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Category: Australia Car
Satisfied Customers: 88
Experience:  proprietor at port steering & alignment
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Have an au ute dual fuel car starts and idles fine both

Customer Question

have an au ute dual fuel car starts and idles fine both fuels when driven it seems to surge and cough splutter wont run if you plant foot it accelerates fine but will not hold constant speed weather on gas or petrol when switched on gas it seems to also be using lots of petrol lots of black exhaust fume have replaced fuel pump o2 sensor pcv valve am at a loss any help would be appreciated
JA: Have you located all of the vehicle's oxygen sensors? Are the wires leading to and from each intact and in good shape?
Customer: only found 1 o2 sensor at rear of exhaust manifold and replaced with new wires look fine
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: car spent week at mechanics replaced full exhaust o2 sensor pcv valve and fuel pump
JA: Anything else you want the mechanic to know before I connect you?
Customer: help
Submitted: 1 year ago.
Category: Australia Car
Expert:  discostew replied 1 year ago.

Hi au ute , high fuel consumption / surging falcon ? is a fairly common problem on the ohc falcon 6 (from ea to au/ba) i'll assume its a 4lt / 6 cyl , your problem will most likley be temperature . these things love to jamb the thermostat open & will run cold , when i say cold its only about 20 deg , temp gauge needle should be between r & m of normal on the gauge, below r its way too cold , engine management sees low temp = more fuel , for best results use a genuine thermostat , use demineralised water & use the correct coolant at the correct dilution ratio , cheers stew