Recommendation for LUCAS engine ECU overhaul - Chim 400???

[kramv8]

Hi to all fellow Pistonheaders and TVR folk alike!

I have a Chim 400HC suffering from a chronic overfuelling issue on one bank only (r/h bank). It's running the Lucas Hotwire system, as employed by Rangy classics & Disco's of the era, running 3.9EFIs. I'm close to the point of giving up as the following works have already been completed trying to solve the running issue:

- replaced plugs & leads
- replaced dizzy cap
- replaced rotor arm
- replaced AFM (with genuine new item)
- replaced ECU coolant temp sensor
- had all wiring from fuse box to ECU and injectors checked, tested and repaired
- known good injectors fitted - still overfuelling
- lambdas tested - all good

We've reached a stage now where the car will run pretty well from cold and then after 10mins or so, the hydrocarbons go through the roof, unburnt fuel pours out the exhausts and it runs very poorly.

I replaced the ECU with a used item which was sold by a TVR breaker as known good. The last thing me and my mechanic can now think, is that both ECUs have the same fault, as surely this can be the only component capable of sending the command to dump a load of unrequired fuel into one bank only?

Please can any fellow PHers, or TVR owners recommend a spot-on company who can test and repair (if required) my car's ECU.

This is driving me mad, and I've spent a lot of money and workshop time to arrive no further forward!!!

Thanks in advance for any help, or pointers.

[kramv8]

Thanks for all of your feedback and advice.

Re the injectors, we've swapped a full (known good set) from another Chim 400 (which runs perfectly) and my car then runs with the same fault. Therefore, I don't think the issue lies with the injectors. Something is giving them the instruction to pour loads of fuel into one bank.

The earth strap is a good call and I will check that.

The full loom has been checked and tested.

I to believe it's unlikely for two ECUs to have the same fault however, I'm really running out of options!

[kramv8]

Thanks again for all your combined help.

I've decided to purchase a Roverguage kit from Blitzracing - crossing fingers and toes that this will provide the info we need and lead us to a solution.

[kramv8]

Thanks for everybody's help & input, particularly Mark (Blitzracing).

The Chimaera is now (fingers/toes crossed) fixed. It turned out that the fault was being caused by a faulty injector. Having fitted a set of freshly refurbished items, it is now running A1. Very annoying as we swapped the original set round with 8 from a car running fine and the same problem persisted.

Anyhoo, all's good now.

Thanks again for everyone's input.

[kramv8]

fatboychim said:

You also may wish to read this thread, it may be relevant.


http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Thank you very much for this link.