|
|
|
|
| PEUGEOT CAR CARE - TIPS AND TRICKSBack to Peugeot Car Care INDEX
|
Peugeot 206, 306 (1994 - 97) : Idle problems and/or blown ignition coil.
Peugeot 306 1.4 / 1.8 (16V) and 406 1.8 (16V) models from 1997 to 2002 fitted with Sagem SL96 engine management ECU .
Another common problem with the Peugeot system:
Sagem SL96-9 this ECU blows due to the ignition coils breaking down.
This manifests it self as a misfire and the engine will be erratic at idle or may not start.
The only way to resolve this is to replace the ignition coil and repair/replace the ECU.
Peugeot, all models 1993 - 2004 onwards
Emission Failures:
High CO & low lambda reading. Common causes of rich running faults are the lambda sensor or the ECU (engine control unit) both of these parts are relatively simple to check, to check the sensor strip back the insulation on the signal wire from the lambda sensor, this wire is usually black. Then hold the bare wire between your finger and thumb then touch your other hand on to the battery positive the internal resistance of your body will give 1volt at your finger tips which is what the sensor would give out when the engine runs rich, if the emissions come down then you have a faulty lambda sensor or wiring but if the emissions remain the same then the ECU is a possible fault.
Peugeot 306 didn't appear to be running to badly other than sounding slightly ragged at low speed, but it was only doing around 20 to the gallon, and felt a little rough on low speed acceleration. Tuning checks showed the exhaust gas to be much to rich, but because this was a catalyst equipped model this should not be possible as if the engine did produce too rich a mixture then the catalyst should clean it up to produce a clean exhaust from it.
Unfortunately the catalyst will only cope with a moderate degree of over richness to it - beyond this and if left too long it will cause irreversible damage to the catalyst. First thing to do though was to correct the cause of the over-richness since a new catalyst would soon go the same way as the old one otherwise.
Engine management systems checking revealed an oxygen sensor with a poor output - this sensor monitors the efficiency of combustion by checking the oxygen content in the exhaust, if it gives wrong readings then the fuel injected into the engine will be wrong as well. Removing the sensor is an achievement on it's own since these sensors spend their working lives in a corrosive acidic mixture of hot gases and water vapor, revealed an oxygen sensor blocked with carbon deposits. The sensor was cleaned and re-fitted, this will sometimes revive it's performance, always good news because they cost around 100 euro to renew. Do installed an exhaust gas sampling line before the catalyst so that the mixture could be checked before and after the catalyst and re-checked the gas mixtures. Into the catalyst OK, but out of the Catalyst no improvement over the input. However a quick blast up the road and another re-check and the catalyst was starting to work a little again. Another few more miles and it improved enough to get through an M.O.T. Caught the problem just in time.
Best Wishes to all..
See also: MOT Test Checks
Back to Peugeot Car Care INDEX or go to Top of this page
|
|