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Possible bent valve??


Smitty1457
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Galant VR-4 org Post #: 1037937 posted 12/05/11 12:17 AM     Remind Me!  Send Private Message   Edit Post      
I dont usually post with problems but this one has me stumped. I just finished up with 272 cam and SMIM install. Timing belt is dead on, I double checked. I got spark and fuel but the engine runs like it is wayyy out of time. I had to dial in 50* of cranking advance on MS to get it to fire up. The only thing I can think of is that when i was first installing the cams I bolted the intake cam in upside down with the motor at TDC. (I dont know where my head was) I noticed it right away and corrected it. I didnt roll the motor over at all either. Im gonna run a compression test tomorrow when i get my tester back.

My question is, Any chance I bent a valve? Also, anyone have any other ideas? Got fuel, got spark, timing is on, CAS is right, running MS2 with SD.

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thedsmguy
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Galant VR-4 org Post #: 1037940 posted 12/05/11 12:40 AM     Remind Me!  Send Private Message   Edit Post      
Extreme intake leak? I once bought a car from a guy who had put a stock intake back on his car and left a washer in one of the lower bolts to the manifold, he couldn't see that it was leaking and thought the car was completely broke. A boost leak test pointed it out right away.

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Smitty1457
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Galant VR-4 org Post #: 1037942 posted 12/05/11 12:45 AM     Remind Me!  Send Private Message   Edit Post      
Speed density setup. I sprayed some solvent around and nothing changed anyway.


Edited by Smitty1457 (12/05/11 12:48 AM)

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4thStroke
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Galant VR-4 org Post #: 1037944 posted 12/05/11 01:34 AM     Remind Me!  Send Private Message   Edit Post      
Did you try shutting off one cylinder (pull a plug cap or unclip the injector) while it was running to see when the idle would or would not change?

I'm not sure that a bent valve would call for more timing.

Call me tomorrow some time after 6:00pm.

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Smitty1457
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Galant VR-4 org Post #: 1037945 posted 12/05/11 01:40 AM     Remind Me!  Send Private Message   Edit Post      
Its just cranking timing adv so it can get started. It was running driving car before I took it apart. Also I am getting fuel and spark on all cylinders

Ill be in a class from 5-9.


Edited by Smitty1457 (12/05/11 01:41 AM)

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Smitty1457
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Galant VR-4 org Post #: 1037970 posted 12/05/11 04:30 AM     Remind Me!  Send Private Message   Edit Post      
In the morning im gonna triple check the timing and compression test.

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Smitty1457
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Galant VR-4 org Post #: 1038188 posted 12/06/11 01:29 AM     Remind Me!  Send Private Message   Edit Post      
Im an idiot. Timing belt was half a tooth off. I was looking at the crank marks from a bad angle I guess. First time I screwed that up. I re-timed it and that brought up another question..

Why is it that when I turn the engine over 6 times counter-clockwise it ends up half a tooth off, but when I turn it over clockwise like the engine actually turns, its dead on? VFAQ says to turn it CCW. Whats the deal here?

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donniekak
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Galant VR-4 org Post #: 1038189 posted 12/06/11 01:46 AM     Remind Me!  Send Private Message   Edit Post      
Don't ever turn the engine over backwards. It puts the slack on the side of the belt without a tensioner, and can jump time.

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turbowop
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Galant VR-4 org Post #: 1038190 posted 12/06/11 01:49 AM     Remind Me!  Send Private Message   Edit Post      
You shouldn't rotate the motor counterclockwise with the timing belt on. It is meant to only run clockwise. I'm pretty sure the vfaq only mentions spinning a couple things CCW to line things up or the exhaust cam moving CCW a couple degrees when the belt is removed, but otherwise, with the belt on, only turn the motor over clockwise. Spinning it clockwise allows the tensioner to work properly. *edit* Donnie beat me to it.

And it's not really possible to be a half tooth off, since we don't have half teeth on the belt or sprockets. You're either a full tooth off, or not off at all.



-Mark

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Edited by turbowop (12/06/11 01:50 AM)

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grocery_getter
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Galant VR-4 org Post #: 1038192 posted 12/06/11 01:52 AM     Remind Me!  Send Private Message   Edit Post      
There is only 1 mention where it says spin 1/4 turn CCW then 6 turns CW. Where did you see the vfaq mention 6 turn CCW?



Andre
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Smitty1457
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Galant VR-4 org Post #: 1038195 posted 12/06/11 02:30 AM     Remind Me!  Send Private Message   Edit Post      
I take the previous statement back. You guys are right. My fault for not reading correctly. ADD is a mofo for me. Its a surprise I've made it this far... Dang.

I thought that is what weird it would say that. Didnt make sense. Good thing I asked.


Edited by Smitty1457 (12/06/11 02:32 AM)

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Smitty1457
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Galant VR-4 org Post #: 1041836 posted 12/24/11 07:16 PM     Remind Me!  Send Private Message   Edit Post      
Ok guys, I took a break for awhile and got back to it. Compression is good, 160-165 across the board. I even went as far as to put the stock cams back in. No change still. When it idles (when I can get it to) its really rough and low vacuum under 10in. Again, I have fuel and spark on all 4. Im really starting to on this one. Any and all ideas are welcome.

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TRBODSM
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Galant VR-4 org Post #: 1041842 posted 12/24/11 08:26 PM     Remind Me!  Send Private Message   Edit Post      
I know this is stupid and I've done it before that's why I am bringing it up on this. Are the spark plug wires Hooked up in the right firing order. Seems like two are switched out causing the car to run/idle like shit but still start.

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Smitty1457
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Galant VR-4 org Post #: 1041949 posted 12/25/11 08:59 PM     Remind Me!  Send Private Message   Edit Post      
Ive checked and rechecked that.

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4thStroke
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Galant VR-4 org Post #: 1041980 posted 12/26/11 02:23 AM     Remind Me!  Send Private Message   Edit Post      
I'm still a bit skeptical about the cam timing. Give me a call tomorrow, I might be able to stop by, I have tomorrow off.

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MuffinMan7580
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Galant VR-4 org Post #: 1044680 posted 01/09/12 03:13 PM     Remind Me!  Send Private Message   Edit Post      
CAS 180 out?



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Smitty1457
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Galant VR-4 org Post #: 1045018 posted 01/11/12 12:37 AM     Remind Me!  Send Private Message   Edit Post      
nope.

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Wizardawd
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Galant VR-4 org Post #: 1045410 posted 01/13/12 01:59 PM     Remind Me!  Send Private Message   Edit Post      
When you remove the timing belt, did you remove the crank sprocket and the shutter plate?

If you did, take it apart again and make sure that the plate was not installed backwards. Seen it a lot before.

Wiz



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4thStroke
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Galant VR-4 org Post #: 1045734 posted 01/15/12 08:06 PM     Remind Me!  Send Private Message   Edit Post   
Wiz makes a good point. I saw that happen a couple times on customer motors when I had to tear them down for rebuilds.

Have you had the chance to get Trav over there and look at it?

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