when car idles the rpms pulse like someone is pumping the gas

60

Asked by Jan 05, 2014 at 05:46 PM about the 2003 Ford Explorer XLT Sport V6

Question type: Maintenance & Repair

I have a 2003 Explorer sport and recently when the car idles the rpms pulse like someone is pumping the gas. the rpms only jump up about 500 and its seems like its getting worse. It pulses about twice a second. any ideas on how to fix it? After a bit it will stall out, ands doesn’t do it till engine warms up then, I can’t even stop at a long light and it will pulse and stall. Tried a new MAF $300 still same. Check engine ilghton, tested, they said 80% chance it was the MAF,

15 Answers

101,365

Sounds like either a dirty/faulty idle air control valve or dirty throttle body.

3 out of 3 people think this is helpful.
17,595

The IAC going out. Idle Air Control valve. These are also known for intake leaks. Using propane or brake cleaner won't find the leak because it is usually the lower intake that can't be picked up by spraying.

4 out of 4 people think this is helpful.
60

I did remove and clean out the Idle air control Valve. as best I could, it didn't seem to make any different. I was just hoping that cleaning it would get better than I would know for sure before spending more.

2 out of 2 people think this is helpful.
101,365

Turn your a/c on. Truck should idle up. With a/c off turn steering wheel all the way to the left. It should idle up. If your truck does not idle up in these cases I would replace the idle air control valve.

3 out of 3 people think this is helpful.
17,595

Usually cleaning doesn't work on Fords and I would recommend motorcraft not aftermarket.

1 out of 1 people think this is helpful.
2,925

bad throttle position sensor.your throttle goes up and down when they go bad it will get worse and start to stall.

5 out of 5 people think this is helpful.
101,365

Good point Colin. I over looked that.

1 out of 1 people think this is helpful.
2,925

to dandyoun,thats what the forum is for, sometimes with different views we get to solve the problem.

3 out of 3 people think this is helpful.
101,365

Agreed.

17,595

I would agree with Colin except for one thing. TPS will set a check engine light on a ford and an IAC won't.

60

Thanks

60

turns out it was an intake manifold leak witch was letting two cylinders run a lean code when vehicle warmed up, then sending wrong info to MAF which was sending wrong fuel info . etc.

4 out of 4 people think this is helpful.
17,595

Glad you found it. I get it right occasionally.

1 out of 1 people think this is helpful.
30

rpm are not working on my 98 ford explorer. sometimes they work but other times the don't. What can be the problem

3 out of 3 people think this is helpful.
10

Same problem here . went to Damions Auto Shop In Sterling Heights MI & was told I needed a new battery & idle motor. the final cost $ 517.61

1 out of 1 people think this is helpful.

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