Went to chevrolet to get a diagnose on exhaust leak we were told either we have a broken bolt or missing a bolt, would this mess with the way our car runs cause sense we noticed our car runs but not like it use too? when we go out and you press on the gas its good till you hit 15mph and then it will take it a few seconds to get it to 35mph.
Whistling noise coming from the engine bay.
Excessive vibrations originating from the exhaust system.
Poor fuel economy.
Check Engine Light (CEL)
Rattling noise coming from the catalytic converter
All these are early signs and pointers and Symptoms of Exhaust Leak.
Loss of Performance
Since the manifold is an important component of the engine's exhaust system and helps ensure that the engine receives the proper amount of backpressure (the pressure developed by the exhaust system as gasses are evacuated), a cracked manifold can negatively impair engine performance. A crack is, in essence, a vacuum leak and may prevent all of the engine functions from operating correctly..
plus go to this link and have a read up will help you..
Symptoms of Cracked Exhaust Manifold
SOURCE: 93 Cavalier runs real rough
sounds like you left something out. check to see if you plugged in all the sensors and plugs, then check for any vacuum lines that were not replaced or may have been broken
SOURCE: 1998 gmc 4x4 runs poorly and sounds like a vacume,air leak .
The 5.0l and 5.7l all have this problem at some time.The lower intake gaskets are bad.and are sucking air which will cause the eng. to idle high and sound like like there is a cylinder or two that are not firing and you also may loose antifreeze.The upper intake is black/plastic and the lower is aluminum.Tightening the lower intake bolts may seem to help but once the gaskets are blown,they need to be replaced.If its sucking more air through the bad gasket than the TBI it will not get the right air to gas mixture.Check that all vacuum hoses are in good shape and the vacuum line that runs from the top of the upper intake to the brake booster is sealed good in the intake.Hope this gives you a better idea.
SOURCE: experiencing a
it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise
SOURCE: broken bolts on exhaust manifold 6.0 liter chevy
These bolts usually have become very hard and brittle from the high temperatures. You will need carbide drill bits to drill into the bolt remains for insertion of an 'easy-out' tool. 'Penetrating oil' squirted into the threads may help remove the ends.
SOURCE: cylinder head bolt torque chevrolet 3.4
here is the troque spec for the cylinder heads.
Cylinder Head Bolt
60 N·m
44 lb ft
95 degrees
Cylinder Head Bolt
60 N·m
44 lb ft
95 degrees
Cylinder Head Bolt
60 N·m
44 lb ft
95 degrees
first pass 44 ftlbs
second pass 95 degrees
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