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Old Feb 21st, 2005, 10:18   #3
cassell
Member since 1988
 

Last Online: Jun 2nd, 2024 19:57
Join Date: Dec 2003
Location: Middlewich
Default RE: Can anyone help me and my poorly P1800?

Hello Caroline,

I'm assuming that as you state that your car is a 1974, it's a fuel injected 'E' or 'ES' model rather than a carb engine. If I'm wrong, follow the advice already given by Peter, if I'm right, here's a few things to check that may be causing your problem.

You say the car starts OK, runs on choke/idle, but stalls when warm, restarts but runs unevenly, and stalls the minute you touch the throttle?

I would suggest that perhaps one of the following items may be at fault. There is an in line fuel filter under the car adjacent to the tank and electric pump, which if blocked will starve the engine of fuel. It may be letting enough through to start from cold, but not when the throttle is opened. This is the cheapest and easiest thing to try first, about £11 for a new one, but a really messy job!.

There is a cold start valve fitted into the inlet manifold which allows extra fuel to be injected during cold start up and initial running. This should close off when the temperature rises, as it senses water temperature from the engine block, but if it continues to inject, it will 'over fuel or flood the engine causing it to stall. It is possible to isolate this valve to check whether it's still working when it shouldn't be, simply get the engine warm and remove the fuel hose to the valve, plugging the end to prevent fuel soaking you and the car before you start it! I think a new one of these is around £80.

The third suggestion is the electric fuel pump under the car, it may be that yours is worn and not delivering fuel at sufficient pressure to keep the engine running under throttle. These are expensive, so it ought to be your last resort. A genuine Bosch replacement is around £180, but I recall that Brookhouse Volvo in Ipswich can provide a non-genuine equivalent for considerably less.

I hope this information is of some use to you, let us know how you get on with the problem,

Regards,

Paul
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