98 subaru legacy wagon 1 dead cly but has good comprestion???? 100lbs

5

Asked by Jun 28, 2014 at 09:15 AM about the 1998 Subaru Legacy 4 Dr Outback Limited AWD Wagon

Question type: Maintenance & Repair

1 dead cly good spark 100lbs comp no vac leaks  110.000miles belt has been done?????
check wire coil ect???????
                                            help/help

2 Answers

116,495

Which engine do you have? Unless it's turbo charged or Diesel engine your compression ratio is either 10.5:1 or 10.0:1. Your psi should be running 157.5 to 210 psi (10.5:1) or 150 to 200 psi (10:1). If you at 100 psi that's way to low. What are the psi numbers on the other cylinders? Add a little oil in that cylinder and see if psi rises. If it does then its a ring issue. If it does not its probably a valve issue.

116,495

Also if it's the 2.5L that's an interference engine. Meaning if timing belt breaks, jumps time or is not installed properly the pistons can come in contact with the valves causing bent valves.

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