Cleaning throttle body

[Skezza]

Hello,

I think the car sometimes goes into limp mode (EML flashing) and the car often vibrates on pull off, especially in the cold. I've changed the coil pack and spark plugs, no luck there.

I'm going to try cleaning the throttle body. Is it just a case of disconnect the air intake, and clean the flap? Or is there something more to it than that?

[Capncol]

You would be better off getting a proper diagnosis as it could be many things.
Not sure why you think TB, but essentially yes- that's how to clean it.

[Skezza]

I've got the error codes, but the symptoms (and codes) seem to match this thread perfectly:
http://www.peugeot206cc.co.uk/viewtopic.php?f=4&t=15441

Perhaps I need to do that injector test. Swap one round. I need to get a bloody Haynes manual for this car as well.

[Spitfire6]

Hi,
When my 2L had similar faults as yours:
Coil pack connector was not good as connector hold on clip was broken. Firing was erratic and felt light engine mounts were shot.
Took coil pack off and measured resistance; Open circuit on one pair. Replaced over a year ago and no problem since.

Easy to check with a multimeter, as you have 4 coils and two feeds. multimeter test will not prove that you have a HT problem though.

Cheers,
Iain.

[Skezza]

That's worrying. The coil pack was replaced about 12 months ago, but they used an aftermarket part and didn't replace the sparkies (and my missus was always difficult about me doing it).

Sparkies are changed and it's certainly doing it less, but it's still occasionally happening.

I went retro yesterday, stuck in a bottle of RedEX with half a tank in the car. Car was certainly making some very funny smells at first (wonder if that's just gunked up crap?) but is now running a lot better, so if it was the injectors that's usually the cheapest way of cleaning them. If they're shot though, I might need to replace the coil pack as well.

This might sound daft but what are the rocker cover gaskets like on these things? Do they often split or rupture? Could the oil be leaking into the spark plug socket? I did notice a bit of an oily/fuelly substance on the spark plugs when I removed them and they electrodes were very very white.

[Capncol]

I would be looking for either an air leak in the inlet system, a dodgy O2 sensor, or throttle body fault as the engine is obviously running lean.

[gazza82]

What coilpack is now fitted and what make of spark plugs ??? There are some coilpacks and plugs that just do not work together .. I'd need to reasearch which ones again but it might be Sagem coilpacks and NGK plugs ..

Also if you clean ANY throttle body and it is an electronic one you risk breaking the electronics that control the throttle. Strip the throttle body back as much as you can before manually opening and closing the butterfly.

[Skezza]

I would be looking for either an air leak in the inlet system, a dodgy O2 sensor, or throttle body fault as the engine is obviously running lean.

How would I detect an air leak? Or is it just about looking? I've not checked the O2 sensor, could be a worthwhile shout. I'm just glad it's not the gearbox which I was slightly worried it was at first. Throttle body, I've got some carb cleaner I'll give it a blast this weekend.

What coilpack is now fitted and what make of spark plugs ??? There are some coilpacks and plugs that just do not work together .. I'd need to reasearch which ones again but it might be Sagem coilpacks and NGK plugs ..

Also if you clean ANY throttle body and it is an electronic one you risk breaking the electronics that control the throttle. Strip the throttle body back as much as you can before manually opening and closing the butterfly.

The coil pack is an aftermarket one from EuroCarParts. I forget the name. I could change it again, but it's obviously expensive.

The Sparkies are Super 4's as recommended from here.

I wasn't really planning on doing a full clean. Maybe removing the air intake and spraying some carb cleaner in one full throttle or something when the car was warm? Can you not realign the throttle body? Does it not do it automatically?

[Capncol]

For an air leak, listen for a hissing noise. Use a length of tube as a stethoscope.

[IanL]

Another tip for a vacuum leak - spray an imflammable vapour (such as contact cleaner - not WD40) - when it gets sucked in, the engine will speed up. When that happens, note where you are pointing the nozzle.

[gazza82]

Super 4s will be ok.

You do have to be sure any diag system is compatible with a Peugeot. It us a bit non-standard and I've seen diffferent codes throw up with different readers. So it can mislead you.

[Skezza]

Well, the codes it threw on my OBD2 are:

P1338
P0302
P0420

[Skezza]

Lemark is the name of the coilpack i used from Euro. Was about £50 odd quid. I'm actually wondering if it's gone again.....?

They've not got the best rep on the internet. I could go Euro again or buy one second hand off eBay or alternatively go OEM?

It seems to be going into LHM once a day, when she first starts it in the morning usually. The engine management light will blink and the car obviously drives awfully and stalls easily. Once it's warmed up a bit, it drives better but not perfect still. That does scream coil pack to me, however on the screen it goes from reading "Anti-Pollution Fault" to reading "Catalytic Converter Fault" when going into limp mode.

[gazza82]

P1338 - misfire Cylinder 2
P0302 - ditto
P0420 - catalyst system efficiency below threshold bank 1 - probably as the car isn't running right.

Thing is .. are these right? Peugeot is NOT truly OBD2 .. OBD2 is the US variant and only Peugeots imported to US would be 100% compatible.

Don't think you have stated which year your car is? Makes a difference on OBD standard.

Lemark? Never heard of them. I risked a second hand one a few years back and it's been fine on our 2.0 with Super 4s. Can't remember the make though.

[Skezza]

It's an 02 reg 2.0. I believe it's the earlier model, because the oil filter is underneath rather than in the engine bay.

http://www.ebay.co.uk/itm/Peugeot-206-C ... SwTA9X2ZPf

At £25 a pop, that's tempting.