98 Explorer error codes 171 174 305 420 o/d light | Ford Explorer Forums

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98 Explorer error codes 171 174 305 420 o/d light

savo

Member
Joined
March 23, 2006
Messages
19
Reaction score
3
City, State
Schenectady, NY
Year, Model & Trim Level
2014 Ford Edge SEL
Callsign
K2SAV
Let me first apologize for opening a new post, I know most vets hate adding repetition.
But I felt that the previous posts were not very helpful in my situation.
I hope the title is appropriate. I want others to benefit from this aswell.

I am having a problem with my explorer and I find it hard to trust the mechanics in my area.

I have a 98 ford Explorer 2 door Sport
V6 4.0L SOHC VIN - E
with approx. 160,000 Miles

As a note I did use Lucas Fuel Treatment (injector cleaner) about every other tank fill. It really helped with fuel economy. I was using this about 3-4 months ago.
For the past Year I had a K&N Air Panel filter installed. Cleaned every 30K Miles.

Lately I have been having problems with the Transmission and the Idle.

About 2 months ago. I was getting CEL codes of 171 and 174
Fuel/Air mix too lean Bank 1 and Fuel/Air mix too lean Bank 2. Every one says this relates to the O2 Sensors. Also Rough Idle in the morning but doesn't stall.

I haven't had the cash or time (mostly cash) to replace them. But someone did suggest that it also relates to MAF.
So I got a can of MAF Cleaner for Advance Autoparts. That did help for about 03.00 miles. I also removed the K&N panel filter that I had been using. I replaced it with a Fram disposable.


No improvement. So about 1-2 month ago I noticed that my O/D light started to flash at me... This started around the same time that I replaced my muffler and Tail pipe. I checked and there have been no apparent leaks. There are no apparent error codes with the O/d light. Except for P0420 with is mostly pending. Catalyst below Efficacy.

Now this part is strange. The O/D light will stop flashing when I drive in REVERSE for about 10 feet. Stop. Turn off. Turn on drive for about a mile.
It will come back on again in about 70-100 miles of straight driving with out --correction-- using reverse. The O/D and error 420 doesn't APPEAR to be connected.

Now in the mornings with the winter settling in, it will stall if I don't rev the gas. If it does happen to stall about 2-3 times it will put out error 305 Cylinder 5 misfire.
Spark plugs were changed in July by a trusted mechanic (repair shop, certified). (Father’s Recommendation, other side of state)

This morning, error codes are 0171 0174 0305 PD O/D Flash (flash stopped after back out)

I am planning on dropping the cash to replace the O2 Sensors and Cats. What should I start with? I can't change them all at once.

Is there more info that you need? Could I have borked my stuff with the fuel treatment? I have stopped using it. It felt good working on my own vehicle, not a fan of paying labor.
Where is a good starting point?

Thank you all in advance just for reading my plight
 






the codes you are getting seem to point to the upper intake manifold and also the lower intake manifold seals needing replacing, the sealing rings get hard and dont seal well- get the parts from ford and replace them , its a cheep easy fix, just remember this-------The intake manifolds are plastic so do not tighten them too much!

Also remeber to disconect the battery to reset ECU and forget the codes, this should set you right mate- let me know.
H
 






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