Peugeot 807 Misfire

I've got a 2004 Peugeot 807, gasoline engine, with 207k km. It's throwing combustion misfire codes. I'm getting a rough idle, the check engine light pops on and off, and it's jerking when I try to accelerate. Power is way down. I've checked spark plugs and ignition coils, but no dice. Could this be a fuel injector issue?

4 comment(s)

Sounds familiar. I had similar issues with my old Volvo V70. Rough running, hesitation, the whole shebang. For me, it turned out to be a faulty fuel injector. Have you tried checking the fuel trims? That might give you a clue if it's fuel-related.

Fuel trims, huh? I've got an OBD2 scanner, but I haven't really dug into the fuel trim data. What should I be looking for exactly? Like, what values are considered 'normal' vs. showing a problem?

Basically, you're looking for anything too far from zero. Big positive numbers mean the engine's trying to add fuel, which could point to a lean condition caused by a bad injector. Honestly, it's probably time to get it properly diagnosed at a workshop. They can do a proper injector test.

Cheers, appreciate the insight! Ended up taking it to a mechanic, and you were spot on – faulty injector. New injector fitted and all misfires gone, cost me 515€. Runs like a champ now!

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