DIY MAP sensor cleaning -- using XTool D7 to identify and correct Long Term Fuel Trim issue
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- เผยแพร่เมื่อ 15 ต.ค. 2024
- Update: There's a follow up video where cleaning the fuel injectors improves this condition further:
• DIY Fuel Injector clea...
Diagnostic Trouble Codes (DTC) often don't trip until issues have reached a critical stage.
Reviewing the Live Data from your scan tool -- in my case, XTool D7 -- will allow you to spot issues early in their development. Here, I am catching that my 2015 Ford Expedition 3.5L Ecoboost is running rich. Realizing this lets me evaluate all the potential causes of air/fuel mixture issues and work through a sequence to get my Long Term Fuel Trim back inside an acceptable range.
I didn't get all the way to where I want to be in this video, but I will follow up in a week or two as efforts continue.
Thanks Kent for the great video. I just purchased the d7 on Black Friday for $328. There are many options that can get confusing. I’ve been waiting for a good bi directional tool at a good price. Looking forward to more videos. Thanks.
I'm far from expert. Just a DIYer in my driveway at home, figuring things out as I go. But my D7 has easily paid for itself in the first year of ownership.
Thanks for the video. I just ordered an XTools D9 that will get here on Tuesday. I've worked on a lot of cars in the past 50+ years and have changed faulty sensors but this will be my first experience with anything other than a simple code reader.
I'm looking forward to connecting to my own car to learn. After seeing how dirty that MAP sensor was I think I'll go ahead and clean my MAP and MAF sensors. By the way, I read all the comments and I will say that both of my current vehicles have both and previously a Pontiac, Buick and Ford all had both.
What would be a good learning tool for these Xtool scanner? I purchased a D8 and its almost intimidating when considering I am a senior citizen with limited computers skill. I will keep looking for your video on these Xtool. Thanks
James, I can appreciate how challenging it would be to pick and use a D8 if you haven't been accustomed to tablets and computers.
I will throw together a quick "the basics" video to see if it's helpful for you.
@@KentForrest Thank you God Bless
Hi did your fuel trims settle after driving for a few days??I just cleaned mine and fuel trims are still negative but only driven it for 1 day.
Thanks... just got mine. Way over my head 😊
I learned sort of one feature/issue at a time. Didn't try to tackle it all at once, but instead "as needed" when I had a specific thing to work on. After a while it all starts to come together.
Good video I just got my D7 and I am learning how to use it, you definitely helped.
It's a great tool. So many capabilities that I'm still learning as well.
The MAP sensor should not look oily like that. Blow by issues I suspect. Check PVC system
Good job
Great video. 👍
just bought a d8 wanted the xv100 camera to find all the bolts i drop and the computer re learn feature so necessary if you want to stay out of the dealership and not spend $250 for a csk re learn. Good to see xtool did this for the d7. just about to drop my own video on the ac/dc chip replacement in my cpu on my other channel it worked out until I needed the re learn feature and I was like what is that.... Last March bought an Innova 3120 rs already had to upgrade.
thx fpr the video, just learning now basics about fuel trims, and i just got my brand new xtool anyscan a30m, not as fancy as your but gonna be very interesting to test this, i only paid like 195 usd :D
When it comes to reading live data, yours should be just helpful.
@@KentForrest Yes i belive so too^^ one question, let say you have a bad fuel pump and you do live data. let say you are maybe on +20% on fuel trim.. if i push the throttle/gas pedal then the Short fuel trim should go up even more maybe to 25-30 while my rpm goes up/higher right? then comes back to +20 when its idling right? is that correct understanding, and almost opposit if you have a airleak, it goes down, then up to 20 when idling?
Negative fuel trim (cutting fuel) indicates a rich condition. Positive fuel trim (adding fuel) indicates a lean condition. How STFT behaves is going to have a lot to do with how LTFT has previously adjusted and what the present running conditions are.
This video has one of the best basic tutorials on fuel trim.
th-cam.com/video/AQLO_ncPDIs/w-d-xo.html
I've just bought an a30m. It's in the mail. Are you happy with it? Do you have any issues or anything? Im hoping it's great.
what did it end up settling at after relearning?
This was quite some time back and I don't recall.
One can get a similar improvement in fuel trims by cleaning the mass airflow sensor. A useful tune up trick is to clean up the PCV valve if you have one.
Yes, some vehicles will have a MAF rather than a MAP. You're correct PCV (and several other sensors) also contribute to A/F mixture.
@@KentForrest I thought practically every vehicle has both a MAP and a MAF.
@@joemccarthy7120 some engines do use both. I'm willing to be corrected but I believe it's more common that an engine uses one method or the other. I think the use of both methods, in tandem, is found less often.
Great little vid with useful information! Do you have more videos demonstrating the use of the Xtool D7?
@@KentForrest thanks, I’ve been looking into the Xtool D7 and may buy one so any videos showing their use are good for me. Just saw you have a couple more so I’m watching those. Great videos with clear information, thanks!
Odd, I have seen that with 4.6 2 valve trickflow heads using trickflow cams, they do not work correctly, modular head shop is about the only company that grinds a proper trickflow cam for ford, modular, you can see this problem with fuel trims, and it’s a geometric issue,
One trickflow refuses to acknowledge…..anyway
still confused how just one bank went off? Hard to tell without seeing the actual air fuel tables, I use stc pro racer software that lets me build fuel tables. So I can see them,but it’s not cheep.
If this problem persists, I would think at looking for an obstruction In one side of the fuel line, or something that would only effect one bank, a map or maf , effects both sides ? Would it not? May be a bad ejector on one bank? Can you see ejector duty cycle or some such? I would look at that also. Not sure, odd issue.
Both banks are a bit rich. For sure one is richer than the other, but you'd like to see that long term fuel trim +/- 5%. Yeah, I got 125K miles, so a few things about age can make an engine run richer than new (valve seating, etc.). But I have a Ford Flex in the family with about the same miles and it's LTFT numbers are within that +/- 5%.
I do plan to look more closely at injectors, but in a quick glance earlier those seemed ok.
I have 6 vehicles, a boat, house and yard to care for. So I'll be honest I've just sort of piddled around with this issue for a few minutes here and there.
At some point, I will focus and get her figured out. We're nowhere near "check engine light" percentages (+/- 25%), so I don't feel a rush. Folks who don't own a scanner could have this issue, never know, and drive for years. Still, I do want to get it right eventually.