Just picked up a super clean 99 2wd 4 cyl. and 5 speed manual tran. 4-runner. Has 209k miles showing, and I have all the original receipts from day one. I read through them and nothing unusual. This car was driven only highway miles out in California since new.
The car is very hard to start when cold, and has a low idle (around 500 - 550). She wants to die out when coming to a stop when cold, but runs super smooth when warm, but still idles too low.
I read in the FSM and it says low idle check fuel system. So this weekend I figured I'd start with the tank/pump and see if it is clean inside. My thoughts were that perhaps the truck sat for a bit too long and had tarnish or sediment clogging the sock. I have a lift inside my shop so no big deal to drop the tank. I wanted to check the fuel pressure first but for the life of me I can't find a port to hook up a gauge. I did pinch off the return line and the idle got rougher, but still too low.
So I dropped the tank and pulled out the pump. To my surprise it was shiny clean inside. Not a speck of debris or any sign of tarnish. I put the tank back in and the engine fired up same as before. No change to idle.
My next thought was to run some sea foam thru the induction system via the brake hose. I did and could not tell any difference to the rough and low idle. I pulled the MAF and hit with some MAF cleaner. No change either.
This low idle isn't intermittent. It is a constant. I could use some direction as to what else to check. Crank sensor? EGR?
This engine is spotless BTW. It is 100% unmolested with new wires and plugs. According to the receipt it has iridium plugs IIRC. Could that be an issue? I didn't pull them to look since they were brand new.
I didn't have a CEL until I ran the seafoam thru. I'm going to put a code reader on it and see what I get but am thinking it will go away once reset.
The car is very hard to start when cold, and has a low idle (around 500 - 550). She wants to die out when coming to a stop when cold, but runs super smooth when warm, but still idles too low.
I read in the FSM and it says low idle check fuel system. So this weekend I figured I'd start with the tank/pump and see if it is clean inside. My thoughts were that perhaps the truck sat for a bit too long and had tarnish or sediment clogging the sock. I have a lift inside my shop so no big deal to drop the tank. I wanted to check the fuel pressure first but for the life of me I can't find a port to hook up a gauge. I did pinch off the return line and the idle got rougher, but still too low.
So I dropped the tank and pulled out the pump. To my surprise it was shiny clean inside. Not a speck of debris or any sign of tarnish. I put the tank back in and the engine fired up same as before. No change to idle.
My next thought was to run some sea foam thru the induction system via the brake hose. I did and could not tell any difference to the rough and low idle. I pulled the MAF and hit with some MAF cleaner. No change either.
This low idle isn't intermittent. It is a constant. I could use some direction as to what else to check. Crank sensor? EGR?
This engine is spotless BTW. It is 100% unmolested with new wires and plugs. According to the receipt it has iridium plugs IIRC. Could that be an issue? I didn't pull them to look since they were brand new.
I didn't have a CEL until I ran the seafoam thru. I'm going to put a code reader on it and see what I get but am thinking it will go away once reset.