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Peugeot 306 rough running

Posted By quietandy 12/23/2008 3:54:56 PM
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quietandy
 Posted 12/23/2008 3:54:56 PM
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Hi all,

This is regarding a Peugeot 306 1.6 1998 (bosch 5.2 ecu). Have had a problem which has been getting worse over 3 months. There are many symptoms so I'm hoping someone may have experience with and be able to pinpoint the problem before I start throwing money at it.
Symptoms:
1) Rough idle. Surges around 1000 rpm. Has a definite misfire once engine warmed up.
2) Loud whining sound, sounds like alternator, only really audible at idle+electrics on
3) Pinking. When engine gets hot (traffic start-stop), it can be quite severe.
4) Stuttering when on light/mild throttle between 1500-2000ish rpm, also jerky when applying throttle suddenly.
5) A flat spot in acceleration, after having changed gear (this was the 1st noticable symptom)

I've changed the coilpack a while ago as the old one was cracked, has made it a bit smoother in general but not helped the above. I realise I need to do some detective work (i.e look at spark plugs etc) but I thought it might be worth the ask, especially since I cant do anything until after Christmas. I'm thinking its a vacuum leak, o2 sensor or fuelling issue. The pinking doesn't happen when its very cold and the stuttering is getting worse every week. There is still plenty of power though. I had a blocked breather pipe prior to these symptoms which caused the fuel tank to start imploding. Could this have damaged the pump? I dont know what could cause such a variety of problems!

Cheers
3/5/2009 5:04:27 PM by quietandy
K And R
 Posted 12/23/2008 4:23:51 PM
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Andy

Welcome to the BBA Forum BigGrin

There is some much info on 306,s if you use the Forum search button above (just below the BIG RED Forum button) Start there first Wink

Kev.

"If you dont KNOW how it works, don,t try to test or fix it"

quietandy
 Posted 12/23/2008 4:36:33 PM
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right will do,

cheers Kev
quietandy
 Posted 1/10/2009 8:38:10 AM
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Didn't realise how much knowledge there was about Peugeot on this forum, have def come to the right place then! Have had a look at previous posts...I'm going to try and get this sorted now. Bearing in mind the main problems are small misfiring at idle (when warmed up), lots of pinking when engine gets hot and general rough throttle/surging acceleration, I'm thinking of replacing the lambda sensor and coolant temp sensor. Do you think this is a wise move? I've checked for a vacuum leak with wd-40 but didn't seem to have any effect (hard to tell when idle is surging about!)
Angus
 Posted 1/10/2009 1:04:36 PM
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Andy

I wouldn't change those parts without a lot more evidence.

One strategy that has always served me well; is, when confronted by confusing symptoms, concentrate on investigating the easiest one - it may lead to a cure for all.

As you mention pinking [I understand that to mean a metallic rattling from the engine under load] why not start by checking the ignition timing with a strobe light.  [Many old hands still have theirs from the days of contact points - you may need four bits of old HT leads to extend the coilpack for testing, or try just resting the clamp on No. 1+4 coil with a loop of wire in it's jaws.]

It should appear rock-steady at idle [around 6 to 10 degrees BTDC] and should advance, progressively, when revved.

Ideally; you need to get the fault-codes and the extensive live-data values checked.  I've a feeling that timing or MAP values are incorrect here.

What make of spark plugs are fitted - these should ONLY have the genuine [Bosch] ones.  Has it got a long Sagem coilpack?

.

quietandy
 Posted 1/10/2009 1:40:39 PM
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Thanks Angus for your response. I currently have NGK spark plugs but have some Bosch ones I'm fitting on Monday. The coilpack was a Sagem one but the square turret version. This was cracked and replaced a few weeks ago but has made very little difference. As regards fault codes, my 306 has a 16-pin connector under the steering column. I've read on other forums that normal code readers cant communicate with it as its an 'in between' year. I have tried a standard cheap reader which confimed this. Is it a fairly straightforward DIY job to check the timing then?

It's definetely pinking, but not when the engine is very cold. Sit in traffic for a while until engine is hot and and you can barely accelerate without it pinging all over the shot.
1/10/2009 1:58:04 PM by quietandy
Angus
 Posted 1/10/2009 2:30:39 PM
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Andy

These hate NGK plugs - nothing wrong with NGK as a brand, it's just a matter of compatibility.

Interesting that you've recently changed the square coilpack.....  I've seen failed Sagem packs spike the ECUs on these and send the timing-control circuits scatty.  As you have HT leads, [that was the change year to a direct-fit coil] a timing-light check is easy.

The only tools that will read these are the professional ones - invest a few quid in getting that done.  The live-data will show the actual timing and the sensor readings.

.

quietandy
 Posted 1/10/2009 2:42:00 PM
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The possibility of a spiked ecu did cross my mind- I thought it only affected the Sagem sl-96 ecu's though. Are the bosch ecu's also vunerable then? I'm having a look at timing lights now, cheers.
Angus
 Posted 1/10/2009 3:47:23 PM
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Andy

No electronic component is invulnerable to leaking HT voltage. 

You must be able to borrow a light - everybody used to have one.  Do you know any older ex-trade or "classic" enthusiasts?

.

MATOSCAR
 Posted 1/11/2009 5:32:21 AM
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Has the valve timing been checked ?

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