my 06 has a cough,hiccup at idle every so often only has 22k miles on completely ne fuel system. been down the bad injector road so i know what to look for there and its not them. truck is stock except for BD outlook monitor. fuel filter is changed every 12k

 

any ideas anyone

 

funny i post a needed question and nobody answers but have somebody ask how to open their door and 50 people respond

 

Rich

If it helps, I have the same thing going on with an 05 3500.

I haven't looked into it yet, as it doesn't affect performance. However

On an 07 kenworth, it used to do the same thing at idle. with the ISX engine. No performance issues, so no big deal. Eventually, it progressed to when it was running down the road. Then one day, it coughed, and threw a check engine light.

Pulled the code, and it was power loss to the ecm while key in "run" position.

Well, for the next several trips, I hunted all over the place. Ended up being a loose connection, on one of the main circuit breakers, INSIDE THE BATTERY BOX!!!

That was a bit of a brain bender, and no doubt in my mind, I will find something of the same on this 05 when I get a chance.

Good luck

 

thanks for a reply, like i said it only does it at idle

 

My 07 does too.It happens when I'm in line at drive-thru every once in a while.

 

In your case, it is telling you that drive-through food is CRAP... *coughchokehack* and that you should avoid it at all costs.

 

so is it in the ecm or fuel system i got about 9k till i'm out of warranty

 

Its happened to my '07 2-3 times. A hiccup is a good description. Idles along and then it hiccups and goes right back to idling along.

The only time its done it is when the truck is cold and the grid heaters kick on after starting.

I think the big draw the grid heaters pull has something to do with it.

 

that's what it seems like.voltage gauge drops when it does it like when grid heater comes on.It might just be that wendys chicken sandwich.

 

my 07 will do it sometimes when the grid heater shuts off. it will hiccup and then return to normal idle......couldnt tell ya why.

BTW, open the door by pulling the handle.......hope that helps

 

its above 40 when it does it so its not grid heaters,

 

This usually happens when grid heater cycles. Next time it does it look at your volt meter. If it is drawn down then that is the case. The heater draws a lot of power. Mine will cycle off and on til operating temp is reached even if it is above 40.

 

well it was over 80 the other day when it did it and it does it way to fast to be the heater cylce i can tell the difference when the heater goes on

 

Mine does it every once in a while. And it happens with the engine at running temp, so it's not the heater grid. Been doing it since the truck was new so I'll say it's one of those little quirks.

MikeyB