Diesel

>forgive me posting here but need advice this evening before a return garage visit at 0800 tomorr - I have no clue on decoding these readings<

Car failed Fast Idle (2.964 CO; max being 0.3) also Lamba at .928 (0.97 being the lowest limit). HC reading is fine. CO is also over for Natural Idle (1.210; max being 0.5)

Only idea I have is that one cyl may not be firing - its a V8, and I thought it a little lumpy this morning...

Thanks for any help as I've already sold it and want the guy to have it in top nick

D

Sith

Cat on wayout possibly. Otherwise haven't a clue, sorry.

Paulo P

iTrader: (42)

What sort of car is it

Have you taken it for a blast recently?

There are a few things that could be wrong, does it smell of fuel if you stand at the back? Was it properly warm when they tested it?

Diesel

Dont say Cat Sith! Say £22 lambda probe please!!!!

Was warm, no petrol smell...

Its a nasty child eating Range Rover

Sith

Oh yeah sorry. It will be a £22 Lambda sensor.












That lives in the verrrrrry expensive cat. Sorry!

David Lock

Even if it didn't have a working 'cat the fast idle CO seems way high. She has got to be running on all 8 cylinders although if one wasn't firing then I would have guessed that the HC reading would be high as unburnt fuel going through the system. Can you take the plugs out to check on spark plug condition or take plug caps off one by one when engine is running as that should tell you which ones are firing i.e. if you take one off and it makes no difference then it is probably not firing. What year is Rangie? Disclaimer - not mechanic just some suggestions.

Diesel

Great tips - thanks a lot David. Will try before I go to the garage. Cheers

Leslie

Sometimes a small leak in the exhaust can throw the emissions completely. Doesn't have to be that big a leak either.

Les

Sith

Air leak on inlet side?? After Air meter.

Diesel

Prob Oxygen sensors x2 - LR want £300. Partco will do 'em for £90. I F'in HATE these main stealers and LR part prices!!!!

David Lock

I wondered how you got on. Still I suppose that's better than a new 'cat. Just hope the sensors do the trick. The reason I asked year of Rangie was to see if it actually had to have a 'cat.

Know what you mean about main stealers. Driver's door handle broke on my old Jag. Over £200 from Jaguars but sourced a second hand one (but still in original packaging) from a mate who specialises in restoring Jags for £50.

ALi-B

iTrader: (1)

Could you quote the HC...I know it passed on that (HC limit is very very high, so is easy to pass), but it's a key thing to tell if your shoving fuel through the exhaust.

Hows the engine running? key thing to look for on Rover v8's for missfires is to physically looks at the engine running, is it shaking or rocking? you should be able to put you hand on a rocker cover or plenum chamber and not feel any imbalance (careful...hot!). Listen to the air through the exhaust is another way, should be a constant drone, if you hear a imtermittent sucking of air back into the tailpipe - usually it's a missfire.

If there is. new spark Plugs and leads. Infact if it were me, I'd do that anyway regardless. I would check the dizzy cap and rotor arm as well (unless it's the later coil pack jobby) Next step would be the OS sensors.

Finally, hows it been driven? Round town/city or motorway? These things can foul themselve up terribly if used to totter about. A good fast run can clear things up no end (providing you've ruled out the o2 sensor/mixture as the fault).

Diesel

Ali - you know your onions mate. She was deffo a bit lumpy! Plugs dodn and they helped a bit.

Partco ones didnt fit Sourced some from http://www.lambdasensor.com £160 for two. Still half stealer cost.

Will let you know if they did the trick tomorr