DIY MAP sensor cleaning -- using XTool D7 to identify and correct Long Term Fuel Trim issue

[@tomryan9616]

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.

[@KentForrest]

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.

[@watchdogu.s.a.8973]

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.

[@johncollins8304]

Thanks... just got mine. Way over my head 😊

[@KentForrest]

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.

[@mrbustos4277]

Good video I just got my D7 and I am learning how to use it, you definitely helped.

[@KentForrest]

It's a great tool. So many capabilities that I'm still learning as well.

[@babybullsmith001]

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

[@KentForrest]

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.

[@babybullsmith001]

@@KentForrest Thank you God Bless

[@nonamemeable]

The MAP sensor should not look oily like that. Blow by issues I suspect. Check PVC system

[@tripledtv5464]

Good job

[@phillipjlynch9340]

Great video. 👍

[@JoseSandoval-ic5xe]

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.

[@jbar100]

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.

[@janik7883]

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

[@KentForrest]

When it comes to reading live data, yours should be just helpful.

[@janik7883]

@@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?

[@KentForrest]

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. kzbin.info/www/bejne/d4KvgJKkmLV3f9U

[@reiannaidoo]

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.

[@jameybarisoff]

what did it end up settling at after relearning?

[@KentForrest]

This was quite some time back and I don't recall.

[@joemccarthy7120]

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.

[@KentForrest]

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.

[@joemccarthy7120]

@@KentForrest I thought practically every vehicle has both a MAP and a MAF.

[@KentForrest]

@@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.

[@ianhoulden2930]

Great little vid with useful information! Do you have more videos demonstrating the use of the Xtool D7?

[@ianhoulden2930]

@@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!

[@chippsterstephens6800]

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.

[@KentForrest]

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.