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Matt
Matt, Mechanical Engineer
Category: Kia
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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1.3 kia rio lx full service story engine sometimes falters

Customer Question

1.3 kia rio lx full service history engine sometimes falters using accelerator,also rpm does not drop when changing gear,cable is free
Submitted: 4 months ago.
Category: Kia
Expert:  Shantal-Mod replied 4 months ago.
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Expert:  Matt replied 4 months ago.

Hello

this could be a vacuum leak after the MAF (mass air flow) sensor thats mounted on the air intake pipe

any air pulled in here post meter isn't 'seen' by the ECU and so not compensated for and results in the engine running roughly and hunting as you describe

the best way to locate an air leak is to have the engine running and then spray lighter gas around each possible joint / rubber hose etc post MAF

if there's a leak then the engine will pull the gas in and rev up

now its not as dangerous as it might sound as you need a naked flame or spark to ignite the gas and I've used this method for many years without incident

usually this sort of thing is a cracked or perished rubber vacuum hose, so can be repaired very cheaply

Expert:  Matt replied 4 months ago.

Hi

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