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Cylinder 4 misfire
Car: Acura, RSX, 2005, 2.0LiVTEC z1 - Back to Fix-It - Acura Repair Manuals
Q.i have an 05 rsx-s. i misshifted and soon afterward check mil light came on. i read the code and it was a cylinder 4 misfire. i changed the plugs - it stayed illuminated. i switched 1 & 4 coil packs and still cylinder 4 misfire. i run 44k every 15-20k and so i expected the injectors to be ok. Finally i did a compression test and to my horror cylinder 4 only 90psi while the others between 150 & 155 psi. bent valves? exhaust or intake? what kind of machine work am i lookin at? is an engine swap the way to go?
I want to know my options and whats recommended. I would also like to know if there is any route with Acura that would help me - afterall this happened when the car was still under warranty, but the local service manager blew me off and said since it was documented as a mis-shift it's my fault and Acura won't help. I have 90psi compression in cylinder 4 from bent valve(s) and i want some professional unbaised advise please!
Answer Unfortunately this is usually pretty expensive when it happens. Since it still has 90 psi it just bent a few valves (usually intake) the guide will be broken as well. Dont drive it as it will cause more damage. If it's just the valves the machine work will usually run about $400.00 . motors for these are not easy to find since they get blown up pretty often. So it might be easer to fix what you have. Change the timing chain as well as they stretch when these hit in most cases.
Addition Can i expect any damage to the piston or rings? I know it's hard to answer all this without actually taking a look. This happened when the car was under warranty and first mil light was over rev. The dealership has it documented but the service manager basically blew me off when i asked for help from Acura because he said it was not the car's fault. Is there ANYTHING I can do or say to have them help?
Answer you can call acura CR and ask for goodwill assistance but they haven't been as willing lately to help on these. As far as piston or ring damage the only to tell is to take it apart but since you still have compression he one's i have seen will usually be ok. A lot of them break the valve and destroy the whole engine. Looks like it could have been worse.
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