Hey all. New member here, joined the board to see if I could get some insight from 4 runner owners about my issue. The truck is a 2000 with 112,345 miles on her.
Somehow I am getting oil up into my intake. First noticed the issue after a stint of about 30 mins on the highway at about 70mph. Came home, went in the house, and the following morning at startup I got a puff of smoke out of the exhaust. This progressed over the last few months. Finally got time today to dig into the issue to try and figure it out.
Changed the pcv with no results. Today took apart the intake tube and upper half of the intake manifold to find this...
Solid amount of oil laying in the intake runners. Also a large amount of oil was in the bottom of the intake resonator box, which I had to drain out.
Checked all of the incomming vaccum lines and narrowed it down to what I think could only be two possibilities. Either the upper hose which comes off of the back driver side of the cylinder head or the pcv valve hose. I popped the back hose off at idle and that seems to be sucking, not pushing air out so not sure oil could be evacuating that way.
The truck idles and runs fine around town. Just after highway jaunts at above 70mph does she smoke after a cool down and refire. I also noticed at times what one would think was detonation or spark plug knock right after getting off the highway and pulling away from a stoplight. At first I thought valve seats were the issue, but then there shouldnt be oil up in the intake.
The only other reason I can think of would be blow by. Some other curious symptoms which have developed is a loss of overall acceleration and occationally right after startup the truck will hesitate no matter how far you push the throttle for about 50 seconds then it idles up and is fine.
Sorry for the long post, just wanted to get all of the info I've gathered into it. Any insight and direction you guys can give me would be mush appreciated!!!!!!!
Somehow I am getting oil up into my intake. First noticed the issue after a stint of about 30 mins on the highway at about 70mph. Came home, went in the house, and the following morning at startup I got a puff of smoke out of the exhaust. This progressed over the last few months. Finally got time today to dig into the issue to try and figure it out.
Changed the pcv with no results. Today took apart the intake tube and upper half of the intake manifold to find this...
Solid amount of oil laying in the intake runners. Also a large amount of oil was in the bottom of the intake resonator box, which I had to drain out.
Checked all of the incomming vaccum lines and narrowed it down to what I think could only be two possibilities. Either the upper hose which comes off of the back driver side of the cylinder head or the pcv valve hose. I popped the back hose off at idle and that seems to be sucking, not pushing air out so not sure oil could be evacuating that way.
The truck idles and runs fine around town. Just after highway jaunts at above 70mph does she smoke after a cool down and refire. I also noticed at times what one would think was detonation or spark plug knock right after getting off the highway and pulling away from a stoplight. At first I thought valve seats were the issue, but then there shouldnt be oil up in the intake.
The only other reason I can think of would be blow by. Some other curious symptoms which have developed is a loss of overall acceleration and occationally right after startup the truck will hesitate no matter how far you push the throttle for about 50 seconds then it idles up and is fine.
Sorry for the long post, just wanted to get all of the info I've gathered into it. Any insight and direction you guys can give me would be mush appreciated!!!!!!!
