matttahoe53
I'm Awesome
So yesterday as I was heading home from work my 99 tahoe started acting up. The truck would lose power under load, the engine was knocking, and under "harder" acceleration the exhaust would backfire on the passenger side. So I get home ok and on the way stop at autozone to have my codes read. This is what I got.
P0101
P0102
P0300
P0327
P0171
P0174
So I get home and did some research in preparation for today. First up I check the maf sensor. I clean it reinstall it and no change. Head out to autozone to get a new MAF sensor, install it, truck ran slightly better but still this was not the fix. Next I checked the fuel pressure. With just the pump on it held steady at 54 psi. I turned the engine on revved the engine, the pressure would jump to 60-62 psi and settle back in at around 54. Turned everything off and the fuel pressure remained constant. So, I don't think it's a clogged filter or bad fuel pump. The last thing I did was pulled the plugs of the passenger side since that seemed to be the side that was missing and is the only side that backfires (I have a true duel exhaust). From front to back, the first two plugs looked fine, the third was a little fouled, and the fourth was nasty. So I head back to the store to buy new plugs. When I came back I decided to check my header bolts. The front ones were tight but the rear ones were loose with the furthest bolt to the back needing hand tightening to get it started. I throw the new plugs in and while the truck has definitely smoothed out its idle, under load it still bogs down and back fires.
I am at a loss now. My next thoughts are spider issue, o2 sensor issue, or a clogged catalytic converter. What are some other possibilities?
P0101
P0102
P0300
P0327
P0171
P0174
So I get home and did some research in preparation for today. First up I check the maf sensor. I clean it reinstall it and no change. Head out to autozone to get a new MAF sensor, install it, truck ran slightly better but still this was not the fix. Next I checked the fuel pressure. With just the pump on it held steady at 54 psi. I turned the engine on revved the engine, the pressure would jump to 60-62 psi and settle back in at around 54. Turned everything off and the fuel pressure remained constant. So, I don't think it's a clogged filter or bad fuel pump. The last thing I did was pulled the plugs of the passenger side since that seemed to be the side that was missing and is the only side that backfires (I have a true duel exhaust). From front to back, the first two plugs looked fine, the third was a little fouled, and the fourth was nasty. So I head back to the store to buy new plugs. When I came back I decided to check my header bolts. The front ones were tight but the rear ones were loose with the furthest bolt to the back needing hand tightening to get it started. I throw the new plugs in and while the truck has definitely smoothed out its idle, under load it still bogs down and back fires.
I am at a loss now. My next thoughts are spider issue, o2 sensor issue, or a clogged catalytic converter. What are some other possibilities?