Yea mine had these codes when I first bought it. Like said the culprit was the elbow behind the throttle body. I bought 2 hoses from Ford and the rough idle went away and got better MPG.
You can drive it forever with those codes and have no major drivability issues.
PO171 PO174 are intake leaks. Check the PCV hoses that come off the valve covers to the intake. They usually rot at the rubber elbows and throw off the MAF sensor setting a code.
Usually on a mild day like 80* low humidity low side is around 40 psi and high side is 150 psi going from experience. with your environment the numbers should be higher and as stated above did you do a system vacuum? If not that could be an issue since you will have air in the system. Then you...
Wow that came out pretty clean looking. On another forum I'm on people do this to Jeep Cherokee's also
But I like the Expedition version better because it's got a full frame so the structure of the body is not compromised.
Any pointers to get it to get more stations? The FM works fine but the AM band barely picks up 2 stations. This is the factory Ford radio in my 97 Expedition.
I know it's not my area cause my 99 Escort has great AM signal on a stock Ford radio.
Could it be a bad ground or something?
Thanks in...
Search my threads. This may help.
I'd give you a link but it's kinda hard to on a phone.
This thread explains how common PCV hoses rot and cause symptoms like yours.
This is a 5.4L right? I don't see what the exhaust manifold has anything to do with it misfiring.
Did they print out a diagnostic sheet for you?
I know it's common for the manifolds to leak at the back of the heads but I'm not buying its causing your misfire.
I have this exact issue with the rear driverside door. I'd like to fix it since the kids aways have to pile out of the passenger side when I drop them off.
Did all of mine. It took about 40 minutes being experienced with 5.4's.
Remove all the coils then blow the holes out with compressed air because they collect dirt.
Then get to work with extensions and swivels.
You guys know of any way to make the dome lights shut off after a minute of leaving a door open?
If not then I'll figure out how to switch it. I know on some fords you can put in a "code" to activate something like cycling key switch and such.
97 expedition 5.4 4x4.
Thank you Sir.
The leak causes a misreading with the mass air flow. Thus resulting rough idle and codes.
I've noticed it's runs much smoother and actually gained better mpg.
I did not take numbers on the gain but I've noticed it's using less with my routine driving.
Do a compression check on that hole. If its any less than 100psi then you will have to do a leak down test to see where it's going.
Make sure it's on compression stroke for the 2nd test.
Alright instead of starting a new thread I'm bringing this back to life.
Anybody have a link to a electric radiator fan that will pretty much replace the stock mechanical fan and work as good or better and pretty much bolt right in?
I want to get rid of the drag because I use this on the...
97 Expedition 5.4L
Codes PO171 and PO174 common fix.
On the back of the intake there is a pcv hose that runs from there to the passenger side valve cover Ford part # F75Z-6C324JA
It usually go's bad at the elbow.
Just thought I'd throw this up for the search function.
Pics of old to new. And...
My trailing arms are rusted also. I'd recommend just replace them since they are already made out of thin material or just step it up and get some beef aftermarkets.
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