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Codes P0171, P0174, P0430, P0300

Tiny
PACKERS27
  • MEMBER
  • 2000 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
So bank 1 and 2 is lean. Insufficient something to catalytic converter is p0430 and p0300 is random cylinder misfire.

All plugs and packs have just been changed. I have been told that the bank 1 and 2 being lean is usually caused by a vacuum leak. I have checked I can see under the hood. Is there any vacuum lines elsewhere that is tough to get to that I need to he looking at? Could vacuum lines cause the random misfire? Anyway, thanks!
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Monday, October 8th, 2018 AT 1:41 PM

49 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi and thanks for using 2CarPros.com.

As far as a vacuum leak is concerned, yes to all of your questions. They can cause a lean mixture as well as a random misfire. What I need you to do is use a vacuum gauge to check for leaks. Here is a link that shows how it is done. Also, behind the throttle body, there is a vacuum hose connected near the bottom. If you follow it, you will find a 90 degree elbow. These elbows are known to dry-rot and leak. So, make sure to look for that.

Here is the link:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Check these things and let me know what you find. Also, if you have other questions, let me know.

Take care,
Joe
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Monday, October 8th, 2018 AT 6:52 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
The elbow behind the throttle body that you are talking about, goes to the PCV valve, right? Also, I look into the vacuum thing. Thanks
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Monday, October 8th, 2018 AT 9:16 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
Oh, and when using the vacuum source at the engine, where is the source exactly?
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Monday, October 8th, 2018 AT 9:19 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
All you need to do is fine a vacuum port on the intake or a vacuum line. Any intake vacuum port will work.
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Tuesday, October 9th, 2018 AT 5:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
As far as the PCV, that should be a much bigger hose. You will be looking for a smaller one. However, the PCV can leak just as well.
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Tuesday, October 9th, 2018 AT 5:10 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
  • 2000 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
So bank 1 and 2 is lean. Insufficient something to catalytic converter is p0430 and p0300 is random cylinder misfire.

All plugs and packs have just been changed. I have been told that the bank 1 and 2 being lean is usually caused by a vacuum leak. I have checked I can see under the hood. Is there any vacuum lines elsewhere that is tough to get to that I need to he looking at? Could vacuum lines cause the random misfire? Anyway, thanks!
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Tuesday, October 9th, 2018 AT 5:53 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The 430 is for catalytic converter bank 2. That is the drivers side

171,174 is for long term trim reading high which is lean.

Check

Fuel pressure. Would also cause the 300 code.

Mass air flow sensor. Make sure the connector is clean and tight. Check the hose that goes to the throttle body and see if it is ripped open anywhere.

PCV make sure the valve is not stuck open.

Intake manifold. Common for the intake manifold to warp and leak vacuum. You can verify by a smoke test to see if it is leaking.

Roy
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Tuesday, October 9th, 2018 AT 5:54 PM (Merged)
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
The 430 is interesting to me because the catalytic converters were gutted. But there still seem to be less exhaust coming out of the driver side than passenger side. Could a clog issue this code? If so, how can I find it?

What is the easiest way to check fuel pressure?

Can I use electrical cleaner of the MAF sensor? Is the hose on the TB a vacuum line?

I just replaced the PCV.
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Tuesday, October 9th, 2018 AT 5:54 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If you gutted it then that is why the code is set. There is no cleaning of the gases. It needs to be replaced to turn out the light.

You can rent a fuel pressure tester. You get it at a parts store. There should be a schraeder valve on the fuel rail.

There is no such thing as cleaning a mass air flow sensor. The carbon is burned on the sensor and there is no cleaner that can get it off.

Roy
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Tuesday, October 9th, 2018 AT 5:54 PM (Merged)
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
I got a fuel pressure tester from Harbor Freight. It has a gauge but doesn't have a pump. I put the gauge on the Schrader valve and turn the key on and it never even moved on the gauge. I haven't had any problems with it not starting. It's only when the motor is cold and on the first crank in the morning it idles like crap. As soon as I give it gas or put it in drive to take off then everything Smooths out until I put it in park and it idles in. I remind you this is just when the motor is cold
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Tuesday, October 16th, 2018 AT 1:22 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
After the motor is good and warm then there is no issue with idle. I also did a vacuum test. I just simply put it on a vacuum line and the needle was jumping everywhere but that's because of the idle. It bogs down like it's fixing to quit and then it catches back up and then bogs back down again. It keeps doing that until I give it gas or go to take off
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Tuesday, October 16th, 2018 AT 1:24 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
As for the Schrader valve. I probably didn't get a reading bc my cheap ass harbor freight tester doesnt have any fitting that would release the valve stem to get a reading. I just plugged up the hose that it came with. Is there another way to do a pressure test?
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Tuesday, October 16th, 2018 AT 1:33 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Fuel pressure needs tested at the schrader. The only other way is to disconnect the fuel supply and place a T in it. Then you would still need a pressure gauge to check it.
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Tuesday, October 16th, 2018 AT 5:40 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
Okay, so the fuel pressure checked out as normal. The boot on the back if the throttle body is fine, no holes or anything. I am also getting a p1131 and p1151. This is oxygen sensor problems that are tied into this problem I believe. I also checked manifold and all other vacuum lines with starting fluid. Is there anything else that would cause this? Give me all you got because this completely stumps me
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Friday, November 2nd, 2018 AT 6:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi again.

The 1131 indicates a lean mixture and the computer has maxed it ability to compensate. See pics 1 and 2 for possible causes. The 1151 is the same thing for the opposite bank.

Take a look through the two pics I attached. See if anything clicks with a possible issue.

Also, these engine often times have exhaust manifold leaks. It will sound like a ticking oftentimes. Is that happening?

Let me know.

Joe
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Friday, November 2nd, 2018 AT 5:43 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
What is a VPWR? I know I have an exhaust leak on one side because it is where the doughnut gasket is that bolts the exhaust on to another piece that is kind of near the upstream o2 on the passenger side. How do I find out in the EGR is stuck? What about cam timing? I know I sprayed everything with carburetor cleaner and I have not found anything.
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Friday, November 2nd, 2018 AT 8:05 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
My theory is that when the truck rough idles and stalls from a cold crank, the leak is from the intake manifold. As the truck warms up, it reseals itself. The only thing is the p0171 and p0174 codes stay present.
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Friday, November 2nd, 2018 AT 8:08 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
I am not sure about a ticking sound. Where and when would I hear it?
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Friday, November 2nd, 2018 AT 8:12 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
If the exhaust manifold is leaking, it would be most obvious when starting it and when the engine is cold. The easiest place to hear it from would be the front wheel openings.
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Saturday, November 3rd, 2018 AT 4:00 PM
Tiny
PACKERS27
  • MEMBER
  • 190 POSTS
But just one side leaking would not cause both banks lean I would not think. I am going to attempt to pull off a vacuum line and blow cigar smoke in it to see what happens.
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Saturday, November 3rd, 2018 AT 7:14 PM

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