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thank for explain. i have dodge raam 21 6cyl when i drive on high way its gose very well but when i reach speed 140km its stop speeding and the rpm gose up the dtc i have close loop down stream...?

Great lesson

Nice tutorial!

Wonderful information. Thank you! Really good lesson!!

Does a wet compression test require a special tester?

Me being me, I have at least a hundred questions, but hands down, any tech that has a scope and wants to analyze ignition waveforms needs to watch this video.

What if I have wet cylinders-gas- from rich carb situation or weak spark or a combo. Should I remove carb and plugs and let air out/dry for s few days, maybe brake/carb in the hole to promote drying prior to compression test?

The Mazda I had in my 20s ran on this engine design. Kind of a neat engine.

Thank you very much. Which O2 sensor you were talking about? The upstream or the downstream? I suppose, the latter one?

Liked the string theory , brilliant presentation.

My vehicle when I bought it as I understand is tuned only to run open loop as I don't even have O2 sensors, It run's perfectly fine. But the fuel economy is horrendous on idle in summer (122 ambient air temp) Will adding the O2 sensors and retuning the vehicle to closed loop. Will that improve fuel economy?

Have 2019 ram 1500 5.7hemi why does 3 of my o2 sensors read mostly 750mv but I have 1 that reads 000.750 mv. Like decimal in wrong spot ask some people nobody knows, and they are brand new oem from mopar

Si

Excellent.

My Lexus 5.0 V8 (2UR-GSE) uses both Otto and Atkinson with both port and direct injection.

Jimmy neutron..?

What model picoscope do you have?

How does the sensor get cycled from low to high and high to low? Is it the ecu creating a condition of lean and rich?

best video ! thanks for the great instruction and help

atleast the test was positive

Very good!

That was very good and I thank you. Years back when GM began using HEI, I learned that disconnecting plug wires would usually blow a hole through the center of the rotor. The hole could be seen when holding the rotor up to a light source. Although the car would run, it did so quite poorly. 🖖🏻🍀

volume too high with the FX

the colliding fronts theory doesn’t make sense, Imo, I don’t know who came up with it. It’s true two fronts will cause a pressure spike but not because they collide. The secondary front basically accelerates combustion because fuel burns in two places at once. Pressure would go up like twice as fast but that itself wouldn’t be a problem. the problem is the piston may still moving up after the fuel has burned and will fight against the pressure. so it’s just equivalent to having a very advanced timing. There are cars with two spark plugs and the colliding wavefronts don’t cause any damage because of proper timing

Thanks for this description. I found it very good. I have just ordered a hybrid SUV with Atkinson cycle engine coupled with an E-CVT. . Does the VVT allow the engine to select between Otto and Atkinson cycle as required so you can maximise torque when needed. ? Thanks Rob, Melbourne Australia.

This presentation is very well done. Thank you Sir 👍🍻

Great video

This guy doesn't answer questions!

🔥 🔥 🔥

thanks for clearing up some confusion. It was bugging me but I did not know why.

thanks for filling in the blanks from all the auto videos I have watched

2005 Hyundai NF Sonata 2.0L Gasoline, 170Kmiles somehow shows very stable primary current waveforms but the peak current for all the 4 coils show steady 15A. Wonder if it is what it is or something else is going on. What would you say to 15A?

Great video. I just did a dry compression test on my 2001 Corvette Z06 and my number 7 cylinder gave me a number of 171. All other pistons are in the 195-200 range. I added 2 table spoons of oil to cylinder number 7 and that number jumped from 171 to 204. Is that without a doubt a ring problem?

What about cl fault?

Excellent explanation

You showed the trigger graph without numbers - what is the actual pulse voltage the trigger needs to send to the ignition module - does it need an AC component as shown on the graph.

How if the sensor reads between .7 to .8v. 4wire sensor. How to make the reading into .4v to .5v? And a p0420 code appears, after washing the cat it stays the read still at .7v to 8v at normal operating temperature.

Thank you. Theory, Example, Case Study, Trade Secrets and humor. All cool one. Cheers.

Lovely …. Elohim bless you

So an inline resistor in the right could hide the bad o2 reading from the com hmmmm

What would cause your car to stay in closed loop, even during first start up of the day, cold start? My car seems to be stuck in closed loop.

Where did you connect the hall sensor to the ignition module? To the P+ pin !!! <---------------- . You remove the distributor and apply the sensor. But what voltage is at the ends of P+? 12 VDC and the sensor (A3144) has a range from 4.5 to 24 vdc. 25 mA (0.025 A). Then several magnets to be arranged parallel to the sensor.

i'd just fixed the suzuki alto from this video didnt even replace any parts, issue crank but ont start! amazing video! thanks!

Are Bosch universal downstream sensors all the same for different cars? Do they have the same heating element (thus drawing same amount of ampere)? Do they have the same switching capability?

You are describing narrow band O2 sensor in the upstream operation that measures the oscillation created by the ECU (injector time). But most of the upstream sensors nowadays are air fuel ratio (meaning wide band) sensor that their ampere, not voltage, is monitored by the ECU. Am I right? Downstream oxygen sensors have been and still are narrow band (measuring 0-1V by ECU) and they are never air fuel ratio sensors, right? And, assuming Cat is healthy, we should see 700 to 800mV, not 450mV (at least when engine is in close loop and constant engine speed) because the NOx is converted to O2 by the cat, am I right?

This guy really knows how to teach. He has a very good delivery technique. He covers all the bases and he's easy to follow. Thank you, and keep up the good work.

The best way to remove the lambda sensor from the cast iron exhaust manifold is to heat the cast iron manifold near the sensor from several sides, if the sensor is broken, cut the wire and carefully unscrew the sensor with a long hex key, if you use a split key, which is more suitable for installing a new sensor, you can turn the edges of the sensor round.

im doing this on a atv. does it matter if there is oil and coolant in it? also the compression is 47-81 psi normally. could i still use the 100 psi ? i have tdc front and tdc rear , 1 cylinder each. do i test tdc front then rotate 360 and test again for the front and repeat on the rear?

You taught me more than what I learnt in 10 years by my self... excellent presentation 👌👌👌👍👍👍