Racing bmc 1.8

[Davespirit]

Can anyone help.i have a bmc 1.8 after half an hour running it starts racing at 20 second intervals the racing last for maybe 3 seconds then runs fine then 20 seconds later it races for 3 seconds and so on.any ideas.

[Phil Ambrose]

Fuel starvation?

Phil

[bizzard]

Anorexia Nervosa.

[Tony Brooks]

When a hydraulically governed DPA injector pump suffers a drop in internal pressure it is very common for the engine to rev up. The 1.8 normally has such an injector pump so as Phil says the first thing to check is fro a lack of fuel. Either a problem with the supply ranging from blockages, lift pump problems, tap turned off etc. to air leaking into the system.

 

Make sure the fuel tap(s) are fully turned on, check your filters & any water traps, try blowing back down the supply pipe into the tank as first steps. Best also make sure the stop lever on the pump is fully in the run position as well.

[cereal tiller]

Can anyone help.i have a bmc 1.8 after half an hour running it starts racing at 20 second intervals the racing last for maybe 3 seconds then runs fine then 20 seconds later it races for 3 seconds and so on.any ideas.

Check the fuel Tank breather

 

CT

[Slim]

I'd vote for air in the system

 

 

Frank

[Mikexx]

I'd vote for air in the system

 

 

Possible but I would also have expected uneven running.

 

I would be temped to crack open the banjo holding the leak-off pipe on the fuel filter and bleed any air that might have accumulated on what is the filter return / input side.

 

If there is no air there, then I don't believe it's an "air" problem.

[Davespirit]

Have just run for hour and 15mins after replacing fuel filter and alls good so far.thanks for everyones imput.

[bizzard]

Racing BMC 1.8? I reckon Mc Laren F1 cars are using them at the moment and not Honda'.

[Tony Brooks]

 

Have just run for hour and 15mins after replacing fuel filter and alls good so far.thanks for everyones imput.

 

For goodness sake inspect whatever the fuel filter trapped. If it looks clean then it was probably a mis-fitted rubber seal. If there is a lot of cloudy fuel, water or gritty dirt then the bottom of the tank needs cleaning (at the very leasts) if you find slime and gel like stuff its bug so the fuel tank plus fuel needs urgent cleaning and a biocide used.

 

 

[Dutchie]

I had the same sort of same problem a few years ago only different was the interval from this fault , with mine T90 it came sometimes after an hour , solved the problem with removing the banjo bolt from the fuel filter return line , in the banjo is a very small whole which was blocked with some dirt , clean it with some petrol and blew the dirt out with some air.

Problem was over and never came back .