For the last few weeks Ive noticed a misfire between 1-2k RPM. I decided to change the diesel filter and bought a bottle of Forte diesel treatment. The car was still misfiring so I decided to take to my local garage for it to be plugged into the diagnostic machine, due to no spanner light or engine management light being on no fault codes were registered.
Earlier this week the car/spanner light came on for around 2minutes on restart the engine management light was on and stayed on, the car was still misfiring but under load still pulled fine even with the eml on.
Ive since returned to the garage and had it plugged in again the following codes were registered ;
P0100 - Intake air temperature sensor circuit high input
P0100 - Intake air temperature sensor circuit malfunction
P0400 - Exhaust gas recirculation insufficient flow detected
After reading this forum for a few hours I decided to remove the EGR valve and have a go at cleaning it. I split the egr into two pieces and used carb cleaner to clean the spring. I didnt have the confidence to drill the 3mm hole in the top and tap out the spring in the electrical half of the EGR I did however notice that the spring that sticks out of this part was flush, is this how they should be ?
I also removed the boost sensor and gave that a good clean (was very sooty)
Ive changed the air filter and checked all pipes and connections.
Whilst doing this Ive noticed that to the immediate left of the EGR was a little bit of oil and around the swirl valve rod there was a lot of oil/gunk build up.
Ive got into the car this morning and to my surprise the engine management light has gone out but the car is still misfiring and doesn't have any guts until the turbo kicks in, if you slam your foot to the floor it does nothing until the turbo spins.
Ive booked the car in at Vauxhall on Saturday for them to use there diagnostic machine Im hoping its a little more accurate as to to faults, im a little worried that because the EML has gone out no faults will be registered.
Anyone have any ideas as to the problems Ive got? any help/guidance would be appreciated. I apologise for the long winded post.
Cheers in advance.