Car Broken

[Guest s6boy1979]

As a few of you are aware my car died on my on the way to ford fair on saturday on the m40. The car had been driving great for about a week after changeing the fuel pump and getting the mixture set up. On the saturday i was driving along nicely on the m40 at about 75mph when i lost power. Pulled over and the car stalled, it started a few times but stalled straight away them just wouldn't start after that. So called the RAC out and the guy was great, he spent over an hour trying to sort it. We worked out that it is an injector problem as i have a good strong spark and fuel is getting to the fuel rail with good pressure. The problem is that the injectors are getting a very weak powwer feed which he felt is not enough. So after getting towed home i changed the module that is screwed to the inner wing and the ecu with no change, still wont start. I have been told that the engine coolant temperature sensor can cause a problem as it controls the amout of fuel injected depending on the engine temperature. Is this true also is there anything else i can try as well as really need to get this sorted now.

[Guest Gregg]

Here is another article that may help. Maybe this may help....

http://www.aa1car.com/library/2003/us60324.htm

[Paul Grainger]

If the sparks are ok then it has to be a fuel fault.

The power supply to the injectors all come from the fuse box via engine loom connectors located behind the engine on the right as you look at it. The ECU triggers the injectors by switching the earth circuits only, so low voltage could be caused by corrosion in the multiplugs or water leaking onto the fusebox.

More likely is fuel starvation, did you say it has a new fuel filter? make sure it is fitted the correct way round (there should be an arrow on it showing the direction of flow).

you said fuel pressure is ok? It should be 2.5 bar with the vacuum hose on the regulator, and 3 bar with it removed. I would check the flow rate too. To do this remove the return pipe from the regulator and fitt a pipe going to a bottle. Start the engine and see how much fuel comes out the return, there should be enough to fill a milk bottle in about 10 seconds. I would get someone to help you to switch the ening on and off as you do not want to spill fuel. Observe normal fuel handling precutions. If the fuel supply is poor then you could have a damaged fuel line restricting flow. The EFI's were fitted with in tank fuel pumps which is all part of the fuel gauge sender assembely and can be removed to inspect the bag gauze strainer on the end of the pick up. The fuel pump could also be at fault if the supply is not up to scratch. Good luck.