Discussion
Hi all. Bit of help please.
My chim 400 runs great just what’s occurred recently. On the motorway about 70 or 80mph and then I floor the throttle I will get a gradual speed increase and after 2-3 seconds the real power kicks in. It’s the same in all gears when cruising. 30 mph in 3rd and then throttle hard I don’t get much power until 2-3 seconds later. Incidentally I have just had plenum re-sealed not sure if this has anything to do with it.
Any ideas thanks
My chim 400 runs great just what’s occurred recently. On the motorway about 70 or 80mph and then I floor the throttle I will get a gradual speed increase and after 2-3 seconds the real power kicks in. It’s the same in all gears when cruising. 30 mph in 3rd and then throttle hard I don’t get much power until 2-3 seconds later. Incidentally I have just had plenum re-sealed not sure if this has anything to do with it.
Any ideas thanks
Has the throttle pot been reconnected?
For the most part an EFI system uses air flow or manifold pressure to control fuelling. However neither of these handle acceleration very well so the ECU looks for a rapid change in throttle position to then give an extra shot of fuel to get things under way.
Steve
For the most part an EFI system uses air flow or manifold pressure to control fuelling. However neither of these handle acceleration very well so the ECU looks for a rapid change in throttle position to then give an extra shot of fuel to get things under way.
Steve
This sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.
1st thing to try is to remove the fuel filler cap and then flick the ignition on whilst listening for the brief ‘buzz’ of the pump
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injector rail (should usually be around 3Bar / 45psi +) and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
1st thing to try is to remove the fuel filler cap and then flick the ignition on whilst listening for the brief ‘buzz’ of the pump
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injector rail (should usually be around 3Bar / 45psi +) and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
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