Oh Crap

[dtruslow]

Newbie here. Hell of a way to start off but I have a burnt valve on #4 new cilinderhead required probably. Weighing my options. Fix problem at the cost of about 2500 dollars or maybe put a small Cummins diesel in her.? Thoughts?

 

[mjferencak]

$10,000+ for the cummins swap. What engine are you running now? Valve jobs are cheap.

 

[Happy Hummer]

Welcome,

Yay let's start at the beginning and pretend we know nothing about anything (which of course at this juncture we don't)!
What year, engine and codes & symptoms?
Chris

 

[GreatDaneHummer]

If you are thinking of doing a Cummins swap reach out to Casey before and after you see the amazing amount of work he put into his it might make you change your mind like me and just go for an LS3 swap.

 

[JPaul]

Or get a used head and replace it yourself and save $2000. Any kind of swap is going to cost you a lot more than replacing a head (thousands and thousands more, not like a few hundred more unless you picked up a wrecked Alpha for cheap) and is going to have you down for a lot more time too.

Replacing a head isn't really that hard, it's just a bit of work. The most challenging aspect will be getting the timing set correctly, but usually all you have to do is line up arrows/marks and do it in the right order. The FSM on Schwartzy's site has the procedures I believe. You can probably do it in a day, two tops.

 

[rascole]

I love threads that start with Oh Crap!

 

[3Hummers]

Well they do grab your attention

 

[dtruslow]

I also thought OH Crap my get some attention. I have a 2008 H3 with the 3.7 in her. I had just replaced the plugs and cleaned the throttle body. I was told by the dealership that they discovered a burnt valve in the #4 cylinder. Although, to be honest, I am very scheptical simply because the vehicle idles and runs just fine....no backfiring or missing etc.. what to do?
Dealership just looking for more work? Not sure, just trying to process.
Thanks for everyone's feed back.

 

[4speedfunk]

I'm curious how they "discovered" a burnt valve in #4. These motors are prone to all kinds of shudders and shakes. Coil packs, vacuum leaks, loose intake bolts, coked-up throttles, blah blah blah.

If you have a 3.5/3.7...and it starts & runs...drive it! Don't go looking for trouble. If there is truly trouble it will tell you with an engine code, or it simply won't start & run. Its the Gary Busey of motors.

 

[RamRod]

Do what 4speeds suggests and if you take that advice, buy a towing membership so it doesn't sting so bad when it does break down

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[Jack_M]

Thanks!! I read the Gary Busey of motors comment and spewed pop all over my laptop!!!

 

[4speedfunk]

Yeah...he's totally likable but, there's something not quite right about him.
[emoji12]


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[chaos254]

I'm also curious how they came up with the burnt valve theory? Is the head already off?

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[dtruslow]

Said they found it when replacing the plugs. Bore scope maybe? Not a mechanic so not sure. Just drive it!! Sounds reasonable. Thanks everyone.

 

[Panzer07]

Do what 4speeds suggests and if you take that advice, buy a towing membership so it doesn't sting so bad when it does break down

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Yupe...1 more month before I can upstage my aaa membership...it sure sucked finding out the damn insurance agent didnt activated roadside asistance for my motorcycle. A 15 mile tow came up to $380. Needless to say I made sure to have all roadside assistance for the car and motorcycle thru the i stance company as well aaa.

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