dodeer Posted February 25, 2014 Report Share Posted February 25, 2014 Jeep Grand Cherokee 2.7 CRD Let pre heat light go out and turn key , it starts and cuts out after 1 second, it then takes 30 seconds of turning the engine over to start. Once started and run for 5+ mins it starts perfectly for the rest of the day. Any thoughts? Quote Link to comment Share on other sites More sharing options...
ditchman Posted February 25, 2014 Report Share Posted February 25, 2014 have you got your foot on the throttle ? if so dont touch the throttle at all as when cold it automatically pulls the fuel rack back into excess fuel position...if you put your foot on the gas it will cut it out........... Quote Link to comment Share on other sites More sharing options...
Brad93 Posted February 25, 2014 Report Share Posted February 25, 2014 Injectors possibly? Quote Link to comment Share on other sites More sharing options...
dodeer Posted February 25, 2014 Author Report Share Posted February 25, 2014 Injectors have been replaced last year. No foot on throttle when starting. Quote Link to comment Share on other sites More sharing options...
ditchman Posted February 25, 2014 Report Share Posted February 25, 2014 sounds a bit like its not getting its fuel quick enough, until the pump has been lifted by the cam for a while...............is an electric or mechanical lift pump ? Quote Link to comment Share on other sites More sharing options...
Twistedsanity Posted February 25, 2014 Report Share Posted February 25, 2014 Air leak in injectors ? Quote Link to comment Share on other sites More sharing options...
Brad93 Posted February 25, 2014 Report Share Posted February 25, 2014 Have you had the compression checked? Either digitally or through the injector/glow plug holes? Any DTCs or lights on the dash. Sounds like it's not getting enough fuel or air. When was it last serviced properly? I.e. Air filter and fuel filter? Quote Link to comment Share on other sites More sharing options...
subsonicnat Posted February 25, 2014 Report Share Posted February 25, 2014 air in the leak off pipes, its going backwards, to the tank, check the fuel filler is there an inrush of air or does it not have a vacuum... Quote Link to comment Share on other sites More sharing options...
picardy Posted February 25, 2014 Report Share Posted February 25, 2014 I'd say one of your heater plugs are faulty mate . Quote Link to comment Share on other sites More sharing options...
Cannon Posted February 25, 2014 Report Share Posted February 25, 2014 Also sounds like glow plugs. Some diesels will start easily even if they're faulty, but some will also struggle when the engine block is cold. Could be the reason it starts easily after it's warmed up a bit. Quote Link to comment Share on other sites More sharing options...
dodeer Posted February 25, 2014 Author Report Share Posted February 25, 2014 Thanks chaps. Filters and fluids were changed 3 weeks ago. Quote Link to comment Share on other sites More sharing options...
alastair0903 Posted February 25, 2014 Report Share Posted February 25, 2014 Well I would suggest that you make sure the fuel filter housing has been refitted properly, as it could well be letting air into the fuel system ? Quote Link to comment Share on other sites More sharing options...
davecooper1 Posted February 25, 2014 Report Share Posted February 25, 2014 Dodgy heater plug, had same problem with my Ranger....changed the heater plugs, never missed a beat since. Quote Link to comment Share on other sites More sharing options...
al4x Posted February 25, 2014 Report Share Posted February 25, 2014 do you get lots of grey / white smoke when it does go? Quote Link to comment Share on other sites More sharing options...
dodeer Posted February 25, 2014 Author Report Share Posted February 25, 2014 Yes Quote Link to comment Share on other sites More sharing options...
NIGHT SEARCHER Posted February 26, 2014 Report Share Posted February 26, 2014 Well I would suggest that you make sure the fuel filter housing has been refitted properly, as it could well be letting air into the fuel system ? Plus + 1. Re fit the fuel filler it`s drawing air in over night. It`s Called ( Diesel fall back ). Smear some grease round the top of the fuel filter to help seat and seal on re-fit. Quote Link to comment Share on other sites More sharing options...
dodeer Posted February 26, 2014 Author Report Share Posted February 26, 2014 Thanks, will get that done today Quote Link to comment Share on other sites More sharing options...
al4x Posted February 26, 2014 Report Share Posted February 26, 2014 Yes Glow plugs, just take them out and test I'd bet you have two or more failed, how many depends on how good your compression is. My fourtrak wouldn't start if one was down, my l200 was ok with 3 gone just a little slow. Quote Link to comment Share on other sites More sharing options...
mossy835 Posted February 28, 2014 Report Share Posted February 28, 2014 i would say glow plugs,thats what my van was doing, Quote Link to comment Share on other sites More sharing options...
Paul223 Posted March 1, 2014 Report Share Posted March 1, 2014 I'd eat my hat if it turned out to be glow plugs My thoughts would be...... Air in the fuel system, most likely at the fuel filter or delivery pump on the end of the head. Why? Because it fires and runs for a second, therefore compression, injectors, high pressure fuel pump and a dozen sensors are working fine, and most likely air in the fuel system causes the high pressure pump to reduce it's out put, fuel rail pressure drops and the engine cuts out, continued cranking bleeds the air out and it fires again no doubt chucking out smoke until it runs nicely on all 5 Glow plugs will only make any real difference in this engine when the temperature drops below 5deg C, and if Jeep have taken on board all the Merc systems the with one failed glow plug the glow plug light would briefly blink once after firing up, twice for two failed and so on. Quote Link to comment Share on other sites More sharing options...
delburt0 Posted March 1, 2014 Report Share Posted March 1, 2014 do you get lots of grey / white smoke when it does go?= unburnt fuel (heater plugs not getting hot enough) before throwing money at it just check the heater plug relay and heater plugs , any half competent mechanic should be able to manage this.. Quote Link to comment Share on other sites More sharing options...
Paul223 Posted March 1, 2014 Report Share Posted March 1, 2014 The same as any mechanic worth his salt would realise that an engine which fires and runs sweet for a second before cutting out can't have glow plug issues! If it did then why would it fire and run in the first place only to cut out afterwards? Quote Link to comment Share on other sites More sharing options...
delburt0 Posted March 1, 2014 Report Share Posted March 1, 2014 (edited) After initial combustion (1second running) if the glow plug or plugs are failing as could be the relay not keeping the juice running to them for the correct period of time, you could get the warm heater plug drowning in diesel, "giving the white smoke scenario".. Of unburnt fuel. (My theory anyway ) This would also explain starting after cranking over as the plugs are operating under there running currant and not starting currant, and obviously the car will restart all-day as it takes hours to the engine and fuel in the injectors to go cold..hence only doing it on a morning. Edited March 1, 2014 by delburt0 Quote Link to comment Share on other sites More sharing options...
Paul223 Posted March 1, 2014 Report Share Posted March 1, 2014 Running current & starting current? Nah If there was an issue it'd show on pre heat as well as post heat, plus the glow plug light would blink to indicate ( it's a merc engine and running package) Quote Link to comment Share on other sites More sharing options...
al4x Posted March 1, 2014 Report Share Posted March 1, 2014 I missed the started briefly, that does as Paul says eliminate glow plugs and indicate a fuel issue Quote Link to comment Share on other sites More sharing options...
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