Timbo
Member
- Location
- Gods County
It doest seem to be using coolant or very little if so however I got round to taking the pipe off the end of the egr cooler today and it wasn't blocked up and you could see the fins clear enough, granted abit black but nothing gungie, the was a slight bit of dampness in the Botton and in the pipe removed that did smell of coolant
I was also informed by the local dealer to measure the flow from the injector return pipe down near the fuel pump and was told there shouldn't be any more than 100ml over 60 seconds and it put out 135ml so not sky high but still more than specs of a dealer, if that helps to anyones knowledge, as stated surly it would put up a code if it was returning too much and a loss of pressure in rail
they also said they would put it onto live data and see if any injectors are playing up once the fault had occurred
it doesn't seem to matter which job it is doing it just starts playing up after a few hours, where about is the PCM found on this engine?
Ok so, you do have a slight leak in your EGR cooler. This is only going to get worse, but it will not be causing your misfiring issue. That needs sorting first, but I would suggest you have a Derv Dr EGR delete and remap, and remove the EGR cooler and pipework entirely.
PCM on these is above the engine on the hood support- just where it will heat soak after afew hours use...Try the freeze spray... Has the dealer got a similar tractor (7530) or test ECU that you can borrow and flash for your tractors build to try it? I know David King wont touch these PCM's at the moment.
135ml of leak back - this is borderline on a hot engine at 1500rpm - how did you test it ? Leak-back will only increase as fuel temperatures increase. But you have no low fuel pressure warning, so at the moment the HP pump is keeping up. IF one injector leaking back excessively will drop power on one cylinder and can often show itself as abit of a rough idle. The difficulty is you cannot check each injector individually without much agro and oil splashing about everywhere, and I don't like changing the set where one is worn.
With the JD advisor you can do a power balance test where each injector is shut off individually and its cylinder contribution recorded on a graph. Again this would be after you have solved the misfire cause ...