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What should a 4.6 V8 idle at and anyone know what the TPS value at 3,000 revs (stationary) should be? Cheers Bill

Sorry Stu forgot to say all B+H had to say re the engine parts used are that they are all either original parts or better. Just a point it was running closed loop when they handed the motor over after fitting. Right I need to check further but it appears even with the 02 sensors disconnected...

Think it's £55 for certification of a system and then it's placed on the register. UKLPG Vehicle Register

Did a short run today with the front 02 sensors disconnected, so I am assuming running the default fuel map and although she felt a bit livelier I am not convinced she is running any better. One thing I noticed was when I switched to gas, the hesitation took a while to become apparent but its...

Well not sure what this says, but disconnected the front 02 sensors and instead of showing Open Loop Fault, she is now showing as just Open Loop. The rear lambdas went rich at 80 degrees or thereabouts again.

Still can't find any wiring problems, but may have found another straw to clutch at, cats! I have been mainly concentrating on the pre-cat 02 sensor readings as they control the fuelling, but having looked at the post cat sensors, I note that instead of reading around .45v as they should they...

So do I and I have a 110! One advantage for me is that the Discovery doesn't seem to develop a whine from the passenger seat areas:D

Well if I wasn't confused before I am now. Just ran the diagnostics again, this time she is showing constant high voltage - rich, doubled checked this by removing the oil filler cap, went to from >0.8 to >0.1 as you would expect by adding more air, the only thing I can see that is different is...

More random thoughts, the 02 sensors are showing mostly lean running, ie low voltage = too much Oxygen in the exhaust fumes, now if it was too little fuel one would assume the car would lack power? Which it doesn't, so could I still be looking for an air leak that effects both banks, if so what...

Had a day off from it today, had family up from deepest darkest Essex. Checked the Fuse box already tis fine, fuses can melt from continuous operation at there limits. That was my plan Stu, not petrol as far as I am aware I mostly use Texaco if filling up with gas or Esso if petrol only. Had...

Question the O2 sensors are heated. And I assume the wire from the fuse 2 supplies the voltage to the heaters? Therefore if this compromised then the O2 sensors won't heat and therefore won't work properly?

Will investigate that, Stu. The gas system wiring hasn't been altered since before the engine was replaced as far as I am aware but will try it. Since playing around with the wiring and replacing the fuse, I seem to be getting a bit more action from the 02 sensors, not right and gives up after...

Unless of course you get so desperate you miss something, ignore the joined wires:doh:

Split the wires and now have P0340 Camshaft Position Sensor Circuit Malfunction:confused: which according to the wiring diagram shouldn't be affected by that wire!

Very odd, it appears the someone has joined the wire that feeds the MAF to the Wire that feeds the O2 sensors, both wires have been stripped back without cutting and crimped together and taped with insulating tape! It seems to serve no purpose to me.

Correct fuse, put a new one and ran the motor till up to temperature fuse didn't seem to get warm, but that may be because whatever caused the problem has shorted right out. Even if they have hacked the O2 lines, it would have been like it before we replaced the engine and this fault didn't...

Houston I think we may have a problem. The remains of Fuse 2 that feeds; Purge Control Valve, CMP Sensor, MAF sensor and 02 sensors. But it's still intact! What on earth could do this without blowing it? Time to get the wiring diagrams out:(

Quick round-up particularly for anyone new to the thread: Vehicle has a fully reconditioned 4.6 long engine fitted running on 4.0 map. Symptoms: Fault codes. Only a non relevant SAI code P0304. Fuel consumption increased. Hesitancy between 1250-2000 revs. Won't go closed loop. O2...

No offence taken Stu. Simon the guy that fitted it is away at the moment (bereavement) so no answers on the mechanical side. I wouldn't mind you having a look at it, send me a pm with a quote based on meeting up in Shrewsbury.

Yes they are O2 voltages, the MAF flow only changed marginaly. Sorry in that previous post it should have been 0.859, so they will switch.