LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Notes on Timing Belt change -- '95-96

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Old 05-02-10, 01:19 PM
  #46  
tomeyeman
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Originally Posted by etex
Although tough, I would say these engines are quite delicate in that they have to be just right to perform properly. Logic would tell us the belt is on properly, but if it were me I would have to have the proper (OEM) belt with the three marks at the crank, the crank set at 0, and the cams properly aligned... all with corresponding belt markings. That's not necessarily a suggestion to you in this case... just a comment. You're the one in charge there, and if you stick with it I can tell you will win this one. Also, I can appreciate the frustration and desire to send it off for someone else to finish. Any lights on your panel while it is running?

No dash light on. No codes coming up. I have about 5 hours of daylight left and I've had the thing apart so many times now that the bolts practically jump off by themselves when I walk by .

I think I will take it apart just ONE more time and set everything at zero with no 50 degrees rotation (like I did originally 2 weeks ago) and as suggested and see what happens.
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Old 05-02-10, 02:05 PM
  #47  
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Take your time and look at it with fresh eyes. If a mistake was made the first time, it could be being repeated each subsequent time. If you're using an after-market timing belt you could be wasting your time but gaining lots of experience. I hope not. Watch your electrical sensors to be sure all are plugged in and are tight.
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Old 05-02-10, 02:15 PM
  #48  
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Originally Posted by billydpowe
I dont understand this 50 degree thing. look at my photos, with the TB lined up with the cams, my CS keyway was at 1 oclock, WHERE are yours?
The 50* thing is straight from TIS. If you didn't do it, great, but that is not Toyota's recommended procedure. I did say '95-96 in the title / first post. That should be '95-97, as they are all the same.

The 50* thing is after everything is set up properly, then the crank is turned so that the timing mark on the crank pulley lines up with the center of the bolt for the left idler pulley, just to make sure that's clear. With that orientation, the marks on the factory timing belt WILL line up with the notches on the cam and crank gears.

There CAN be issues with this procedure, if you do not follow everything correctly the first time. In my case, as I said, I got the cam gears out of sync with the crank. I worked very carefully and was lucky that I did get everything back to where it should be, BUT there was a time as I was turning the motor by hand that I did hear the sickening tap of a valve touching a piston. If you would do this, not pay attention to the exact orientation / relationship of the rotating parts, you CAN get to a point where you'll bend valves. Obviously I hope that's not the case here, but the "playing card in wheel spokes" worries me.
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Old 05-02-10, 02:28 PM
  #49  
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I have also seen posts on this forum about after-market plug wires not having the proper resistance and causing engine miss... as an afterthought.
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Old 05-02-10, 05:52 PM
  #50  
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Fellas........ I'm tapping out!

I finished putting the timing belt back to zero (no 50 degree rotation) and damn if it's not starting and running exactly the same. How can that be?! 4 belt changes and no improvement.

Come to think of it, if I'm rotating the crank 50 degrees with the belt on, I'm also moving the cams the same amount. I don't get how that is supposed to do anything. OR was the rotation supposed to be just the crank (ie. with the timing belt already removed, thus not moving the cams??).

Either way, doesn't matter to me. I'm done. I'm just out of ideas. Perhaps, like someone mentioned, maybe the aftermarket belt has incorrect markings??

Or perhaps I have already done some internal damange to the engine. If so, I won't shed a tear. The car has almost 180,000 miles and is 14 years old. I will take it to the Toyota dealer on Wednesday when I'm off work. They did a good job putting on a timing belt for me 3 years ago. So I'm confident they know what they are doing.

If I'm lucky, there's just a bad connector or wire. If not, hey, it is what it is, right.

I'll update when I find something out.
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Old 05-03-10, 02:57 AM
  #51  
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Originally Posted by tomeyeman

Come to think of it, if I'm rotating the crank 50 degrees with the belt on, I'm also moving the cams the same amount. I don't get how that is supposed to do anything. OR was the rotation supposed to be just the crank (ie. with the timing belt already removed, thus not moving the cams??).
Yes, turning the crank will turn the cams, and they'll all continue to have the same relationship. The reason for the 50* turn (according to the Toyota manual) is to make sure the pistons/cams aren't in danger of touching each other.

Good luck with Toyota, please keep us updated. I was in almost the same position and I was wondering how a dealership would handle a situation like that.
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Old 05-03-10, 06:01 AM
  #52  
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kick the car for me before you get rid of it
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Old 05-03-10, 12:54 PM
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Originally Posted by Thermactor
kick the car for me before you get rid of it

Okay

A little update:

I was messing around during lunch time. Started the car and manged to keep it running at about 200 rpm (wasn't easy) and messed around taking off vacuum hoses and putting them back on just to see if there would be any difference.

There was no real change in engine performance except it cut off a few times. But when I was done, I noticed the "check engine" light on this time for the first time. Hooked up the OBD scanner and got PO300 'Multiple cyl misfire'. Specifically # 1, #2, #4 and # 8.

What's up with that? Could it be just from messing around with the vaccum/idle or is this a tell-tale sign of a serious problem? Hey did I mention I changed out the timing belt? HA, HA, HA, HA..........

I can't wait until Wednesday to get this thing off my hands for a while.
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Old 05-03-10, 02:18 PM
  #54  
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That sounds like a problem with one of the coils, don't give up yet!
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Old 05-03-10, 03:08 PM
  #55  
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Originally Posted by tomeyeman
Okay

A little update:

I was messing around during lunch time. Started the car and manged to keep it running at about 200 rpm (wasn't easy) and messed around taking off vacuum hoses and putting them back on just to see if there would be any difference.

There was no real change in engine performance except it cut off a few times. But when I was done, I noticed the "check engine" light on this time for the first time. Hooked up the OBD scanner and got PO300 'Multiple cyl misfire'. Specifically # 1, #2, #4 and # 8.

What's up with that? Could it be just from messing around with the vaccum/idle or is this a tell-tale sign of a serious problem? Hey did I mention I changed out the timing belt? HA, HA, HA, HA..........

I can't wait until Wednesday to get this thing off my hands for a while.
your timing is probably fine but you've either got a bunch of spark plug wires plugged into the wrong places or one of your distributor rotors is off by ninety degrees
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Old 05-03-10, 03:45 PM
  #56  
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Originally Posted by Thermactor
your timing is probably fine but you've either got a bunch of spark plug wires plugged into the wrong places or one of your distributor rotors is off by ninety degrees
Hmmm......now THAT'S something I can fix. I'm 99.9% sure the plug wires are correct. Checked them about 5 times. I just switched out my old (good) coil and there was no change. Distributor Rotors...hmmmmm?

I know I have the metal tip pointed at the notches in the housing. I assume that is the way they go. I suppose I could flip it and see what happens. Couldn't hurt at this point. I still have a little skin left on my knuckles .

Wait, rotor off by 90 degrees? I believe they only go one way or the other. There is 2 screws so I can only flip them 180 degrees or back. Is that what you meant?
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Old 05-03-10, 04:09 PM
  #57  
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Originally Posted by tomeyeman
Hmmm......now THAT'S something I can fix. I'm 99.9% sure the plug wires are correct. Checked them about 5 times. I just switched out my old (good) coil and there was no change. Distributor Rotors...hmmmmm?

I know I have the metal tip pointed at the notches in the housing. I assume that is the way they go. I suppose I could flip it and see what happens. Couldn't hurt at this point. I still have a little skin left on my knuckles .

Wait, rotor off by 90 degrees? I believe they only go one way or the other. There is 2 screws so I can only flip them 180 degrees or back. Is that what you meant?
right, i meant 180 degrees
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Old 05-03-10, 04:14 PM
  #58  
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Originally Posted by Thermactor
right, i meant 180 degrees
So which way do they go? Does anyone know for sure?

Damn, I just discovered that I didn't put the plug wires into the little holders last night (it was late) and my number 6 wire got chewed up by the cam pulley. Oh well, I guess that sorta explains why it didn't show a code until I ran it for a while (took a bit for the wire to get half eaten through). No apparant problem with the other wires though.

I guess I will just go ahead and buy another new set and give them a try. Sorta have to now anyway. If I can find out which way the rotors are supposed to go I'll change them around.
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Old 05-03-10, 05:58 PM
  #59  
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Ahhhhhhhhhhhhhhhhhhhhhhhhh..................................

I changed back to my old spark plugs: No difference

I put on new plug wires: No change

I thought, hey maybe I got bad (new) distributor caps so I changed them back to my originals: No change

Ho hum. My hands hurt. My brain hurts. My wallet hurts ($100 for new plug wires because I was an idiot and tore up my other new ones).
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Old 05-03-10, 09:26 PM
  #60  
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I wish I lived closer to you. I could have had your problem figured out in an hour.
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