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FORDPROBE MISSFIRE AT IDLE

NEW PLUGS AIRFILTER DISTRIBUTOR CAP CLEAN FUEL FILTER OK

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  • Ford Master
  • 17,970 Answers

Hi Alan:
Your problem sounds like a sticking IAC (Idle Air Control) valve. It is located under the Throttle Body on your vehicle. You have to remove the Throttle Body to get to it...


FORDPROBE MISSFIRE AT IDLE - 2_9_2012_10_47_34_pm.gif

You can try cleaning it but the problem may come back. The sea foam will not clean it because no fuel goes through the valve, only air.
Additionally, its possibloe that you have a vacuum or intake gasket leak or a secondary ingition missfire. I would first check for correct fuel pressure and inspect fo a vacuum leak. Also, scanned the PCM to know if have some fault code stored.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

Posted on Feb 09, 2012

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Posted on Jan 02, 2017

  • 6982 Answers

SOURCE: running rough, spark plugs, distributor cap, rotor

First thing you need to know is which cylinders are missing. Then, don't forget there is an engine beneath the electronics. Do a quick test with a vacuum gauge and do a compression test. Check the distributor shaft for side play. If everything checks out good, then do electronic component testing. have a code check run (many parts stores do this free) and get a chiltons or haynes manual and follow test procedures in there.
I refrain from giving repair suggestions with problems like yours because people keep changing instead of testing parts. When I work on my vehicles or other peoples cars, I do testing to avoid buying expensive parts that most times won't correct the problem. At this point the most I'd suggest is to clean the mass air flow sensor wires with a Q-tip and carb cleaner...that often helps and is free. If you run into a problem with whatever you find, ask and I'll try to help.
good luck

Posted on Oct 05, 2009

Testimonial: "I followed suggestions, it did helped some what."

csmock132
  • 4669 Answers

SOURCE: 1989 GMC 2500 5.7L - engine surges and stalls at idle. Loses power at cruising speed.

Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.

Posted on Jun 02, 2009

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SOURCE: My 1993 Nissan Sentra GXE

Have you checked your MAF? Sentra's are famous for them having problems, I havent had an issue with mine yet thank god.

Posted on Oct 03, 2008

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SOURCE: Nissan b14 rough idle, black smoke

i have a nissan b-14 idle roughly sometimes cut off when in traffic. any solutions???????

Posted on Dec 01, 2009

  • 77 Answers

SOURCE: 1996 Honda Accord Rough Idle Even After tune up

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

Posted on Mar 05, 2010

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Hello,
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