Hello, when my 1994 pre update V8i 3.9 Disco has been sitting for anymore than 10 minutes to overnight, it takes about a full 15-20 seconds of cranking to get it to start. Though when its hot it will start fine. I once left the car for 7 weeks untouched and it started straight away. I've replaced the Coolant Sensor, checked fuel pressure (good), compression (good) though spark is somewhat weak so I've been told, also sounds like there is a "miss" when its running. Seems to idle ok without "hunting". Would appreciate you help with this issue. I want it to start at first turn of the key.
Sounds like it could be losing fuel pressure to the rail, try turning ignition on for 10s, then off then on then off then try start. That should make sure the pump has pressurised so will see if it is pressure.
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1.let car sit overnight. 2. Start engine, put A/C on high, let it idle for 20-25 minutes, 2, then drive car uninterrupted for 60mph for 10 minutes, 3. slow down to 25 mph for 4 minutes, come to a complete stop with foot on brake let it idle for 2 minutes, 4. drive again at 30 mph for 8 minutes, come to a complete stop let it idle with foot on brake for 3 minutes. 4. Drive at 40 mph (turn off overdrive) for 6 minutes. 5. Drive at 20mph for 3 minutes at a time, each time coming to a complete stop with foot on brake for 2 minutes. Do this 4 times. Let the car cool overnight and repeat entire process. Then check status of systems with a code scanner.
the problem that you're having is caused by a code DTC you need to replace the crankshaft position sensor part number 10456607 I have a 94 GMC 1500 v6 this bulletin is on the Internet GM Technical Bulletin reference number 00 06 04 014 I hope this helps good luck
Low fuel pressure. You need to check the fuel pressure on the first crank and watch it as it is running. Requires a special gauge. If it were just a starting problem I would say it could be a pump relay, but not if it runs rough for 5 min. Might be a dirty filter or problem in the tank.
In the morning, turn key to on position for 5 seconds. Do not crank.Then turn off for 5 seconds. Repeat this about 5 times. Then try to start. If engine starts right up, the fuel pump check valve is bad. Meaning all fuel in fuel line is returning to the tank when car sits overnight. The only fix is to replace fuel pump. If that doesn't work, replace coolant temp. sensor for the computer. About a 12.00 part.
I had a problem with your chat this morning so I am going to answer for you here. You stated that the car runs for ten minutes then quits and will not restart, if you can the first thing I woulddo is take itto a partsstore who rents out a pressure tester and pressuer text your fuel pump, disconnect the rubber hose on the fuel regulater and turn the ingtion switch to the run poastion for two seconds and watch the gauge. The pressure should read 60 PSI if not there is something wrong withthe fuel pump and if it reaches 50 PSI it should hold pressure to 30 psi FOR ONE FULL MINUTE, if it does not then replace the pump, if it holds pressure then remove the fuel pump and replace the fuel sock and fuel filter. let me know if this helps I will be watching for posts on this to contine to troubleshoot this for you.