the glow plugs are located inside the the valve covers on the engine' the wire harness goes thru the cover gaskets.so this is a major job.if you break a gasket while removing, they cost about $70 , each to replace. you also need special tools to remove glow plugs. it is much easier and safer to take the truck to a reputable diesel mechanic.

France

this sounds alot like a turbo failure, although there could well be a leak in the pipes leading from the turbo to the intercooler, or from the intercooler to the inlet manifold.

also check the intercooler for leaks.

or it is the vacuum pipe that operates the waste gate on the turbo, or a seized waste gate.

my experience is that the original 405 carburetor when functioning well is more economical than fitting a 504 or a 404 carb.

the whole 405 carb unit must be functioning well for it to offer good fuel consumption. with it i manage 30mpg in city drive and up to 39mpg highway. the 504 and 404 carbs cannot achieve that, the best they can do is a max of 35 mpg given that the engine and the car in general is functioning well.

For plugs that can be adjusted the NGK catalogue states 0.8mm for all engine sizes of 405.

probably, abs eror light.because my citroen bx has got same type light.

hi from turkey

That light is the "water in diesel fuel" light. Ive had it on in my 405 diesel too. Does it look like a bucket with water in it with lines on the side? yellow?

The carb has an automatic choke, this is fed with coolant through thin pipes to the carb to heat it up and so switch it off when the engine warms up. Check the pipes are not blocked, and check that the thermostat on the choke unit has not failed. If it is a late car with fuel injection, check the water temp sensor. Good luck...............