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  1. No Power After Rebuild - 4.0L GEMs

    Range Rover Mark II / P38
    Hi All, I'm looking for additional suggestions as I continue to troubleshoot 1999 RR 4.0L GEMs - Blew a head gasket on the passenger side (edge of block at cyl5). After completing the rebuild the engine struggles to start, has a rough idle, stalls if you give it gas and let off the throttle...
  2. P38 4.0 gems stuttering..

    Range Rover Mark II / P38
    Hi have need of some help and advice.. the problem I am having is that when driving I get a stutter/missing on part throttle and when asking for a little power (exiting a junction) Have a code reader and have no codes or lights to give any insight as to what is wrong, the only thing that was...
  3. GEMS intake pipe

    Range Rover Mark II / P38
    Gents, The intake pipe of the V8 GEMS has two "boxes" on it, I assume these are there to equalize pulses in the intake, please correct me if I'm wrong.. If I take these boxes of, does it increase throttle response? I thought I better ask before I do something I might regret later on ;)...
  4. Replace 4.6 Thor with a gems engine.

    Range Rover Mark II / P38
    Is it possible to fit a gems engine to a Thor vehicle bearing in mind I know I will have to swop a lot over including all sensors
  5. Bosch seats in GEMs

    Range Rover Mark II / P38
    I have an Alpine White 1996 that I've been working on for a winter vehicle. I've noted that the seats were not nearly as comfortable as my 2000 H+H. Looked and there is a Rhino edition in the junk yard near me with complete interior, any reason why I wouldn't be able to switch the seats and...
  6. V8 GEMS: oil cooler bypass valve and oil cooler lines size

    Range Rover Mark II / P38
    Good evening, i have two doubts about GEMS oil cooling system, hope somebody knows the answer. 1) which is the real task of oil cooler bypass spring valve fitted in timing cover?Is this valve really so sensible to detect oil density, so when oil is cold (thicker) the valve open bypassing oil...
  7. 1996 Gems 4.0 water mistery

    Range Rover Mark II / P38
    Today I took the car (122K miles on the clock) for a 40 mile round trip; Last sunday I did some work around the car and checked the fluids and all levels were OK except for the water that needed 1/2 pint to hit to the "cold" level which is what I have been adding once a year since I have the...
  8. Lumpy and misfiring GEMS 4.6 - urgent

    Range Rover Mark II / P38
    This is a NAS spec 1996 4.6. Canisters and some other 'stuff' had already been removed. Hence they swapped the engine ECU for a normal one. The owner had already changed the sparkplugs and cables, replaced with Champion and Lucas as it should be. We received a P38 with horrible misfires...
  9. GEMS rocker-cover gasket replacement

    Range Rover Mark II / P38
    Heh guys, how simple/ otherwise, is it to replace the rocker cover gaskets on a GEMS? Is it possible to do it with the upper-manifold still on, or does that need to come off? Cheers
  10. GEMS - 5V supply to Throttle Position Sensor has me stumped

    Range Rover Mark II / P38
    My GEMS P38 has been having idle problems off and on. I let it sit fo 3 or 4 months and now it won't idle at all. Started to do some basic diagnosis - the nanocom says TPS voltage is only .02v. Basically 0. So I back probe the TPS connector, and realize it's not getting 5V at the connector...
  11. VincentRange says Hi! p38a 1995 4.0 SE gems NAS

    New Member Introductions
    Hello all, After lurking as a guest for while, I'd really like to join you and share some experiences with my Range Rover p38a. Since a couple of months I own a white p38a. North American Specs. It's been on the road in Canada, Switserland and now The Netherlands. Thank you all for sharing so...
  12. Ecu free In GEMS P38

    Range Rover Mark II / P38
    Dears Good day All, I am new here this the first post to me. Is there a way how to make the ECU free or open, so i can installed in any P38 GEMS with out synchronize with the BECM. I have heard some thing like that. I have both NANOCOM & Lynx tools. The idea is i am the only one in my area has...
  13. P38 4.6 Gems hot starting issue

    Range Rover Mark II / P38
    Hi everyone, just joined up, having trouble with my old P38 4.6 (Gems). I can start it every time on the button first turn when the engine temperature is either cold or just warming up. However , when the engine has reached full running temperature and is switched off for a short while, it will...
  14. fitting footwell lights in SE spec (98 GEMS)

    Range Rover Mark II / P38
    Hi @all, after a hard time without a proper car, I came back to RR, again with a P38a. It´s a 98, VIN WA, 4.0 SE. The car is European Spec, LHD, if that matters. My question is, as the car has the wholes for the footwell lights left and right and rear puddle lights, can these be installed plug...
  15. gems vs thor temp gauge

    Range Rover Mark II / P38
    hi guys, Are the temp gauges calibrated the same between the two variants or will an early cluster read low in a thor car? I bought a thor 4.6 with the heads off. have it running and driving now, but the temp gauge reaches only about a quarter of the way up. I cross checked with a cluster from...
  16. Misc bolt 98 4.6 GEMS

    Range Rover Mark II / P38
    Something missing? Don't think LR would just have a bolt hanging out of the block by itself. And looking on the net cant find a good pic.
  17. Instrument Cluster and Radio Not Working - 97 GEMS

    Range Rover Mark II / P38
    I just changed over some dash trim pieces necessitating removal of the switch panel, radio and HVAC. After putting it all back together I find that the instrument cluster and radio no longer work. At the same time the HVAC lcd screen pulses whether the ignition is on ACC or the vehicle is...
  18. Bosch radiator in GEMS?

    Range Rover Mark II / P38
    In the process of switching out my radiator on my 98 p38 4.6 gems engine. I was at the junkyard and I came across a 99 RR 4.0 with the Bosch engine. I seen the radiator and thought WOOHOO found a radiator well I take it out and all get home about to rip my old rad out cuz as you can see it is...
  19. P38 '99 4.0 gems high revs drinking petrol

    Range Rover Mark II / P38
    Recently acquired and started over revving (2500rpm) in neutral and park. It's not throwing up any error codes but diagnostics show outside temp as -39. Managed to get hold of a new air temp sensor and replaced but still showing same temp. It's only doing about 10 to the gallon. Any ideas? Thanks
  20. Fuel Line Leak - 97 GEMS

    Range Rover Mark II / P38
    Happy New Year! Apologies for the duplicate thread, but can’t seem to access the original thread to add the photo. I have a fuel line leak inside the engine bay on my ‘97 GEMS. Photo is attached, but it’s the line affixed to the firewall and includes a regulator attached at the connection...
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