P4trol
30th December 2013, 08:08 PM
A bit of a long read.
The vehicle: 99 GU series 1, RD2.8t, white.
Problem: The water guage starts creeping up at about 105km/h. It is worse in 4th.
Recently I have replaced the MAF sensor, and it fixes the sluggish problem I had. The oil leak (unrelated, from the front of the sump, where 2 or 3 sump bolts are stripped) does not occur after the MAF change and also the intercooler has the oil cleaned out (and importantly the charge air temp sensor). Belts have been changed, new radiator hoses, water pump, and fluid. Fixed the problem with coolant not being sucked back from the overflow tank. New coolant.
The acceleration is welcome since the change. I can't get the water temperature to move until it hits 105/110km/h on the flat. Ambient temperatures 36-38 degrees. Ordinarily the temperature needle doesn't move from the 11 o'clock position, just to the left of the symbol on the water temp guage. It doesn't come down that quickly when you take your foot off. I realise that it is operating in adverse temperatures, but I believe the cooling should be able to keep up. When it is doing these speeds/temps, you can push your foot further, and it actually accelerates.
It hasn't done this before. I have my own theories, and am still ironing out things from the previous owner.
I believe it has been bled properly.
The injector pump - it is mechanical? Would it be likely to inject too much fuel at high rpm? (and how much would a brand new - off the shelf - one need tuning before placing in the engine?
Coolant concentration: I bought two bottles because I emptied all the coolant. The concentration would be up around 70-80%. Would the greater than recommended concentration have an adverse effect?
Apart from the normal fluids change and IP calibration, what further can be done (without a chip) to 'tune up' the engine?
Thoughts? Opinions?
The vehicle: 99 GU series 1, RD2.8t, white.
Problem: The water guage starts creeping up at about 105km/h. It is worse in 4th.
Recently I have replaced the MAF sensor, and it fixes the sluggish problem I had. The oil leak (unrelated, from the front of the sump, where 2 or 3 sump bolts are stripped) does not occur after the MAF change and also the intercooler has the oil cleaned out (and importantly the charge air temp sensor). Belts have been changed, new radiator hoses, water pump, and fluid. Fixed the problem with coolant not being sucked back from the overflow tank. New coolant.
The acceleration is welcome since the change. I can't get the water temperature to move until it hits 105/110km/h on the flat. Ambient temperatures 36-38 degrees. Ordinarily the temperature needle doesn't move from the 11 o'clock position, just to the left of the symbol on the water temp guage. It doesn't come down that quickly when you take your foot off. I realise that it is operating in adverse temperatures, but I believe the cooling should be able to keep up. When it is doing these speeds/temps, you can push your foot further, and it actually accelerates.
It hasn't done this before. I have my own theories, and am still ironing out things from the previous owner.
I believe it has been bled properly.
The injector pump - it is mechanical? Would it be likely to inject too much fuel at high rpm? (and how much would a brand new - off the shelf - one need tuning before placing in the engine?
Coolant concentration: I bought two bottles because I emptied all the coolant. The concentration would be up around 70-80%. Would the greater than recommended concentration have an adverse effect?
Apart from the normal fluids change and IP calibration, what further can be done (without a chip) to 'tune up' the engine?
Thoughts? Opinions?