Engine bogs down and cuts out when depressing the pedal
Turbo Mini Forums

Hi Folks,

I am having a hard time getting my engine running properly, it is bogging down and cutting out with the smallest depersion of the pedal. to rule out the carb i rebuilt it with a new rebuild kit (and one of the great guides on here). This did not fix my problem, i have checked all the hoses for air leaks with no luck.

I adjusted the timing to the apropriate 7 degrees and still no change, when i advanced the timing the engine did start to rev freely but the car wouldnt move under load. So i am thinking of re-visiting the dash pot oil and tyrying a thinner oil?

If anyone has any thoughts please let me know!

sorry should have siad its a standard 1275 turbo

Have you got a wideband fitted??

You may have checked all the hoses on the carb, but the symptoms are exactly what you get when the lean off pipe is split or leaking.

Have you put a new one on?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Which pedal?

Sorry, the throttle pedal. No wide band fitted as of yet, i can look into getting one if it will help me.

I havenet replaced the lean off pipe with new one but did check it, i will replace it just to rule it out.

Am i right in thinking there should be one pipe blocked off next to the two fuel pipes?

i'll say iar leak somewhere,

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

air leak, no oil in the dashpot ( or too thin oil ), or simple fuel supply problem.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Two fuel pipes?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Ruled out fuel problem today, getting ample pressure, used two pumps and checked fuel lines. Oil I am using is 20 50, will try others this weekend.

By two fuel pipes I meant the two from the regulator, the picture is one iv used before to set up the connections but where it says dump, boost gauge I have a breather from the timing case connected. Is this right??

Fuel pressure in the float chamber is not pressureised by the rising rate of the fuel pressure regulator. Rather by a pressure feed from the plenum. But as your problem is not boost related, it's not that.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Well after some fiddling and using the T piece trick the engine is now running but intermittently i am still getting this problem.... As soon as the accelerator is depressed it bogs down and dies. Is the std mini fuel pipe large enough to use as a fuel supply line? im hoping this is just a fueling issue, i need to get a better idea of my fueling mixture before i end up doing some harm.

Any recommendations?

Still getting nowhere with this....

The engine still idles fine but i get a bit of a backfire through the carb and the engine wants to die when revved. It will rev freely over 2,500.

I am on the lookout for a replacement distributor but i haven't found one yet. I don't want to throw money away if the distributor isn't the issue.

I have considered a megajolt to rule out ignition completely but again its a bit pricey if the distributor isnt at fault.

I have done the timing to 7 degrees btdc

Here is a video of the problem if it is of any use.

http://youtu.be/vDNxwZVZzh0

Thanks!!

Popping through the carb indicates lean mixture.

Try blocking both ends of the part throttle lean off pipe.

In the 13's at last!.. Just

I think iv done this already, is that the pipe which would go from the pipe to the side of the float inlet to the top of the carb?

Nope iv not done that yet, i will give it a go!

does whipping the choke out at the point it struggles help?

Yes i moved to the darkside

Instagram @jdm_brett

Yea will rev up freely on choke

as long as everything else is correct and working it sounds like it has the wrong needle to me

Yes i moved to the darkside

Instagram @jdm_brett

Pretty sure it cant be the needle unless i was supplied the wrong needle in the turbo carb rebuild kit. If it helps the other turbo carb i had on first also had the same issue...

so you have eliminated all whats suggested above and still does it

Yes i moved to the darkside

Instagram @jdm_brett

Hi, mine is doing the same did you sus it what the issue is ???

Briefly tried to block the two pipes but iv got my minivans mot tomorrow so couldn't spend much time tonight. Will try suggestions properly tomorrow!

thanks

It is a lack of fuel. And sounds like either wrong needle or poorly adjusted needle, assuming dashpot has oil etc etc etc

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Did you fit the correct gasket between the carb and plenum? The turbo gasket has the extra hole. If your not sure, try the the t piece trick to rule it out.