rough Idle from a 300
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Hey guys, I think I have found the problem. I was spraying carb cleaner on the carb and intake to see if I could find the source of vacuum leak. When I sprayed the very last intake port on the back/end of the motor the engine smoothed out and ran normal. I did this over and over to be sure and it seems the last port is not sealing to the head correctly. Now I have re-tightened all the intake bolts and it helped a bit but did not stop the problem. Should I double gasket the intake gasket or what?
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Joined: Jul 2004
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From: Northern California
With that info, it sounds like you have a warped intake, or exaust manifold.
The original exaust manifold did not have a gasket, only the intake manifold had one.
If you got one of those combination intake exaust manifold gaskets, this may be your problem as it may not allow the intake to seat properly.
Also, did you torque the bolts properly in the correct order?
The original exaust manifold did not have a gasket, only the intake manifold had one.
If you got one of those combination intake exaust manifold gaskets, this may be your problem as it may not allow the intake to seat properly.
Also, did you torque the bolts properly in the correct order?
Post Fiend
Joined: Jul 2004
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From: Northern California
The 300-6 is a great little engine in it's own right, and there are people that will have nothing else in these trucks. I am one of these people. For what I do with my truck, I will not have anything different.
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So... what should I do? should I have the intake machined or should I try a different gasket set for it?
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You should figure out why it's not sealing, weather its the wrong gasket (As was mentioned previously) or the Intake or head is warped.
I would pull it back off and use a straight edge to determine if its warped and find an OEM gasket set for it.
I would pull it back off and use a straight edge to determine if its warped and find an OEM gasket set for it.
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Ok I guess I will try the new gasket and seeing if the intake is straight. Should I only run an Intake gasket this time if the intake checks out and leave the exaust off this time?
Last edited by 84GOAT300i6; May 30, 2011 at 08:24 PM. Reason: adding info
Post Fiend
Joined: Jul 2004
Posts: 8,786
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From: Northern California
Use a straight edge on the head, too - trust nothing, even if it is brand new.