For anyone who cares, the 2007+ 2.2 Ecotec is a Gen 2 block. There are many significant changes on the Gen 2 block. The 2007+ Ecotec received numerous updates including individual coil on plug, and a completely revised head. Unfortunately, it is common on the 2007+ 2.2 ecotecs to have valve and/or valve seat issues. The 2009+ 2.2 Ecotec was revised even more since 2009 was the first year for VVT on the 2.2. For the most part 2006 and older 2.2 L61 ecotecs don’t suffer from valve issues, but timing chain issues are another story.

I love how your are helping others plus your are documenting your work for the customers.. Win Win

Thanks for the visual on the valves. It helps to visualize what's going on in there.

Thanks Ivan for taking the time to record and share. I find your analytics/explanations very insightful and educational (like being at school - but more enjoyable!). Keep the vids coming!!

Nice demonstration of looking at behind the scenes with an ignition voltage check and with a pressure transducer. Nice scientific look and nice follow-up to see the actual leaking valves.

Good work... haven't pulled a head myself in a while, starting to miss doing the bigger repairs! :)

still trying to understand how you hook up wires ampclamp etc to see ignition or compression related diagnosis in Volts waveform. Well.. learning a lot with your diagnosis and repairs. biiiiiig thanks Ivan

Very good analysis. As an alternative, 1st perform a compression test, that will get you to the suspected cylinder. Then connect your compression hose to that cylinder, roll the crank to close that cylinder's valves and apply compressed air to that cylinder. Look under the radiator cap for air bubbles (head gasket problems). Listen to the throttle body (intake valve leak) and the tail pipe (exhaust valve leak) for the hissing of air. This is not as technical as your method, and leaves a few things to question. It takes 10 minutes and may yield some interesting results....... Keep up the good work. Dave.

The relative compression test was the quickest and most resourceful of them all. Great pioneering scope work in trying to find a corelation between the good and the bad. Bad leakage on two valves. Why that cylinder and not the other three ? The machine shop was the only route.Heavy duty operation for both assembly and disassembly .

@caraudiosales3572

5 жыл бұрын

leaking valve stem seal?

what is the book you are referring to for secondary waveforms called, it looked like it had some good info in it.

Where can I get that book and have u a video where u make the pressure transducer

I had a p0301 and changed the coil pack, it ran rough also. After changing in coil pack it ran perfect for 2 days. Now it runs rough and i have a p0302. Changed the ignition coil pack again and now it runs perfect again. Any ideas?

how much did you charge for all this?

Great video . hay just remember when you use the in cylinder pressure transducer you already and one cylinder with low compression and it was missing so when you tested the good one you had two cylinders down like you said but when you tested the bad on you only had one cylinder down this will make the readings on the pressure transducer look like there was not much difference because of the engine speed you see you had two cylinders down and the speed of the engine was lower you needed to kill two cylinders and keep the engine the same or this test is sometimes hard to call Thanks and all the best

@romanduncan6230

3 жыл бұрын

i realize I am quite off topic but do anybody know a good website to stream newly released tv shows online ?

@connorrohan8786

3 жыл бұрын

@Roman Duncan I watch on flixzone. You can find it by googling =)

@mosesdominic9827

3 жыл бұрын

@Connor Rohan definitely, I've been using Flixzone for since april myself =)

@rhysethan2264

3 жыл бұрын

@Connor Rohan yea, I've been watching on FlixZone for since april myself :D

@lucassage8820

3 жыл бұрын

@Connor Rohan Thanks, I went there and it seems like they got a lot of movies there :) I really appreciate it!

could you tell me what book you were using as a reference ?

Ivan, I like your aproach. Would you try a first look sensor connected to intake manifold vacuum or the MAP signal ac-coupled to show this ex-valve problem ? You know there is more than 1 way to skin a cat...., even a vacuum gauge. Thank you

Great video it definitely helped me a lot. Never messed with a dohc car until now. I had my cam gear jump a tooth as well while removing it. What do I do about making sure it goes back together right? Just make sure the 10 o'clock and 2 o'clock marks are back in the same spot? Thanks

I don't want to sound like a know it all, but you should do a snap throttle when checking secondary ignition waveforms, you really cant tell to much when you don't load the coil. I bought all the parts to make the same pressure transducer but without a picco scope I don't see any value in doing any in cylinder pressure testing Great Job and cool video

@PineHollowAutoDiagnostics

8 жыл бұрын

+JOHN HUFNAGEL Good point! However in this case the waveforms wouldn't change much during the misfire since the spark still occurs, but outside the cylinder. What I really should have done is a test drive before even pulling out the scope :)

@Mebob2001

8 жыл бұрын

+motoYam82 ive got a verdict D7, yet to really play with it, but this exhaust valve issue has bin something i've seen twice on the cobalts/pursuits/G5 haha i work in a gm dealer and ye, wait till you hear a newer car's crank case vent system when it acts up, will set lean codes, miosfires and all kinda good fun, lets forget to mention the front crankseals that squeak xD

@JOHNPHUFNAGEL

8 жыл бұрын

I do think you will see it, the spark line will bend downward with a low compression misfire, according to this article. www.diagnosticnews.com/anatomy-of-a-waveform/

How much air pressure in the cylinder.. what percentage was it leaking. My piston pushed down on 80psi and had a 30% leakage on piston one couldnt hear anything leaking. My compression numbers were [1] 195 (2) 205 (3) 215 (4) 215. It was on a 2.2 ecotec engine

where can I get the book you using???

Hi,thanks for the video, did you learn a lot on your ignition waveform conference? Would you consider doing an in depth video on ignition wave forms analysis ,putting in everything you learnt, please !

Have you done running compression with a flat cam just curious what that looks like with a pressure transducer

At 4:24 we have a difference of ~0,5 kV at the voltage line before the dwell time compared to after the burnline. Then the slow increase till to the next dwell. How can this be explaind? Its not like that on Zylinder 3

What book is this??? I've been looming for a book on waveform analysis

Another great video Ivan, I always learn a lot watching you diagnose. One question, though, if your transducer is set to produce a half volt at atmospheric pressure - which is 14 or 15 psi - wouldn't one volt be equivalent to 28 psi, not 38 psi? I know it doesn't really matter as you are using the results relatively to diagnose, but I was just wondering if I missed something in how you determined psi to voltage. Keep up the great work - you and Eric O. have turned me into an armchair mechanic (it's a lot easier than the real thing!)

Nice video Ivan. Where were you able to find that transducer? I've been looking all over for one that will read vacuum up to higher pressures. All the higher pressure ones I have come across start at 0 PSI. Thanks

I wonder if first look sensor would find this valve problem by connecting it to intake manifold. Great job as always.

@PineHollowAutoDiagnostics

7 жыл бұрын

I don't think so. Maybe if the intake valve was leaking severely, which is not the case here.

@kyhomegarage3430

7 жыл бұрын

motoYam82 thank you for quick response to my question if you could please watch my last video with Chrysler Sebring on my channel I had bad coil and PCM was limiting current but I don't know if I had shorted primary or secondary. Thank you.

Yep time for the machine shop

Hey Ivan. You're a awesome tech. I enjoy all your videos. Can you leave the link where you brought the your book in this video. Looks like a great book on ignition waveforms. Thanks

If all other valves were good. I I think I would of tried course valve grinding compound then fine. And tried an in house fix. Lapp them in.

@PineHollowAutoDiagnostics

8 жыл бұрын

+Jason Curry Yeah typically if it's just carbon deposits I've gotten away with cleaning and lapping compound. That would probably work OK here too, but I decided to take it to the machine shop since it's a customer's vehicle and they want a long-term fix...might get it back today!

Hey Ivan..Must have missed it somewhere but what psi transducer have you found that seems to work better for this.? Keep up the good vids..I'm still watching them all. Cheers

One of your wave form looks like is tilting toward indicating something is wrong with one of your valve.

Is the machine shop going to clean all the valves and seats or are they just going to do cylinder No.3? For all the work it takes to remove the cylinder head, I would have them do all the valves in all the cylinders.

@leebarnes655

8 жыл бұрын

Yes, they will. It's standard procedure to do all of them and put on or supply new guides, and stem seals where applicable too. Also quite common to have the head milled flat if no cracks are found in the process of grinding the seats. Milling is optional and ensures a good job in allowing the head gasket to seal and last as long as possible.

crazy, Wonder if this is a manufacturing issue Iv had two different 2.2 eco's with issues on cylinder three, one with bent exhaust valve and the one Im working on now, which I pray is not a valve issue as I just put the damn motor in the car!

Nice diagnosis there Professor Ivan! Do you happen to know if the 2.2L Cobalt engine has a common issue with the fuel injectors? I got one in today with 70k miles, P0300, scan data shows cylinder 3 is misfiring. Coils and plugs tested good. Had to quit for the day before checking injectors or compression. Thanks man hope all is well.

@buffalophil3630

2 жыл бұрын

Did you figure it out??

At 5:22, is that Danner's book?

Might want to check the injectors for flow too.

Doesn't look like carbon buildup was the the cause. On the hummer series the seat was actually distorted , was the seat on this one the same ?

@PineHollowAutoDiagnostics

8 жыл бұрын

+Steve Rob The sealing surface did not look even all the way around the seat, so it did look like valve seat distortion. I found a great article here with some relevant info: www.aa1car.com/library/ar993.htm

@serchmarc

8 жыл бұрын

+motoYam82 well you actually , you could use some cleaner and then use some blue print or pruscia ,, sorry i dont know how you call it there in your country.. A simple paint to see if its the seat distord or an uneven valve surface for the ex gasses but i think you said" what the hell the machining guy will tell me " ;) hehe

@sixpacksandsrts9122

8 жыл бұрын

+motoYam82 They won't just replace them. They can be ground out I worked in a machine shop for a while. Valve job per say

@PineHollowAutoDiagnostics

8 жыл бұрын

+Jason Curry Yup the machine shop guy didn't get too excited when I showed him the head. All he said was "valve job" lol gotta trust the pros :)

GM has apparently gone down the toilet, that's just bad engineering, and its a 09 . Best to get a valve job, if this happened to one, I'm thinking another one just down the trail, How many miles on that sled ?. But I guess they build to price anymore so not surprising really. I used to balance and B print Chevy engines 327/350/396s straight from Chevy, they were terrible straight from the factory. But that was 1971, They haven't learned a thing , or we haven't learned what to steer clear of. Amazing 2009.

@PineHollowAutoDiagnostics

8 жыл бұрын

+Charles Miller Yeah 6-year old car with 90k miles...embarrassing really. Something as basic as valve seats should be a non-issue in this day and age!

@laxbeach2381

7 жыл бұрын

Charles Miller I don't know my 05 didn't give much issues, same engine also with 80,000 miles driven on the engine . They were decent cars, I traded mine in a year ago for a 15 Camaro, and the difference is great. Now seeing that this car has 90,000, it could potentially happen, but it's no longer my concern.

@MinecraftSurge

5 жыл бұрын

oh boy i have a cobalt 09 with a p300

As u can c, no loc tite on those cam bolts. Bolts that r tight don't need loc tite. Factories do it for three reasons. 1. Make life miserable and discourage people working on their own cars. 2. Lawyers. 3. Buddy buddy relationships between DuPont sales reps and factory procurement people. Always enjoy Ivan's approach. Techs that loc tite every bolt, r u kidding?

Can you fix my cobalt

Is that Paul's book in that video?

@PineHollowAutoDiagnostics

8 жыл бұрын

+Gregory May It's a lecture from John Gillespie of the CarQuest Institute :)

@grzegorz16100

8 жыл бұрын

motoYam82 Is it available to buy? Thanks

@PineHollowAutoDiagnostics

8 жыл бұрын

Not sure...look up CarQuest Institute for more info.

I have to wonder now if this is an interference engine and if the operator wound it up too tight on a missed shift and kissed his #3 piston? Any marks on it? For sale CHEAP good used engine.

@PineHollowAutoDiagnostics

8 жыл бұрын

+Lee Barnes I talked to the owner; she drives responsibly and keeps up on the maintenance :) And it's auto tranny...pretty much fool proof in terms of over-revving...but the variable is always there.

@leebarnes655

8 жыл бұрын

I saw her watching over you in a couple of shots and had to wonder if this was the worried owner evaluating your work and methods. It just seems too much of a coincidence that both leaking valves were side by side, but with your added information it sure would be hard to over rev it which isn't a sure fire way to knock out both and only both #3 exhaust valves to begin with. Can't see it happening too easily now, so much for that cheap seat theory. Thanks for extra info. There is a guy on youtube that straightens these kinds of bent valves with a large screwdriver and just tweaking them back to straight. Don't have access to valve grinding equipment any more but I sure would like to have given this method a litmus test when that was possible for me. The concept is so ridiculous that I never entertained it before, now I have to wonder.

no way @10:25 should your transducer read 88 psig on the compression towers...not with -8 psig vacuum on the intake stroke. (9.2:1 compression ratio) -8 psig = 6.5 psia 6.5*9.2 = 59.8 psia = 45.3 psig Yvan, I made a similar DIY transducer to yours and these are the kind of results I get and to my understanding, more consistent with Boyle's Law. Typically 1/3 of crank compression test results...not 1/2

2010 Cobalt Had CEL and TC lights. Had the P0300 which lead to low compression cyl 1. Had head rebuilt at 47k. Sad really.

@PineHollowAutoDiagnostics

7 жыл бұрын

yeah that is very low mileage to need a head job...

@paulsosa1872

7 жыл бұрын

I'm fearing this going on with my 2010 cobalt I got a misfire on cyl4 and is causing the TC to go off. I really hope I don't have to pull the head :(

Your verus seems to operate well. Why does Eric O have so much trouble?

@SteveRobReviews

8 жыл бұрын

+Steve Allen I think its allergic to brake clean:)

@EXOVCDS

8 жыл бұрын

+Steve Rob ROFLMAO!

The cabalt model made in Thailand I guess.....Q.C, GM can't keep up. Really sad thing.

Good for going to 😴 sleep