[tripingeorge3]

Just purchased a 2003 RR hse. Always wanted one and finally made jump. I purchased it not running though. It cranks but wont start. I have researched for a long time and am still in same situation. The ignition turns, ive checked all fuses, checked power at fuses and swapped relays. I can jump the fuel pump at relay and get great pressure. I have also changed the crank sensor and checked its wiring. Also have checked the relay for the ignition coils and its putting power to the coils but no visible spark. Pulled a coil and dont see it spark. Ive done that test on other cars before. Ive even pulled a plug and did spark test with my silverado and plug got spark. Doesnt seem like injectors are firing either. I have tried starter fluid and it seems to attempt to start. Afterwards i tried pouring gas into the intake but then no attempts to run at all. I have checked for power to coils and have 12v to 15 and 4a. No available engine codes. Had p1844 initially. Wasnt believing it was a ecu sync issue cause ecu energizes ignition coil relay. I get .62 ohms on new crank sensor. Ive tried tapping into crank sensor input wiring at ecu to read volts(black and yellow wire). Soon as i turn igition on it reads 4.3 ac volts not cranking which doesnt seem right being that ckp creates its own voltage. Maybe my understanding is wrong. Im out of ideas. Help please. Would like to get it running to get to my coolant leak issue at trans cooler. Leaks right out at hose connection. Dont know if it has a fail safe for no coolant so i figured id mention. Oh and red security light isnt on either but works. Tried arming/disarming with key in door.

 

[tripingeorge3]

No real previous history. Previous owner owner said engine was changed and claimed it was running but wouldn't start one day. He said nobody could figure it out. Figured I'd take a chance.

 

[tripingeorge3]

Ok. Well check compression next as i only checked 2 cylinders checking for spark.

 

[tripingeorge3]

I didnt do a compression test on all the cylinders cause i figured i might have caused a cylinder was done. I had added oil in each cylinder so measurement wouldn't have been correct. I went through everything electrically and found no shorts or opens in actual wiring. Found ecm not grounding fuel pump relay. Grounding myself energized pump. I had got tired of the normal common sense troubleshooting and order a icarsoft i930 scanner for $113 on amazon. Beforehand i tried finding a shop to do the resync. They kept trying to tell me something else had to be wrong. One even told me he never heard of resyncing and had to troubleshoot. Actual range rover shop. No, i did that already. Even told them what i troubleshot. Not paying extra for you to do what i already took my time doing. Anyhow, my scanner came an stated that my key is good but vehicle is immobilized. Called back and now he's willing to do the sync. Only other bad part is that they want me to take it off my car trailer. Will keep you posted.

 

[tripingeorge3]

Auto correct got me. Was supposed to say i thought i may have caused a cylinder wash down.

 

[tripingeorge3]

Got the news. Range rover shop said that the previous owner put in a junkyard ecu and that's why its not starting. They have a parts one with all matching computers and are going to switch the matching chip to my key. Although i couldve sworn that a used computer could be programmed to match.

 

[tripingeorge3]

Good news! It now runs and sounds very good. Now on to the other issues. Lol. Thanks for everybody's help. Guess for towing purposes one if the driveshaft was unbolted so it wont move which made me unable to load it on my trailer. They are going to put it on lift and reconnecy it for me tomorrow.