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1999 subaru legacy outback check engine light flashes and scan tool says cylinders 1 and 4 missfire. Reset the code and drive for a while and the same thing happens, any ideas?
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had miss fires with my 92 legacy gt.typical suby fault coil packs always go out in saying that check that you dont just have a foul or failed spark plug. easy fix if it is the coil i replaced mine with 2nd hand ones from the same model usualy find them at most subaru specialists wreckers etc depending on model.
Any time your check engine light is flashing this indicates an engine misfire that has the potential to damage your catalytic conveter. A diagnostic trouble code has been stored in the vehicles onboard computer that will confirm the engine misfire. Continued driving may ruin your very expensive catalytic converter located in your front exhaust pipe.
Good luck, I hope this answers your question.
the check engine light comes on if there is a problem with thecomputer system related to the emmision, when this is is repaired the light on can only be turned off with a monitor,code reader. some of these are quite inexpensive.over the web or at a part store.
u can clear/reset the check engine light either with a scan tool, hit clear codes, or u can just disconnect the battery, the scanner clearing method is preferred as disconnecting the battery can cause temporary stalling issues.
when you replaced the plugs , was one of them (cylinder 1 ) dirty and fouled ?
I'm thinking that bad rings in cylinder would give you low compression , and eventualy cause the missfire by fouling up the plug.
There is an inexpensive product that will help with the compression by filling up scratches in the cylinder walls. It is called Restore , and it is one of the only products of its type that I have used , and feel actually works.
Unfortunately , if your rings are broken , or badly worn , nothing in a bottle will fix them.
If your car had a distributor cap and rotor , I would change them too.
What's the check engine light code? You need to get the code(s) read using a code reader and then we can help. A place like AutoZone will read the code for free and then you can look it up at http://www.obd-codes.com/trouble_codes/
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