16-09-2018, 08:32 AM
Cheap scanners bought off the web won't read these. Lexia3 / PP2000 is the way to go but even then you might not get a code that points to something specific. (Have had a similar problem n it just said fuel trim was out, which can be caused by a lot of stuff). Where in S Wales are you?
Vehicle is in open loop when cold so small air intake leak would get ignored until warmed up a bit. Could poss be lambda too. That's where I'd start. Emissions check at garage would help rule those out.
Beyond that a poor signal from other sensors (e.g. coolant temp, MAP, air intake temp) could cause poor running / misfire. Reference voltage to sensor as well as sensor itself need to be investigated. Have you got a multimeter?
This a a very useful site with a page specific to misfires. Ignore the bit about misfire codes ...that's for later OBDII vehicles. https://www.aa1car.com/library/misfire.htm
Vehicle is in open loop when cold so small air intake leak would get ignored until warmed up a bit. Could poss be lambda too. That's where I'd start. Emissions check at garage would help rule those out.
Beyond that a poor signal from other sensors (e.g. coolant temp, MAP, air intake temp) could cause poor running / misfire. Reference voltage to sensor as well as sensor itself need to be investigated. Have you got a multimeter?
This a a very useful site with a page specific to misfires. Ignore the bit about misfire codes ...that's for later OBDII vehicles. https://www.aa1car.com/library/misfire.htm
