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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all. I am experiencing serious problems with my Daihatsu Mira Moderna.
It seems to run fine most of the time, but whenever it has been raining or cold (or both) the car will randomly lose power and stall out when it has been running for a while. It almost sounds like one or more of the cylinders isn't firing, the revs drop right down and it stalls.
This seems to be worse when it is low on fuel, but I tried running it with a full tank and it still happens.
The really strange part is that if you turn the engine off and leave it for a short time, when I turn it over it then runs perfectly.
According to online forums this suggests 1) a catalytic converter is plugged. 2) bad fuel pump, 3) clogged fuel pipe, 4) bad ignition coil
I had considered putting a fuel flow indicator on the pipe to see if the fuel flow is dropping when the fault occurs
Does anyone know how to build a "spark detector" or something which reliably logs when each spark plugs fires to see if it is timing/etc related?
was informative, one thing I had not considered is a bad crank sensor if present.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
The obvious thing to check is a partially blocked fuel pipe, or blocked tank breather (usually located in the filler cap).
You could try blowing compressed air back up the fuel line into the tank, using a 12V compressor (tyre inflator) with suitable nozzle (they usually come supplied with one), after removing the fuel cap, to allow pressure to escape.
Coils 'can' develop intermittent faults that only show up as they warm up.
You can get sensors that tell you when leads are conducting (similar to clamp-on AC meters.
(just my initial thoughts- if you post more info I may be able to help further)
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Ugh, oh. Car trouble; better call an exorcist. My VW has been giving me grey hairs over a similiar issue, I feel your pain.
A million different things can cause the engine to behave like this. I'd suggest clearing the fault memory, taking it for a drive and then reading the fault codes again.
My bet is on either a dodgy fuel pump or crank sensor, but that's just a bet.
Registered Member #607
Joined: Tue Mar 27 2007, 10:39AM
Location:
Posts: 64
My money is on ignition. Have you swapped the plugs? Damp and cold suggest plug leads/caps, but when hot suggests coil. Try a damp dispersal spray with sealer. At night, can you see any tracking from the leads to earth? I chased fuel starvation problems for nearly a season as the bike was stalling at 10 000 in 3rd and above. Turned out the turbo was blowing the spark out on two cylinders (one coil) once it was under load. Look for the simple things before you mess with the ECU, fuelling etc. Just a thought.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
If your car has an ECU, the problem MAY be a faulty sensor (possibly lambda sensor). These cars generally run for the first few minutes on preset settings, until they warm up. Then the sensors come into play. Could possibly be mass flow sensor, or loose, split vacuum hoses on the inlet manifold, etc. Could just be a dirty connection on one of the sensors.
They can usually be checked out with a continuity test/Ohm meter, though. Most specifications, etc. should be available on the internet.
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Intermittent failure on car, HV related?
