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2009 focus idles rough when it rains or after going to car wash. The code indicates throttle body sensor, but mechanic says he doesn't think that is the problem.

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I don't think it is either--- that is high & dry

Check the abs connector next to module or
something closer to the ground for water intrusion

Posted on Nov 29, 2012


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Posted on Jan 02, 2017

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SOURCE: Hard start, rough idle, some black smoke, engine service light on

A scan for trouble codes may point you in the right direction quickly, rather than hit & miss, with replacing parts. Some of the autoparts stores will scan for free, and your right where you need to be to get the right part at the same time.

Posted on Mar 04, 2009

66 chrgr
  • 1011 Answers

SOURCE: 1999 S10 Blazer 2WD 4.3L V6. Starts hard, idles rough.

you have a single injector under the intake plenum it has 6 branching fuel leads off of this.A very common problem is the regulator attached to this and it leak off fuel which falls into the intake .causing this problem. it needs to be replaced .i have done at least 80 of these in my career.this will fix your problem.thanks for choosing fix ya

Posted on Mar 04, 2009

  • 16 Answers

SOURCE: Dear readers, I am having a problem with a rough

It could be your MAF Mass Air Flow Sensor a bad resistor inside the sensor can cause a rough idle(MAF measures the air going into your engine and can cause many problems.) On top of that you should also check your EGR Exhaust Gas Release/Recirculation Valve that can also cause a rough idle(EGR Releases/Recirculates Exhaust gases into certain cylinders to cool them down and bring the engine temp. down or up(with restriction of exhaust Gases) but can cause a rough idle, Possibly just need to Clean you IAC EGR and MAF and you should be all set.

Posted on Jul 20, 2009

  • 6982 Answers

SOURCE: 1998 Jeep grand Cheroke hard cranking, sputtering, rough idling

In READING what you wrote, it appears that your car is difficult to start and pretty much is rough while running....It also appears that your are randomly replacing parts...How did you verify that the parts your have replaced had failed? I suggest you get a basic manual like chiltons or haynes as well as a decent digital volt/ohmeter, then do some testing. Pay close attention to map sensor test and manifold air temp. Having a good fuel pump does not insure that your injectors are clean enough to deliver a good spray pattern This will not show up on any need to actually look at them. There are other items to look at but I think you will likely find your problem in what i mentioned. (you already checked for vacuum leaks, right?)
Good luck!

Posted on Jul 27, 2009

  • 11896 Answers

SOURCE: idle control and throttle position sensor

It could be both. You can test both with an ohmmeter. Missfire is usually do to faulty plug wire or bad plug. If not idling correct, then the idle control valve or 02 sensor is faulty. If missfiring or popping during acceleration would indicate faulty throttle position sensor.

Posted on Sep 30, 2009

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Rough idle, parts store said emissions. what needs checked?

Vacuum lines. And check for residue buildup preventing throttle body from closing .

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Revs high

If the idle speed is normal until you shift into a gear, the idle air control valve is probably raising the idle speed. Try unplugging the iac motor at idle then shift into drive.
If the IAC is raising the RPM the computer controls it, so for some reason the computer thinks the RPM needs to go up. I am assuming you do not have a check engine light on or you would have checked for trouble codes.
Just for the record, I am showing the same IAC for both transmissions on a 2.0 engine code 3.
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My 2009 ford focus stalls when it rains, while car is in motion. Device engine code says throttle body plate is stuck. The mechanic says the computer is getting wet and needs to be replaced. Which one is...

Find a real mechanic , yours is a hack. How could replacing your computer keep it from getting wet? If it is getting wet now the new one will get wet also. I dont recommend throwing parts at a car in hope of fixing it but a throttle position sensor is alot cheaper than a computer. Get the sensor from the dealership not a cheap one at the parts store they are a matter of fact if you can afford it, the mechanics at the dealer could help you better than most other garage mechanics.

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First try cleaning the throttle body,make sure you take it off the intake manifold so that the rear side gets cleaned as well. While doing the cleaning, disconnect the battery so that the PCM will reset and relearn to the freshly cleaned throttle body.

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92 oldsmobile 88 royale check engine code 55

Check the Mass Air Flow Sensor, you can get a can of cleaner specific for cleaning them for a couple bucks at the parts store. I'd just get 1 and clean the sensor see if that works. The MAF sensor is either in the throttle body itself (bolted on from the outside or in the air line between the filter and throttle body. That could be the whole problem right there. Good luck.

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Take it to a qualified repair shop , Thinking ??? Also was thinking the MAF sensor or Intake Air sensor might be faulty . TESTING IS THE WAY TO A PROPER FIX !!!!!

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The check engine light is on and the car is idling high and jerking while stopped?Does anyone know whats wrong with it. I have a 2009 chevy hhr. Thanks

No one is going to know what is wrong with it. You must find out why the engine light is on. The PCM has detected a fault in one or more of its systems. In order to know what the fault may be you must retrieve the codes stored in it. Most auto part stores will hook up a generic OBD II code reader for free. But since its an 09, it should be under warranty. If you tinker with it, can't fix it so then take it to the dealer, they may deny your warranty claim because you worked on it first.

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Check engine light blinking and car running rough, feels like it's going to stall but it doesn't.

If the check engine light is blinking it usually indicates there is a misfire. If the RPMs are low I would suspect a vacuum leak. It is very common for the vacuum tube neat the throttle body to become dislodged and cause the symptoms you described.

If you don't see any vacuum leaks the best first step would be to scan the computer for codes and then focus your attention on those codes.

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Change the fuel filter and drive it about 30 miles. it should reset the codes to normal.

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