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Old 05-07-16, 08:39 PM   #1
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Default Annoying misfire.

So, I recently bought a 2005 307cc 1.6 and it has a slight misfire. It starts and idles well, cold or hot. If I accelerate it's fine too. The problem is when I just ever so slightly touch the gas.

Typical scenario, going down a slight gradient at about 30 mph, in 3rd gear so doing about 2000 rpm. If I'm off the gas it'll slow down so I just press the accelerator a tiny bit, that's when it starts spluttering.

I figured I'd get myself a ODB thing and have a look for any error codes. Got that today and plugged it in but there are no errors showing at all.

Any suggestions where to start? I plan to take a look at the plugs, and I should probably check the air filter too.
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Old 05-07-16, 09:48 PM   #2
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Hey did you manage to figure this out? I have a 2l 307 cc 04 plate with the exact same symptoms.

I've changed sparks, coil pack, cleaned throttle body, checked secondary air pump. It has something to do with the air intake I'm sure.

I don't suppose you know where the air idle control valve is? I've been looking for it all night as that is my next port of call.
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Old 06-07-16, 07:14 AM   #3
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https://www.peugeotforums.com/forums/...gnostic-28190/


https://www.peugeotforums.com/forums/...70/#post529130
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Old 20-07-16, 03:47 PM   #4
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OK, we've done a diagnostic. There were a few engine codes, but I think they were old ones:

Engine ECU
Intermittent fault. Engine coolant temperature signal Coherence
Intermittent fault. Fan assembly high speed command fault
Remote intermittent fault. Stop lamp information
Intermittent fault. Ignition-integrated phase detection Coherence
Intermittent fault. Fault: piloted engine stop-and-start (DAMP) Short circuit to earth



We cleared them, ran the engine for ten minutes and none returned. Revs were all over the place though.

What I did notice though when running live data measurement were these:



The ignition advance was jumping all over from 6 to 15. Is that normal?

The O2 sensor voltage was also showing between 0.1v and 0.5v, with upstream sensor inactive. Again, are these normal? I'm more a diesel man.
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Old 20-07-16, 03:53 PM   #5
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Hmmm, reading this thread, the voltages seem normal:

https://www.peugeotforums.com/forums/...ank-1-a-24871/


If it were me I'd probably follow the tips on that thread, maybe give the electrical connectors to the throttle a good dose of electrical cleaner.
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Old 20-07-16, 04:00 PM   #6
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And, as promised, details of your door handles. They do have electrical connectors in them:



Again, I'd be in there with electrical contact cleaner.

If you fancy taking both door trim panels off you could get the multimeter out and do some comparison tests between driver and passenger handles.
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Old 20-07-16, 05:38 PM   #7
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The symptoms you are experiencing are very common on this engine in ALL the cars its fitted to 206 GTI 807 406 407 various citroens and fiat ulysee all use it and it affects them all a service will help but you will never totally cure it.
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Old 20-07-16, 07:17 PM   #8
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Quote:
Originally Posted by Gibbo View Post
If you fancy taking both door trim panels off you could get the multimeter out and do some comparison tests between driver and passenger handles.
That's an option, although they're a pain to get into. At least I know what I'm looking at. Thanks.
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Old 20-07-16, 07:19 PM   #9
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Quote:
Originally Posted by reliable406 View Post
The symptoms you are experiencing are very common on this engine in ALL the cars its fitted to 206 GTI 807 406 407 various citroens and fiat ulysee all use it and it affects them all a service will help but you will never totally cure it.
Ah, the old "They all do that, sir" thing.

Well, I'll check/clean a few connections. I've had the plugs out, they all look fine. Air filter looks ok too.
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Old 21-07-16, 06:42 AM   #10
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Hi Gibbo
Just read this post and i have had this problem on one of these before we found it in the end and i was intermittant fault with crank sensor voltage would be stable for so long then go haywire so we changed it and problem solved . not saying this could be same but multimeter test on crank sensor would show this up where diagnostics may not because it may be within pugs tolerences but fluctuate when running thru rev range
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