farmer_joe Posted January 4, 2014 Share Posted January 4, 2014 Hi Chaps, every now and then when i start my 90 it fires up fine, and then after a few seconds starts to run really rough with lots of white smoke and then stall. if i keep my foot on the throttle a bit it stutters and tries to stall but eventually the revs pick up and its fine! if you let it stall out it starts and runs fine on the next turn of the key! it doesn't seem to matter if the weather has been hot or cold and like i say it only does it occasionally not all the time. its an early 90 with a 200tdi disco engine. its done it ever since ive owned it. in which time its had all the belts and filters changed and pretty much the whole engine rebuilt! any ideas? ive not been able to fathom it myself. cheers in advance, Joe Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted January 4, 2014 Share Posted January 4, 2014 Pin hole in fuel pipe between tank and lift pump, allowing fuel to flow back to the tank,creating an air pocket in the pipe, you won't see much in the way of signs of a leak as the pipe isn't pressurized... Quote Link to comment Share on other sites More sharing options...
ejparrott Posted January 4, 2014 Share Posted January 4, 2014 Air in the fuel, almost certainly. Check the filter is on tight, might be worth changing that too. Quote Link to comment Share on other sites More sharing options...
farmer_joe Posted January 4, 2014 Author Share Posted January 4, 2014 i did suspect that fuel could be leaking back down the fuel line, but would it not do it all the time if this where the case? i'll double check the fuel filter when i next go to the truck, it was replaced fairly recently so shouldn't really need replacing and i'm pretty sure its tight! you never know though. could air be getting in there any other way? Quote Link to comment Share on other sites More sharing options...
western Posted January 4, 2014 Share Posted January 4, 2014 what state are the spill return hoses between the injectors, these can let air in as well if perished Quote Link to comment Share on other sites More sharing options...
farmer_joe Posted January 4, 2014 Author Share Posted January 4, 2014 Thanks Western, I'll check them as well. i just cant see why it only does it sometimes and not all the time! Quote Link to comment Share on other sites More sharing options...
xychix Posted January 7, 2014 Share Posted January 7, 2014 make sure the fuel return is from the highest (from ground level) cylinder. In a ford transit MK5 this was done from the cilinder closest to firewall, over time when the van lowers in the rear because of all the heavy loads some air can get trapped in the fuel return lines near the most front (and highest) cylinder. Just something to keep in mind if in the end there seems to be no airleaks at all. A bubble in there (after fuelfilter change) can live there for a LONG time. Quote Link to comment Share on other sites More sharing options...
Tanuki Posted January 7, 2014 Share Posted January 7, 2014 I'd also check the fuel-filter for the presence of water: if you get a smidgin of suspended water in your diesel the paper filter-element can become water-saturated in non-obvious ways and while the engine will run OK under load once started, the water can settle-out in the pipes between the injection-pump and the injectors when the engine's stopped - if the beads of moisture then roll forwards down the pump-to-injector pipes they can settle in the injector-pintles and the first few squirts of injection can be an emulsion of diesel and water, which doesn't burn cleanly. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.