Ford Focus Stalling

Asked by Nov 25, 2016 at 02:34 PM about the 2005 Ford Focus ZX4 S

Question type: Maintenance & Repair

This is the third time I've had this type of problem
with my car. When it's going at a constant speed
like on the freeway it's fine, but when I slow down
and I take my foot of the gas like I'm coming to a
red light or a stop sign most of the time it'll stall and
all my lights on my dashboard will come on. Last
time the issue was that there was a cracked pipe
and they fixed it and checked the mass airflow
sensor and said it was fine. It's been about 6
months since then and this just began to happen
again. Has anyone had these issues or know what it
could be?

2 Answers

28,785

Have the DTC (trouble codes) read, as it may be setting one or more, that will give you a big lead on what is happening. You may have a bad IAC (idle air control) valve, which provides air to an engine when idling or at a stop. If you have a vacuum leak, sometimes you can hear or even feel it, inspect around the throttle body for one.

1 of 1 people found this helpful.

I had similar issue and had multiple problems. First the IAC was bad. I quick test is to remove it and see if you can blow air through one of the holes. If you can it is not sealing, you need another one. They should be air tight. I compared it with new one from auto zone. Second, PVC hose under intake manifold had a hole. Replace this. Third one is vacuum lines in intake manifold and fuel pressure sensor were snug there, but a little loose on other end. I had to replace them with 1 size smaller. Blow into vacuum line, if not air tight, then this will also cause that issue. Intake vacuum when down from 3/8 to 5/32. Fuel rail from down to 3/8. Car has not stalled any more.

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