QUOTE(Huey_nee @ Dec 9 2013, 05:35 PM)
My Saga LMST (year 2007) has been sucking up the fuel like a thirsty bear recently. The problem came after the engine started to 'buat hal'. After switch off, the engine would not stop immediately, instead shake for few more seconds only stop. From then on, fuel consumption became very high, from 14km/L to 8km/L. Switched from Shell to Caltex, and sent the car to workshop, service and tuning auto choke, everything back to normal with slightly high rpm, and fuel consumption for the recent tank is 11.4km/L.
I have few concerns:
1) Is 11.4km/L consider ok? 90% city drive. I don't want to sound silly to go back to the workshop, though if the high rpm persist I might need to send back.
2) The fuel capacity for LMST is 45 L right? There's one time I refuel, the fuel insert until 45.12L but the gun didn't stop or anything! I suspect it's the gun's problem. That tank only lasted me 430km (before repair)
1. 11.4km/L is good on a 1.3 (underpowered) manual in the city. I would love to know how you used to get 14km/L. That is really good for the 1.3. the 1.5 magma iswaras can do that with no problem. But the 1.3 is severely underpowered thus making good consumption hard to achieve.
2. On a totally dry tank, you should be able to squeeze in like 46L++. The tank may be 45. But you got your filling port and piping etc. That more than a liter right there.
Notes:
Car still running after you swith off your key means your engine is self combusting the fuel. That could happen under 4 scenarios.
1. Your compression ratio is too high (not possible)
2. Your engine is too hot (is your cooling system working?)
3. You got contaminated fuel in your tank (think kerosene etc) - most likely
4. Your spark plugs are so fouled and carbonized that they have become glow plugs of sorts providing a combustion source even when the spark has been cut off. (when did you last change your sparkplugs? are you losing engine oil?)
Petrol engines use spark plugs to combust each stroke as the compression ratio does not allow the fuel-air mixture to reach self combustion conditions (diesel engines do this...they do not have spark plugs)
The 1.3 manual is a carburatted engine. All carburatted engines have a little reservoir of fuel in the carburettor. So if your engine keeps combusting on each stroke even when the key is turned off (no more spark plugs, fuel cut-off solenoid is closed) the engine will keep running and sucking in fuel from this tiny reservoir until it is dry.
They shop may have said its the auto choke. I have heard of this before. But usually you have to change the bimetallic strips if the autochoke goes bust.
Have the engine advance checked. It usually doesnt run out but having it checked out every 50,000km is a good practice. If this is out, your consumption will be quite significantly affected.
This post has been edited by neosaint99: Jan 18 2014, 11:23 PM 
Nov 11 2013, 12:48 AM
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