Here is the video if the FT's on Dropbox
https://www.dropbox.com/s/t569w8t4qg6rqfu/VID-20230317-WA0002.mp4?dl=0
https://www.dropbox.com/s/t569w8t4qg6rqfu/VID-20230317-WA0002.mp4?dl=0
I did check it, it's up above.Any codes after? Your LTFT seems to spike a bit above +10 and seems to be mostly positive especially when accelerating.
You could check your fuel pressure before the fuel pressure regulator. If pressure is low, it would make sense that it's running lean and it's trying to add more fuel. It's a little pricey so would be worth testing before just throwing a new one on.
As for the fuel pump, I would hope that you got your ACDelco from a reputable retailer rather than eBay or Amazon as fake parts have been flooding those places. A CCC pump could have been slapped into an ACDelco box. They are actually made by Bosch and still have that sticker on them.
Now I'm confused. Are you or not getting a P0171 and high idle speed?Been driving with it for 2 years no codes.
I have to tell you I am a dyi mecanic enthusiast, owned a bodyshop back in the days. Nowadays I fix my own and my family's vehicles. What I really like doing is buying tools. That is a bad habbit. I do that for electronics repair, auto repair and boat repair. On occasion I might have everything to do home repairalso. Plus fishing gear all you can eat. It a problem at this point and the wife is in therapy hahaha.The "Known BAD" Wave Form Examples listed above are Generic ...but apply in almost all situations. The focus at GMT Nation is of course involving GM and GMC Vehicles and the Wave Forms may appear different for other Makes and Models. FYI... I own (...and use) ALL of the following Oscilloscopes and "O" Scope--DMM Combos:
(1) PICO-Scope Model #2204A (via Laptop) 2 Channel
(2) Hantek Model #1008C (via Laptop) 8 Channel
(3) Autel Maxi-Scope Model #MP-408 (via Laptop) 4 Channel
(4) Hantek DMM- "O"-Scope Hand-Held Portable Model #2D82AUT0 2 Channel
(5) Yeapook 7" Touch Tablet Oscilloscope 2 Channel
(6) Snap-On Portable Graphing DMM Model #MT-2400 2 Channel via KV Unit
If you want more On Topic Oscilloscope Diagnostic Information and Training Examples as well as Links to the FREE Software... Please Visit THIS Thread:
How To Use PICO #2204A & HANTEK #1008C Oscilloscopes
You don't need a Huge Bag of Coins in order to obtain and use an Oscilloscope for performing In-Depth Wave Form Analysis in Automotive Applications on everything from Problematic Electronic Fuel Injection to obtaining accurate Compression Tests to Diagnose Internal Engine Conditions. HANTEK...gmtnation.com
Check this thread. There was a glitch in the matrix.And what hapenned the website account was suspended 2 days ago than yesterday the whole website was off.
Check this thread. There was a glitch in the matrix.
ANNOUNCEMENT - GMTNation Planned Downtime
We will be changing our hosting provider immediately. Please expect the forums to close later today once the process has begun. We appologize for the short notice, this was a last-minute, unexpected decision. What will happen: Prepare the new server Close the forums Copy the site's data and...gmtnation.com
Thanks, the fill tube is new, the charcoal chanister is not.Here is another "Spot-On-Topic" Thread describing the P0171 WITH the 900 RPM issue... with more insights from "The Roadie" and Other Members:
Intermittant 900 rpm Idle, P0171 Code & Reduced Fuel Mileage
2004 Trailblazer LS 4x4; 82K miles; owned from 10K. After reading many posts both here and at TrailVoy regarding my above referenced "problems", I purchased an Actron CP9580A scantool. Only discovery found was low coolant temp, so replaced the thermostat, CTS, radiator hoses and anti-freeze...gmtnation.com
Here is another "Spot-On-Topic" Thread describing the P0171 WITH the 900 RPM issue... with more insights from "The Roadie" and Other Members:
Intermittant 900 rpm Idle, P0171 Code & Reduced Fuel Mileage
2004 Trailblazer LS 4x4; 82K miles; owned from 10K. After reading many posts both here and at TrailVoy regarding my above referenced "problems", I purchased an Actron CP9580A scantool. Only discovery found was low coolant temp, so replaced the thermostat, CTS, radiator hoses and anti-freeze...gmtnation.com
Thanks, the fill tube is new, the charcoal chanister is not. I changed the purge valveHere is another "Spot-On-Topic" Thread describing the P0171 WITH the 900 RPM issue... with more insights from "The Roadie" and Other Members:
Intermittant 900 rpm Idle, P0171 Code & Reduced Fuel Mileage
2004 Trailblazer LS 4x4; 82K miles; owned from 10K. After reading many posts both here and at TrailVoy regarding my above referenced "problems", I purchased an Actron CP9580A scantool. Only discovery found was low coolant temp, so replaced the thermostat, CTS, radiator hoses and anti-freeze...gmtnation.com
Can you elaborate? So take it out connect the vacuum pump and pump it with engine on or off, scanner on on values live data? How much air?test your MAP using a vacuum pump using your data reader to get the resulting info that the pcm sees.
Thanks, the fill tube is new, the charcoal chanister is not. I changed the purge valve
Recently due to the P0420 code. It tyrned out to be a leak in the fill tube to the tank. I bought a special adapter tgat took care of the code after many years of pain inthe rear like this one. Funny because the tank fill up gives me an oposite impression from that thread. My code came when tank was close to empty. I just filled it and nothing yet. Still waiting for the fuel filter. Don't think ot will do anything though.
engine off / key on. Use a hand vacuum pump. You change the vacuum by small amounts going from 0 inhg to say 20 which is basically a "normal range" for intake vacuum. The MAP should respond / agree with the vacuum pump's gage. IF it doesn't, then it is likely some issue with this area.... wiring, sensor, pcm, etc.Can you elaborate? So take it out connect the vacuum pump and pump it with engine on or off, scanner on on values live data? How much air?
Ok I shall try it thanksengine off / key on. Use a hand vacuum pump. You change the vacuum by small amounts going from 0 inhg to say 20 which is basically a "normal range" for intake vacuum. The MAP should respond / agree with the vacuum pump's gage. IF it doesn't, then it is likely some issue with this area.... wiring, sensor, pcm, etc.
Sorry I wrote the wrong code P0440.P0420 has nothing to do with the evap system. Basically means your cat isn't working (likely) or possibly an issue with your O2 sensors (less likely). To properly diagnose this, you would need to check and compare live data on both sensors. The upstream should be cycling while the downstream should be relatively flat indicating it's cleaning the exhaust. If it's cycling like the upstream, almost identical, the cat is dead.
Since the evap system was worked on, maybe the evap is leaking vacuum causing the P0171?
I think the fuel pressure is a red herring. It was worth chasing however, when mine was outright leaking with low pressure, it never threw a code so...
And since the head was rebuilt, it might be worth it to check the compression.