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Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 11:09am On Aug 19, 2015 |
some person here might probably be wondering what a vacuum leak is..... The MAF sensor i.e mass air flow sensor measures(meters) the amount of air entering into the engine. IAT sensor, air inlet temperature sensor measures the temperature of this inlet air to the engine. Driver can manually varies the amount of air entering the engine via a throttle pedal. how does the ECM, engine computer module knows this it uses TPS, throttle position sensor. the ECM then increases the pulse rate of the fuel injector.....bla bla bla..... to achieve stoichiometric air fuel ratio...lol The computer(ECM) uses Pre CAT O2 sensor B1S1 for a single bank engine e.g I4 engine or B1S1/B2S1 for dual bank engine e.g V6 engine to measure the A/F ratio of the exhuast gas. this feedback is necessary to control........too much story Back to vacuum leak..... any air into the engine post MAF sensor is not metered or measured. The ECM does not know this. what it sees is the O2 voltage reading. B1S1 voltage reading will shows a lean condition i.e too much air in the exhaust. The ECM based on this signal, increases injectors' pulse rate for the next power cycle meaning u will be burning more fuel than is required. how do you know this ....fuel trims 1 Like |
Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 10:56am On Aug 19, 2015 |
@ makarios911, you need a scantool that has livedata facility. to check for vacuum leak, you need a smoke machine, or scantool + propane touch method What i would normally do, i set my scantool to displace long term fuel trim(LTFT) for both banks. With the car idling, i open the throttle to about 2500RPM or more. If it's a vacuum leak, i should see my LTFT drop from positive %value to close to 0%. The rationale behind this is that at high rpm, the effect of vacuum leak becomes less significant. Hence your car may probably have good gas milage on highway but very poor one in the city |
Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 9:23am On Aug 19, 2015 |
understanding fuel trims: https://www.youtube.com/watch?v=5WnM_NsOtd8 |
Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 7:02pm On Aug 18, 2015 |
from the data you provided, u can calculate your MPG. check against factory value 21/27 city/high way for a 2007 rav 4 FWD I4 2.4L engine. V6 engine will comsume more fuel. In simplicity conventional car consumes more fuel within city than high way, for the above example 21MPG in the city and 27MPG on highway. To get better gas milage, you need to scan ur car, check that your long term fuel trim is close to 0% as possible. The fuel trim shows the % deviation from OEM source code. For a car that has 20% long term fuel trim, it means the ECU will add 20% extra fuel for each power cycle. You need an advance mechanic to restore your long term fuel trim if it is out, not road side mechanic, never! Avoid excessive use of your AC change your engine oil with synthetic oil Accelerate gradually(car consumes more fuel at kick off and stop), avoid hard braking avoid unnecessary idling. change your inlet filter frequently...... change your PCV if clogged get correct tire pressure. under inflated tire results in excess fuel consumption. ......the list is endlss Experience4u: 1 Like |
Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 1:13pm On Aug 18, 2015 |
respect @ GAZZUZZ, hope i haven't broken any rule in ur thread. i'm here to help as well |
Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 1:11pm On Aug 18, 2015 |
for poor gas milage, you need a scantool that has live data functionality. 1. run a scan and scan if there's any present malfunction or historical trouble code 2. Check your live date. You want to be looking at your fuel trims. short and long fuel trim. you want to be close to _+0% on your long term fuel trim LTFT 3. for your case i believe you are probably running rich you should be between 20 - 24% negative long term fuel trim. This will lead to diagnose if u have a vacuum leak, poor fuel injectors, dirty MAF sensor etc 4. your short term fuel trim tells u the instantaneous pulse rate of the fuel injector/ fuel pump performance. can diagnose dirty fuel pump filter or clogged injector 5. exhaust leak may and may not be significant. Post B1S2 exhaust leak is less significant in fuel economy. Exhaust leak before before the B1S2 will cause excess air into the exhaust and ur O2 sensor voltage will be rather low close to 0.1V. the list keeps on going till infinity...... IAT sensor reading, RPM vs cycle load, spark plug misfire live data, alldata repair manual i'm an advance DIY, trained online by scannerdanner, subscriber to ericthecarguy, schrondinger, chrisfix, scotty kilmer on youtube. i stay around PH environ but i'm not always available because of work. I do diagnosis for almost free. ADVANCE diagnose if u know what i mean and can program auto key for almost a token with my powerful skp-900 key programmer. I use toyota intelligence, toyota techstream and autel maxicheck for my diagnose. I have maxidas708 but for paid diagnose only 4 Likes |
Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 12:53pm On Aug 18, 2015 |
I4 engines gereally have two oxygen sensor and cat converter is bween the two O2 sensor. |
Car Talk / Re: Maintenance Tips On Cars. by oseri(m): 12:33pm On Aug 18, 2015 |
Intelligent people here but sometime you might need more than just a guess. Cat available or not. Like seriously.! You don't need diagnostic tool to check that. Simoly follow the exhaust manifold from the engine. U shud see the first oxygen sensor A/F ratio sensor. Very important and more expensive than the other post cat converter. |
Autos / Re: Auto Spare Key Key And Remote by oseri(m): 3:41pm On Aug 12, 2015 |
fixmykey: toyota techstream has the facility to do it but seed calculator for toyota/lexus/scion is expensive(aliexpress). If u have SKS calculator, then i can pay that service alone. Unfortunately my SKP-900 don't have that facility |
Autos / Re: Auto Spare Key Key And Remote by oseri(m): 11:30pm On Aug 11, 2015 |
Toyota smart key. Two in number |
Autos / Re: Auto Spare Key Key And Remote by oseri(m): 9:03am On Aug 11, 2015 |
I have two keys that have been previously programmed. I need a flashing service to enable me reprogram them |
Autos / Re: Pre-order Cars/Suv With 50% Deposit, 7 Weeks Delivery by oseri(m): 10:21am On Aug 08, 2015 |
you have a mail from me. Kindly respond ASAP. My mobile network is down. |
Autos / Re: Sold! Sold!! Sold!!! 2008 Mercedes Benz GL450 With 32000miles @ N3.2M by oseri(m): 11:08pm On Aug 07, 2015 |
koolkesh: i didn't see it that it is a naija used. |
Autos / Re: Sold! Sold!! Sold!!! 2008 Mercedes Benz GL450 With 32000miles @ N3.2M by oseri(m): 9:15am On Aug 07, 2015 |
THIS IS THE BEST PRICE I'VE SEEN ON NAIRALAND. TOO GOOD TO BELIEVE. I WILL GIVE YOU A CALL |
Autos / Re: Registered Benz E350 4matic by oseri(m): 11:43pm On Aug 05, 2015 |
Scammer. This ridea was advertised by another auto dealer |
Autos / Re: Toyota Picnic 2000 For 700 Sharp Sale by oseri(m): 11:31pm On Aug 05, 2015 |
Location pls. |
Autos / Re: Sharp Toks 2006 Mercedes Benz CLS @2.4m by oseri(m): 9:05am On Aug 05, 2015 |
location? |
Autos / Re: Tokunbo 2005 Lexus RX330 For Sale. by oseri(m): 8:49am On Aug 05, 2015 |
location of the car? Can you provide VIN pls? |
Autos / Re: *** Clean Title 2000 Lexus RX 300 Pre-order By Jinadujosefu Of NL *** by oseri(m): 2:24am On Aug 01, 2015 |
Hope it's an AWD |
Autos / Re: *** Clean Title 2000 Lexus RX 300 Pre-order By Jinadujosefu Of NL *** by oseri(m): 2:07am On Aug 01, 2015 |
I will call you in the morning |
Autos / Re: 2006 Mercedes Benz Cls 55 AMG Kompressor by oseri(m): 9:24pm On Jul 28, 2015 |
how much for this beast? |
Autos / Re: A Sharp 07 4runner & An Ml320 In Port Harcourt Call Now by oseri(m): 9:12pm On Jul 28, 2015 |
glasshouse:na AWD? |
Autos / Re: A Sharp 07 4runner & An Ml320 In Port Harcourt Call Now by oseri(m): 1:22pm On Jul 28, 2015 |
Is the Benz 4matic? |
Autos / Re: Buy And Drive 2006 Mercedes Benz R350 @ 1.5m by oseri(m): 1:02am On Jul 28, 2015 |
Where is this car? I'm much interested |
Autos / Re: ***HOTT!!!Very Good Car Upholstery Work*** by oseri(m): 4:07am On Jul 26, 2015 |
very nice job. where is your location and how much will it cost to do for corolla, leather seat and dashboard? |
Autos / Re: *** Clean Title 2000 Lexus RX 300 Pre-order By Jinadujosefu Of NL *** by oseri(m): 11:05pm On Jul 25, 2015 |
osama10, this is where u shud bring ur purchase to. I'm still awaiting a good deal on my RX300. |
Autos / Re: Settled by oseri(m): 8:46pm On Jul 24, 2015 |
CALCULUSX is the name when it comes to pre-order. It's not an advert, check his profile and thread. Calculusx all the way.... 3 Likes |
Autos / Re: *** Clean Title 2000 Lexus RX 300 Pre-order By Jinadujosefu Of NL *** by oseri(m): 10:58pm On Jul 23, 2015 |
ok bro. AWD oooooo |
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