Variable CAM Timing
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- čas přidán 20. 07. 2010
- Variable CAM Timing
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Variable CAM timing is a concept that entails changing the camshaft timing, as needed, depending on engine LOAD demands. This technology was impossible just a few years ago, due to the state of the art electronics needed. The latest Variable CAM Timing (VCT) systems are infinitely variable, meaning they have no specified settings. CAM timing can be changed or varied instantaneously across the whole range (ie. Plus or Minus 30 degrees from normal). By varying the CAM timing, the ECM can regulate the power curve to meet its own needs. On any gasoline engine, each RPM setting has an optimum CAM timing setting, depending on load. Up until a few years ago engines were set whatever the CAM lobes were machined at. With modern VCT, this relationship can be varied, also varying the engine's power curve. Most modern VCT systems do not control valve lift, but do great by simply changing open and close timing points during engine operation. See how it works here, with this superbly animated training video on automotive technology and variable cam timing (VCT).
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I replaced my intake and exhaust solenoids on my 2009 Cobalt SS. Driving around town it drove well enough only had a slight rough idle. When power was demanded it would shake the car like the gas pedal was being stepped on and off. After the install I cleared the codes and went for a drive with instant results. Very good video I learned some more :).
@HamadHHAG No, 4 cylinders also use this technology. Pretty much all vehicles now use some form of variable valve timing. The latest in valve control is BMWs variable valve lift. See our video on this subject. Thanks so much for posting.
The best explanation of VVT I’ve seen, thanks!!
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@TrollingSince1991 The NSX was cutting edge indeed. To my knowledge Acura is considering bringing it back to production. We'd love to see that. Thanks for posting.
Thanks for sharing.
you guys are good...well done
Very very nice informative video sir
Correct, There is only one V-tec, it's Honda's. Nissan is N-VCT, Toyota is VVti and so on. It's just like when Cadillac came out with the 4.6L Northstar v8, then Ford came out with their 32V 4.6 and then dubbed it "Intech" in 1996, but people still called it a "Northstar" because it was a 32v 4.6L V8.
i have a 2002 grand voyager 2.5 deisel, the just dies afterabout 10 mins driving then starts again after about 15 mins could the crankshaft position sensor be the problem?
On a 05 Ford F-150 5.4 do I have to do anything special after replacing the vct? I did it on my friends and now it stalls or idles really low,put the old ones back and same thing,before I put the new ones it was doing it but only a little bit,now it's worse,clean the codes and still bad.
Going through this headache with a 2010 Jetta 2.5 engine. Snap on scanner showed VVT solenoid. I replaced and tested the old solenoid as well. It was not plugged up or anything from dirty oil. New one did not fix the issue. It also gives codes for the cam sensor, crank sensor, map sensor, and misfiring cylinders. Its at 88,000 miles so I gave it the full tune up and changed all the sensors, and R8 coil packs and new plugs. The camshaft sensor was quite dirty and did make an improvement in the car. But the problem is still there. It still throws all the codes and misfires. I am believing at this point it is time to pull the timing chain cover. I believe it to be the cam phaser itself and not a loose timing chain as everything is very quiet. The early 2.5 had a recall for timing chain issues but was supposedly resolved for 2010. I'm hoping its not the timing chain as its a very expensive repair. I could do it but it involves taking off the head as well as the transmission and possibly pulling the engine..Take me at least a week and probably special VW tools needed..Quoted $1900 for the job from VW. If I clear all codes it idles rough, up and down. I believe it is caused by the VVT solenoid giving it full advance and higher oil pressure onto the cam phaser making it do this as it smooths out as soon as I drive it and goes back to a normal idle..As I said the chain is quiet so hopeful its just a faulty cam phaser.
Ok
thank you
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ford ranger diesel 2013 model , i cant find the camshaft positioning sensor you tube has no video can i have a help?
The worst thing they could have done to the cam timing. Trying to squeeze a fraction of a MPG and creating a nightmare of reliability problems.
Sure
So kind of like an lnjector which is ground controlled by the PCM? Thanks
how to check the timing of 1st cylinder with respect to Cam and crk postn sensor?
I changed the sensor engine light went out but came back on after a few days running car
Great video, this is a 12V supply two wire solenoid? With a signal wire that returns near 0v with a good solenoid? Thanks!
No, you're over thinking this issue. It's a duty-cycle controlled (PWM) with 12 volt steady and PWM ground on the other. Some manufacturers may use a different arrangement, but this is the most prevalent. Makes sense?
ADPTraining
Emissions is not the only reason. You could just do enough with EGR valve. The idea is to fully control the power output of an engine. Bosch calls this torque management system and for this to happen the ECM needs to control all systems, including valves and throttle. Thanks for posting...
ADPTraining
ADPTraining
I really HATE THESE.. especially when I get stuck fixing one that has most likely taken out the phasers and valve train.. crap. get RID OF THIS...
What color wire comes out of wire loom and goes to which prong on plugin on 2005chrysler sebring crankshaft sensor pigtail
I have to replace plugin on crankshaft sensor what are wire color coming out of wire loom to plugin 2005 chrysler sebring crankshaft sensor
So the manual tells you to “unlock” the vvt on the cams prior to putting them back on after a rebuild. So tell me what happens if you didn’t follow the complex process of using two air chucks and tape to unlock or ensure they are unlocked? Wont they unlock or reset when the vehicle is started the first time?
Car started just fine and seems to idle good. But on the third drive i got some random misfires and p0017 codes pop up. Thinking i need to clean the oil control valves. These codes didnt come up until several like ten miles and after a long slow idle so the engine was good and warm.
Any ideas?
Change oil
@myfagan Hi, well yes, Alfa and even Fiat have always been on the cutting edge of technology. They're little known here in the states, advanced nevertheless. Back in the 1970s I had a small Fiat spider and no one knew how to fix it. It was double overhead cam, with an electric ignition. DOHC was cutting edge back then. THanks for posting...
Reason why Ford went to this on the 3 valve tritons is because of emission standards.The 1997 to 2003 triton engines never met emission standards.Still does not meet emission standards
Kia P0011.Bank A i need you opinión.
I just want you to ask if you know how to acquire a data base. or maybe a personal list or how to make with Oscilloscope a Synchronized CKP+CMP signal.
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I have a Mazda CX-7 with a 4 cylinder turbo engine. It had timing issues and I had all the related parts replaced. Finally we sent it to Mazda with a #1 cylinder miss. Mazda says the timing changes while the engine is running due to something they called diamond shims or spacers. Has anyone heard of this part?
I think that's next to the kanueter valve, but you will need a metal stretcher to get to it.
Ha Ha Ha
Sorry
didn't mean to make joke of your situation , but laughter can help sometimes.
Do you have any idea who else other than lexus uses fully electric cam phasing? Thanks
They also license this technology to other makers.
www.autodiagnosticsandpublishing.com/automotive_secondary_ignition_probe.html
cam shaft selonoid for 2007 Nissan maxima
I'm dealing with the P0024 code. I've cleaned the vvt screen, replaced the solenoid, changed the oil and it doesn't clear the code. I think it may be the chain tensioner, vvt phaser, or chain guide.
Use this tool to diagnose
www.autodiagnosticsandpublishing.com/pulse_width_pwm_controller_driver.html
I have a toyota camry 2009 problem, I changed the crankshaft sensor twice and it always dials code P0016 the car works well, only it trembles
Ok
@brownbassplayer Honda introduced this system in 1991... those are real engines
@myfagan I'm just talking about cars in America, the Honda NSX was the first cars to use vtec
Does 2005 2.5 Nissan Altima automatically adjust from TDC to
15° BTD ?
Haynes book doesn't say anything about the BTC but sticker on car hood says 15° BTC .
No degree's markings that I can see so the cam sprocket must adjust for that.
It will be a sad day in this hell if I have to take whole engine apart again to get to timing chain again.
It's so AWESOME to have to remove
3- motor mounts, crossmember,
heat shield, exhaust, flywheel inspection cover,
2- oil pans, along with all usual parts
JUST TO REMOVE TIMING COVER !!
- GOOD LOOKING OUT - TEAM screw the customer NISSAN .
Customers are supposed to Cuss about things .
It's part of our title
CUS-TOMERS
Hi. So all this is really nice, but what makes the Honda VTCs rattle on cold starts? The lock pin doesn't lock because of a weaken, or poor quality lock spring, or its are bad solenoid design? Thanks
No bad designs. Just how you take care of your car.
Hi if i take my vvt solonoids off when i do a valve cover re-seal will i need to take them off in certain sequences ? Vice versa?
Thanks
Make sure it's not spring loaded.
I'm not wrong, Nissans variable timing was not call Vtec... I know is pretty much the same thing but I'm talking about Vtec itself
how far can u drive your car until you fix it cause my car take of slow
If a VVT problem is causing misfires you probably shouldn't drive it at all. Driving any car with misfires can damage the catalytic converter. As such you could turn a relatively inexpensive repair of the VVT system into needing a new and very expensive catalytic converter.
Hi can bad variable valve phaser can cause p0341code and hard warm start of the car?
Georgi Karaivanov We dont know.You dont even mention the car.lol.Take it to a autozon3.Scan it.
Join a foru. .Buy the OEM shop manual as well.
Yes
will a broken oil control valve cause the car not to start?
Can i turn on the vtc manual??
No
hi what happen when the crankshaft sensor doesn't work?
+manic lokofe Then you get a no start condition.
+manic lokofe although the car doesn't have the variable CAM system, always have the crankshaft sensor.
car wont sart
This is why we could get 30 mpg with 400hp!
Wait, so first you start talking about crankshafts and then camshafts...
Which one is it? You show a 3D diagram of a crank. Do YOU know what you’re talking about?
No
can advanced cam timing cause a p0171 code?
No, this code P0171 is very common and points to an Air/Fuel imbalance, like a vacuum leak etc. See which side it's doing it, if it's a V type engine and then use the Fuel Trims to help you. Here's one of my publications on the subject.
sites.fastspring.com/autodiagnosticsandpublishing/instant/obd2_diagnostics_repair_strategies
ADPTraining Vehicle is a 2001 Corolla 1.8L with plastic intake. It's only lean at idle. I removed all hoses that connects to the intake manifold and plugged them. Still lean. It already has a new MAF and Fuel pump. What else could it be?
Plastic intakes are notorious for O-Ring leaking. So, you may have to remove it and replace the O-Rings. Before you do that though, use propane to find the leak and make sure before you do all that work. Ans always use the FuelTrims PID on your scan tool to detect the issue. You may also have to reset adaptive memory after or in between tests. Good luck. PS. Here's a publication that will help.
sites.fastspring.com/autodiagnosticsandpublishing/instant/automotive_equipment_repair_strategy
ADPTraining The problem is I already replaced the intake manifold gaskets. Still lean at idle only. Also, disconnected the battery for few minutes and still the same. Any suggestions? It's a tricky one.
Yes, I've seen this many, many times. You need to use propane and a long hose or hollow tube to run the propane at various suspect sources. On FORD V6 for example, the intake variable air induction valve shaft (1/8 inch shaft) leaks and you need to replace the entire manifold. As I said, use the FUEL TRIMS and propane. That's the fastest way to do it. Good luck.
Vtec gives performance and vvt gives efficiency. Is that right guys?
y88
Traduction frensh or arabic
Ok
thanks for the boner guys.
Шшлз
А
Ok
Lmao DUTY cycle bwahahahahaha
English please
Thank you!
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Do away with the generic, synthesized voice... there should be plenty of people available to read a script =/
Painful.
Thank you. For more training, videos, software and equipment visit my site.
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auto makers are full of crap why did they have to make this contol valve,all they did was bring more mechanical problems,it doesnt make they car run better
Robot voice gets a thumb down and a block.
Oh man gummy a break. I try for you guys.
What is expected is to show me the oil flow and how it changes the timing. But just all bull shit
Every vedeo stupid computer voice I don't know why
Lol
Such hi-tech electronic BULLSHIT, Engines ran a 100 yrs without this shit
allen blackman
And it was extremely inefficient in the past 100 years!
Now, common fuel efficiency can approach 50% with experimental much higher!
allen blackman blame the epa
allen blackman Yea getting 7 miles per gallon with 150 hp.