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Engine light on-Bent Valve???

 
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Old 01 Jun 2017, 12:48 pm
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Default Engine light on-Bent Valve???

2005 Turbo-Engine light comes on and goes off after several days.
Slightly rough idle- engine light flashes occasionally at that point I turn off immediately, wait a few and restart with solid engine light on. Code identified as cylinder 1 misfire. Changed wire and plug.

Shop installed and miss-diagnosed Crankshaft sensor...re diagnosed with bent valve with 3100.00 repair.

Anyone have any ideas of what it might be besides their diagnosis?
Help???

Thanks,
Paul
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Old 01 Jun 2017, 12:59 pm
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Default Re: Engine light on-Bent Valve???

What did the repair order say? What did they do to diagnose the bent valve?
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Old 01 Jun 2017, 01:22 pm
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Default Re: Engine light on-Bent Valve???

I've had cylinder misfires before and here is what I learned to check:

a) A leak around the intake manifolds.

b) That the plug is getting a consistent spark from the coil, and if not, I would check that the coil is getting the proper feed from the computer.

c) The fuel injectors, especially at cylinder 1 obviously.
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Old 01 Jun 2017, 02:58 pm
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Default Re: Engine light on-Bent Valve???

I would suggest Techron fuel injector if everything else checks out good. Sometimes the injectors get dirty and can trigger codes. What brand gas do you put in it?
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Old 01 Jun 2017, 03:07 pm
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Default Re: Engine light on-Bent Valve???

Do a compression check. If you have compression you can rule out burnt valve. The other advices given above for spark and fuel will help narrow down what else it might be.
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Old 01 Jun 2017, 03:14 pm
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Default Re: Engine light on-Bent Valve???

Quote:
Originally Posted by Busted_PT View Post
Do a compression check. If you have compression you can rule out burnt valve. The other advices given above for spark and fuel will help narrow down what else it might be.
Isn't that what the shop should have done to come up with their conclusion?

Of course, we haven't heard yet from the OP on exactly what the shop did to come up with their diagnosis.
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Old 01 Jun 2017, 05:41 pm
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Default Re: Engine light on-Bent Valve???

As others have said, first thing is to find out how/why the shop diagnosed the bent valve.

To do it at home:

Compression test? This would be lower on my list, but as Busted points out, it would probably rule out/in the valve diagnosis.

I would swap plug wire 1 and plug wire 4. Reset the codes. When they pop back on is it 301 or 304?

Swap injectors from one cylinder to another. Did the code follow the injector?

Does the car have the aluminum intake? I think most '05's had composite, but the aluminum are notorious for blowing out around #4. Mine sure did, but #1 and the composite manifold are still possible.

FWIW, IMO, the flashing light is usually the car running pig rich and telling you to shut down before the catalytic converter is damaged. Not sure how that helps diagnosis, but take it for what it's worth.
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Old 01 Jun 2017, 07:49 pm
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Default Re: Engine light on-Bent Valve???

actually guys you do a leak down test to verify if the issue is head or short block related.
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Old 03 Jun 2017, 01:15 pm
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Default Re: Engine light on-Bent Valve???

Sorry for the delay in answering... Don't know how to reply to question regarding my post. Maybe this is correct?

Shop said they did a leak test.
I always use 87 Octane. should I be using higher octane with a turbo?

I will try Seafoam.

Thank you,
Paul
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Old 03 Jun 2017, 02:46 pm
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Default Re: Engine light on-Bent Valve???

Quote:
Originally Posted by paulwells77 View Post
2005 Turbo-Engine light comes on and goes off after several days.
Slightly rough idle- engine light flashes occasionally at that point I turn off immediately, wait a few and restart with solid engine light on. Code identified as cylinder 1 misfire. Changed wire and plug.

Shop installed and miss-diagnosed Crankshaft sensor...re diagnosed with bent valve with 3100.00 repair.

Anyone have any ideas of what it might be besides their diagnosis?
Help???

Thanks,
Paul
Okay, let's see what we know.

* 2005 Turbo Lite.
* Check engine light comes on intermittently.
* The code throwing the light is P0301 Cylinder #1 misfire.
* Plugs and wires were changed. No joy.
* Shop changed crankshaft sensor. No joy.
* Shop now says bent valve and wants $3,100 to fix it.

To diagnose a bent valve, a shop will often perform a dry compression test. If a cylinder appears to have low compression, the shop will then perform a wet compression test. The wet test involves squirting oil on top of the cylinder to help worn compression rings seal better. If the wet test shows about the same results as the dry test, then the low compression is often due to a leaking valve because adding the oil does nothing to help the valve seal better, it only helps the rings.

If this test (or some other similar definitive test) was not performed, your shop likely doesn't not know what they are doing and just wants your money. At that point, I'd run from this shop and never look back. Also, I've believe nothing they told me up to this point.

You can try to run your own compression tests as others described or you can find another more-reputable shop if you can. Just know that valve damage in these cars is very rare unless first caused by some other catastrophic event. An injector or plug/wire problem is going to be much more likely unless the compression tests show differently.

PS: Has the car ever overheated? And does it ever lose antifreeze? A very minor head gasket leak (due to earlier overheating) can sometimes show very similar symptoms to what you describe.
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