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Gudday,

At a bit of a loss with this one - my Brumby has developed a problem where it starts fine when cold but then under first accelaration seems like it is having trouble getting fuel so I can't get out of 1st or second. It doesn't stop but feels like its not getting enough fuel.

Then after about 2-5 mins running at standstill its fine to drive. All goes well unless the temp guage gets over half (i.e. in traffic) then it develops the same problem with a big accelaration dead spot and once again cannot get out of 1st or 2nd. Once it gets this problem hot it won't recover and I have to let it cool down for about 30-40 mins, then again it works fine.

I have:-

Had the carby rebuilt and the fuel pump in the carby checked

Made sure there's no vacumn leaks to the carby

Checked the fuel supply and replaced all fuel filters (2)

Fitted new plugs and leads



I am thinking it may be an electrical problem - Don't know what else to do - has anyone else had this problem and found a solution? Any help welcomed.

Simon.

Head gasket maybe?

i had simler trouble wen mine got worm on the beach
some times cuts out and flat spots (blocked filter)
ea81 brumby 90

try cleaning out the tank and check your thrmo fan

Whats your dizzy cap and rotor button like?

Has the drain hole in the dizzy been blocked off?

Check valve clearances

if the button in the cap sticks/falls out that gives it a mad flat spot/lack of power. have you checked both fuel filters? brumby's had two...

Thanks for all the tips - reply to all of you:-

Have checked the distributor and rotor and seem to be fine - not too much play.

Don't think it's the head gasket as I had a mech. have a quick look.

Checked a replaced both fuel filters

Valves - well - not sure about this - she's done 285K and is a little noisey so maybe - would this cause loss of power when cold and hot.

To get me back on the road I got Lucas Auto to hard wire the fan so I don't get the overheating problem.

Still convinced it's the carby but the carby joint I took it too think its fine. Mate of mine reckons the fuel pump plunger is faulty.

I'll keep on trying, just not looking forward to 40 degree days.

Cheers Everyone who took the time to give advice,

Simon.

If it is a EA82 it should have those rattly lifters that are supposed to take care of your valve clearances for you.
Can you get hold of another ignition coil for trial purposes?
Sometimes they can get a bit suss as things start to warm up..........

would i be right in saying that as it's an ea82 its not the original engine? i thought all brumby's came with an ea81 (two variants, one with breaker points and one with electronic ignition)...

have you had a really REALLY good look for any vacuum leaks? hoses disconnected, or hardened and cracked? any play at all in the throttle shafts? have you got an emissions device that lets air into the manifold on decelleration? they play up (its a canister looking thing with a few vacuum lines, one small one big on it) i found they play up and make all sorts of weird shit happen.

when it gets hot there is a thermocoupling that lets air into the manifold thus increasing revs and making fan spin faster and cooling it down... i think?

My old brumby had vavle issues that sound like that thought it was going to be a heads off affair etc. Just was ineed of a little adjustment took about half hour to check /adjust all 8 vavles.
They are a solid lifter in the 81 motors.
Ea 82 (over head cam) take quiet a few mods to fit into a brumby

Heat makes metal expand when it warms up.

Valves might make compression when could but when it warms up they expand causing it to miss (valve clearances reducing)

Yep, I'm an idiot - it's an EA81!

May need to revisit the vacuum leaks. Maybe one opens when it gets to a certain temp - but which one??????

Valves sound a bit more difficult to me - is it a backyard job and what specs did you follow???

The coil seems to be working fine - would be wortha try though.

Cheers,

Simon.

valves are easier than you would think. normally if you can hear them they are ok, but definitely worth a check.

dumb question time... what do your spark plugs look like and what plugs are you running? are they gapped ok?

are you sure the throttle shafts are ok? wiggle them up and down with the engine running and see if the engine rpm varies wildly...

dose your trouble with lose of power happen more with less fuel in the tank if so take the first filter out (the one under the tray) shake it and tip it into a containor you may need to blow the fuel threw. rember to tip reverse of the direction of flow. check for crap. put the filter back in normal direction or replace
i have been having silmler troubles for a while. tonight i found black stuf on the bottom dont know wat it is

Everyone,

I have been on the search for a newer Brumby with aircond. Have not had much of a chance with the oldie - but will continue with the trouble shooting soon and provide an update. Anyone want to buy a Brumby?

Simon.

Koorabell wrote: Anyone want to buy a Brumby?

Silly question! The only thing holding me back is the lack of funds that comes with being a uni student...

I've also heard about the large rubber hoses on the passenger side of the engine being put the wrong way around will screw up some system on the motor and make it run like a sick dog. I know its a long shot, but try swapping these around and see what happens.

Cheers

Bennie

I've got an 89 brumby with the same problem as you described but mine makes a vibration noise when it happens like a worn bearing.

It feels like it's losing power but last time it happened I gave the engine a good rev and it revs well but the car doesn't speed up, so i thought it might be clutch. Then I noticed it making the vibration noises when I was sitting at the lights with the clutch out and in neutral? Does it cruising sometimes, makes the vibration noise, feels like it starving for fuel then kinda clicks back to normal.

Got me stumped too.

GL-5 wrote:I've got an 89 brumby with the same problem as you described but mine makes a vibration noise when it happens like a worn bearing.

It feels like it's losing power but last time it happened I gave the engine a good rev and it revs well but the car doesn't speed up, so i thought it might be clutch. Then I noticed it making the vibration noises when I was sitting at the lights with the clutch out and in neutral? Does it cruising sometimes, makes the vibration noise, feels like it starving for fuel then kinda clicks back to normal.

Got me stumped too.

Sounds like the carby / base has gone porous.
Or you have a hole in the diaphragm in the fuel pump. I have had both happen to a couple of my 'MY' wagons.....

Xtreme_RX wrote:Sounds like the carby / base has gone porous.
Or you have a hole in the diaphragm in the fuel pump. I have had both happen to a couple of my 'MY' wagons.....

Could Also be main jet has a partial blokage

Check the valve clearances.

have you used that e10 blend
i have once trouble since i think

mate of mine put 1 tanke in his bike rust in the tank straight away and damaged carby

the gumbi brumby wrote:mate of mine put 1 tanke in his bike rust in the tank straight away and damaged carby

Hmmm I find that hard to believe - he would have had some old components in there for that to happen, the fuel being the catalyst for him to find all the things that were aged and had broken down. E10 in a healthy fuel system will not cause any troubles.

Cheers

Bennie