My sons 96 3.0 started running a little rough and a little surging the other day. The codes that came up were P1131, P0171, P0174. I don't know a whole lot about this so any help will be greatly appreciated.

 

Wow, i just searched this topic and nobody has commented on this thread after a month, I know p0171 and p0174 are bank 1 and 2 running too lean. There should be a guide somewhere on this there internet that lists all the codes if you haven't solved this already. From what I understand, it means there is either a lack of fuel to both banks, or an excess of un-metered air to both banks, aka, a intake/ vacuum leak after the MAF.

I'm not an expert, which is why I'm searching for solutions myself. And I know my '99 4.0 ohv is a lot different than a '96 3.0, but I would assume the codes have remained the same, and that is the information I've gathered.

 

check your maf, a bad maf can set all of those codes. how many miles?

 

i believe Welcome to CanOBD2! has a code searcher you could use. Not sure if that is the correct website.

 

171 and 174 are lean codes. willing to bet some were in the system there is un metered air coming through and tricking the o2's to say its lean. check everything that is a vacum line or air line espescially around the intake. another thing i have heard with the 3.0 is that the inake gaskets can crack and cause this code.

 

P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P0171 lean code for bank 1
P0174 lean code for bank 2

When were the O2's replaced last?

 

I have the same issue right now with my 03. I thought I found it the other night when I saw a cracked hose out of the EGR valve. Not it. Tried the MAF cleaner today. Not it. Can't find a vacuum leak. Original plugs and wires @ 94000 miles.

 

how likly are both the o2's going to go out at the time....


its more than likckly a vacum/air line cracked

 

I only see the 171 & 174 codes, nothing else. I can't see that many vacuum line on the 3.0 motor.

 

spray the intake down with carb cleaner, see if the idle raises.

 

Did that no luck. Talked to a mechanic buddy about the hose from the PCV to the intake plenum, the hose looks a little collapsed. He suggested replacing it, but the stinking thing is $53 according to Mr Parts man. The parts suppose to be in tomorrow, so I need to take a look at it.

 

if its collapsed its most likely that its sucking air from there.

 

$53 for a 3 inch hose is a little pricey, but it appears you don't have much choice. I'm wondering if it comes attached to the pipe that goes into the intake plenum.

 

i believe the one from ford is redesigned, not sure about the one your getting. the one from ford comes wiht the plastic tube and the elbow.

 

That's what I thought, but the parts guy didn't have a clue. If it does I think I'll have to pull the intake plenum to put it on. Has anyone else replaced this part?

 

if it were me, just take the elbow off and put it on.

 

The elbow has been re-engineered. It's now a hard plastic piece. It's been replaced, but still have the check engine light.

 

whats the code? and is it still ruff/surging?

 

Still the 171 & 174, no other code.

 

have you cleaned the maf?

 

twice

 

whats the fuel pressure look like?

 

Don't know. Don't have that equipment

 

take a water hose without the nozzle and run the water all over the engine to be positive no vacuum leaks.

 

I did the either test