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[speakingclock]

I wonder if anyone could shed any light on a emmission problem please?

Just had my Omega 2.0 16v 1994 tested apart from every brake pipe being corroded, (I got a couple of rolls in the shed for such an occasion just need to purchase the ends) it has failed on Carbon Monoxide emmissions at fast idle!!  HC and Lambda passed  on all tests and CO was ok on natural Idle.  I've accessed the data link codes, these read 16 (Knock sensor), 52 (Engine Control Module?), 73 (Mass Air flow Meter), and 92 (Camshaft Sensor)  The CO levels were high on LPG too if thats any indication.  MOT is due in Feb so I've got some time.  Any Ideas or is it a lost cause?

[magnul]

That's lot of codes. 52 isn't ECU, it's EML fault. Regarding 92; is the engine i limp home mode (won't rev over 4500rpm)?
I'd say the most probable cause is the MAF if it's really broken. Cam sensor will disable sequential fuel injection, possibly causing poorer atomization and hence combustion of the fuel, but shouldn't be a problem with LPG. Faulty knock sensor will retard the ignition timing to a very knock-safe level and impair effective combustion. Just speculations; can the knock sensor code be a false code since it's unlikely to sense any knock when running on high octane LPG?

I'm sure one of the experienced guys will help you soon, but would start by checking the MAF.

[speakingclock]

Thanks Magnul, Checked when engine not running so that may flash codes up unnecessaraly.

[magnul]

The 2L must be checked with engine not running. With engine running the lamp won't blink out codes.

[speakingclock]

Oh Dear, have to think of options now.
Thanks again

[magnul]

All the sensors in question are reasonably cheap and easy to change. A bit strange that 52 shows up if you actually paper clipped it.
Could be a good idea to check live data from the sensors in question with techII. Since you're in Wales I guess you're not in the vicinity of TheBoy or Marks_DTM. My knowledge about UK geography is limited to knowing where Scotland and the very important place Islay is:-)

[speakingclock]

Thanks Magnul I'll start with the MAF it seems to be the easiest first and will eliminate one fault to start with.

[Kevin Wood]

The MAF is an expensive item to change and can be indicated falsely as a result of other faults, so I would be tempted to try the cam sensor first (common problem on 4 pots). Check for any induction air leaks as well, and make sure everything is plugged in securely.

Kevin

[speakingclock]

Thanks Kevin I'll do that. Thanks for your help.

Tony

[Kevin Wood]

On second thoughts, might be worth clearing those codes and seeing if they re-appear if you don't have any symptoms of "limp-home" mode, as you have some time on your hands.

Kevin

[magnul]

The MAF is an expensive item to change and can be indicated falsely as a result of other faults, so I would be tempted to try the cam sensor first (common problem on 4 pots). Check for any induction air leaks as well, and make sure everything is plugged in securely.

Kevin

Whoops. I thought I had seen them for ~£30, but found out now I was very wrong. Doesn't harm to check it though. Make sure all connections are tight, and clean the thingy with carb cleaner if it's gunged up.
Cam sensor is an easy fix IF the replacement works...

[speakingclock]

Hi Thanks Got the parts today I'll fit them at the week end then its hopefully just the brake pipes then.  Thanks again for all your advice.

[speakingclock]

Strange things cars... No sign not even a blink after starting of the EML 33 mikes to work, Parked up all day Started the car and EML light stayed on all the way home. disconnected the battery and re started then did paperclip test again.  Codes are 52, 73, and 92.  I've got new Cam sensor to go on together with a knock sensor, so I'll try those next.