I fitted the bosch BIM024 (Brand new Genuine Bosch) to my 93 RRC on the weekend replacing the Lucas system which seemed to be operating OK. Now there is a huge hesitation/surge (like running out of fuel) when between 1800 and 2000 RPM when transitioning between light pedal and 1/4 pedal while driving on Petrol. Petrol was fine before the mod and when on LPG there is no problems. On both fuels it does feel better to drive.
When I did this mod I was out of LPG so as soon as I hit the road the hesitation/surge was apparent. I drove to the servo and filled the LPG tank and switched to LPG. The hesitation/surge disappeared until I was on petrol again.
As the hesitation/surge is RPM based I thought that the BIM024 module might be getting some RFI induced from the alternator which was stopping the ECU from fueling the engine properly. I re routed the wires from the Dizzy to the BIM024 module and it has improved a lot, but the hesitation/surge is still there. When the engine is cold the hesitation/surge is almost not noticeable, but once up to temp it is back. It seems that under higher fuelling (cold engine, higher RPM or more throttle) the hesitation disappears.
Normally I would just think that the problem was ECU or fuel system, but since the problem occurred after the mod and re routing the dizzy wires improved things I think it must be the mod.
Is there a particular location that is recommended to route the dizzy pick up wires? Should the dizzy pick up wires be of a braided shield type? Any other suggestions?
Thanks for any help.
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