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Yesterday I was driving down the highway around 65-70mph to meet the car club for breakfast and a trip into the mountains to visit a castle. I was 28 miles into the drive and only saw boost twice in that time. I barely depressed the accelerator pedal to switch lanes when I was met with a large cloud of smoke and an immediate check engine light. I pulled to the side of the highway and cut the engine off. Got out of the car and checked the oil dipstick - it was definitely low but was above the add oil mark and was normal oil color (no milky white). Opened the oil fill cap and smoke came out. There were no leaks of anything, anywhere. Started the car and it ran rough with no smoking while at an idle, any amount of gas given and white smoke was coming out the rear end, I cut it off. I assumed I had a blown head gasket got a tow back to my house.

The car:
07 GXP with 37k miles, Trifecta tune, DDM charge tubes and CAI, Solo high flow cat, PAW intake and TB spacer.


Bought a compression checker from Harbor Freight and found:
Cylinder 1 - 85 psi
Cylinder 2 - 0 psi
Cylinder 3 - 85 psi
Cylinder 4 - 100 psi

I'm going to go rent a different compression gauge from AutoZone in about 45 min to see if mines faulty.

1 engine code - P0302 - Bad number 2 cylinder

Question - could a blown head gasket really affect all 4 cylinders?

The cars not been driven hard in it's life - does this even make sense?

Could I of overheated the block due to low oil (are there low oil CEL lights, bc I never had one; also the cars never leaked oil in it's life) and therefore warped the head (water level is still perfect)?
 

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Update - O'Reillys compression gauge shows the same values as the Harbor Freight.

Could a simple Trifecta tune really blow the head gasket? It's been driven less than 1500 miles since the tune was performed.

I just don't get it - and all 4 cylinders to boot!?!
 

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Here's my take on tunes. How many miles do you have on your car? I had mine dyno tuned when I had 35k on it...so it was fairly "new". Honestly, the cars are all getting to an age now where if you didn't have a tune before, putting one in now is going to almost certainly create issues, up to and including a head gasket. Had my car had 60+k on it, I would have NEVER had it tuned. Bad things happen to weak/worn parts when you introduce new stress levels.

How many pounds of boost was your tune set for? Anything over 20psi is a bit much for these engines if all stock. I would say if there was no white smoke out the back you might have a fuel issue, but with white smoke, it sound terminal....

If it's any consulation, you did the right thing by immediately shutting it off. Hopefully you can put a new head gasket on it and your good. If you are going that route, the sooner you the coolant out of the turbo, the less damage there will be to the bearings and you might just get away without having to put a turbo on it too....
 

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It's probably a head gasket. Hope for the best.

The tune likely had no impact. It also could be a valve. You just had the intake off.

I would pull the head and have a look.

At least you did not puke out three quarts of oil...again like I did lol
 

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I'd blame bad luck but not the Trifecta tune. I'm at 198K miles and have had my tune for quite a while. There is a warning light if you overheat. If you didn't see it (I have) there's a good chance its "just" your head gasket.
 

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Some LNF engine block were porous
That is true but small in number and I thought they failed catastrophically and the issue was pretty obviously a hole in the block?
 

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Discussion Starter #8
Thank you everyone for your time and responses!

A question - could the head gasket issue truly be the cause of ALL 4 cylinders to be low in compression?

Good question Rob - I'm curious of that too?
 

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Typically when the head gasket fails it is localized to the adjacent cylinder(s) but you won't know till you pull the head and take a look

Good news is cleaning the intake is a lot easier. :)
 

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I don't see it being a head gasket issue. It would take multiple failures to effect all cylinders. I'm thinking something caused the cam timing chain to jump a couple of teeth on one of the cams and slightly bend some valves. I don't know what else would cause low compression on all cylinders. Let us know.

Larry
 

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I meant to post this yesterday....a bit of humor.

You're title reminds me of the Walrus and penguin joke....If you don't know it, post here and I'll PM it too you.
 

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**Edit**
@Z06-GXP's suggestion about the timing chain makes a LOT of sense - much more so than a head gasket. You might start by pulling the timing chain cover and seeing how far off it is (assuming that's the issue). It's *possible* that the chain can jump without actually bringing the valves into contact with the pistons if it didn't skip too many teeth.

If your gasket goes and the engine overheats - which will happen very quickly - the resulting warpage in the head could very easily affect multiple cylinders. The pattern you mentioned indicates that there's a serious breach near cylinder #2. If it's bad enough to actually get ZERO compression, it would have to be a very large break.

Normally, for zero compression, I would suspect a valve (or even a loose spark plug). But, you'd have to have at least four bad valves on different cylinders in this case. And, a stuck valve wouldn't give you 85 or 100 psi. I'd bet a beer that it's the head gasket.

While you're in there, may as well do some ARP head studs. :)

Regarding tunes on a high mileage engine: I've been running RPM's stage 2 on my 105k mile LNF for awhile now with no issues. 165psi across the board.

Since it's easy, you may as well go ahead and do the oil test. Add a teaspoon or so of oil to each cylinder via the spark plug hole before running the compression test. Also, on the off chance this isn't obvious, compression numbers will be way off if the test is performed on a cold engine, and the gas pedal has to be on the floor when performing the test in order to keep the throttle open. Don't worry about fuel as the ECM recognizes this as a command to open the throttle while not injecting any fuel.

The oil in the cylinder will also give you more accurate numbers when testing a cold engine.
 

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Look's like John and the Ghost were both right. Even though the link did make me chuckle, now that I've heard the joke I'm glad that raygun got us back on topic and for the record, it doesn't sound like a head gasket to me either.
 

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Ever watch the solstice girl vids maybe you got this. I've blown my share of motors over the years. If the piston was on the rod always had at least some compression. Holes in piston,rings scraped over never seen one at zero not that it cant happen. Dosnt sound good what ever it is.

 

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Has anyone suggested doing a leak-down test? If so, I missed it. In most cases it will tell you exactly where the problem is.
 

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Has anyone suggested doing a leak-down test? If so, I missed it. In most cases it will tell you exactly where the problem is.
If you're getting zero compression on a cylinder, I'm not sure a leak-down test is going to help.

Given the compression pattern - 85,0,85,100 - I'm wondering how that compares to the cam profile. I like (ugh) the idea of a slipped chain.
 

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If you're getting zero compression on a cylinder, I'm not sure a leak-down test is going to help.....
What I have found to be the biggest help from a leak-down test is finding out where the leak actually is.

Since you are blowing a controlled amount of air into the cylinder you can hear where it is escaping.
 
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