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FAULTY ECU Caused by Garage!


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I have just had a day of sorting out peolple who are causing me grief at the moment! One of these is the garage ( RS Fabrications in Banbury) that fitted the one off Stainless exhaust system to my Sport 350.

They have invoiced me

Edited by MGFCrasher
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...... they have invoiced me

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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I had a similar sounding fault,the garage I bought my v8 from are expected to have boosted battery with poles reversed.I had similar faults until the car would not start.Sinclairs(who I cant recommend highly enough)diagnosed this,which agreed with my mechanics(Mowatt Motor engineers,again highly recommended)had already suggested,as broken ECU.New ECU fitted and now running very well.

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I had hiflow cats made recently and now only have two o2 sensors which seems to work fine although I have had three random times that the car has started and then just died, this happens three times and then all is fine and it idles. I have hooked up the PC to the car and no fault code shows.

It is my understanding that only Federal cars that have software that uses all four sensors. Without them the faults you mention could appear I believe.

I don't know how much they cost, the biggest problem is removing them without breaking the cat pipe. :lol:


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My car (UK) definitely only uses the front 2 O2 sensors - the back 2 aren't fitted anymore - no fault codes or anything. Without the front pair working properly the ECU will never enter the closed loop stage and run the engine correctly. In open loop (while the O2 sensors are getting hot) the ECU is guessing about the fuel mix - it'll probably run very odd after a while.

You can check the operation of the O2 sensors with a volt meter or better still a scope and you should get a square wave as it switchs rich to weak. They could be knackered or depending what you have done to the exhaust system and positioning of the sensors they may not be getting hot enough to operate.

Don't blame the ECU until you have these sensors working OK. You can replace them with universal ones for 30ish quid - need to sort the wires out to the loom connector lotus used.

The TECH1 test tool will show if the car enters closed loop operation and the values from the O2 sensors.

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