hey guys hate that intro jugos been thinking of a good better intro than that seem to my friends when I talked to them on the phone I’ll be like what up maybe I’ll do that from now on with you guys since you’re my friends too like would up sorry anyway working on a 2001 Lexus something there’s no badges on the back of the car yes 300 is my guess I don’t know we’ll find out soon maybe when I put the scant old data in here maybe it’ll tell me symptoms on the car I was told by my friend Pete that it was brought in for a check engine light and lean exhaust trouble codes now there’s a catch to this the battery goes dead every couple of days and when I got here the battery was dead so we’re not going to have any code memory my hands are tied they’re a little bit I started it up letting the alternator charge the system and then hopefully we’ll set a full code look some fuel trims chasing a drain problem on the battery is difficult with a dead battery too so I don’t know we’ll see how this goes stand out of next okay so after I entered the VIN number the eighth VIN told me it was a GS 300 so we’ll read codes I doubt they’ll be any here be cool if there were yeah that’s what I thought dead battery no history codes of course no current codes I have no check engine light on right now all I have to go by is what Pete told me which is there was lean exhaust trouble codes data displays next I’m hoping my fuel trim numbers are out of whack at idle or at least they’re out of whack that I can recreate them sitting here hmmm I see negative fuel trim numbers he told me lien conditions now I’m gonna have to ask him again if it’s possible that they were rich conditions my trim I’m looking right here guys at the short term is negative ten and trimmed bank 1 sensor 1 percentage so the same number here looks like a redundant piece of data not sure why some manufacturers do that long term looks like it’s imbalance or terms negative 10 both banks are short-term too so look at that guy and we don’t want to do that too much glare my short-term to short-term one get those next to each other now negative 12 negative 10 let’s move the long term up there to focus up top here guys with me my short terms negative on both banks long terms are at zero I’m going to hold my RPM up see what it does by the way long terms would be at zero with the memory being wiped out from the dead battery so that doesn’t help either so our focus is definitely going to be on short-term here scan data baud rate here is super slow it is super slow okay I can’t I can’t rely on this I need to custom data display this there’s my oh twos and there’s me in the shot sorry I am doing field work and it is what it is okay looks like long-term is learning now here we’re minus 10 on bank 1 and minus 13 on bank 2 so short term is stabilized and let me raise the RPM let’s watch these numbers 2,500 rpm and I have positive numbers under higher rpms so that would match our our lien concern let me go a little bit higher I’m gonna try to get this a 3 grand 3000rpm so it’s getting worse as I’m raising the RPM about 14% on the long-term short-term still high – so these numbers are going to climb we’re going to bank one focus on Bank

one look at 5% short-term bouncing 14 1 14 8 I saw a second ago kind of looking at total trim here because this battery was dead now there’s a – so we’ll call it about 14 15 percent at 3,000 and negative 14 percent on Bank – right there for a second negative 9 negative 10 negative trim numbers at idle positive trim numbers at higher rpms guys this is a classic dirty mass airflow sensor symptom right here I haven’t test-driven the car or anything like that I definitely am going to start by pulling this mass airflow sensor and taking a look at it next step I’m going under the hood we’ll worry about the battery draw after we troubleshoot this air fuel ratio problem here alright so we’re staying low-tech here no reason to do any back probe testing scope testing on this math I’m just going to unbolt it take a look at it I have the key off right now unplugging it is not a problem again I’m going here up starting here because of what I saw with trim numbers I got to get a bigger Phillips by the way looked at the mileage there’s about 144,000 on the cluster yeah yeah that it’s super dirty that’s cool nice easy one here fellas I’ll post some other links for identifying dirty mass airflow sensors I’m thinking of one it’s a Subaru another one’s a Lexus like this another one is a toyota showing all kinds of different ways to identify 30 mass air flows sometimes it’s just fuel trim and then if it’s easy like this one look it’s right there why would we get crazy with it just unbolt it take a look at it let me get my flashlight see how dark black these resistors are try to get you and after saw do the same thing now how am I going to clean that I’m going to use this no not the pocket screwdriver yes the pocket screwdriver I like it because I can’t tell with a brush on this design how hard I’m pushing on the resistors and I found it the most effective way to lightly lightly scrape the crust off of these resistors and I’ve had lots of success with it it is dangerous if you’re not careful you easily Bend these so I’m not recommending that now yes I am just be careful when you’re doing it okay I’m going to put this flashlight my mouth and I can’t talk while I’m doing this can I show you at the same time probably not I can’t sweet one final piece I know you guys like this one that’s right break clean make sure it’s nice and dry

I’ll get you an after shot of these resistors and there there is your after shot you guys want to use the special mass airflow cleaner by all means do it I’ve been doing this long enough to be comfortable with break clean not all mass air flows are cleanable for you guys that are maybe watching me for the first time let’s put this back in and see what the scan data looks like biggest thing with these mass air flows is make sure that they’re not wet at all when you’re putting them back in and make sure of course that you always unplug the electrical connector when you’re cleaning them that’s just a safety net to ensure in case we forgot to turn the key off when we’re doing our stuff mass airflow sensors will heat the resistor hundreds of degrees above the outside air temperature and you spray that cold cleaner on there not a good thing for the sensor let’s go back inside now all right starting it up that’s cool it kind of held the data there so we’ll watch these long-term numbers let’s watch the short-term and long-term we’re in open loop right now flatline lean on the o2 s at the moment which is what I expected to see if we in fact fix this you’ll be able to tell once this goes into close loop the short terms will start to correct this Claire’s bad guys I’m sorry I like actually seeing this lino two at the moment I’m not going to give it any gas I’m going to let it warm up on its own for a second might be another good learning moment about open and closed loop recognition right now we are still in open loop sometimes you can force the system to start working it’s kind of looking for the o2s to switch it’s one of the enabling criteria for closed-loop fuel control on some systems so just a quick snap throttle can kind of get that going when you snap the throttle your there you go you’re driving the o2 rich and lean and there we go positive trim numbers countering are negative learned memory this is a fix some of you might be thinking why it didn’t set rich exhaust codes the p0 172 and p0 175 it wasn’t bad enough on the idle trim numbers the negative numbers weren’t bad enough to set that code so I’m sure that if we had the memory and we looked at our freeze frame data that this would have been an under load lean condition to 3000 rpm probably had positive 20-plus percent on our trims it even sounds better that’s cool pocket screwdriver and some brake clean I’m laughing because I’ve gotten so much crap about using those tools but hey man take a look did I fix it I did raising the RPM let’s look at our higher rpm numbers hold it at 2,500 for a little bit I like the negative trim numbers I’m seeing countering the long-term memory try to hold this at 25 first and yes even the short amount of time that I let you guys see this before was enough for it to start learning so we got to let this normalize

so much 7% and 4% at 2,500 still seeing some negative trims on the short-term so I think that seven is going to come down a little bit more and let’s go to 3,000 2% on bank-to-bank – looks great bank one is a little bit leaner but nothing crazy there’s 5% and negative 1.6 on the short term that’s going to come down even more these numbers look great come back to 25 we have some memories still in here at this one that 8.6% at this rpm and the negative for that’s going to come down to cooling fan just turned on so that’s going to potentially be a different cell as well different load positive eight negative three total trim will be five when this balance is out let’s go back to idle that is a fix guys now there’s a lot of other ways I could have identified this we could have gone for a test-drive did some o2 sensor wide open throttle tests we could have connected a scope to it checked peak signals all of that is valid all of that is stuff that I teach but here’s the one that is really really nice to use in this scenario just a wrap up with this is when you see negative fuel trim numbers at idle and positive fuel trim numbers at higher rpms that points at the mass airflow sets or start there for sure so nice easy one as far as the trim goes there’s some other stuff with this car I don’t know if it will be included in this video it may be a separate one or I may not do it at all is our charging system and our battery on this the complaint of this thing going dead if I was in the field and I’m doing this the battery drain and the battery draw is a completely separate problem I would absolutely be charging for that separately I say in the field I am in the field I’m doing a job for my friend Pete but I’ve only been in on this really twenty minutes and most of that was just making sure you guys were included in the shots and in the process I’ll look at the charging system for him with my regular flat feet but I’m telling you guys if you’re in the field knowledge is money knowledge is power and you shouldn’t be giving this stuff away separate problem you address the lean condition check engine light we know the light’s not coming back on and now we have a separate problem of a battery going dead it’s a separate issue then there’s this oil light that’s on to that I don’t like I’m not even looking at that to be honest with you um the engine sounds fine I’ll check the oil level and then outside of that I’m not doing an oil pressure test it’s not my concern I’ll make people wear that and I’ll let him handle that part but charging system again I don’t know if I’ll include that in here depends what I see if it just ends up being a bad battery that’s not holding it towards I’m not making a video with that I got to get going too I got a lot of stuff I got to do tonight so I hope you guys like that for the dirty mass airflow real nice easy one to identify and it was cool that you guys got to see the whole process sitting here right now my long term is negative 0.8 on bank 1 negative 2 percent on bank 2 short terms look great that is a fix nice easy one money in our pockets so thanks again for watching what I’m doing and and I appreciate all the support I’m again

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