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Matt
Matt, Mechanical Engineer
Category: Ford
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 1.8 petrol zetec engine in my mondeo.When its cold

Resolved Question:

hi i have a 1.8 petrol zetec engine in my mondeo.When its cold i cant control the revs.It revs off the clock till it comes up to temp.Anmy suggestions?
Submitted: 10 months ago.
Category: Ford
Expert:  Matt replied 10 months ago.

Hello

This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.

As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.

Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattenedpiece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

Matt, Mechanical Engineer
Category: Ford
Satisfied Customers: 21095
Experience: BEng hons Mech engineering, in auto industry 22 years
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Expert:  Matt replied 9 months ago.

Hi

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