To start off with -- 2000 LS aprox 135k miles.
Started with an occasional stumble going up hills, and then one evening I started it and it was running rough. Checked codes and had a P0307 - Cylinder 7 Misfire. Figured it was a coil gone bad, so went, bought a new coil and replaced.
To my misfortune, the car continued running rough, with the same code reapparing. I checked the spark plugs, and tested it out, and it was firing, fuel injectors appeared to be working. Also checked compression, was normal also.
After playing around, I noticed that you could completely unplug cyls 5-8 and the engine would run (actually pretty smooth). I tried unplugging cyls 1-4 (and just leaving on 5-8) and the engine would barely run if at all. It appears that if you unplug any cylinder 1-4 you can definatly tell there is no cylunder firing, but if you unplug any of cyls 5-8 you can barely if at all tell. Almost as if the entire side is not running or minimally running.
Took it too the dealer, and they believe (as I do as well) that its internal to the engine, but they are saying it will cost at a minumum 3000. They are assuming its a timing chain or tensioner, if its not they are talking about new engine, quoting me at upwards of $7000 to replace. Ouch.
Anyone had a similar problem, and know what it could be. Has anyone chained the timing chains? It looks to be a fairly involved process by the looks of it.
Started with an occasional stumble going up hills, and then one evening I started it and it was running rough. Checked codes and had a P0307 - Cylinder 7 Misfire. Figured it was a coil gone bad, so went, bought a new coil and replaced.
To my misfortune, the car continued running rough, with the same code reapparing. I checked the spark plugs, and tested it out, and it was firing, fuel injectors appeared to be working. Also checked compression, was normal also.
After playing around, I noticed that you could completely unplug cyls 5-8 and the engine would run (actually pretty smooth). I tried unplugging cyls 1-4 (and just leaving on 5-8) and the engine would barely run if at all. It appears that if you unplug any cylinder 1-4 you can definatly tell there is no cylunder firing, but if you unplug any of cyls 5-8 you can barely if at all tell. Almost as if the entire side is not running or minimally running.
Took it too the dealer, and they believe (as I do as well) that its internal to the engine, but they are saying it will cost at a minumum 3000. They are assuming its a timing chain or tensioner, if its not they are talking about new engine, quoting me at upwards of $7000 to replace. Ouch.
Anyone had a similar problem, and know what it could be. Has anyone chained the timing chains? It looks to be a fairly involved process by the looks of it.
