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Mark
Mark, Technician
Category: Car
Satisfied Customers: 1504
Experience:  Qualified City & Guilds
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Hi Ive a 1998 Ford Mondeo 2/litre. Consumption is high yes

Resolved Question:

Hi I've a 1998 Ford Mondeo 2/litre. Consumption is high yes I know its a 2/litre but even so I feel it is too high. At normal operating temp the engine idles at 1000rpm I've been told the norm idle rev is 750rpm. I've put additives in the petrol to help clean the various valves of possible carbon build-up but the idle stays at 1000 rpm. Should I replace the ICV? I'm sure the high Idle of 1000 is the cause of the high fuel consumption. To replace the ICV is it a complicated repair? The car has 99000 miles on the clock.
Submitted: 3 years ago.
Category: Car
Expert:  Mark replied 3 years ago.

Mark :

What is your current consumption figure?

Customer:

Hi Mark I've not done a specific observation of fuel consumption but would hazard a guess as 25-30 mpg. This is due to the fact I presently

Customer:

only half fill the tank and on a round trip to a town approx. 15 miles distant am close to empty and I maintain the speed

Customer:

of the vehicle at 50-60mph. This is done in the hope of achieving the best possible consumption. No unnecessary travel in the car is made.

Mark :

It's unlikely the idle speed of 1000 rpm is the cause of what you think is high consumption.

Mark :

It would have to idle for hours.

Customer:

What would you suggest could be the problem?

Mark :

You should check the coolant temperature sensor in case it is registering the engine as being cold when it isn't.

Mark :

Similar to running on choke.

Customer:

Have done that and the temp is operating at required Mnfr spec.

Mark :

Not the temp guage reading.

Mark :

Did you check it with a scan tool?

Customer:

No don't have that equipment.

Mark :

So how do you know the coolant temp sensor is good?

Customer:

Good question I don't.

Mark :

That's where you need to start then.

Mark :

The gauge reading is not the one used by the ecu for engine temp.

Customer:

Thanks will follow your suggestion

Mark :

No problem.

Mark :

Please remember to rate my assistance.

Mark :

Thanks

Mark :

Mark.

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