Wheelz
October 14th, 2013, 02:14 PM
I know this isn't the forum for general troubleshooting car problems, but this is the only forum I'm a member of relating to my truck. If this needs to be moved, please do.
My problem is, when I drive through puddles/rain or even go through an undercarriage car wash, I get a terrible misfire under part throttle and idle. I can roll into the throttle and feel cylinders start to fire. I can feel three different cylinders begin to fire at different points, each as I push farther into the throttle. Its pretty consistent behavior when its wet. When all the cylinders light, it takes off like a champ, which makes me look like a retard trying to drive easy in town. It doesn't make sense that it could be a fuel problem because of how I can make more cylinders fire by just giving it more throttle, but I can't figure out where to start beyond it being water getting somewhere it shouldn't. I'm a Test Engineer, I'm supposed to know how to troubleshoot problems, but this has me baffled. I don't know what to log to help me narrow down where the problem is. I also just changed plugs and wires thinking that would help, and no joy; exact same symptoms next time it rained. 104k mi on the clock
I then let it sit in the garage an hour and it ran just fine when I ran to get dinner, on wet roads. granted I was dodging anything that looked like a water puddle. I did not notice the truck doing this before I installed the headers, and it was about two months after the install before I took it through the car wash or got a rain. The truck runs great when its dry.
Here is my tune and a log just so you can see what I'm logging. My V2 was full (kept forgetting to bring it in to pull the files off of it) so I haven't gotten a log of it misbehaving, but watching the data come in nothing stands out. COS 03 and not using the MAF, but its still hooked up for the IAT sensor
I'm also running OL with all o2 sensors unplugged
15974
15975
My problem is, when I drive through puddles/rain or even go through an undercarriage car wash, I get a terrible misfire under part throttle and idle. I can roll into the throttle and feel cylinders start to fire. I can feel three different cylinders begin to fire at different points, each as I push farther into the throttle. Its pretty consistent behavior when its wet. When all the cylinders light, it takes off like a champ, which makes me look like a retard trying to drive easy in town. It doesn't make sense that it could be a fuel problem because of how I can make more cylinders fire by just giving it more throttle, but I can't figure out where to start beyond it being water getting somewhere it shouldn't. I'm a Test Engineer, I'm supposed to know how to troubleshoot problems, but this has me baffled. I don't know what to log to help me narrow down where the problem is. I also just changed plugs and wires thinking that would help, and no joy; exact same symptoms next time it rained. 104k mi on the clock
I then let it sit in the garage an hour and it ran just fine when I ran to get dinner, on wet roads. granted I was dodging anything that looked like a water puddle. I did not notice the truck doing this before I installed the headers, and it was about two months after the install before I took it through the car wash or got a rain. The truck runs great when its dry.
Here is my tune and a log just so you can see what I'm logging. My V2 was full (kept forgetting to bring it in to pull the files off of it) so I haven't gotten a log of it misbehaving, but watching the data come in nothing stands out. COS 03 and not using the MAF, but its still hooked up for the IAT sensor
I'm also running OL with all o2 sensors unplugged
15974
15975