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Car Forum / Chevrolet / Chevrolet Trucks / September 200799 Burb Drive Train Shake Problem
I get a severe shake when going over 65 and I speed up to pass someone. When the tranny drops out of overdrive and then goes to slip back in after the pass has been completed, the whole drive train shakes like hell. If I let up on the gas and then gently step on the gas to maintain speed, it will go away. The service light will come on and it always reads the same code. Misfire 5th cylinder. I've changed the plugs, wires and distributor. I took it to the dealer and they said it needed a tune up. They replaced the parts I had just changed 3 months earlier. The problem is still there. Now they tell me it's a stuck valve. This has been going on for 2 years now. When I first felt it, it only happened when the truck was fully loaded and going up a hill or passing someone. Now it's doing it when the truck is empty and much more often. Could it be a stuck valve and if so, what's the best way to fix it? Thanks, Mike do not run it in overdrive unless you are in a nearly flat long stretch. the overdrive clutches are the weak spot in that 4l60e transmission. soon you will face a 2300 dollar rebuild. old john Hello, ! You wrote on Mon, 3 Sep 2007 00:02:24 -0400: MM> Thanks, With best regards, ajeeperman@comcast.net. E-mail: ajeeperman@comcast.net >do not run it in overdrive unless you are in a nearly flat long stretch. >the overdrive clutches are the weak spot in that 4l60e transmission. >soon you will face a 2300 dollar rebuild. >old john It is not so much the 4L60 being a weak design as it is as they ship them with too tall of gears in drive axles for false high EPA MPG ratings that do not pan out in real world and that strains OD badly at times. A 3.42 is pretty tall for a heavy burb with a SB and it has to strain a lot at times to maintain headway and hunts around. THis is also compounded by GM's knock sensor that retards spark to control knock before you hear it which reduces availble power in OD in warmer weather which can also make engine ruff at times under times a severe knock control. (the knock sensor masks true octane requirements at the expense of power and MPG) Make no mistake that without a knock sensor and ECM retarding spark that engine would rattle like it was full of marbles with 87 in it in summer. Retarding spark does stop knock but it really hurts power too. BTW, I have a old 89 burb that I bought new and I have run it for years on 93 and it runs sweet even after 180k plus miles. It has 3.73 gears and stock type tires and it pulls OD really well rarely downshift and will step right out in OD too when called on to do it. I averages 17 MPG or better on trips too using A/C. ----------------- TheSnoMan.com admin@snoman.com barfed out... > It is not so much the 4L60 being a weak design as it is as they ship > them with too tall of gears in drive axles for false high EPA MPG [quoted text clipped - 16 lines] > ----------------- > TheYellowSnoMan.com Why does he waste everyones time posting crap that is irrelevant to the issue at hand? Talk about an attention whore stroking their undeserved ego... ----------------------------------- Snojob Follies: SBJ: Dumb brake question http://tinyurl.com/2ya3wo SBJ: Front wheel bearings-2000 Blazer?? http://tinyurl.com/2j44zv ----------------------------------- > ad...@snoman.com barfed out... > [quoted text clipped - 33 lines] > > - Show quoted text - Some people just LOVE to hear themselves, this is the only thing I can thing of. >>ad...@snoman.com barfed out... >> [quoted text clipped - 36 lines] > Some people just LOVE to hear themselves, this is the only thing I can > thing of. It seems there are a lot of lurkers who appreciate such information. It's not "all about you". If your ego is injured killfile the poster. > It seems there are a lot of lurkers who appreciate > such information. It's not "all about you". > > If your ego is injured killfile the poster.- Hide quoted text - Never once said or implied it was "aal about me" a.shole. Why don't you learn what you speak of when defending snotroll before you speak. If his information is so invaluable to so many lurkers (like you) why don't you have him explain why he told a user in a different group to trade in her truck, when the only problem she had was a bad speed sensor. OR ask him where the knock sensor is on the Dodge V-10? News flash jack off, snotroll is wrong more than he is right and a lot of the info he post is utterly useless, down right stupid and in a LOT of case flat out dangerous. The Troll is you and your ilk, who as you put it, "love to hear themselves". Quite frankly, you are nauseating and crude. Please don't bother to respond (I won't be reading it), unless of course you want to impress the other mental midgets of your class, or even yourself, because I know " you love to look in that mirror." >> It seems there are a lot of lurkers who appreciate >> such information. It's not "all about you". [quoted text clipped - 11 lines] >of the info he post is utterly useless, down right stupid and in a LOT >of case flat out dangerous. >>>It seems there are a lot of lurkers who appreciate >>>such information. It's not "all about you". [quoted text clipped - 11 lines] >>of the info he post is utterly useless, down right stupid and in a LOT >>of case flat out dangerous. > The Troll is you and your ilk, who as you put it, "love to hear > themselves". Quite frankly, you are nauseating and crude. > Please don't bother to respond (I won't be reading it), unless of > course you want to impress the other mental midgets of your class, or > even yourself, because I know " you love to look in that mirror." Even the second time around, it remains all about you. >>It seems there are a lot of lurkers who appreciate >>such information. It's not "all about you". >> >>If your ego is injured killfile the poster.- Hide quoted text - > > Never once said or implied it was "aal about me" a.shole. snip Displaying a petty little temper tantrum is making it all about you. Carry on then! > azwil...@gmail.com wrote: > >>It seems there are a lot of lurkers who appreciate [quoted text clipped - 10 lines] > > Carry on then! What's the matter nonsense and Steve, you don't like it when some one points out snotroll for what he is? You tow need to realize just how dangerous (and useless) a LOT of his information has been before you continue to defend him. Again, it is not "about me" its about esuring the lurkers in here are aware. So, if you don't like it or what I have to say, k/f me or ignore me, I could care less. >>azwil...@gmail.com wrote: >> [quoted text clipped - 19 lines] > if you don't like it or what I have to say, k/f me or ignore me, I > could care less. Oh you could, could you? :-) > azwil...@gmail.com wrote: > [quoted text clipped - 23 lines] > > Oh you could, could you? :-)- Hide quoted text - Care whether or not you ignore or k/f me? No I honestly do not. I do care however about the fact that time and time again your idol posts incorrect, dangerous and usless info that those unknowing and unsuspecting "lurkers" can and/or may follow. I do care about ensuring that no one is hurt or killed by such information. >>azwil...@gmail.com wrote: >> [quoted text clipped - 25 lines] > > Care whether or not you ignore or k/f me? No I honestly do not. Now try to figure out the logic involved in what you wrote and my reply. If you can't, then none of the rest of what you continue to write makes any sense either. > I do care however about the fact that time and time again your idol > posts incorrect, dangerous and usless info that those unknowing and > unsuspecting "lurkers" can and/or may follow. I never addressed the technical content of his posts, and I have no idols here. I worship the giant mothball, don'tchano! > I do care about > ensuring that no one is hurt or killed by such information. Your lack of clear thinking and absence of critical reading continues to be astonishing. You might try posting your version of "correct" information instead of simply flaming the guy and leaving the lurkers with what may or may not be wrong information. You do know that this stuff is all archived. So in the future it is likely that someone who retrieves information isn't going to be reading it in the threaded setting you're participating in. Buy I have to guess that you're hell bent on flaming while making up excuses for your bad childish conduct. > >>azwil...@gmail.com wrote: > >> [quoted text clipped - 56 lines] > Buy I have to guess that you're hell bent on flaming > while making up excuses for your bad childish conduct. If the drive shaft is 'the' possible problem area, again consider greasing the drive shaft slip spline joint. Under load & dry, the 00 & 01 GM joint has trouble sliding because it does not have the newer nickel spline plating. >>>>azwil...@gmail.com wrote: >>>> [quoted text clipped - 64 lines] > > because it does not have the newer nickel spline plating. To go a step beyond, I've once experienced a rather worn spline. A brand new drive shaft and spline was installed 7 months ago which fixed a different and longstanding vibration problem. The drive shaft vibration was masking this engine vibration. Again, I think the key symptom here is the service engine code of '5th cylinder misfire'. Will try some of the previous diagnostic techniques that were listed in previous posts about trouble shooting a sticky valve. Mike > > >>azwil...@gmail.com wrote: > > >> [quoted text clipped - 64 lines] > > because it does not have the newer nickel spline plating. > What's the matter nonsense and Steve, you don't like it when some one > points out snotroll for what he is? [quoted text clipped - 3 lines] > if you don't like it or what I have to say, k/f me or ignore me, I > could care less. I like his name, nonsense, totally fitting. Hence why I ignore the peon as he already does his self in. If he doesn't like what we write then he can killfile us. I will continue to set the record straight and I will continue to demand that Snoball answer for his stupidity. ----------------------------------- Snojob Follies: SBJ: Dumb brake question http://tinyurl.com/2ya3wo SBJ: Front wheel bearings-2000 Blazer?? http://tinyurl.com/2j44zv ----------------------------------- If the YellowSnoman wants to start improving his image he should start by owning up to his rabid stupidity in the above threads... "When I am clearly in error I will admit it while others do not so they are never wrong in their mind anyway." -Snoman (Oct 17 2006) Clearly in error... >>do not run it in overdrive unless you are in a nearly flat long stretch. >>the overdrive clutches are the weak spot in that 4l60e transmission. [quoted text clipped - 19 lines] > ----------------- > TheSnoMan.com Yeah yeah 93 octane - Oh Brother! Have you changed the pinion seal on the rear diff lately? The Dealership is adamant that the transmission is not causing the shake. I have the trailer package with the 3.73 gear ratio so the OD doesn't really strain at all. Code the service code reading of 5th cylinder missfire be caused by a sticky valve? Mike > do not run it in overdrive unless you are in a nearly flat long stretch. > the overdrive clutches are the weak spot in that 4l60e transmission. [quoted text clipped - 7 lines] > > With best regards, ajeeperman@comcast.net. E-mail: ajeeperman@comcast.net > The Dealership is adamant that the transmission is not causing the shake. I > have the [quoted text clipped - 4 lines] > > Mike There's a lot of homework that can be done before teardown. Generic list: Swap injectors. See if the problem follows the injector. Do a compression test. Make sure all electrical connections are clean and solid Make sure the injector is receiving electrical pulses Pull all the spark plugs and compare their appearances Thanks for the list of things to check before spending the $ on a tear down. One other item I forgot to mention earlier is that this shaking appears to occur when there is high manifold pressure. Mike > > The Dealership is adamant that the transmission is not causing the shake. I > > have the [quoted text clipped - 14 lines] > Make sure the injector is receiving electrical pulses > Pull all the spark plugs and compare their appearances >>>The Dealership is adamant that the transmission is not causing the > [quoted text clipped - 23 lines] >>Make sure the injector is receiving electrical pulses >>Pull all the spark plugs and compare their appearances > Thanks for the list of things to check before spending the $ on a tear down. > One other item > I forgot to mention earlier is that this shaking appears to occur when there > is high manifold pressure. > > Mike Not so very likely, but, better check for a broken engine mount as well. And as the engine rocks in the direction opposite torque, make sure electrical connections aren't affected. This could all be a wild goose chase, but these are easy compared to a tear down and you'd sure kick yourself if there was an easy fix discovered after a major expense. >I forgot to mention earlier is that this shaking appears to occur when there >is high manifold pressure. Tends to suggest a plug or injector misfire. Plug inspection is warranted and maybe new wires for plugs if they have never been changed. ----------------- TheSnoMan.com Check for TSB's here, there was one for this condition for the valves being too tight in the guides causing them to stick hence the misfire,. Not sure whether it went up to 99, symptoms are similar, once ign and injector issues are eliminated. > Thanks for the list of things to check before spending the $ on a tear > down. [quoted text clipped - 27 lines] >> Make sure the injector is receiving electrical pulses >> Pull all the spark plugs and compare their appearances > The Dealership is adamant that the transmission is not causing the shake. I > have the > trailer package with the 3.73 gear ratio so the OD doesn't really strain at > all. > Code the service code reading of 5th cylinder missfire be caused by a sticky > valve? Yes, a sticking valve could cause a missfire in cylinder #5. Easy 5 minute diagnosis with a labscope and a vacuum transducer. More common would be failing intake manifold gaskets, a plugged injector or crossfiring in the distributor cap. Is this diagnosis with a labscope and vacuum transducer something I could do, or should I ask a garage to do it. I have access to an oscilliscope, if that is the same as a labscope, and could alsways buy a vacuum transducer. Just need to know what to hook it up too and what to look for. Thanks. Mike > > The Dealership is adamant that the transmission is not causing the shake. I > > have the [quoted text clipped - 8 lines] > More common would be failing intake manifold gaskets, a plugged > injector or crossfiring in the distributor cap. |
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