DB9 Top Gear Track
AO Silver Member
Join Date: Jan 2007
Location: United Kingdom
County: East Sussex
Problem *appears* to have been cured by cleaning the MAP sensor. Until today I had no idea where this sensor is.
Remove the top engine cover, it's right there on top of the gubbins at the back, middle (well a bit to the left of middle) of the engine, held in by a single 10mm bolt. Removed the MAP sensor and could see a little green cage that was choked with soot. Gave it a good clean which revealed the sensor inside the cage, refitted and it's running a treat.
I made that sound easy didn't I? Far from it, if only I'd left it at the MAP sensor. I also had a go at checking that state of the inlet manifold butterfly behind the intake hose, that was indeed covered in oily soot but was moving freely, so far so good.... couldn't see much peering inside the manifold so decided to remove the EGR again to see if it let in any light and...... dropped the lower EGR gasket - bugg3r it!!!!
Couldn't see it anywhere, and what's more removing the EGR didn't allow any light into the manifold. After about and hour of cursing, fumbling, lifting the car, trailing an inspection light I finally found it - phew!
So, put it all back together, and decided to have a go at cleaning the MAF, had to remove the battery tray as I had to reconnect the MAF connecter anyway, and dropped a batter tray bolt, now I'm really getting my hair off, car up in the air again, undertray removed, again could find the thing anywhere. Got Mme. Pubsinger with the inspection light to help, only took around 45 minutes this time found it resting on a ledge at the bottom of the wing by the undertray mounting point nearest the wheel.
Back to the MAF which, unlike my old 156, is held in with a couple of 10mm bolts, top was is easy to remove, the lower one wins my prize for the most inaccessible bolt I've ever seen. A 10mm spanner and 1/8th of a turn at a time finally got it off, only to find that the MAF is a sealed unit and cannot be dismantled to clean.... brilliant!!
Ah well that was my Sunday morning, all put back together now and running a treat.
Time for a beer
All the best