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Old 06-06-2013, 01:17 PM   #1
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So lost with these problems!

Cars idle is hanging up around 15-2k when I'm coming to a stop or rev my engine. Im hearing a kind of popping sound from the passenger rear of the engine, cars running pretty rough too. I changed the MAF. Cleaned IAC put in a new filter (over oiled the old one) also changed the fuel filter any ideas?
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Old 06-06-2013, 01:24 PM   #2
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Bad O2 sensors?
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Old 06-06-2013, 01:36 PM   #3
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Bad 02s can cause this? I had this problem for awhile now! I also put in an O/R H while i still had the problem. ( had a catted H)
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Old 06-06-2013, 02:00 PM   #4
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I would check the front O2s, they are what tells the computer the appropriate A/F ratio. If they are bad then it will cause your car to run really rough and will cause your mpgs to suffer.
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Old 06-06-2013, 02:25 PM   #5
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I would check the front O2s, they are what tells the computer the appropriate A/F ratio. If they are bad then it will cause your car to run really rough and will cause your mpgs to suffer.
+1
Front O2s screw it all up.
Check your IAC and see if it's clogged. Open the throttle blade and see if there's crap in your throttle body.
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Old 06-06-2013, 07:40 PM   #6
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It could be the O2 sensors, however test the IAC also to make sure it is behaving as it should--here is how to test the IAC. Note that Ford says it cannot be cleaned, that has been my experience too, if it is misbehaving just replace it and be done.

The O2 sensors can be bench tested with a propane torch and multimeter--here is how to do that...
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Old 06-07-2013, 08:13 AM   #7
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Vacuum leak in the area where you hear the noise. Maybe a intake manifold gasket is bad. Does it sound like popcorn popping? I had bad intake gaskets in mine and the rpm's hung around 4K sounded like crap and didn't want to idle.
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Old 06-09-2013, 07:43 PM   #8
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Intake manifold is leaking or sucking in air one or the other! But how can i fix this? Did i not tighten it enough?, i swapped it out in february.
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Old 06-09-2013, 08:43 PM   #9
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Pull it, inspect it and re-install with new gaskets if its good. You should know if you tightened it enough since you should have used a torque wrench and installed it using the correct torque pattern/values. If you didn't do this, that's why its leaking and you need to go get a chilton's or just find an online guide.
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Old 06-10-2013, 06:39 PM   #10
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Pull it, inspect it and re-install with new gaskets if its good. You should know if you tightened it enough since you should have used a torque wrench and installed it using the correct torque pattern/values. If you didn't do this, that's why its leaking and you need to go get a chilton's or just find an online guide.
Didn't torque it, i just pulled it out but on the way out i only had half a TB gasket i think thats the problem intake manifold looks fine.. It wasn't leaking or anything i was told its sucking air or something
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Old 06-10-2013, 07:09 PM   #11
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Not torquing the intake manifold properly and in proper sequence is a HUGE no-no.

To everyone here: If you do not have a good torque wrench in your tool box and you do more than change your oil/do your brakes GO GET A TORQUE WRENCH! Heck even doing brakes some ppl use them although I do German torque the brakes when I do them lol.
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Old 06-11-2013, 10:33 AM   #12
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Not torquing the intake manifold properly and in proper sequence is a HUGE no-no.

To everyone here: If you do not have a good torque wrench in your tool box and you do more than change your oil/do your brakes GO GET A TORQUE WRENCH! Heck even doing brakes some ppl use them although I do German torque the brakes when I do them lol.
Did i mess it up not torquing it ? Or just reinstall it?
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Old 06-11-2013, 11:30 AM   #13
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Did i mess it up not torquing it ? Or just reinstall it?
It would be best to loosen all the bolts and torque them properly--this is done so as to evenly distribute clamping stress on the plastic manifold:

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Old 06-11-2013, 12:26 PM   #14
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It would be best to loosen all the bolts and torque them properly--this is done so as to evenly distribute clamping stress on the plastic manifold:
Thanks! I already took it off and im having it checked if its warped i might have tightened then to much so ill find out thanks alot
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Old 06-11-2013, 07:51 PM   #15
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Just did everything and now the car wont start it sounds like somethings blocking it from the starter it wont even turn over
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Old 06-11-2013, 09:24 PM   #16
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