Hi, I'm new and need some assistance from you guys n gals.

I have a 2003 Focus 1.4 that doesn't seem to want to idle. It's hunting all the time and frequently when pulling up at a junction will stall.

So far, I've changed the Idle Speed Control Valve and the 3 way breather hose behing the inlet manifold as it did have a slight split in it. Also put new plugs in. Its running better than it was but still not right. There's no mass air flow sensor on mine so I can't change that. When its running, it seems fine.

Its had a diagnostic but hasn't shown any fault codes. Last year it needed a new cat and o2 sensor (engine light came on).

Any suggestions on what to look for next??

Cheers in advance.

 

Sorry cant help but i had same issues i also changed tps and speedometer sensor still same sold car now 3 different garages couldn't resolve this contemplated going fords but knew theyd change absolutely everything till its fixed and charge me!

WES

 

As above TPS and throttle body take a look at and also make sure everything seals properly as it could be an air leak.

 

A quick update. After replacing the bits (breather pipe and plugs) and found it still not running right, I disconnected the battery and let the ECU reset. Once I started it up and let it idle (which it did) for about 10 minutes, it appears to be running fine. No stalling, idles about 750rpm though I've noticed something else!!

The speedo jumps occasionally and when it does, the radio gets louder for a second or two. Any thoughts? It's not a big issue - the main one was getting it to run without stalling! But I thought I'd ask.

 

some radios have a setting to get louder as the speed increases! may be that is set?