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The car has 193,xxxmiles and no check engine light, no stored codes found. The car is a 2004 5mt forester xt. On a cold start the vehicle idles at 1.5k. It gruadually lowers to as it warms up. Once warm the vehicle is idling rough and rpms seems to be surging just a bit. Took the car to get looked at regarding the rough idle and since its so high milage and i wanted to know the general health of the car i asked for a compression test as well. The place i took it too specializes in subies and buggys with boxer motors.
Ok, so i got the results, first after searching for the source of the rough idle they were unable to locate any issues. Said they ran a smoke test and all the vaccum lines are good, no leaks, pvc system working and no oil build up anywhere or leaks. Said he was surprised for a car of its milage because all the rubber seems to be in real good shape considering the age. When taking it on a test drive said he felt the rough idle and noticed a misfire but when back at the shop couldnt find the source of the misfire as all coils and cylinders seemed to be firing normal plus no check engine light is present. Then went on give me the results of the compression test, 120-122 across the board. Said it was low but the vehicle runs well and drives well plus the numbers didnt wildy deviate from one another so it seems ok just old. He said the leak down test didnt point to any direction as there was a minimal loss of pressure and he contributed it to worn rings or possibly sticky valves. Mentioned again that its got some milage so considering its running strong and unless your looking to rebuild you can just drive it. It seems fine. It continued to tell me that they were unable to locate the misfire rough idle issue but suspected that possible fuel injectors.
I dont feel like ive actually learned anything useful about the car...
So ive done a bit of reading and from what i can gather the compression on these xts should be between 150 and 180? Im not even exactly sure pf the engine code for the motor. Im pretty new to the boxer motor.
Any body have any input on this motor and idea what could be cause a rough idle and missfire? Do these compression numbers seem too low? Should i invest into looking for the cause of the misfire or rebuild? Can i rebuild just the block? New pistons new rings new gasket same old head. I am really trying to get at least 1.5 more years of this motor in normal driving before having to rebuild the motor. Im currently strapped for big project money.
Thanks for reading it all. Sorry for any grammatical errors lol.
Ok, so i got the results, first after searching for the source of the rough idle they were unable to locate any issues. Said they ran a smoke test and all the vaccum lines are good, no leaks, pvc system working and no oil build up anywhere or leaks. Said he was surprised for a car of its milage because all the rubber seems to be in real good shape considering the age. When taking it on a test drive said he felt the rough idle and noticed a misfire but when back at the shop couldnt find the source of the misfire as all coils and cylinders seemed to be firing normal plus no check engine light is present. Then went on give me the results of the compression test, 120-122 across the board. Said it was low but the vehicle runs well and drives well plus the numbers didnt wildy deviate from one another so it seems ok just old. He said the leak down test didnt point to any direction as there was a minimal loss of pressure and he contributed it to worn rings or possibly sticky valves. Mentioned again that its got some milage so considering its running strong and unless your looking to rebuild you can just drive it. It seems fine. It continued to tell me that they were unable to locate the misfire rough idle issue but suspected that possible fuel injectors.
I dont feel like ive actually learned anything useful about the car...
So ive done a bit of reading and from what i can gather the compression on these xts should be between 150 and 180? Im not even exactly sure pf the engine code for the motor. Im pretty new to the boxer motor.
Any body have any input on this motor and idea what could be cause a rough idle and missfire? Do these compression numbers seem too low? Should i invest into looking for the cause of the misfire or rebuild? Can i rebuild just the block? New pistons new rings new gasket same old head. I am really trying to get at least 1.5 more years of this motor in normal driving before having to rebuild the motor. Im currently strapped for big project money.
Thanks for reading it all. Sorry for any grammatical errors lol.