john&michele Posted May 9, 2011 Share Posted May 9, 2011 the timing belt broke while driving and bent three exhaust valves on the left side . i had them replaced and had the head checked out , it was ok so i replaced it and the timing belt . when i started it ,it ran good for a few minutes and then it started to miss . i checked everything i could think of that i may or may not have done right . it still has a miss and runs like (excuse my language)@!*% .... can you help? Link to comment Share on other sites More sharing options...
Kingman Posted May 9, 2011 Share Posted May 9, 2011 Do a compression test. What kind of head gasket was used? If it's a Fail-Pro that might be the issue. They're known to blow out on VGs really quickly. Link to comment Share on other sites More sharing options...
john&michele Posted May 9, 2011 Author Share Posted May 9, 2011 Do a compression test. What kind of head gasket was used? If it's a Fail-Pro that might be the issue. They're known to blow out on VGs really quickly. i did a compression its good . ive check it again and it still has a miss . could the exhaust cause it to run badly ? i no it makes noise but could it make it miss? also if the distributer is off by 1 tooth could that be it also ? cause when i time it it will miss at 2 or 3 degrees either way . Link to comment Share on other sites More sharing options...
Kingman Posted May 9, 2011 Share Posted May 9, 2011 (edited) Exhaust won't make it run bad. Being a tooth of on the distributor will though. Did you put the distributor in like this - right arrow: (orange dot is alignment dimple) Or like this - left arrow: Edited May 9, 2011 by Kingman Link to comment Share on other sites More sharing options...
jj big shoe Posted May 13, 2011 Share Posted May 13, 2011 Checked your vac lines really well? It'll run fine at startup then once it warms up the fuel map changes and if there's a vac leak it could start coughing and sputtering. Link to comment Share on other sites More sharing options...
JamesRich Posted May 13, 2011 Share Posted May 13, 2011 Pause for a quick Kingman, On a VG30I head, are the intake ports round with the little hump at the top like the VG30E heads? Or do they have just a round port? I'm assuming they have the same head even though the little hump at the top of the port isn't needed for the throttle body injection. James Link to comment Share on other sites More sharing options...
Kingman Posted May 13, 2011 Share Posted May 13, 2011 Yes, they are the same. Link to comment Share on other sites More sharing options...
sewebster Posted May 13, 2011 Share Posted May 13, 2011 (edited) Putting the distributor in "wrong" will just prevent you from getting the proper timing. If you can get it to 15BTDC then you should be good. Taking everything apart and putting it back together again could just have revealed a simple problem in your ignition or something. Check all the usual suspects... plugs, wires, rotor, cap, injector (I guess there is one on a TBI?), fuel pressure etc. Also, are you super sure the timing belt is on right? Did you count the teeth on the belt between the marks on the sprockets? Edited May 13, 2011 by sewebster Link to comment Share on other sites More sharing options...
Kingman Posted May 14, 2011 Share Posted May 14, 2011 He says he's unable to get the proper timing. "Off by 2-3 degrees." I've put my distributor in wrong, it ran very similar to what's been said and I couldn't get the base timing set correctly. Took it back out and realigned it, bingo. It takes 5 minutes to pull the dizzy so I think it's worth checking. Link to comment Share on other sites More sharing options...
sewebster Posted May 14, 2011 Share Posted May 14, 2011 I thought he was saying it would start missing when he detuned it by 2-3 degrees. Anyway, that sounds a bit unexpected to me. The symptoms he describes sound a little worse than a slight timing problem. But it only makes sense to put the distributor in correctly and time it properly... Link to comment Share on other sites More sharing options...
unccpathfinder Posted May 14, 2011 Share Posted May 14, 2011 yea sounds like timing is off...or you did what i did nad swapped 2 plugs and are running off of 4 cylinders... Link to comment Share on other sites More sharing options...
JamesRich Posted May 16, 2011 Share Posted May 16, 2011 Yes, they are the same. OK Thanks! James Link to comment Share on other sites More sharing options...
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