1988IndySierra
New member
It's a 1988 Sierra SLE 5.7 2WD - I bought for cheap because it was a nice truck and my trusty little S10 Blazer died - and I just put in a good used 5.7 from a 1991 Sierra. The truck had sat for 8 months before I had bought it due to water in the oil and spun bearings, it ran but sounded horrible and smoked bad with white/blue oil smoke. The engine I put in ran good and didn't smoke in the other truck but now it has a hesitation at part throttle and smokes like a chimney when above 140+ degrees engine temp.
The smoke is blue/white oil smoke.
The only three parts I reused from the old engine was the throttle body, exhaust and oil pressure senders.
Compression in all 8 cylinders is 150-160.
No codes at all. I've done some datalogging using WinALDL and everything looks good, all sensors are within range.
Plugs look good, No. 7 was a little oily but not fouled. There is some oil dripping from the front of the catalytic converter but it seems to be coming from inside the exhaust as there's not a drip anywhere and it's not running down the crossover pipe.
The cat doesn't smell but would a bad cat cause it to smoke?
The smoke is blue/white oil smoke.
The only three parts I reused from the old engine was the throttle body, exhaust and oil pressure senders.
Compression in all 8 cylinders is 150-160.
No codes at all. I've done some datalogging using WinALDL and everything looks good, all sensors are within range.
Plugs look good, No. 7 was a little oily but not fouled. There is some oil dripping from the front of the catalytic converter but it seems to be coming from inside the exhaust as there's not a drip anywhere and it's not running down the crossover pipe.
The cat doesn't smell but would a bad cat cause it to smoke?