3.5 EFi Stalling Please help

[dod51e]

UPDATE
Now it won't even start!!! :(

My 1986 3.5 EFi auto has developed a rather terminal problem.  It will start from cold with no problem at all and runs absolutly fine.  BUT, after only 2 to 3 minutes, as it warms up, the revs will reduce slightly and then eventually die.  I have repeated this and tried revving it as the idle dies down and it will back fire through the aircleaner like a good-un.  It will then die.

It is not the fuel.  Recently had a new fuel pump and filter.  New dizzy cap, rotar and plugs.  Swapping the ECU makes no difference either.  Leads replaced last year (rr hardly used, only 3000 miles/year).  It is not the over-run shutoff valve as this would not allow idle after starting.

Any idea's?

[DaveS]

Has the vacuum advance pipe split or come off?

[chiboy]

:D Had same prob with my old rangie it was the air flow meter

[jjsaul]

Is it LPG? (or has it been at some point)?

[Rossko]

"It is not the fuel. Recently had a new fuel pump and filter"  mm, wouldn't bet on that.  The disturbance may have kicked up sediment, and/or a pipe may have got kinked, or an electrical connector loosened off.

Another contender is the engine temp sensor (there is one for the dashboard gauge and another one for the ECU, so even if the gauge reads sensibly it doesn't prove the ECU isn't thinking it's +200C).  The manuals tell you how to check for a sensible resistance reading with a meter.

'fraid I'd bet on airflow sensor too!

good luck, Ross K

[dod51e]

Thanks for the advice so far guys.  The vacuum hose is in tact and connected.  Fuel pump and filter replaced very recently and supply seems OK as it will start and run from cold.  Will try testing the temp sender and try replacing the air mass meter.  Will keep you posted.
Thanks again.

[Rainbird]

the rotor arm and dizzy cap are genuine ones are they?  The Rover V8 seems to be extremely fussy about these.  I made the mistake of going for cheaper pattern ones and ended up with it running fine when cold and a total pig when hot

[Range Rover Blues]

And there are lot of dodgy ones about judging by the threads on here :shock:

[dod51e]

Update No. 2

It is not the fuel pump or filter, got fuel,
Replaced the coil for good measure, not the spark,
Not the potentiometer,
Not the injectors
Not the extra air valve,

Had satisfactory readings from the temp sender.
Odd readings from the airmass meter.

Swapped the air mass meter and it still wouldn't go :(bigcry):
So I gave up and had some tea.  
However at 7.00pm it started....and lasted only two minutes.
This time I called in the big guns....called the mechanic.
it appears that the temp sender can give correct readings with a test meter but that doesn't mean it will work!!!  Typical land rover part really :evil:
I will try fitting a new temp sender tomorrow and let you all know.  Thanks for all the help so far.

[Range Rover Blues]

Sounds like mine when the coil went, so what about the Dizzy HT amp thingy?

You need a spark tester, Gunsons made them and a few places still stock them.

[dod51e]

AT LAST!!!!!!!!!!!!!  \:D/
The stalling after two or three minutes of running eventually boiled down to the temperature sender.....only had to replace it with three new ones!!  This tial was hindered by a dodgy fuel pump (nice one Britparts).   One day it would work and then it would not work the next day.  Mind of it's own....as the car did not move from one day to another.  So today's prize goes to rossko for being the nearest.  All that is required now is to hid the leak from the steering box to try to get through the MOT this year and you never know the old girl may be ready for Billing.  The RR may also be ready!  

P.S.  I f you make comments like this make sure her in doors is not reading it :oops: .  Headache now from a swift clip round the ear and not from the car. :(blackeye):