engine light on, missfireing :/

[shigeri]

hey just wondering if anyone can help ?

i have a saxo vtr mk 2 w reg and was casually driving wen the engine like half cut out , stopped and it was idleing bad , dropping to around 400 revs and bouncing back up , sounds like it missfireing wen you put the accelerator down but still drives in 1st gear sounding really bad but slows down wen put into 2nd gear , if you leave the engine off for 20 minutes or so and it drives again fine but the engine lights constantly on and eventually within a few miles does ot again :S tried new spark plugs and it still does it , anyone have any idea ?

cheers all , karl

[Vtr_HBO]

YEah, Had the exact same problem, I took off the map sensor, idle valve control sensor, lambada sensor, cleaned them all up with carb cleaner nice and rosey

shoved the lot back on and it was purrrrrrrfect

Works a treat

[shigeri]

not to biga job then ? not sure what 2 of them are so ill ask a mechanic to point them out to me :P was told by kwik fit it could be at a guess the coilpack and there kinda pricy lol
thx for the help :)

[shaneio]

it will more than likely be your lambda sensor by the sounds of it. take it out give it a clean and see if it works better, if not you'll probs have to get a new 1

[Liam_]

MAP sensor I rekon. It's on the inlet manifold - remove it and give it a clean. :y:

[shigeri]

fairenuff , its just confusin the way it does it randomly :S lol ill giv it a clean tomorow and see what happens , thanks dude :)

[shigeri]

MAP sensor , does it also have a connection to the coil pack with a clip with 3 or 4 wires in ?

[Liam_]

It's not connected to the coil pack mate. Should be a small square-ish unit on the left hand side of the inlet manifold, near the bulkhead. It will have a bolt holding holding it to the mani and a connector leading to it.