Automan2164 Posted October 7, 2011 Share Posted October 7, 2011 Well, last week I had a truck come into the shop that had an interesting problem that lent itself to some cool pics. Figured I would see if you guys could figure it out. I'll set the stage: 2003 Chevy 2500 HD 6.0L Vortec Gas V8, Auto, 4x4 87,000 Miles, Municipal vehicle since new Has always had sort of a stumble at idle since I've worked here. Seemed to follow moisture in the air. Came in to the shop on a wet day with a flashing check engine light and falling all over itself. I'll answer any questions you guys ask to see if anyone can get to the root cause. Rob :cheers: Link to comment Share on other sites More sharing options...
Fezzik Posted October 7, 2011 Share Posted October 7, 2011 I'll start with a simple one, what did the code say? Link to comment Share on other sites More sharing options...
Automan2164 Posted October 7, 2011 Author Share Posted October 7, 2011 P0300, Random multiple misfire. Rob Link to comment Share on other sites More sharing options...
Fezzik Posted October 7, 2011 Share Posted October 7, 2011 that's new enough where it probably doesn't have a cap and rotor, but individual ?coils? right? Link to comment Share on other sites More sharing options...
Automan2164 Posted October 7, 2011 Author Share Posted October 7, 2011 Coil near plug, each cylinder has its own coil and wire about one foot long. Original plugs and wires. Rob Link to comment Share on other sites More sharing options...
Pete M Posted October 7, 2011 Share Posted October 7, 2011 any diesel fuel get in that tank? :rotfl2: Link to comment Share on other sites More sharing options...
Automan2164 Posted October 7, 2011 Author Share Posted October 7, 2011 Driver filled it up Friday, now Wednesday. Tank smells like gas. Rob Link to comment Share on other sites More sharing options...
MJRemi Posted October 7, 2011 Share Posted October 7, 2011 Is moisture somehow entering the fuel line or fuel rail connections? Link to comment Share on other sites More sharing options...
Fezzik Posted October 7, 2011 Share Posted October 7, 2011 hmm.... so, not knowing enough about coil on plug technology I had to read about it, and I think I found the answer, so I'll bow out for now Link to comment Share on other sites More sharing options...
JeepcoMJ Posted October 7, 2011 Share Posted October 7, 2011 It's a chevy. Now what do I win? Lol jk. Cracked o2 sensor getting a bit of moisture in it? Link to comment Share on other sites More sharing options...
Automan2164 Posted October 7, 2011 Author Share Posted October 7, 2011 hmm.... so, not knowing enough about coil on plug technology I had to read about it, and I think I found the answer, so I'll bow out for now Tune ups being as cheap as they are, I did just go ahead and toss spark plugs and wires at it. Still had the problem, but also found additional code, P0300 again, and a P0420 Lean Bank 1. Is moisture somehow entering the fuel line or fuel rail connections? Hooked up fuel pressure tester after seeing the lean code, was on the high side of spec, and good. Took a fuel sample off the rail to check for moisture. Now we are getting somewhere. We had an episode of bad fuel like this where it would separate out in the holding tank... Ended up siphoning out 6 tanks... Took a sample from the holding tank, it was good fuel... Now what? Rob :D Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 7, 2011 Share Posted October 7, 2011 my room mate's Audi had a random multiple misfire code, it was a cracked vacuum line Link to comment Share on other sites More sharing options...
Automan2164 Posted October 7, 2011 Author Share Posted October 7, 2011 After it settled out more: Getting to it... All lines were good up to the tank... What the... Filler neck actually rusted off the side of the utility body. With the 2 days of rain prior, it filled the tank to the top with water... Got to love the Mid-rust. The best part was what the driver left out for information... For awhile now, sometimes when he would fill up the tank, gas would shoot out under the service body. He "Thought I knew." :fs1: Rob :cheers: Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 7, 2011 Share Posted October 7, 2011 :nuts: :rotfl2: Link to comment Share on other sites More sharing options...
Fezzik Posted October 7, 2011 Share Posted October 7, 2011 holy carp, I guess my vacuum line leak thought was wrong....Oh and I'm the kinda worker you hate, because I show up for just about anything.. BUt how could he not say anything if gas was pouring on the ground while he tried to fill it!!! :dunce: :fool: Link to comment Share on other sites More sharing options...
Burls Posted October 7, 2011 Share Posted October 7, 2011 After it settled out more: Got to love the Mid-rust. :agree: Plus those service beds start rusting the minute paints sprayed on them. The Chevy dealer I bought my truck from regularly keeps new 3/4 ton trucks with service beds on them in stock and damn near all of them are already starting to rust. Link to comment Share on other sites More sharing options...
Automan2164 Posted October 7, 2011 Author Share Posted October 7, 2011 After it settled out more: Got to love the Mid-rust. :agree: Plus those service beds start rusting the minute paints sprayed on them. The Chevy dealer I bought my truck from regularly keeps new 3/4 ton trucks with service beds on them in stock and damn near all of them are already starting to rust. We have quite a few of them. This one is by far the worst. It's a Stahl, the doors are falling off, the handles rusted out, and it's only an '03. The Knaphiede's that we have aren't rusty as so much as ill prepped for paint. All the body color is flaking off and leaving the grey primer showing. By far my favorite body is the one on our 4500, and that's a solid steel Titan with the Autocrane. Rob Link to comment Share on other sites More sharing options...
dasbulliwagen Posted October 7, 2011 Share Posted October 7, 2011 With the filler neck being disconnected like that you should have gotten some eveap codes too, like Gross EVAP leak or large leak detected. That might have helped track down the problem sooner. When doing a visual check, thats always one of the places I look to make sure everything is hooked up right. Good job on figuring it out though! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now