ...... also check the fuses the it may be something as simple as that ...

...150 psi in each one. You will almost certainly find one or both banks of cylinders have 50-80 psi or so, which indicates bent valves. The fix for this requires that the heads be removed and the bent ...

150 or more PSI compression on all 6 cylinders? The PCM;/ECU can also go to limphome mode, and do that. easy. bad sensor inputs, do that, and DTCs are stored. is that a real scanner or just cheap code