5.4l engine stuck at 300 rpm!
- Thread starter AccraBob
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- 5.4l rough idle won't rev
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Retiredusps
Full Access Members
Also how did a Bug get past the Air Filter ???? Have them check the air intake system. Should also change the air filter.
OP
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AccraBob
Well-Known Member
Got the truck back already..they did as you said, no need for any parts, just did KAM reset, test drive, and retest afterwards.
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AccraBob
Well-Known Member
Good question. Just drove from NJ to Alaska, stopped for full scheduled service in Minot ND on the way up. Got down to Houston, did full scheduled service on July 11. Presumable air filter was checked both times. We did drive through some intense bug clouds. So it's ironic that it choked on a bug in Texas.
ManUpOrShutUp
Full Access Members
O2 sensor codes are rarely the fault of the actual sensor and you certainly didn't have 2 fails at once. The bug in the MAF just sounds like pure bulls**t. Honestly, I can't even fathom how that would be possible. So with all that air flowing through the intake the bug manages to steer itself out its path and into the sensor? This is a prime example of why I don't visit dealerships once the warranty is up.
Trainmaster
Old School Member
ManUp is speaking sense. The whole story is screwy. And no O2 sensor or mass air sensor's going to lock the throttle at 300 RPM.
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AccraBob
Well-Known Member
Well, run a test. Remove your MAF, cover it with some masking tape, re-install and fire it up. The results would be empirical.
My F150 & my wife's Expedition both have K&N cleanable and reoilable air filters. Can't use too much oil on the filters or it will dirty up the map sensor. As a general rule of thumb i clean our MAF sensors periodically doesn't take rocket science, autozone sells MAF sensor cleaner (only use MAF cleaner on your MAF). IT will save you some money if you will pull out your MAF sensor every so often and spray it let it dry and reinstall. The first time I cleaned the MAF sensor in the expedition it was covered with fine dust that made it through the ford paper filter. Sprayed it and things worked like new and mileage and driveability improved. I live in Texas and have NEVER had a bug on the MAF sensor they all get stuck in the air filter along with oak leaves and pine straw. Good luck. MAF cleaner at AZ $8.99 new MAF sensor at ford around $200.
plumcolr
Full Access Members
Actually sounds logical to me. You can open the throttle but if the MAF doesn't see air flow, the injectors aren't gonna flow more fuel. It will just bog and die.
A similar thing, normal idle speed though, and a rough idle on my crown vic. Stepping on the gas just made it bog. A new MAF fixed it (fortunately my 06 expedition at that time used the same MAF. I swapped it to verify before buying).
I presume the bug was really screwing up the air flow thru the MAF.
A similar thing, normal idle speed though, and a rough idle on my crown vic. Stepping on the gas just made it bog. A new MAF fixed it (fortunately my 06 expedition at that time used the same MAF. I swapped it to verify before buying).
I presume the bug was really screwing up the air flow thru the MAF.
