Engine splutters when on boost and is spitting back into the carb
Turbo Mini Forums

Hi everyone

I recently fitted a new engine and i did post a thread about the engine smoking which i found out was because the valve stem seals kept lifting up. However i have another problem.

The engine is spluttering when on boost and sometimes the boost spikes. It also hesitates when trying to rev it from idle and spits back into the carb. I thought it was a fueling issue and have just fitted a brand new regulator but that isnt the problem. I have also tried different mixture settings. Or could it be something to do with the turbo and boost/vacumm hoses.

Any ideas?

Thanks
Adam

My project Toyota powered mini: http://www.turbominis.co.uk/forums/index.p...tid=470448&fr=0

Id suggest you take it to a rolling road and have it setup by someone. It might cost you 100 quid but itll save you money in the long run.

Mike

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

Yeah ive got it booked in at minispeed for next week but i want the car to drive well enough for me to get it there.

My project Toyota powered mini: http://www.turbominis.co.uk/forums/index.p...tid=470448&fr=0

Do you have any oil in dash pot? Has it ever run ok?

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

have you checked timing???

Done now needs redoing lol

yeah theres oil in the dashpot and its fitted with megajolt and currently running the standard metro turbo ignition map.

I did have it running ok before and it was boosting fine. The only thing ive changed is the rockers, from high lift ones to some 1.3 roller rockers.

My project Toyota powered mini: http://www.turbominis.co.uk/forums/index.p...tid=470448&fr=0

you could change the rockers bk

Done now needs redoing lol

ive had that a few times when fettling needles, wb02 always said lean and more fuel cured it
im not an expert just sharing my experiences

that is after thiming is checked btw

Edited by Brett on 23rd May, 2011.

Yes i moved to the darkside

Instagram @jdm_brett

1293 Turbo mini

When you changed the rockers did you drain the water??

Did you change the gasket or leave it? It may be that when changing the rockers you disturbed the sealed gasket.

My money is on it being weak mixture, possibly made worse by wrong/insufficient oil in the dashpot.

lean mixture. Ive got the same problem atm at a certain throttle point. How did u stop ur stem seals pushing up?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

I kept pushing them back down with a screwdriver but within 2 minutes of running they were back up again. So i changed all the seals by making this tool that levered off the head studs and compressed the valve springs. The only thing is i had to fill the bore with string to stop the valve dropping down (i was too lazy to take the head off) I also changed the rockers as well from some high lift ones to some 1.3s and now its stopped smoking completely. but i have looked again and one has pushed back up! so its staying there for the moment.

My project Toyota powered mini: http://www.turbominis.co.uk/forums/index.p...tid=470448&fr=0

i was thinking of doing the same as its a basterd to take head off. So did u push a roll of string then push the piston up to the valves?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

i was thinking of doing the same as its a basterd to take head off. So did u push a roll of string then push the piston up to the valves?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

yeah you just have to keep feeding the ball of string in, it does take a lot. I moved the piston up first and used a screwdriver to pack it in tight.

My project Toyota powered mini: http://www.turbominis.co.uk/forums/index.p...tid=470448&fr=0

Lil tip me and dad made an adaptor out of a old spark plug with a male air line connector and used air pressure in the cylinder to hold the valve up, worked a treat!

If in doubt... flat out! The words of a true legend

gd idea ben. Il try 1 of those. Anything to avoid taking the head off

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

Worst case if you drop a valve head off.

If something is worth doing, it's worth doing half of.