Civic 8th Gen, Extremely Bad Short Term Fuel Trim! Need Help!

Honda

civic

fuel

pakistan

Tags: #<Tag:0x00000008d7a6d8> #<Tag:0x00000008d7a598> #<Tag:0x00000008d7a430>

syednayl (Syed Nayl) 2023-07-04 21:58:21 +0500 #21

Thanks, I will update you guys. Thank you for all the help everyone !

I will change the oil aswell, but the oil in its current state doesn't seem fuel rich.

pwuser16074435879 (Zarnain) 2023-07-05 00:15:09 +0500 #22

Kia app btaye ge k kon c obd2 ki Application use kar rahy hai?

Jis main long fuel trim b show hota hai

pwuser149994783721 (Pakwheels User) 2023-07-07 12:06:36 +0500 #23

Whats the normal value of o2 sensor,sftrm and lftrm
My sftrm was 0.9said its normal so didnt checked any further..so oxygen sensor value should be 0 ..there are two oxygen sensor one before cat and other aftr cat converter
Value for both

pwuser152550869888 (Pakwheels User) 2023-07-19 12:38:14 +0500 #24

I am facing the same issue in my two civics, 2009 and 2010. Is it a manufacturing issue?

k4fari (Farrukh Ayub) 2023-07-19 12:46:21 +0500 #25

Have you been able to fix Negative STFT? I have the same STFT in my civic 2010. As soon as i remove the dip stick, the engine load goes back to 28-30% from 36-38% and fuel trims to -3 to -4 from -14 to 16%. I have replaced the cat (installed a kabi) , brand new plugs, fuel injectors , pcv, ect, done the valve clearance and throttle cleaning but no luck at all ️

k4fari (Farrukh Ayub) 2023-07-19 14:35:27 +0500 #26

For a reference i am sharing a screenshot of my civic at idle.

m.zarnain.ali (Zarnian Ali) 2023-07-19 17:07:08 +0500 #27

My Civic 2010 Auto has exactly the same problem as yours.
There is no cat inside, instead, there is some type of Jali is welded.
Do you have access to Long Term Fuel Trim?
Is there any smoke with Blow-by?

If you found any solution kindly post.

k4fari (Farrukh Ayub) 2023-07-19 18:26:28 +0500 #28

I think PKDM civic ecu doesn't support LTFT. If you are asking about my civic blow-by smoke, then there isn't any kind of smoke or whatsoever.

k4fari (Farrukh Ayub) 2023-07-20 17:15:44 +0500 #29

Bump

syednayl (Syed Nayl) 2023-07-21 00:30:05 +0500 #30

I wasn't able to figure it out, PKDM Civic do have LTFT but cheap ELM chips cant catch it for some reason.

This is the one issue that has puzzled me.

k4fari (Farrukh Ayub) 2023-07-21 05:34:25 +0500 #31

I have tried think diag beside my own ELM 327, but wasn't able to read LTFT, may be HDS can read the PID of LTFT.

Xulfiqar (Xulfiqar) 2023-07-21 05:46:41 +0500 #32

Get hold of a real scanner that can pull the data. You probably have a duff sensor or a murdered maf (specially if it was drowned in cleaner a lot)

k4fari (Farrukh Ayub) 2023-07-21 16:46:59 +0500 #33

Yesterday i cleaned the MAF with carb cleaner with just a small mist. After that the STFT were settled on -3 to -4 on idle, parked the car overnight and today's morning the STFT are back to -13 to -17. ️

syednayl (Syed Nayl) 2023-07-21 23:29:13 +0500 #34

I do have a real scanner & I can see the LTFT, I meant I cant figure out the FT issue.

I will have a look at the MAF. Could be the issue.

Xulfiqar (Xulfiqar) 2023-07-22 00:35:29 +0500 #35

how many times has that MAF been washed?

Xulfiqar (Xulfiqar) 2023-07-22 00:36:33 +0500 #36

Log the MAF and AFR sensor on 2nd gear pull at WOT, dont let it shift if auto. You should see a strong reading from both.

k4fari (Farrukh Ayub) 2023-07-22 07:39:05 +0500 #37

8 to 10 times (in 4 years) since i have this civic.

Xulfiqar (Xulfiqar) 2023-07-22 10:06:26 +0500 #38

holy hell, that MAF is probably dead!

k4fari (Farrukh Ayub) 2023-07-22 17:57:38 +0500 #39

Really? I'll buy a kabli MAF and will share the STFT.

hasankhurshid29 (Hasan Khurshid) 2023-07-22 20:06:42 +0500 #40

You never wash MAF with carb cleaner or any other cleaner except electrical contact cleaner or MAF cleaner