Engine Management light

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skippy - 12 Sep 2006 17:50 GMT

I have an x reg spacestar 1.8 gdi auto which has a little problem

The engine management light keeps coming on, it has been reset by the
garage 5 times and i have disconnected the battery 8 times just to
clear the same fault.

acording to the garage the code means that the car is over fueling on
braking, when they contacted mitsubishi due to the constant reocurrance
they state a fuel pump problem, but as there is no noticeable effect on
the car and it still accelerates as well as it ever has then i doubt
this very much and at £458.00 i am not prepared to pay this and then
find the fault still exists.

As there is no noticeable problem with driving the car, all i am asking
the group is 2 things really, what else could cause the car to over
fuel on braking and is there an easier way to reset the system apart
from disconnecting the battery everytime, as i can not afford to keep
going and spending £35.00 everytime for a reset.

Like i say i have very very grave doubts that it is the fuel pump. can
any one help me please.

keep up the good work

regards

steve

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jonny - 12 Sep 2006 18:26 GMT

There is no other easy way to reset the management system except by
disconnecting the battery .
What is the fault code number ?

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Stewart DIBBS - 13 Sep 2006 01:38 GMT

I have an x reg spacestar 1.8 gdi auto which has a little problem

> ...according to the garage the code means that the car is over fueling on

braking...

I have no direct experience with the diesels, but here's my $0.02.

The CODE indicates this is the case, and its probably true. "Over fueling"
AFAIK means that too much fuel is getting into the engine. There are
however other reasons than an expensive fuel pump that can cause this.

Fuel gets into the engine from the injectors, which are controlled by the
ECU, and they meter fuel from the fuel rail pressurised by the fuel pump.
Under braking the ECU SHOULD be switching off (or reducing) the injector
cycle.

I'd have the garage check the injectors for dirt and / or leakage, and give
them a good clean up. If one or more injectors is leaking despite being
turned off, there's the source of the over fueling.

Also verify the fuel pressure at the injector rail. Fuel pumps almost never
provide too much pressure, as failure modes are usually less or no pressure.

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Stewart DIBBS
www.pixcl.com/lancerproject.htm

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simpleton - 13 Sep 2006 02:30 GMT

What Stewart mentions is called "coasting fuel cut" .

I don't know anything about the direct injection system (gdi) but in the
multi-EFI set up the injectors close on decelleration.

I'd look for a mechanic more familliar with GDI

From what I've pulled up on google, that is one crazy motor. the fuel pump
is computer controlled with pressures as high as 750psi, the injectors are
dual-mode and it will lean burn at 40:1!

http://www.designnews.com/article/CA109943.html

> I have an x reg spacestar 1.8 gdi auto which has a little problem
>> ...according to the garage the code means that the car is over fueling on
[quoted text clipped - 18 lines]
> never provide too much pressure, as failure modes are usually less or no
> pressure.

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