alfredeis8

Peugeot 807 Cold Start Rough Running

Hi, I'm having a nightmare with my 2006 Peugeot 807 (gasoline engine). It's got about 61,000 km on the clock and starting terribly when cold. The engine runs really rough for the first few minutes, like it's misfiring. It smooths out once it warms up, but those initial few minutes are brutal. It feels like a kangaroo trying to hop! I've tried checking the spark plugs and air filter, but no luck. Any ideas?

The main issue discussed is a 2006 Peugeot 807 experiencing rough running during cold starts, suspected to be due to misfiring. Initial checks of the spark plugs and air filter did not resolve the problem. A suggestion was made to consider faulty injectors as a potential cause, which was confirmed after professional diagnostics. Replacing the cold start injector resolved the issue, restoring smooth engine operation.

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4 comment(s)

Sounds frustrating! I had a similar issue with my old Volvo V70, though mine was a diesel. The symptoms were almost identical: hard starting and rough running when cold. In my case, it turned out to be a faulty injector. The ECU wasn't getting the fuel mixture quite right when cold, causing problems. Have you considered the injectors might be the culprit?

Injectors, huh? That's interesting. I hadn't really thought about those. Is there any way to test them without taking them all out? I'm not sure I have the tools or the know-how to do that. Or, is there a fuel additive I could try that might clean them out?

Unfortunately, I don't know of any reliable way to test them yourself. With my Volvo, the garage ran some diagnostics that pinpointed the faulty injector. As for fuel additives, I'm always wary of those 'miracle cure' products. They might help a bit, but I doubt they'll fix a truly defective injector. Honestly, your best bet is probably to take it to a workshop and get it properly diagnosed. It's worth the cost of a proper diagnosis to avoid potentially causing more damage by trying to DIY it.

Thanks for the advice! I think you're right; I'll bite the bullet and take it to a shop. It was indeed the cold start injector as you suspected, it needed replacing. Cost me 515€ but runs great again.

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