Revs not fall­ing

Car Mechanics (UK) - - Help! -

I’ve just bought a 55-plate Ford Fi­esta 1.25 16v petrol man­ual with 114,000 miles. The en­gine is as sweet as a nut and has been well ser­viced. How­ever, when­ever I change up a gear, the revs do not fall quickly enough to make a smooth gearchange. I have to wait a cou­ple of sec­onds for the revs to fall be­fore se­lect­ing a higher gear. I have tried chang­ing the plugs and air fil­ter, to no avail. Rus­sell Munn The most likely cause of the revs stay­ing too high when chang­ing gear is that the idle con­trol valve is stick­ing. This can be a com­mon prob­lem on the 1.25 en­gine and I would first try to clean the valve out us­ing a carb cleaner aerosol.

It would also be ad­vis­able to check the in­let man­i­fold and vac­uum pipes for any air leaks, al­though if this were the prob­lem I would ex­pect fur­ther symp­toms to show up. You should also check the wiring loom on the en­gine and in­spect the con­nect­ing plugs to the ICV and TPS. If this does not help, you may need a new idle con­trol valve or throt­tle po­si­tion sen­sor. Us­ing a code reader may high­light the prob­lem and help nar­row the source of the prob­lem.

The idle con­trol valve.

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