Cylinder Misfire

[sway]

Hi can anyone help me i have a is200 03 reg i took it to a garage because engine warning light came on , he put it on diagnostic and it came up with multiple misfires on cylinders 2/3/5 so he decided it needed new pencil coils on all 3 350 quid later its worse than it was before.so he checked compression on all the c ylinders which is fine and all plugs are sparking.He now thinks its something to do with the ecu not giving the correct firing order.

Can anyone offer me any advice as i have run out of money and lexus want £110 p/h to look at it and cant aford that at the moment many thanks.

[steve2006]

You seem to have posted this same question in 3 different forums, keeping it to a single forum may help you get more help and replies.

You will need money whichever way you go I'm afraid.

Things to check are ignition coil trigger pulses, injector pulses, fuel pressure, injector spray patterns,crankshaft sensor pulses and cam sensor pulses.

There are companies which will supply a known working test ECU to loan in order to eliminate a faulty one which is cheaper than buying one to find it is not the problem.

[Guest bigbullhead]

You seem to have posted this same question in 3 different forums, keeping it to a single forum may help you get more help and replies.

You will need money whichever way you go I'm afraid.

Things to check are ignition coil trigger pulses, injector pulses, fuel pressure, injector spray patterns,crankshaft sensor pulses and cam sensor pulses.

There are companies which will supply a known working test ECU to loan in order to eliminate a faulty one which is cheaper than buying one to find it is not the problem.

[steve2006]

You've just quoted me but written nothing?

[ColinBarber]

it could be the ECU but that should be the last thing to expect.

Not impressed with the diagnosis so far. Why would somebody expect 3 coil packs to all fail at the same time. Why didn't he swap them around to see if the fault moves with coil pack or stays with the cylinder?

What are the plugs? Have they been replaced recently? Just because they fire at idle, they could still give problems under load.

What fault codes are being stored in the ECU, and have you got a copy of the freeze frame data when the codes are being generated?