Fuel System 1 (open Loop) System Fault

[galaxya61]

Have started a new post as the previous post mentioned the car not running when warm which is misleading, I need the car for Christmas so desperate !

 

The car is just about ticking over erratically, as soon as i try to accelerate the engine splutters and dies. The car will not drive at all. There are no obvious leaks, no puddles of oil or water.

 

The car will not start if it is warm.

 

The Scantool shows there are no fault codes... but we have a 'Fuel system 1 (open loop) system fault'.

 

Not sure where to look with this one, have no sensor faults showing, engine RPM, MAF and O2 sensor are functioning.

 

Any advise would be much appreciated.

[sepulchrave]

Open loop fuel system fault suggests the Lambda probe has gone wrong and is overleaning the mixture.

 

You say you've tested the O2 sensor, how exactly?

 

Disconnect the Lambda probe completely and see if its any better.

Edited December 21, 2008 by sepulchrave

[galaxya61]

Thanks for the reply. I checked the output on the scan software, it shows no trip code and have plotted a graph of output which was fluctuating as expected. I changed it earlier in the year as it was showing a fault code on the heater side of the probe. When replaced it cleared. I had a fault with the coil packs as it turns out originally. Not ruling it out though but as the car ran previously with a faulty lambda and no trip codes it would indicate something else??

[seatkid]

I would suspect an air leak on the inlet manifold after the throttle body. Check all pipes are secure and not split.

[galaxya61]

Thanks for your help. Sent to local garage after a struggle with no fault codes showing eventually took the exhaust off and the engine ran. Found that the cat had shattered and a lump had blocked the exhaust completely.

 

New downpipe, cat, gaskets etc running well.

 

Back on the road with a sore wallet !

 

Merry Christmas