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[Kevin Wood]

You really need to look at the stored fuel trims using a tech 2.

If you get something putting the lambda sensor readings out constantly, such as a manifold leak upstream, the fuel trims will gradually take the mixture out until you have problems starting (lambda sensor is not used at startup, but the fuel trim is still applied).

[x1xv45]

You really need to look at the stored fuel trims using a tech 2.

If you get something putting the lambda sensor readings out constantly, such as a manifold leak upstream, the fuel trims will gradually take the mixture out until you have problems starting (lambda sensor is not used at startup, but the fuel trim is still applied).

I PM'd the nearest tech2 (Marks...) on Sunday, haven't heard yet - is he on holiday perhaps?
Meanwhile, with the caveat that you can't be expected to form conclusions without the stored fuel trim data, follow me as I limp along here: you think this is caused by a manifold leak? How can I check that - I found no cracks, so that leaves the gasket? The other tests I've done are showing too much petrol at startup, right? You are saying this is caused by fuel trim settings applied - by the ecu, based on lambda sensor readings, which set the fuel trims - am I anywhere near getting this?

[terry paget]

You really need to look at the stored fuel trims using a tech 2.

If you get something putting the lambda sensor readings out constantly, such as a manifold leak upstream, the fuel trims will gradually take the mixture out until you have problems starting (lambda sensor is not used at startup, but the fuel trim is still applied).

By manifold upstream do you mean inlet or exhaust manifold?

Opening the throttle wide on start up used to be standard practice for a flooded engine in the old carburettor days, and worked on my Senator. But on a 2.2 with an electronic throttle linkage I wonder if it has any effect.

My son walked in this morning, I asked him how often his 2.2 misbehaves after my changing the upper lambda sensor. He said nine times out of ten I reminded him that when I had it for three days it never did it. He then replied brightly that this morning it ran perfectly first time, and he put this down to his filling the tank last night. So little help there.

I asked him to describe the fault. He said it starts, does not stall, but does not give enough power to go anywhere for half a minute, then it is fine.

[footloose]

I know I'm a bit late coming in here. But I have the same prob and I know what it is with my car. I have a very slight exhaust leak where the front pipe is bolted to the manifold. After a mile or so the engine starts fine and drives fine. I leave it overnight and it all starts again. must get the leak done I suppose it can only get worse.
Just thought i'd mention it. Might help.

[cnj]

    i'm finding this topic very interesting, as my 2.2 z22xe also has a split manifold, I also have been told that they are not good to weld !. I also have a very slightly rough start which clears when the engine has run around two min's and also the manifold has warmed and the crack has closed up sufficiently. I also have the lean exhaust code which is also not present when checked.
  reading what has been written before I don't have the extremely rough starting but it appears that most of the other symptoms are much the same. it may be that the manifold split is causing the lamda sensor to misbehave on both/all other cars, I had initially put my problem down to loose wire, but i'm not so sure now. what I do know is that exhaust manifolds for the z22xe are a bit like rocking horse excrement !!

[RobG]

    i'm finding this topic very interesting, as my 2.2 z22xe also has a split manifold, I also have been told that they are not good to weld !. I also have a very slightly rough start which clears when the engine has run around two min's and also the manifold has warmed and the crack has closed up sufficiently. I also have the lean exhaust code which is also not present when checked.
  reading what has been written before I don't have the extremely rough starting but it appears that most of the other symptoms are much the same. it may be that the manifold split is causing the lamda sensor to misbehave on both/all other cars, I had initially put my problem down to loose wire, but i'm not so sure now. what I do know is that exhaust manifolds for the z22xe are a bit like rocking horse excrement !!

Depends if you`re prepared to buy new
http://www.vauxcentre.co.uk/exhaust/omega-b-1994-2003-22-exhaust-manifold-24420438-485442-79603-.php

[cnj]

don't have the money rob, besides its not causing too may problems at the minute. anyway the rad you very kindly sent nup is working perfectly, many thanks again, Charlie.