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Old 02-05-2021, 01:10 AM #1
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P0171 & p0300

It's late. I'm tired. I've read through a bunch of threads. I need some help.

I've got a 2000 SR5 5VZFE with Cali emissions, 258K miles. When I went to leave the restaurant tonight, it took considerably longer to start than normal. When she did crank, she was idling really rough. Almost immediately the CEL lit up. I drove it to the office and grabbed the code reader. It popped the P0171 and P0300 codes. When I went to leave the office, it was hard to start again and had a really rough idle.

I drove about 15 miles or so to a coworker's place so I could borrow his truck tonight/tomorrow. I stopped at multiple stop lights. While stopped, it was idling fine. No hesitation when leaving the light. The CEL stayed off.

At Ricardo's place, I tried cranking it after I turned it off. It was hard to start. The code reader shows both the P0171 and P0300 codes as pending.

Thoughts on how best to run down the issue? From what I've read, I'm leaning on the MAF being dirty or bad. Both the A/F and O2 sensors were replaced by me at 213K with Denso units. Fuel pump and filter replaced at 212K. I need to change the filter again, I know, but I haven't gotten there yet.

Thanks in advance for the help!
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Old 02-05-2021, 01:53 AM #2
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Quote:
Originally Posted by lefty556 View Post
It's late. I'm tired. I've read through a bunch of threads. I need some help.

I've got a 2000 SR5 5VZFE with Cali emissions, 258K miles. When I went to leave the restaurant tonight, it took considerably longer to start than normal. When she did crank, she was idling really rough. Almost immediately the CEL lit up. I drove it to the office and grabbed the code reader. It popped the P0171 and P0300 codes. When I went to leave the office, it was hard to start again and had a really rough idle.

I drove about 15 miles or so to a coworker's place so I could borrow his truck tonight/tomorrow. I stopped at multiple stop lights. While stopped, it was idling fine. No hesitation when leaving the light. The CEL stayed off.

At Ricardo's place, I tried cranking it after I turned it off. It was hard to start. The code reader shows both the P0171 and P0300 codes as pending.

Thoughts on how best to run down the issue? From what I've read, I'm leaning on the MAF being dirty or bad. Both the A/F and O2 sensors were replaced by me at 213K with Denso units. Fuel pump and filter replaced at 212K. I need to change the filter again, I know, but I haven't gotten there yet.

Thanks in advance for the help!
Cleaning the maf is always good also check for vacuum leaks cracked hoses and make sure your gas tank cap is tight. basically try to eliminate any unmetered air air getting into the intake..
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Old 02-05-2021, 06:47 AM #3
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Cause of my 0171 was a cracked hose nearest to intake. Couldn't really notice it until separated from intake and pulled apart slightly, then there was a large crack letting air in. Replaced with OEM and like new, purrs like a kitten!

The 0300 is a general misfire, might go away when air intake leak is resolved.
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Old 02-05-2021, 09:12 PM #4
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As said P0171 is more than likely a dirty MAF or vacuum leak. Given that P0300 means two or more cylinders are misfiring, and if it doesn't go away with P0171, I'd start looking at your coil packs/lightning hoses - our vehicles use waste spark ignition so each cylinder is paired with another, and off the bat that already sounds to match the issue. Could even be the sparkies themselves, when were they last replaced? Regardless I'd try and tackle this code second of the two.
To test for vacuum leaks simply spray some carb cleaner around the engine bay and listen for an idle change. It can either increase or decrease (though it will typically increase.) Most the time it's either from a cracked hose or a poor seal around the plenum.
It won't be caused by your AF/O2 sensors, as they throw totally different codes.
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Old 02-05-2021, 11:39 PM #5
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I put on a new MAF and still had the issue. Sprayed some carb cleaner and it decided to act up when the carb cleaner got close to the PCV valve. I replaced the PCV valve and grommet. No joy. Sheís hard to start and wonít idle.

I do have an exhaust leak. Itís leaking at the joint between the cat and the muffler (downstream of the A/F and O2 sensors).

The plugs and wires were replaced last year at 210K, so theyíre probably due to be swapped out since Iím at 258K now.

Fuel pump and fuel filter were replaced at 212K. Both cats were replaced with Walkers at 213K. When I replaced the cats, I replaced the A/F sensor and the O2 sensor with Denso made replacements.
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Old 02-06-2021, 02:36 AM #6
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Quote:
Originally Posted by lefty556 View Post
I put on a new MAF and still had the issue. Sprayed some carb cleaner and it decided to act up when the carb cleaner got close to the PCV valve. I replaced the PCV valve and grommet. No joy. Sheís hard to start and wonít idle.

I do have an exhaust leak. Itís leaking at the joint between the cat and the muffler (downstream of the A/F and O2 sensors).

The plugs and wires were replaced last year at 210K, so theyíre probably due to be swapped out since Iím at 258K now.

Fuel pump and fuel filter were replaced at 212K. Both cats were replaced with Walkers at 213K. When I replaced the cats, I replaced the A/F sensor and the O2 sensor with Denso made replacements.
What brand were the coil packs and wires? I always suggest OEM parts. o2 sensors could be eliminated from the problem if they were replaced.
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Old 02-06-2021, 05:03 AM #7
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P0171 & p0300

Quote:
Originally Posted by lefty556 View Post
I put on a new MAF and still had the issue. Sprayed some carb cleaner and it decided to act up when the carb cleaner got close to the PCV valve. I replaced the PCV valve and grommet. No joy. Sheís hard to start and wonít idle.

I do have an exhaust leak. Itís leaking at the joint between the cat and the muffler (downstream of the A/F and O2 sensors).

The plugs and wires were replaced last year at 210K, so theyíre probably due to be swapped out since Iím at 258K now.

Fuel pump and fuel filter were replaced at 212K. Both cats were replaced with Walkers at 213K. When I replaced the cats, I replaced the A/F sensor and the O2 sensor with Denso made replacements.

Depending on how bad of a vacuum leak it was it may need to relearn itís idle adaptive parameters.

I would make it a priority to fix the exhaust leak.


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Old 02-06-2021, 08:03 PM #8
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Quote:
Originally Posted by 19963.4lsr5 View Post
Depending on how bad of a vacuum leak it was it may need to relearn itís idle adaptive parameters.

I would make it a priority to fix the exhaust leak.


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While I was going to the auto supply for a PCV valve and grommet, I unhooked the battery so that the temporary memory could clear. Like I said, the truck won't idle - it just stalls and dies unless you're on the gas pedal.

The plugs are NGK. I know I went with dual electrodes. I'll have to look at my notes, but I'm pretty sure the wires were NGK as well.
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Old 02-06-2021, 10:46 PM #9
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Quote:
Originally Posted by lefty556 View Post
While I was going to the auto supply for a PCV valve and grommet, I unhooked the battery so that the temporary memory could clear. Like I said, the truck won't idle - it just stalls and dies unless you're on the gas pedal.

The plugs are NGK. I know I went with dual electrodes. I'll have to look at my notes, but I'm pretty sure the wires were NGK as well.

That itís self will wipe the adaptiveís and cause the engine to run on default parameters that may not work on a high milage engine.

Keep it running with throttle and slowly let off the throttle to let the engine try and compensate. If it canít either clean your IAC and try again or do a compression check. A dead cylinder or three will act the same and not want to idle.


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Old 02-09-2021, 01:16 PM #10
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Quote:
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That itís self will wipe the adaptiveís and cause the engine to run on default parameters that may not work on a high milage engine.

Keep it running with throttle and slowly let off the throttle to let the engine try and compensate. If it canít either clean your IAC and try again or do a compression check. A dead cylinder or three will act the same and not want to idle.


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I fixed the exhaust leak last night. After putting the new gasket on, it fired up (took a little longer than normal) and seemed to idle fine. The CEL was on. I let it idle for 20 minutes or so. The CEL went off. I took it out for a test drive, some surface roads, some highway. On the way back to my buddy's place, I stopped and got gas. It was a very hard start, followed by rough idle and a CEL immediately. It drove fine to Ricardo's house, and idled just fine for a few minutes in the garage. I shut it off and pulled the code - still a P0171.

While on the highway, I did manage to get some data.


Idling at stop light:

STFT - 6.3%
LTFT - 39.1%
Calculated Load - 20
RPM - 607

On the highway at 60 MPH:

STFT - 1.6%
LTFT - 39.8%
Calculated Load - 34.1
RPM - 1970

Idling at gas station:

STFT - 4.7%
LTFT - 39.8%
Calculated Load - 15.7
RPM - 692
MAF - .5 lb/min
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Old 02-09-2021, 01:38 PM #11
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The fuel system is running way too rich per the LTFT.

Was the new MAF OEM or at least Denso? Can you get the MAF PID to read in grams per second by chance?

Get the 4Runner up to operating temp, then rev it to around 2000rpms and see what you LTFT values are.
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Old 02-09-2021, 03:23 PM #12
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P0171 & p0300

The fact that your LTFT is the same at idle and at 1970rpm is interesting.

Are you sure you donít have more exhaust leaks?

Or an Intake manifold gasket leak?

Having to add 39% more fuel than what itís thinking is needed to me is more than a small vacuum leak.


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Old 02-09-2021, 04:29 PM #13
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The new MAF was a Denso.

I'm using OBD Fusion on the iPhone along with a bluetooth OBDII reader. I have no clue how to change it to read in g/s vs. lbs/min.

I don't hear any other exhaust leaks, nor can I hear it sucking air for a vacuum leak, but that don't mean much.
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Old 02-09-2021, 06:36 PM #14
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If it was my rig seeing the LTFT at 39% Iíd buy the special banjo bolt and check fuel rail pressure.


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Old 02-09-2021, 07:24 PM #15
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Fuel trims maxed out.

P0171.

New MAF didn't change the issue.

Conclusion: a large vacuum leak! Find the offending hose. Try this technique rather than listening:


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