RANGE ROVER P38 NEED HELP PLZ!!!!!!!!!

Hi new to the site so be gentle, have a 1997 range rover p38 4.6 v8 with a gems engine rig. recently has developed a bit of a backfire and gets all funny when reving past the 2000 rpms, any help.

Got the range rover in July has been with the family since first reg as was my father who upgraded to the new model and the younger brothers took it on and made a complete mess of the beast, yes it does have a lpg kit fitted but i belive it is a single point sysytem which is no use on this version so I have not used it at all and have had the tank completely emptied and is fitted but not used, as for service I completed a full service in July that includes all the filters, plugs ht leads and fluids, as for the backfire it seems fine doing 30mph but if I put my foot down it stutters at about 2000 rpms but if I accelerate at a normal speed it seems ok. no engine lights and no error codes.

Backfire with no error codes? What are you using to read the codes?

Hi many thanks for quick reply.

the local garage I believe uses the snap computer. first it was a misfire again no error codes so had the spark plugs changed. ht leads to be done next as on order. compression test completed on both banks
right side bank shows 150 banks 1 to 4 and left side bank shows 152 banks 1 to 4.

Need decent diagnostics for Rangerovers; the standard stuff doesn't really do much. Something like Nanocom would be best!

MAF

ukadamwest said:

MAF

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Or air leak.

Where do I start with looking for air leaks???

Got the mechanic replacing the gearbox filter and fluids 2mor.

WASEEM HUSSAIN said:

Where do I start with looking for air leaks???

Got the mechanic replacing the gearbox filter and fluids 2mor.

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You can be sure neither of those is causing it lol.
Why can't the mechanic fix it ? I thought that's what they did ???

sounds like the same situation as my 4.6 thor engine was doing new maf sensor fixed

yeah me too but dont know. is it possible the gearbox is shot??? bearing in mind it changes gear by hand fine, but when reving it stutters. as if looking for the right gear.

right will got on to that then.

I think you need a new 'mechanic'

maf ---- maf ----- maf ----- !!!!!!!!!!!!!

Try and get an original part not a Chinese copy prob bosh

pete12345 said:

Try and get an original part not a Chinese copy prob bosh

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+1

Lucas Maf fitted to gems ,Bosch ones are fitted to the later Thor engine

Hi just to update you guys new lucas maf sensor received and fitted but no change.

the MAF the O2 Sensors and the fuelling works in a loop.

the O2 sensors feed back to the fuel and air mixture, the fuel mixture you cannot change, so if the MAF meters the air with the fuelling and is read by the O2 sensors which feeds back to the fuel air mixture, my first suggestion, MAF would be the obvious choice. next up is the O2 sensors. its difficult without having a diagnostic report see what the air mass readings are or what the O2 sensor readings are.

if at the very basic get yourself an elm327 cable and download some software that can access the readings. best case scenario is to get yourself something like a nanocom. if not.. then change the O2 sensors.

Think I had a prob like it a few years ago am not sure I've fitting a new coil pack cured it because a few things including new Maf were done but someone on here with lot more knowledge than me will be along

I was thinking coil pack plugs doesn't the maf just default in ecu like many other makes of car ...