Over fuelling on the wife's 280i

[Mr Tank]

Hi

I have hit a problem with the wife's 280i.
The car has been in store for a few years, so I drained all the very stale fuel out last week, I then replaced the fuel filter, and gave the engine a service, new plugs, leads, oil etc.
Today we put in fresh fuel but ever time will tried to start it, she flooded.
We eventually got her running by disconnecting the fuel pump, I then starter her up and Simon would then quickly reconect the pump while I keeped the revs up. She ran but was over fuelling and would not tick over.

Any ideas?

Andy

[MJG280]

Could be the cold start injector continuously working. It's on the left hand side of the plenum facing from the front.

I have detailed guidance scanned from my TVR manual as to what everything is. alos some other bits. Email me on my profile and I can send it That obviously applies to anyone else as well.

[adam quantrill]

Also check the trturn pipe to the tank is clear (blow down it) as if not you can get too high fuel pressure on those ford jobbies.

[benebob]

Remove the cold start injector and delete it with a bolt rather than a banjo bolt. My guess that isn't your issue but rather a stuck injetor or a few. Those can easily be determined by pulling 'em out and turning the car over. They are fairly easy to clean with a can of gum out and the spray hose stuffed down the back side to push the spring and open the injector. Problem is they're steel inside and will rot with bad/ no gas pressure in there.

[Mr Tank]

Hi

Thanks for the replys.

We had disconected the cold start injector and had also blown down the return pipe, so thanks for those ideas!

The idea of an injector/injectors being stuck might be the reason/explain why we thought that it was over fuelling on one side more than the other, I will have them out next weekend and see what's happening!

Unless anybody else has any further ideas?

Thanks

Andy

[NTEL]

Mr Tank said:

Hi

Thanks for the replys.

We had disconected the cold start injector and had also blown down the return pipe, so thanks for those ideas!

The idea of an injector/injectors being stuck might be the reason/explain why we thought that it was over fuelling on one side more than the other, I will have them out next weekend and see what's happening!

Unless anybody else has any further ideas?

Thanks

Andy

junk the injection system and fit carbs oh

[Wedg1e]

Check the airflow meter flap lifts and returns OK? if the piston sticks 'up' it will overfuel.

[Mr Tank]

Hi

Wedg1e, we did what you suggested and it's fine.

The idea of dumping the injectors and fitting carbs, well what can I say!

Andy

[benebob]

Mr Tank, its about an hour job to remove the intake manifold and the injectors. Get some silicone spray to lube em up for reinstallation. You'll want a helper there to look at the injectors when you fire the car. Better yet hard wire the fuel pump so you're not turning over the car. Then you'll want some papertowels under each one once you're done for a 1/2 hour or so to make sure they aren't leaking as the car stays under pressure for 20 minutes or so to aide with hot starts. You'll need a 10mm and an 8mm. You might not have to completely remove the upper intake. Just a hose or two gives you enough access under it.

Another thing to take a look at is your return line for the fuel meter. Are you getting fuel coming back to the tank? Mine after sitting was quite gunked up in the valve there. You can remove this with the meter still on the car but be careful as bits like to drop down.

[jeff m]

If it ran ok before then the fuel pressure should be ok.
So the FD and WUR can be initially ignored.
Only two ways for a CIS car to get extra gas, one is the cold start injecter operated by the thermotime switch.
The other is air.
Any extra air will lift that big plate thing that I've forgotten the name of
Source of extra air for cold start is the Aux Air device, this can get gummed and stick open.
Front right side of engine. Two hoses and a couple of bolts to remove it. Spray with carb cleaner, then hold over gas flame to check it closes before replacing. Cold open - closes as it gets warm.

[benebob]

Jeff, you obviously haven't seen my CIS system . Since it sat, check out the two things I brought up. I'd put money on one of 'em being the issue.

[jeff m]

benebob said:

Jeff, you obviously haven't seen my CIS system . Since it sat, check out the two things I brought up. I'd put money on one of 'em being the issue.

I was giving him an easier option before he starts tearing it to bits.
(should have just said "squeeze the hose with a pair of pliers")

Edited by jeff m on Tuesday 13th April 11:24

[benebob]

:DEasy option. That's funny.

[Mr Tank]

Hi

The saga continues.

Removed the injectors (10 mins work) had them set up out of the engine and turned the ign on and fuel pumped out of all of them. The fuel pump and injection pump keeped running until we turned off the ign!

That is not right! Surely the pump should not run all the time!

Any ideas!

Andy

Edited by Mr Tank on Sunday 18th April 18:59

Edited by Mr Tank on Sunday 18th April 18:59

Edited by Mr Tank on Sunday 18th April 19:00

Edited by Mr Tank on Sunday 18th April 19:20

[Mr Tank]

Hi

Well the over fuelling is sorted, I had the whole injection pump/metering head apart to day, to get to the control plunger which was so seized I had to use a little heat to free it! After reassemble, it no longer pumps fuel out of the injectors till I lift the sensor plate then it pumps fuel as it should!
Just have to bolt the rest back together and then it should be sorted OK!

Andy