ok i have a 94 burban with a tbi 5.7 i recently acquired a poping sound out of the exhaust i think it is in the valve train. Any ideas or common problems with these motors anyone knows of thanks
CK5
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exhaust popings sound
- Thread starter dheavychevy38
- Start date
slimlynn1
1/2 ton status
When does it make the popping sound, is it all the time or only when cold?
all the time plus if you give it gas it back fires through the passenger side of the tbi
kyser_soze
1/2 ton status
It sounds like you have to adjust your valves.
lotsa things can do it...
Could be a valve problem,an exhaust valve might be burnt,or a valve spring broke,a lifter might have pumped up and is holding a valve open.,a broken rocker arm,bent pushrods,maybe a flat cam lobe--could be spark related too,timing off,bad plug wire,fouled plug,distibutor cap cracked,bad rotor,--also an air pump can cause backfiring if the diverter valve on it fails(not all trucks have AIR pumps)....time to get the tools out..good luck..
Could be a valve problem,an exhaust valve might be burnt,or a valve spring broke,a lifter might have pumped up and is holding a valve open.,a broken rocker arm,bent pushrods,maybe a flat cam lobe--could be spark related too,timing off,bad plug wire,fouled plug,distibutor cap cracked,bad rotor,--also an air pump can cause backfiring if the diverter valve on it fails(not all trucks have AIR pumps)....time to get the tools out..good luck..
thanks guys i am giveing it a full tune up and checking timeing on saturday i will also yank the valve covers and give it a look
