Going slow while pushing the gas pedal

Tiny
J.SHUFORD87
  • MEMBER
  • 2001 MAZDA MPV
  • 6 CYL
  • 74,000 MILES
What does it mean when pushing the gas pedal but not going anywhere? I was on I-76 and I was pushing the gas pedal but was going extremely slow, but when I pushed further down on the gas pedal then the speed picked up a bit but, also when I was going 40+ miles on interstate from time to time it started to slow down on its own while my foot was still on the gas pedal.
Wednesday, August 7th, 2019 AT 7:03 PM

11 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

This could be a number of things but first thing we need to do is check for codes.

If there are codes that will help us figure this out. Here are a couple of guides that gives more detail:

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

With the info that you provided, I would suspect you have a mass air flow meter issues.

Let me know if there are codes and we can go from there. Thanks
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Thursday, August 8th, 2019 AT 3:36 PM
Tiny
J.SHUFORD87
  • MEMBER
  • 7 POSTS
These are the codes I got from AutoZone:

P0174 System Too Lean (Bank 2)
P0051 HO2S Hester Control Circuit Low (Bank 2, Sensor 1)
P0300 Random Misfire Detected
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Thursday, October 17th, 2019 AT 12:45 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay, more than likely the o2 sensor is the issue. Before we get into testing these different systems, I would just swap the upstream o2 sensors from side to side. Once you swap them, clear the codes and drive it again and see if the codes switch to Bank 1. If they do then we need to replace the o2 sensor.

Clearly we can test them but this way is so much easier and definitive. Let me know if you have questions.

Here is a guide that talks about lean misfire:

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers
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Thursday, October 17th, 2019 AT 4:54 PM
Tiny
J.SHUFORD87
  • MEMBER
  • 7 POSTS
All O2 sensors was replaced. I had the last one replace today and I was also told that, that probably was the cause (I don’t think so). It still does it. Yesterday was a little worse like it was actually trying to cut off but still push the gas takes a little time to speed up. It’s like hesitates. I asked the mechanic could the mass airflow sensor be the cause of that problem he said it could that or the O2 sensor.
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Thursday, October 17th, 2019 AT 5:01 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Yes. The MAF could cause this but you had codes that pointed to the o2 sensors. Has it acted up since all the sensors have been replaced? Also, when were those codes taken? Was it before the first sensors were replaced? If so, which sensor did they replace at that point?
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Thursday, October 17th, 2019 AT 5:59 PM
Tiny
J.SHUFORD87
  • MEMBER
  • 7 POSTS
It was scanned after three (left, right and back) were put on which was like March or beginning of April. Then in the end of July beginning of August is when it started this; I push the gas pedal and not really going anywhere that’s when I had first sent a message on here I had went and tried to get it scanned but there scanners wasn’t working. Then I finally got it done like a week or so later. Today the last one which was the O2 oxygen sensor front center downstream (right in front of the engine). That one actually was stuck on and had to be heated up to be taken off. I drove it home parked it then I had came out to get my son and it was still doing it.
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Thursday, October 17th, 2019 AT 6:41 PM
Tiny
J.SHUFORD87
  • MEMBER
  • 7 POSTS
I got this done today:
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Friday, October 18th, 2019 AT 6:19 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay, so if I understand this, you had three sensors replaced and then a few months later is when you started having this issue? Now you have an o2 sensor code for the bank 2 sensor 1 and you just replaced one of the downstream sensors?

If this is the case, then what you just replaced doesn't address the bank 2 sensor 1 (Upstream) sensor. I suspect that the sensor that you replaced back in April has gone bad. Basically you have a Bank 2 sensor 1 code that you need to address.

Let me know if I am missing something. Thanks
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Friday, October 18th, 2019 AT 6:19 PM
Tiny
J.SHUFORD87
  • MEMBER
  • 7 POSTS
I do no know. I’m trying to understand. Would it matter if it was a California emission or non California emissions part? Mines is supposed to be with California emissions but that maybe a sensor that’s without California emissions maybe that is why it went bad quick?
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Tuesday, October 22nd, 2019 AT 10:56 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
No. These parts are going to be the same. It is the programming and in some cases there is an addition of an air pump or other components to help with emissions. However, the o2 sensors will be the same.

I would suggest trying to call who replaced the o2 sensors and find out if this one was replaced. I assume it was and if so, then either you either have an issue in the wiring of that sensor or possibly the control module. However, I suspect the sensor just failed. Unfortunately, these replacement parts are not of the best quality so it is not surprising when one fails.
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Tuesday, October 22nd, 2019 AT 5:43 PM
Tiny
J.SHUFORD87
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  • 7 POSTS
Okay. Thank you very much!
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Tuesday, October 22nd, 2019 AT 7:15 PM

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