S smitty22 New member Joined Jan 20, 2016 Messages 2 Reaction score 0 Points 0 Age 70 Jan 20, 2016 #1 Hello. I have a 1990 Chevy 1500 5.7. When I start it, it sounds like it's back firing throught the tail pipe. Plus it's running rough. But, when it warms up, it smooths out. Any thoughts on the cause? Thanks.
Hello. I have a 1990 Chevy 1500 5.7. When I start it, it sounds like it's back firing throught the tail pipe. Plus it's running rough. But, when it warms up, it smooths out. Any thoughts on the cause? Thanks.
zora Staff member Joined Apr 24, 2012 Messages 5,519 Reaction score 139 Points 63 Jan 20, 2016 #2 when is the last time you had a tuneup, spark plugs, cap, rotor, plug wires, air filter, gas filter? Typically it would be ignition related.
when is the last time you had a tuneup, spark plugs, cap, rotor, plug wires, air filter, gas filter? Typically it would be ignition related.
S smitty22 New member Joined Jan 20, 2016 Messages 2 Reaction score 0 Points 0 Age 70 Jan 20, 2016 #3 zora said: when is the last time you had a tuneup, spark plugs, cap, rotor, plug wires, air filter, gas filter? Typically it would be ignition related. Click to expand... Thanks for the reply. I've recently have changed everything except the air filter and fuel filter.
zora said: when is the last time you had a tuneup, spark plugs, cap, rotor, plug wires, air filter, gas filter? Typically it would be ignition related. Click to expand... Thanks for the reply. I've recently have changed everything except the air filter and fuel filter.
zora Staff member Joined Apr 24, 2012 Messages 5,519 Reaction score 139 Points 63 Jan 21, 2016 #4 How many miles are on the engine? Have you pulled the plugs to see if one of them is not firing? Have you done a compression test?
How many miles are on the engine? Have you pulled the plugs to see if one of them is not firing? Have you done a compression test?
