RSKieron

The other issue with my S1 is that when I cold start it it tends to fire up, rev up then die after 3 seconds.

If I continue to do this it eventually starts and runs fine.

I can rev it and hold the revs, but for the first few minutes it runs lumpy.

I'm thinking auto-choke.

Anybody point me in the direction of the auto-choke so I can swap it out for a new one? Or could you think of something else it might be.

After a couple of minutes the car runs perfectly - hot starts perfectly too....

MikeyXR2i

u got to put ya foot down to start it from cold?

RSKieron

No mate, not at all.

It fires up immediately, just dies within 3-4 seconds.

If I rev it, then I can hold the revs at say 2.5K and when I release (after maybe a minute) the car idles and runs fine.

It runs lumpy while I am holding it at 2.5K, but then clears up pretty quickly.

It's got to be a choke problem, the mixture on fire up isn't rich enough. Either that or the fuel pumps on the way out!

MikeyXR2i

u said the pump was struggling?

RSKieron

Not really related to it, but when I put a standard airbox on it, running higher boost the petrol pump was struggling on tickover (at junctions etc) - but I'm pretty sure that's due to the increased boost.

Going to investigate further, but will start with the auto-choke (if I can find it!!)

MikeyXR2i

check the metering head for leaks matey, also make sure the plunger aint sticking in the metering head.

RSKieron

Where abouts to look mate?

MikeyXR2i

Fuel distributor, thing with the red pipes coming off. Electromagnetic Pressure can leak on it causing the fuel pressure to drop off.

RSKieron

Brilliant, thanks.

Will check it tomorrow.

db

Normally increased boost does not influence tickover, I rather think that the standard airbox is getting the tickover rpm a bit down compared to the free flow filter, maybe a bit too low.

Boost increase on a standard, non chipped car doesn't do anything to the fuel supply. It is a mechanical system that does not recognise the increased demand for fuel when under higher boost. So be carefull, you could be running lean when under the increased boost!! And we all know what that could mean.

As for the cold start: the S1 has no choke, it has a cold start injector which makes the mixture richer when the engine is cold. The cold start injector only works at the moment the starter motor is running (key in position 3) and the engine is cold (below 10 degr C). So when the engine starts and you let go of the key, the cold start injector stops. Check the temperature sensor.

Cheers.

RSKieron

Thanks for that mate.

MJC

Kieron, check your fuel pump relay isn't faulty as mine was doing a very similar thing. I doubt it is your fuel pump mate as they tend to get a bit noisey when their getting tired.

MJC

Try bridging the relay and see if it still does it

RSKieron

Where abouts is the relay located mate - want to make sure it's the right one.

Cheers!

MikeyXR2i

Fuel pump relay is, up under the right hand side of the dash.

RSKieron

Great - cheers. Is it marked?

MikeyXR2i

can't remember now, but u will know it.

RSKieron

Thanks again mate

MJC

its the larger silver relay mate

MJC

Let us know how you get on with the relay. You need to bridge pins 87 and 30 by the way

S1 Barkham

I had this Problem, found it to be a boost leak.

RSKieron

where abouts was your boost leak mate?

RSKieron

Hmm.... Weird. Firing up fine now.

Must add plugs, leads etc to the job list!

MJC

Inspect the fuel pump relay mate as that is the exact same problems I was having.

The car would start 1st time every time and tick over for a few seconds and then die. However, if you started it and rev. it to 2.5k + for about 20-30 seconds and then released the throttle it would idle fine (would sound a bit wrough at first when the accelerator was being held).

The fuel pump relay has a switch which has two different power supplies. It has a power supply when you first start the car and once started it switches over to a power supply which reads the impulses from the coil. This way if the engine stalls or fails the fuel supply will be cut off. (not very well described, sorry)

Basically, my fuel pump relay was switching over to the second supply and thinking the engine wasn't running so was just cutting the fuel supply.

Good luck mate

RSKieron

Fantastic. That's EXACTLY the problem. Is the relay specific to the S1 - would you imagine that the local stealership will have one?

Thanks mate - owe you a beer (or 3)

MJC

It is a specific item for the S1. S2 relays are different.

Finis Code: 1630562 Part Number: V85AB9P704BA

Have a go at bridging the relay before you go buying one though just to make sure as the relay is £40.00 and electrical items are non refundable.

All you need to do is unplug the relay and bridge pins 87 and 30 and then start the engine. If all is good then thats your fault.

Good luck

RSKieron

Will try it, problem is, is that the fault seems intermittent....

Have to wait for it to fail again!

Thanks for the code - I take it they are still stocked/available from Ford?

Cheers,

Kieron

MJC

No probs fella, glad I could help

You can still get them from the main dealer but the chances are they won't have it on the shelf. They should be able to order it in for the next day though