hi, got my 930 out for spring on 8/04/09 put £30 of shell v power done about 60 mile including my first of the year region meet no problems, then put £35 of shell v power and problems 5 miles up the road car is spluttering, does not pull over 3000 revs. stop the car try restart little success, call the AA, diagnose possible water in fuel. Car then brought home on wagon, nice bank holiday treat. Any help please, car is due 12000mile service this summer anyway and may take to or be taken to my local specialist on tyneside Tom Ferguson. Thank you Decka.
fuel contamination
- Thread starter dexy911
- Start date
Is the car stock?
Check for fuel in your airbox, if the diaphragm in the WUR has split it causes what you discribe, the tell-tale is fuel venting out of the top of the WUR and into the airbox. Some cars are missing the vent tube, fuel then vents all over the engine which is clearly not a good idea.
I assume you've already checked things like dizzy cap, rotor arm, spark to each plug etc?
Check for fuel in your airbox, if the diaphragm in the WUR has split it causes what you discribe, the tell-tale is fuel venting out of the top of the WUR and into the airbox. Some cars are missing the vent tube, fuel then vents all over the engine which is clearly not a good idea.
I assume you've already checked things like dizzy cap, rotor arm, spark to each plug etc?
It could very well be one of the fuel pumps, or a number of other things. If you are taking it in to be looked at then they will no doubt get to the bottom of it for you.
If you wanted to do some checks yourself then i'm happy to help.
To check your pumps reach behind the fuel head (left hand side) and disconnect the lead there, turn the ignition on and the pumps will run without the engine running, you'll be able to have a good listen to both and it will be pretty obvious if one is shot.
Don't forget to reconnect it though
If you wanted to do some checks yourself then i'm happy to help.
To check your pumps reach behind the fuel head (left hand side) and disconnect the lead there, turn the ignition on and the pumps will run without the engine running, you'll be able to have a good listen to both and it will be pretty obvious if one is shot.
Don't forget to reconnect it though
james.cookson
New member
Hi - had a very similar problem with mine (3.0 ltr 930 - 1975) a year or two ago when I got it back on the road. You'd trickle through traffic fine, but as soon as you got to put your foot down the engine would die and there'd be no power there at all. Turns out it was two problems:-
1) Second fuel pump had seen better days and so could not maintain fuel pressure under higher loads - this got replaced as cost was not that great - diagnosis was via drop off in fuel pressure.
2) Boost overcharge switch was failing and so was not allowing enough boost, this would then cut the earth to the fuel pump at standard boost levels causing the car to die. This was very similar in symptoms to the earlier problem of the failing fuel pump. You can test it very simply by just running the wire into the switch to earth. If with the switch bypassed the problem goes away then you've found the fault - replace the switch (easy job and not expensive) and the problems' cured.
Hopefully you'll find the fault is one of the above and nothing more serious.
Good luck!
1) Second fuel pump had seen better days and so could not maintain fuel pressure under higher loads - this got replaced as cost was not that great - diagnosis was via drop off in fuel pressure.
2) Boost overcharge switch was failing and so was not allowing enough boost, this would then cut the earth to the fuel pump at standard boost levels causing the car to die. This was very similar in symptoms to the earlier problem of the failing fuel pump. You can test it very simply by just running the wire into the switch to earth. If with the switch bypassed the problem goes away then you've found the fault - replace the switch (easy job and not expensive) and the problems' cured.
Hopefully you'll find the fault is one of the above and nothing more serious.
Good luck!
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