Idle issues
Turbo Mini Forums

Please be aware that its not my car that has the problem, but a friend does.

Anyway,

My mate has just put a standard Metro turbo engine and gearbox in his 1275 GT.
Everything is hooked in as per threads on here, for fuel / vacume etc etc.

Problem we are having is that the car will only idle (rough) while on the chock.
As soon as we take it off the choke and run it on the throttle, it dies off(at idle)
If we run it up the rev range a bit, and let it drop to idle on its own, it dies off.
We have tried the mixture screw, but to no avail.

ALSO,
Id we block the "anti run on valve conn" on the carb, the car will not start regadless of choke or not. The car will run fine with the port un-blocked.
Ive been reading about the "T-peice trick on here and im presuming this will cure this slight problem. Will check later tonight hopefully.

But as for the running issue im stumped, we have checked and double checked everything, and tried another Turbo Carb, yet still not playing.

Anyone have any thought on the above?
If you have any questions, ill answer as good as possible. Just need this thing going ASAP.
All help will be greatly apprciated.

Rory

Edited by Rory on 1st Jul, 2009.

Sure you do not have a vacuum leak?? if its sucking air in somewhere it would do that.

Terry

website:- http://www.terryhunt.co.uk

As above sounds like an air leak forward of the butterfly. What size are the fuel lines in the tank?

Own the day

Turbo Tel - Cant find any air leaks, that was my first thought.

Mr Joshua - Unsure on the size of the fuel lines, im presuming the standard size for a 1275GT, again it isnt my own car.

Having a thought after dinner, im presuming the gasket between the carb and plenum is diffirent to that of a standard carb to filter? (Turbo to N/A)
It has a standard gasket in there from an N/A setup.

Spray the entire manifold and carb with wd40 and see if makes the engine run normal. You have to drench it tho!

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 got a fuel return line to the tank ?
also have you got the turbo fuel pump and the rising rate fuel pressure regulater fitted in ??........... correctley!

MikeRace - Ill let him no to give that a go.

Benross - Im sure he has the Pacet Redtop pump, and he also has the adjustable fuel reg.
Its also connected up the only way it can (as per pictures on here)

If he is utilising the original fuel supply line from the tank this could be where your problems lie.

I know many neah all will say its ok to use the original tank outlet and all you need is to plumn in a return. But on my car I had to cut fit a larger bore pipe.

next time you run the car take a look in the fuel tank if the returning fuel flow stops just before she dies the above is part of your problem.

Own the day

Red top is not suitable for use with the std metro FPR and carb. You need a higher pressure pump.

There is an additional hole in the carb gasket on the turbo. Make sure this is present on yours.

In the 13's at last!.. Just

Mr Joshua - It doesnt run a return line to the tank. Forgot to mention it doesnt run the EFI side of things (no electronics)

theoneeyedlizard - Do you have any recomendations for a pump an ill pass it on?
Also it isnt a standard metro FPR as far as im aware. He ordered it from Avonbar. Ill have to find out for sure though.

Ok, ill have to have a look at the gasket, which port has to be open?

Facet Red Top Electric Fuel Pump Kit. Comes supplied with two 90 degree unions, mounting rubbers and spare filter. Facet Red Top Fuel Pump Competition version is 12v negative earth. 6.0-7.25PSI pressure and has a flow rate of 35 Gallons per hour. 1/4npt ports. Is suitable for 200+ BHP applications.

Copied this from a web page.

The fuel pressure regulator (standard trim)should be set to deliver fuel at 5psi when the engine is at idle (correct me if I am wrong). If the above is correct you will only we able to run 2.25psi of boost seeing as fuel pressure (with the correct set-up)increases with boost pressure.

You are not producing enougth fuel pressure! as mentioned in the previous post. you need a pump capable of fuel injection pressures. The OE Metro fuel pump was also fitted to the Rover SD1, 2.0l Maesrto & Montego Turbo's and the Montego and Maestro 2.0l EFI's and can deliver over 2bar of pressure 28psi.

Own the day

Own the day

to be honest though, this still would allow it to go above idle, just not on boost so there are other issues

Mr Joshua - Im talking kek, it does have a return line.
As for the pump that makes sense, ill let him know asap.

Iain - Im thinking its something to do with the gasket for the idle problem.
Unsure though, its new teritory to me.

Own the day

gasket between the plenum and carb would make no difference on or around idle.

I would be suprised if you couldnt blip the throttle, remember, the pump can be off and there should be enough in the carb to get it to pick up briefly.

I am assuming that when Rory is on about getting above idle, it is out of gear.

Edited by iain on 1st Jul, 2009.

I speak from experience from start and leaving the thing to idle it would stall, took about a minute, you could hear the pitch of the pump change. Disconnecting the exit pipe from the pump (with it still turning) revealed that the flow had stopped. Big light bulb goes off in head followed by major tank heart surgery.

Own the day

Asumed correct.
The car is stationary in its lockup.

Edited by Rory on 1st Jul, 2009.

it could be the feed but if a facet i really doubt it. they dont tend to worry about where the fuel comes from!

Well it was sorted.

Put the hole in the gasket between the plenum and carb, and blocked off the breather port from the top of the carb to the manifold.

Reset everything and away it went.

It wasnt only just me that was scouring the net, trying to find info today.
Few others were also trawling through the forum looking for answers.

Cheers for all the help.

For your info, this is the correct fuel preasure regulator:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...m=130314942500&

and this is the correct pump.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...alenotsupported

Both brand new.

rory, as the members state you need the right fuel pump. as per apbellamys post above
NOT! the red top one
and a return feed to tank or you will run into further problems down the line

Does have one too

Own the day

Benross -
Ive let him know about the fuel pump, and im hoping he takes it on board before damage is done.
And yes it does have a return line (bit of a blank moment on my behalf)

hmm, open breather...

there we go, i think thats the one.

the hole in the gasket wouldnt have helped when it came on boost for the first time. but then neither will not having a pump to cope!