running problem>>HELP

[clairedave]

3.9v8 rangie broke down,misfiring 2 weeks ago,thrasher sent new AFM,which was fitted this evening,ran fine for 20 minutes,apart from white smoke?which cleared only when engine revved.Once engine was hot,became very lumpy and did not want to run again!
 Also AFM burnt out,this vehicle has had a full service ,new leads,plugs etc,i am now puzzled why engine doesnt run,be grateful for any ideas,sggestions,advice apart from scrapping it of course!!dave

[muddysteve]

"3.9v8" "white smoke" "lumpy when hot"

Sounds like water getting into the cylinders  :shock:

maybe head gasket or possibly something worse


Steve

[clairedave]

cheers for that !! getting more and more fed up with this problem!!oh well see what happens.

[lrmike]

Fuel injector sticking? high feul pressure?  It may run OK cold like that, but poorly as it heats up.  Coolant in the cylanders is also possible, especially due to the white smoke.  A good coolant pressure test, plugs out, then crank it should reveal where if it is.

PLUGS OUT or the engine will hydrolock if there is coolant getting in there!

[blackbob]

best to do a compression test
remove all the plugs and use a compression tester
think halfortds do one or try e bay
also try running it with the rad cap off and see if it has air bubbles in the coolant at tickover these are signs of a blown head gasket

[clairedave]

have contatced a mate who works for landrover recovery,he is coming this weekend thinks its electrical problem,let u all know,fingers crossed etc.if he cant fix it then we are in trouble.

[Xtremeteam]

sounds like a headgasket on its way out

[Range Rover Blues]

So have you cooked 2 AFM, or are you saying the 1st was toasted for sure?  In which case it may have done a little damage.

Are yu sure the ECU is still good, ours would run fine from cold (went like a train) but was awful when hot.  A V8 will steam in this weather, it's BL***Y COLD.  If you saw mine set of up the road you'd think it ran on old rope.

[Greybeard]

This is exactly the same problem i am having. Have rebuilt the engine and should be firing her up tonight , also replacing the ignition amplifier with a known good one.

Will let all know.
As an aside, my old headgaskets were fine. but i did have an incorrect reading when testing the amp as per Mr.Haynes.

Steve

[clairedave]

landrover technician thinks it is amplifier on dizzy<this is a common fault on classics,when cold runs as if nothing is wrong!Then as engine reaches temp amplifier signals break down. :? He hopes to be here before the weekend to change part and check out engine,does not think it is head gasket and AFM the first one,one of the glow wires have broken off;but engine still ran.so finger crossed again :?:

[Range Rover Blues]

landrover technician thinks it is amplifier on dizzy<this is a common fault on classics,when cold runs as if nothing is wrong!Then as engine reaches temp amplifier signals break down. :? He hopes to be here before the weekend to change part and check out engine,does not think it is head gasket and AFM the first one,one of the glow wires have broken off;but engine still ran.so finger crossed again :?:

Interesting.

I know that the hot-wire EFi is more tolerant of faults, it can run with the AFM bust oif all the other sensors are working, unlike the flapper EFi from the 3.5.

Does yours have Cats?

[clairedave]

had it running last week after i fitted new afm ,then sat broke down after about 100 miles. miss firing so to night i have fitted new amp and started first turn of key , fingers crossed i will have some trouble free motoring dave :lol:

[H]

had the amp fault on mine but the symptons where different mine owuld just cut out even under load, quiet worrying did it a couple of times in the midddle of the middle lane of the motorway at speed.

H