My fiesta was stalling, idling rough after having an AEM cold air intake professionally installed.After checking for air leaks, cleaning my MAF it ran better,
but would surge up to almost 3,000 rpm. I have since replaced the MAF & throttle body, being sure to deplete the PCM for a complete reset. The car isn't stalling anymore, but it's surging constantly when it's warm between 2-3,000rpm. It's throwing the code about incorrect MAF parameters. Any suggestions? The plugs were also replaced, the car has 79k
Thanks
What makes this problem better or worse?
When the engine is up to temperature
How long has your 2011 Ford Fiesta had this problem?
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Hello, anytime you install aftermarket components that relate to performance enhancements, you risk this kind of thing. My suggestion is that someone with a high quality or Ford IDS diagnostic tool analyze all the data to see what is happening when the concerns occur. All the parameters that affect operation should show data that can be checked to find out where to focus your attention.
