10 replies to this topic

[kazza]

Hi everybods having few probs with 94 mini cooper with single point injection ... when doing tappets removed spark plugs to turn engine on the fan and discovered middle 2 plugs (2 and 3) black and sooted on electrodes and outer 2 plugs (1 and 4) white ..so appears middle 2 running very rich and outer 2 running very weak ... any ideas what this is caused by ? ... thanks for looking and cheers in advance .. andy

[Guess-Works.com]

caused by voodoo injection system... only way of solving that is connecting to a fault reader...

[Sprocket]

caused by voodoo injection system... only way of solving that is connecting to a fault reader...

lol :grin: :grin:

voodoo indeed This happens on carbs as well you know :cheese:

On the five port heads there is always a slight difference between the middle and outer cylinders when using a 'single' inlet system which causes uneven fuel distribution but not so much as to be that noticable.

I'd suspect an air leak on the manifold gasket try tightening up the nuts from the left and right towards the center, six in total. Another thing could be a leaking exhaust on one of the down pipes.

If GuessWorks forgets that it is an injection system, he should be able to put his vast knowledge to use as to the causes of fouled plugs:cheese:

Do the fouled plugs look dry or wet?

Is the engine running well? Any missfire, uneven idle?

What mileage has the engine endured?

[kazza]

Thanks for those replys ... plugs are dry looking but very carboned motor has done 80k only prob i have noticed is sometimes very slow to pick up when pulling away from junctions or accelerating hard .. flat spot i guess its an auto by the way dunno if that matters will have to check out for leaks etc at weekend .. but starts 1st turn always and appears to run ok

[Sprocket]

When was the oxygen sensor last changed?

[kazza]

AH ! dont know that only had car for 2 months .. have fitted new plugs dis cap rotor arm leads etc .. would that be the 1 on the cat or is it else where ? ..

[Sprocket]

its on the exhaust manifold. To find it look down past the left side of the injection manifold at the exhaust and it sticks out at an angle towards the drivers seat. It has four wires. Cant miss it. Might be worth getting it changed, this may be causing the running problems, they have a tendancy to cause the engine to over fuel when the start to fail

[kazza]

OK thanks for that will have a look ... any other things worth checking ? ... thanks again for the advise ...andy

[spiinthestates]

its on the exhaust manifold. To find it look down past the left side of the injection manifold at the exhaust and it sticks out at an angle towards the drivers seat. It has four wires. Cant miss it. Might be worth getting it changed, this may be causing the running problems, they have a tendancy to cause the engine to over fuel when the start to fail

I see mention of the bosch replacement (0258 003 193) O2 over the OEM lambda one, is there a current online supplier of the bosch part anyone knows about that 1. has it in stock and 2. ships international to the states?

I found it on the left side last night, the wires gave it away.

Thanks,
James

[Robbie]

Wow!!! 5 year old bump!!!!

[spiinthestates]

Yeah sorry about that, I guess i should have opened up a new topic on it. Always do the correct thing second is how i roll it seems.

J