LOW POWER SLUGGISH ACCELERATION

341 Views 7 Replies 5 Participants Last post by Rebound, 11 d ago

davide46

Discussion Starter · 14 d ago

Hi guys,

Got my car's fault codes read today (see images below)

My biggest issues are a sluggish acceleration, low power and low mpg,

I googled those codes and found some info pointing to the CCV,

Do you guys have any idea?

Thanks,

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taz.

· #2 · 14 d ago

Did the guy erase and read again? Some of them might be old stored codes.
I would do a smoke test to rule out any vacuum leaks( google if you don't know what that is)
If vacuum leaks are present, they have to be fixed.
Once the vacuum leaks are fixed and the fuel trims(google again if you don't know what they are) have settled, you should focus on the mass air flow error if the error is still present after that.
That could be the main cause of sluggish acceleration and low power.
Low mpg can be caused by the mass air flow sensor and vacuum leaks.

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mattmar1

· #3 · 14 d ago

yes always clear codes and see what returns. pretty much what is stated in post #2. can you get the fuel trim live data and post it on here?

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Aristoc

· #4 · 14 d ago

How about vanos?

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taz.

· #5 · 14 d ago

Aristoc said:
How about vanos?

First, we tackle code related, that the non code related.

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davide46

Discussion Starter · #6 · 13 d ago

taz. said:
Did the guy erase and read again? Some of them might be old stored codes.
I would do a smoke test to rule out any vacuum leaks( google if you don't know what that is)
If vacuum leaks are present, they have to be fixed.
Once the vacuum leaks are fixed and the fuel trims(google again if you don't know what they are) have settled, you should focus on the mass air flow error if the error is still present after that.
That could be the main cause of sluggish acceleration and low power.
Low mpg can be caused by the mass air flow sensor and vacuum leaks.

Sent from my SM-G986B using Tapatalk

Yes codes were cleared, all came back after a 2min drive except for the Mass airflow.

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davide46

Discussion Starter · #7 · 13 d ago

mattmar1 said:
yes always clear codes and see what returns. pretty much what is stated in post #2. can you get the fuel trim live data and post it on here?

I'll see if the guy who scanned can do that.

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Rebound

· #8 · 11 d ago

That is a lot of errors. It’s difficult to know where to begin. Ok, where I’d begin is by being certain that all of those codes were cleared. Then log codes that cannot clear, then codes which appear as soon as you start the engine, what appears after 5 minutes of idling, and what appears after ten minutes of driving. This may begin to form a picture.

With three cylinders misfiring, you are definitely going to have fuel trim and O2 sensor errors. But it’s curious that you would have three cylinder misfires. It may be that they’ve all fouled, or it may be that one is bad, and this causes a boosted long term fuel trim which is causing the others to misfire.

Or, you have a vacuum leak. Definitely a possibility and that’s why someone recommended a smoke test, which can reveal a leak. The other possibility is the Mass Airflow (MAF) sensor or the wiring to the MAF sensor. It gets very expensive to buy these non-returnable electronic components and just try them, and if the smoke test reveals a vacuum leak, that could be the cause of your MAF error, which in turn is causing the fuel trim errors.

It all of these errors return, then you have more than one problem with your car. There’s at least one engine-related problem, but you also have problems with your lighting and airbags which are unrelated.

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