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Old 04-09-2013, 10:15 PM   #1
PineyLGT805
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Join Date: Dec 2007
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Location: SLOcal
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2005 LGT Limited
Regal Blue

Default Cylinder 3 Misfire ... 2005 LGT

Had a CEL with a cylinder 3 misfire. Dealership has swapped plugs, coil packs, n now has told me they need to tear the motor down to find what's causing the misfire. They said they did a leak test n that cylinder 3 is leaking 10%

I'm now trying to figure out what to do. I really don't wanna pay for them to tear down the motor but I'm up against a rock n a hard place. I need the car smogged to either drive it with a leaky valve or sell it but can't get it to pass smog with the misfire.

Long story Longer, I need advice from fellow members on what to do next. I can get more detailed info on what he tech did to my car tomorrow if u guys need ne more info... Thanks again
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Old 04-10-2013, 12:40 AM   #2
SkateAndDestroy
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Have them swap the injector to another cylinder and see if the misfire follows...try that first. If they did a leakdown test, did they do a compression test too? I see lots of burnt exhaust valves which would show up in the compression test...10% leakdown isn't that bad, especially for an older mileage car.
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Old 04-10-2013, 12:57 AM   #3
PineyLGT805
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They swapped injectors as well... Misfire stayed on cylinder 3. Only info i got on the phone was that they did "everything they could" without tearing the motor down and a leakdown test revealed a 10% leak from cylinder 3. Im sure they did a compression test but i didn't get the results over the phone. I will find that out tomorrow.

I have trolled around searching for Cylinder 3 misfire threads and am pretty familiar with the common cures. I haven't seen any however where they could solve my problem without spending thousands of $$$$$...

My purpose for this thread is to figure out what to do if I need to tear the motor down. Fix and be in a heap of debt, fix and sell or just deal with. Confused and would like expert subie owner advice on what they might end up doing if they were in my shoes.
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Old 04-10-2013, 08:51 AM   #4
dschnaq
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Quote:
Originally Posted by PineyLGT805 View Post
They swapped injectors as well... Misfire stayed on cylinder 3. Only info i got on the phone was that they did "everything they could" without tearing the motor down and a leakdown test revealed a 10% leak from cylinder 3. Im sure they did a compression test but i didn't get the results over the phone. I will find that out tomorrow.

I have trolled around searching for Cylinder 3 misfire threads and am pretty familiar with the common cures. I haven't seen any however where they could solve my problem without spending thousands of $$$$$...

My purpose for this thread is to figure out what to do if I need to tear the motor down. Fix and be in a heap of debt, fix and sell or just deal with. Confused and would like expert subie owner advice on what they might end up doing if they were in my shoes.
Good luck, I just blew the turbo on my 05 LGT. I was driving home and the check engine light came on. Car started acting funny, I had it towed to the shop. I was all ready to put a VF52 and supporting mods on. Then they did a leak down test and cylinder two was the culprit for me. I could of gone the rout of a new shortblock for about 1800$. With the turbo and installation it was going to be around 7K. I decided I didn't want to put the money into that car. So I went and got a 2013 Sti.
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Old 04-10-2013, 11:13 AM   #5
mccanixx
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Quote:
Originally Posted by PineyLGT805 View Post
My purpose for this thread is to figure out what to do if I need to tear the motor down. Fix and be in a heap of debt, fix and sell or just deal with. Confused and would like expert subie owner advice on what they might end up doing if they were in my shoes.
If even remotely handy I would buy a harbor freight leakdown kit ($40) and do it yourself.

It can help further pinpoint if it's just intake/exhaust valves, rings, or all 3. Then you can make a more educated decision on how to proceed. Maybe it's just valves. Refreshed head is 175-200 a piece if you take them to the shop. For that money I'd bet you'd keep it, even if you did both of them.

The shop should have told you or should be able to tell you if it was intake/exhaust/crankcase or whatever was leaking down.

Would also be interested in the compression test as it would give you a broad view of the health of the engine.

Good luck

Just had a similar issue with a #1 mis-fire. The intake valves were both leaking. Time consuming but over all inexpensive fix.
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