The truck always idled rough, even after I put a new long block engine in. I can't keep it idling, unless I unhook the vacuum line from the map sensor. When I do that, it cranks no problem and idles smooth. But I can barely drive it around the block that way, as it wants to bog down under a load. When it starts to bog the most I notice it puffs white smoke out of the exhaust. Also, the oil pressure stays high, between 50-60 on the gauge.
Since I've had the new motor, I put about 600 miles on it and then I overheated it and warped the heads. That's when the problem got worse. I replaced the water pump and heads and many sensors, O2, TPS, knock, oil pressure, temperature, EGR and MAP sensor.
When I remove the hose from the map sensor, the truck stores code 33. If I unplug the brown wire that puts it in "base timing mode", it also stores code 42 but doesn't seem to affect the idle at all. This is how I had it when I set the timing to 0°.
Any help is appreciated, I've been tinkering on this for over a year now to no avail.
Since I've had the new motor, I put about 600 miles on it and then I overheated it and warped the heads. That's when the problem got worse. I replaced the water pump and heads and many sensors, O2, TPS, knock, oil pressure, temperature, EGR and MAP sensor.
When I remove the hose from the map sensor, the truck stores code 33. If I unplug the brown wire that puts it in "base timing mode", it also stores code 42 but doesn't seem to affect the idle at all. This is how I had it when I set the timing to 0°.
Any help is appreciated, I've been tinkering on this for over a year now to no avail.
Aug 29, 2020 at 5:50 PM
