Vehicle & Technical > Defender

3.5 V8 carb problems

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V8MoneyPit:

--- Quote from: "corrosiverob" ---The problem is that the engine starts on the key but after running and stopping the engine will not start... this will happen maybe 1 out of 10 starts but alway seem to be warm.. the engine is a old 3.5 p6 and i had a electronic ignition installed 2 months ago..... but when it does it i have a spark the way i get it going is by pumping the gas pedal like hell after about 10-15 mins of pumping it slowly starts.
--- End quote ---


Ah, is it fitted with the auto choke carbs?

Pumping the pedal shouldn't do anything with SU's or Strombergs. I would suggest that the 10-15 minute delay is allowing it to cool down so that the choke is not over richening on restart. Will it restart if you simply hold the pedal to the floor and crank it over?

corrosiverob:
it has a man choke but it does seem to start if you keep the pedal down ?

V8MoneyPit:
Do you get a petrol smell when it fails to start? Might be worn float needles and seats.

The fact that holding the pedal down makes it easier to start suggests it is over fuelling at the point it fails to start. If the float needles are not seating properly, it could be flooding the carb/carbs.

I take it the dashpot pistons are moving freely? Assuming SU's. Stick your finger down the throat of the carb and lift the piston right up. It will resist because of the oil (there is oil in them???) but when you let it go it should drop back with a nice clunk as it hits the bottom.

corrosiverob:
I filled them with oil about 3 months ago but i have noticed that there is hardly any oil in them, i am going to have a look at them this weekend and report back. many thanks. rob

Miniman:
Some models of the V8 had a temp sensor which stopped them from starting when to hot.... I know because I had a 5 day journey with one doing the same.....

Is it running over hot....is one of the questions.....
Have you got a manual fan or electric.....
If electric try running with the fans on permently if you have a overide switch. Could even be the thermostat sticking closed causing it to get very hot. Is the rad full of mud. If its got or had aircon your rad is behind the aircon rad so you may not see its full of mud.

All just Ideas for you to try...

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