v8 p6 cutting out

C

chris_v888

Member
hi im new on hear its been a long time since ive owend a rover had some p5bs p6 is 2 sd1 just got a 72 p6 when i was on way home the old girl done well 80-90mph all the way home got into town and stoped at set of lights and she staled? but started and got me home since ive had it home and used it it the usual on chock then when driving and she gets warm it starts to miss? :cry: and will cutout its donethis each time i take her out? oil in carbs seems ok changed condensor clesnd all plugs but it still dose it. im thinking eletronic ignishon arfter xmas any other things that may cure it o it has a phasit fule pump but out of all the rovers ive had all v8ts this one the werst and its doing my head in lol anyone help many thanks chris :!:
 
I'd be looking for an air leak. Look anywhere that air can enter the inlet manifold other than through the carbs. This will result in a lean idle mixture. Air leaks have much less effect at larger throttle openings.
 
When you say cuts out do you mean that is just stops regardless of revs or speed or is it when it returns to idle.
Splits in vacuum hoses can cause poor running and are sometimes hard to find, for example the small rubber right angle connector that feeds the distributor is prone to splitting.
Mention any thing to do with heat and cut outs and the specter of fuel vaporization is a likely cause but equally it could be a failing coil.

Graeme
 
thanks for replys when i start her she runs a bit like most old cars bit like it could? only for a min or 2 then ok till it gets worm then plays up when it cuts out it just goes but dose start again but keeps doing it and gets harder to start? so dont go to far ill try and get some parts together and steem into it thank for help
 
Follow a methodical procedure replacing one item at a time. In this way, you will know exactly what the cause of the problem is.

As Rich suggested, if you have not already replaced the coil, with the correct type I might add, then that is a good place to start.

Ron.
 
hi lads got new coil and eletronic ignition + leads rotor and plugs coming and going to chque for air leek will let you all know haw it goes and only 2 bits im arfter but not in a rush the bit of trim that goes to the right side of clocks that covers screws and a 3.5s steering wheel thanks for all your help and merry xmass to you all :)
 
:D well happy new year to you all got my eletronic ignition but have to send it back as it not for my dizzy so i hope to have all bits by next week and start to sort the old girl out let you all know when done lol
 
had cutting out issues with my rover p6 v8. turned out to be fuel starvation .. check float levels.dirt.filters. I also changed to electronic ignition .new plugs .leads and dizzy cap. air leaks can be a problem with old carbs and leaky gaskets.. check with soapy water when running for sucking in etc at possible leak point.spindle seals etc.
 
:? well changed the leads electronic ignition new coil rotor arm dont know whats a decent set of plus to get then new cap if none of that works it must be fule felated has a electric fule pump n filter but its doing my nut in now wouldant mind got a set of alloys for the old girl now to o well any sergestions welcom
 
I used to have fuel starvation problems in my V8 so I cured that with an electric fuel pump, worked ok for about 2 or 3 years then I started to get similar symptoms to yours.
Turned out that my electric fuel pump was failing so I reverted to my original mechanical pump, problem sorted.
Just a thought, it may not be that but fueling problems are usually cured by the electric pump so it was very counter intuitive at the time to suspect the electric pump.
Even when I checked my electric seemed to produce good fuel flow and it wasn't until the pump failed entirely that it became obvious that the pump was the the culprit.

Graeme
 
met a guy at my local car club had a rover p5 turned out he was a mechanic and had a p6 and had others too. he is retired now so just joyrides now and then.
mentioned my car cutting out when slowing or even without warning. said it quit often turns out of normal issues are ruled out such as timing. vacuum leak etc it was not unknown for heat evaporation to carbs to cause such issues. seem the fuel bubbles from in lines near carbs etc due to heat from engine. ok when running as fresh fuel being pumped round. when demand for fuel drops off ..the fuel 'boils' and gasses away so engine gets air /fumes not cold neat fuel in carbs.. hence won't run.
seems this was common around early 1980's on other cars such as ford sierras etc. they fitted a heat shield between carb and inlet manifold. plus fuel return line allowed non used fuel to run back to tank thus removing heat surge in fuel system . ( gas bubbles) other cars had carbon fuel canister fitted to assist in fuel handling issues.
 
Hi, that ties in with the introduction of unleaded fuel which is more volatile, if you
get it on your hands it feels colder because it boils off quicker.

Colin
 
hi this sounds silly? this cutting out thing doing my head in but ive notised thet the walter pipe that runs under the inlet manifold is not there? lol recon this could be the corse of it cutting out ? was thinking of moddifiying a manifold so i could use a webber carb and hopefully will sort it all???? what do you all recon? snowing down hear in the s/e so wont get to do it for a bit lol
 
do you have a heater? If the pipe is missing and you have coolant in the rad you need to work out how it's been plumbed...
 
the pipe has been reruted to the heater, but ive done the plugs leads and fitted eletronic ignition it seamed ok but tickover low now i took plug leads off one at a time on left bank as you look at it from frount. first one revs changed next one nothing sane with the next one larst one revs changed so i took plugs out frount 2 ie 1-2 plugs dry not bad think maybe bit lean same for back 2 7-8 where the same 3-4-5-6 all black and sotty dose pne carb feed frount 2 and back 2 cyilinders and the other the middal 4? :? :!:
 
hi, ok maybe I have misunderstood what u said in ur last post but if u are able to pull off ht leads with out a change in engine note/misfire/idle then I would say u have a spark problem.

coop
 
on the standard rover v8 manifold -you DO need water circulation through it !! the tower the carbs mount too will transfer heat to carbs and you get evapouration which causes stalls--- and thats a fact as i had same symptoms on a 3.5 However if you fit a Huffaker 4 barrel manifold that doesnt have water cooling the economy will suffer due to fuel used to cool manifold===so either--get water flow through manifold or suffer
Also you say you got a Facet pump-- Which one ? I put a red top Facet on a 3500s and it couldnt supply enough at higher rpms -- so got a pump from Real Steel= that cured it
 
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