I have a 98 disco1 with 120K. After a run and a short turn off, like hopping in the store, it will start but idle very rich and if you try to drive off it will stumble and misfire. Letting it run a bit before taking off and nursing the throttle to keep the revs up all will clear up. I have cleaned the MAF, changed the thermostat, new fuel temp sensor, and new coolant temp sensor. It will throw P1179 and P1177 which from my research has to do with MAF misbehaving (although I get no MAF codes). If I don't nurse it at the restart, the resulting misfire will throw codes P0301, P1316, and P1313.I drive this vehicle frequently, minimum 15 mile trips and several 300 mile runs in which at refueling I usually keep it running so I can pull away without ****ing someone off. I have had an occasional difficult start , and on one occasion in desperation I removed the MAF connector and it started right away. I have cleaned the connector which lead me to thinking about grounds, I am wondering if anybody knows where the ground is that might affect the MAF, or how about resistance values that I should read at the connector. Sorry about the wordiness!!
Poor idle after warm weather restart
- Thread starter riemer
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JimAttrill
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Maybe you should get a Tdi 
eightinavee
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By the powertrain codes you are quoting I assume this is a US spec truck,can you confirm this and what it has fitted in the way of Oxygen sensors etc.
Hey , maybe I will....Maybe you should get a Tdi
why didn't I think of that?!?!Warm Regards from across the pond.
John
eightinavee
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The p1179 and p1177 codes show the AMFR and FMFR long term settings are at their max negative value indicating a lean mixture.P0301 is misfire on cyl 1 and p1313 relate to misfire issues,P 1313 is on bank A. All this to me points to a LH upstream oxygen sensor failing to switch down from 5 to 0v so the Gems Ecu trys to constantly widen the injector pulse width to get a rich,( 0v ) signal from that sensor.It then gets to the end of its parameters and the engine is getting loads of fuel put into it.
I would try swopping the sensors left to right on the car and see if the codes change to relate to the right bank.If this gives codes for the right bank then that sensor has failed.You may find that the car needs to go on Testbook to reset its adaptions to get back to "middle ground" of its fuel and ignition settings.
I would try swopping the sensors left to right on the car and see if the codes change to relate to the right bank.If this gives codes for the right bank then that sensor has failed.You may find that the car needs to go on Testbook to reset its adaptions to get back to "middle ground" of its fuel and ignition settings.
eightinavee
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Hell, took me nearly 3 mins to look up his P codes and he aint bothered to say if I'm totally wrong or just miles off .
