When this problem first occured I was under 100k but am now at 104k. After that, I just followed the list. One of the most common trouble codes with the Toyota 4Runner is the P0171 code. Lean code P0171, but the engine is running very rich. Low calculated load readings during a wide-open throttle acceleration can also indicate the mass air flow sensor is faulty.
With Stability Control or without Stability Control. The old part number is 171710D020 or 17171—22030. Also, you can watch the engine load under wide open throttle as it should go about 85 or 90%. The downstream was replaced by me right after buying it as a result if a p0440 I think. I read on RockAuto, under a rebuilt fuel injector description, that someone had the o-rings go bad on fuel injector number 1 for cylinder 1, which caused a poor seal thus too lean.
Engine light came on a couple days ago. What is Intake or Vacuum leak? Don't just visually inspect the vacuum lines. This will not affect the way the engine accelerates. Or, does this mean If I drive more it can be recovered? The brake booster is vacuum assisted and works off of engine vacuum. First, I want to say this is a very common fault code on this engine.
Then it came back on and pulled a code for the o2 sensor. Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. They suggest you run the tank of fuel and cleaner within a week or it will eat fuel lines. The readings were not consistent all the time between the sensors. It's my mom's car I'm working on.
Basic checks under the hood include: is the air filter box properly closed? However, this is not always the case. Don't feel too bad as many shops would not have initially diagnosed it as low fuel pressure, either. Check that sensor is latest part. I took it to auto store to put on computer. Two weeks later the light comes on again.
Three months ago the light comes on, I bring it in and they find code P0171 lean Condition Freeze fame shows very high trim values. Could be the fuel pump? Here are the typical symptoms that something is wrong when you have code P0171. I found no grit this time but it was dirty. Check for voltage on the wires coming from the Engine Control Module. Bank 2 is simply the other bank.
I suppose I'd just replace all the rubber from the intake to the manifold. So it it has a vacuum leak, it will show up at idle or lower engine rpms and usually cause a surging or high idle condition if the vacuum leak is large enough. Tech Tips: If fuel trim readings are high at idle and go down on a free rev, there is a vacuum leak. If anybody has any ideas please let me know. I swapped back to my factory intake and have not seen the code since 2-3 months now. I googled my eyes out, trying everything in sequence of most common cause to least. You can test the mass air flow sensor using a scanner or a voltmeter.
Then the light goes off. I took the sensor out again and looked at it more carefully and realized I had missed some wires inside of the plastic tube like part of the sensor. Hi guys,I've been all over the web forums looking for a solution to my problem. P0171 read out turned up lots of hits. It was funny that the car's O2 readings didn't fluctuate while accelerating or decelerating when we did the test.
I used a denso and it did fix the problem. Check the vehicle for a vacuum leak by spraying carburetor spray around the intake manifold while watching the fuel trim readings. Based on my experience, this condition can be and usually is but not always associated with a performance or rough running condition. Let me know your thoughts on What it might be. In this article I am going to be discussing the 1. It came back on anyway so after a few weeks I took it to the shop and they said it was an error code of P0171.