chewy

Right my mate has a Fiesta mk2 running an ERST motor. The car started fine last night but after a little bit running it started to run lumpy so we disnnected the cold start valave and tested it with a mutlimeter and the same with the temp sensor and aux air device. We reconnected said sensors and now we can't get it srated !!!
Today we have tried the obvious things spark at the plug YES, fuel at the metering head NO and have obviously found no fuel getting to the injectors
Has anyone pllllllllllllllllllllllllllllllllllllllease got any ideas ?????

The tank is brand new and so is the fuel filter by the way

Anonymous

metering head fucked? if you loosen the pipe off of the filter does any fuel come through? (the pipe between the filter and metering unit?)

chewy

But it started fine yesterday and we have only had the problems since having the sensors off, it's weird.

Rick

Ok, all sensors must be connected - u can leave the cold start injector off if u like - but shouldnt really make much differences.

When cranking, is the metring flap pulsing? if not, u have a vacume leak - probably round the manifold piping. Get someone to crank the car, then depress the metering flap very slightly (0.5mm at a time), and she should splutter into life

Anonymous

if its like that sounds like something your have just played around with or changed to be honest thats causing it

Anonymous

we had to do that with mine. turned out to be the metering unit. was fine once she started but if ya turned her off then ya have to repeat the process again.

but defo worth doing what Rick just said

chewy

Yeah the flap is bobnig up and down and we have tried to press the flap but nowt

Think we might try to change some sensors tomorrow as Daimondsays it must be something we have had disconnected surely ?

Oh and thanks for the replies lads much appreciated !!

XR-RS

Sorry chewy i didnt tell you id already posted this

But for Rick and Diamonds

Metering flap is pulsing, theres fuel to the cold start and return but nothing to the injectors. all sensors are connected right and it has a good spark and the timing is all spot on.

As said it was running fine all we did was remove the sensors, check them with a multimeter and put them back.........now no fuel to the injectors

Rick

Take an injetor out of the manifold - deprerss the metering flap, crank it, and it should Piss out.

Disconnect the two plugs from the metering head. One is potentiometer, and one supplies current to the fuel pressure reg. This effectively means the ecu and sensors are doing nothing. Crank her, but u prob will need someone to depress the flap a little to richen the mixture.

XR-RS

Ive tried cranking it with the metering flap depressed with and without the cold start connected and still nothing. Then loosened the bolts on the fuel distributor and not a drop comes out of there.

To cut the loom into the xr2 loom ive run a wire with a 10amp fuse from an ignition live to the KE relay. This morning i discovered the fuse was blown, ive since changed it but its made no difference.

The only thing i dont know is why that fuse was blown. Could a faulty fuel relay or fuel ecu cause the lack of fuel to the injectors ?

The pump primes fine and works as it should.Cheers for the replies

cossiemanden

Have you tried the fuel pump or the fuel pump relay?
It is a offen overseen fault on the fieatas and escorts from before 1990.

Rick

XR-RS

Do as i say - disconnect the plugs on the METERING HEAD, not the cold start stuff. This totally elliminates the sensors, ecu, and power to them. Make sure u can hear the fuel pump WHEN CRANKING.

XR-RS

Rick, just been out and disconnected both of the plugs to the metering head. I tried it like that first and then got someone to depress the metering flap at different stages 2mm...5mm.....10mm....20mm.....and so on and nothing at all.

The fuel pump primes for about 2 seconds when you turn the ignition on and then starts up when you start cranking and sounds fine.

Rick

uve got nothing coming out of the injectors then? Forget testing anywhere else - take an injector out and have a look. If fuel here, then everything else is fine. If not, then test where fuel goes into metering head. If fuel here, and none after, the metering head needs looking at.

UNdo all the pipes to it, and there a three torx fittings holding it in place. Undo these, and take the metering unit off. There is a rubber seal - be careful not to damage it. Once u have the metering unit in ur hand, there is a small piston which is what the flap mechanism works on. It only moves about 4mm. It should move in and out very freely, under gravity. They often get gunked up with age. Clean it with WD, and put it all together. If there is Still no fuel to the injectors (depress the flap fully) then u need another metering unit.

XR-RS

Rick, i took two of the injectors out and tried them as you described exactly and nothing at all coming out. There is definitely fuel getting to the metering unit though as when i undo the cold start pipe at the metering unit end fuel sprays out.

The four injector pipe ends on the metering unit, when i undo any of those with the fuel pump priming or the engine cranking theres nothing more than a tiny dribble of fuel, there should be pressure there right ?

Also, with the process youve described that means its down to the metering unit and can be nothing else like a faulty fuel pump relay or fuel ecu ??

Next step then in the morning is to try cleaning it as youve described.Cheers for taking the time to reply and help, much appreciated

Rick

The Relay powers the pump and ECU. If the pump is running, the relay is fine. Undo pipe before filter - it should come out under pressure when pump is running. If it doesn't - u need to look further back. If it is - then see if fuel comes out after the filter. Then the pipe going into the metering unit etc etc.

XR-RS

Thanks for the help Rick, much appreciated