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Discussion Starter · #1 ·
I have a 4 cylinder 2005 Accord with a high STFT of 45%. The problem reports as a P0171. Despite the high STFT, the car starts and performs normally. The car has been of the road for 4 months now.
I hope someone can give me some guidance.
I have done the following without making the STFT go away:
1 I have replaced the fuel pump and fuel filter and had the injectors professionally cleaned. Fuel pressure is 50 psi.
2 I've replaced both O2 sensors.
3 I have swapped the MAF sensor with a known good one.
4 I found one vacuum leak in the Front Engine mount and replaced it.
5 I've blocked off/ plugged all the vacuum lines, ie the brake booster line, the purge line, the PCV hose line.
6 The MAP sensor reads 4.5 psi at idle and 3.6 psi at 3000 rpm. Is that correct?
7 I don't think there any intake manifold gasket leaks. I've used starting fluid in the area. There are no fuel injector seal vacuum leaks, which happened to me on another car.
Can someone give me guidance on what to check next?
Thank you in advance
Respectfully
AJW2W11E
 

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Discussion Starter · #3 ·
I measure 20 psi vacuum with a gauge and I've plugged all my vacuum lines (one at a time) and the STFT reading won't go away. There's about seven vacuum ports/ Tomorrow I'll post a diagram of where they are.
I will take another look.
 

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Discussion Starter · #11 ·
What are the values of the STFT and LTFT ?

What information is in the freeze frame data?

Check the tube from the airbox to the throttle body and make sure it does not have cracks in it.

Sent from my Pixel 5 using Tapatalk
STFT 42% LTFT 3%
Freeze Frame Data- Unfortunately I cleared the last PO171 back in the summer. .I haven't had another one since I don't drive it because I don't want to damage the car. It's is in a constant state of testing as I replace and test sensors etc.
I'm using Live Data
 
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