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Any Ideas on 5.9l miss at idle

4947 Views 4 Replies 3 Participants Last post by  triton
Hi, new here to the forum but have an issue with my 06 5.9l, about 6 months ago noticed a miss at idle starting, brought to the dealer and they diagnose a bad injector #6 I think, didn't fix it, I will make a long story short, they then re-built the engine, still missing, replaced a few more injectors, no fix, checked all sensors, wiring, tried a new ecm, took engine apart again and found nothing wrong, they now tell me they would like to try a dual mass flywheel which I know can cause what feels like a miss at idle but the wierd thing is while doing cylinder contribution tests some cylinders drop to around 89% when the miss is there, back out of the test and it quits missing, bump the accelerator pedal and miss stops, always runs great when driving........????????
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Wow, hope this wasnt all on your dime...update sig so everyone knows what you have to include mods and mileage on your rig.
 

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Is it a intermittent miss ?

It could be several things but, would consist of getting into the motor to find out.

My truck had a intermittent miss at idle but, ran fine driving down the road. It got worse so I pulled the head to see what could be going on. I found a bent exhaust valve that wasn't closing all the way..... the cause of my miss.

Not likely you have a bent valve being a stock truck and the fact it's been rebuild but, It's possible you could have a dropping or loose valve seat in the head. It's a common thing and if the valve isn't closing like it should, you'd have a miss. You'd also be able to hear a pinging or knocking though.
 
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