Chug Chug CHUG

[turbo69]

Hey ladies and gents-

Been a while. Thought I'd pop in and say hey and see if you all can help me solve a little problem here.

My brother has a 90 model f350 dually with the 7.3 and E40D. The problem is a new noise that started about a month ago or so. When the truck is idling whether warm or cold, there is a loud chug chug chug chug chug noise that is constant from the exhaust pipe. I hear no extra noise from the intake, just the exhaust. Under the hood, with a stethescope (redneck translation: a pipe held to the ear ), I can hear an extra tick from the number two cylinder at the bottom of the head that I do not hear anywhere else. When I bust the nut loose at the top of the injector, the tick subsides, but the chug stays and the engine goes into the seven cylinder shake like it should. (Oh, I guess I should mention that there is a slight miss that coincides with the chug.) We went ahead and replaced the injector with a spare from the old Ghost with no improvement in either department. I am starting to think that the exhaust valve is sticking, bent, or something of that nature. What do yall think?

 

[BigDiesel]

Prolly exh valve guides. My truck had the same problem, I had the heads rebuilt, and new exh valve guides put in, and she runs great. My truck had a chuff out the exh with a rough idle.

 

[argve]

yep I would vote exhaust valve guide - they are pretty common to fail. I would be looking into getting it fixed because if left alone the valve will come apart and then you will be doing much more than just a valve job. When mine dropped many years ago I put a window in the block and heard internal engine parts hit the pavement and felt them as they bounced up and hit floor board as they were escaping my rule....

 

[turbo69]

Well, pulled the pass side valve cover and fired her up. Sure enough, we got exhaust coming out of the #2 exh valve guide. I can reach down and wiggle the valve and spring assy. Found a 7.3 complete and running for 200 bucks. Gonna pull the pass side head and replace this next weekend, cause the rest of the motor is strong. FUN, FUN, FUN!!!!

 

[icanfixall]

The number 2 cylinder is the front cylinder on the drivers side of the motor. Why are you pulling the passenger side head....

 

[turbo69]

my bad...thinkin small blk not diesel...

lets go with #3

 

[6.5dieselman]

great now y'all got me worried cuz i have something of a chug coming outta the exhaust.

 

[87crewdually]

Well, pulled the pass side valve cover and fired her up. Sure enough, we got exhaust coming out of the #2 exh valve guide. I can reach down and wiggle the valve and spring assy. Found a 7.3 complete and running for 200 bucks. Gonna pull the pass side head and replace this next weekend, cause the rest of the motor is strong. FUN, FUN, FUN!!!!

FYI: removing the HVAC box cover frees up tons of room so you can torque that head properly. Not sure if you can tell from this picture or not.

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It's only 6 screws, a nut up top, a bolt inside firewall near the floor, and a little metal clip, and of course the little vacuum line on the box.

 

[6.5dieselman]

i don't know whether i'm being paranoid or something is actually wrong. will somebody plz listen. this is right next to the exhaust after is warmed up

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[J D Recovery]

Don't hear any problems

 

[smolkin]

Sounds alot like mine, I attribute it to my fried injectors. Does yours make a tick/slap noise right above idle that evens out about 200 RPM later too? Because I'm hoping it's just my injectors, can't even think about valves right now.

 

[6.5dieselman]

yeah i noticed a slight tick right above idle. i'm gonna buy some new injectors and see if makes it any better. does anybody know of any injectors that i can buy that would add a little power but not break the bank like some bb's

 

[turbo69]

That is definately not a chug like we had. if you can imagine what an 18 wheeler sounds like letting off the air brakes into a pipe, but once every rev...thats what ours did.

 

[Agnem]

i don't know whether i'm being paranoid or something is actually wrong. will somebody plz listen. this is right next to the exhaust after is warmed up

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Sounds identical to mine. Also sounds a lot like the exhaust on the Orca in the movie "Jaws"

 

[6.5dieselman]

Sounds identical to mine. Also sounds a lot like the exhaust on the Orca in the movie "Jaws"

lol very true.
it also almost looks as scary as jaws