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Did head gaskets on 06 2.5i engine idles rough and shows…

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Did head gaskets on...

Did head gaskets on 06 2.5i engine idles rough and shows codes for misfire on all 4 cylinders

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Replaced gaskets because they started leaking from using wrong coolant. checked timing belt timing belt is good, replaced spark plug wires since one broke when taking heads off

Submitted: 2 years ago.Category: Subaru
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Answered in 18 minutes by:
3/1/2016
Subaru Mechanic: Mike V., Subaru Technician replied 2 years ago
Mike V.
Mike V., Subaru Technician
Category: Subaru
Satisfied Customers: 27,052
Experience: Certified Subaru Technician, factory trained by Subaru.
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Hi there,

When you say the timing belt is good, do you mean you didn't replace it or the timing marks are lined up?

were the heads machined?

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Customer reply replied 2 years ago
timing is still good replaced around 15,000mi ago timing marks are also good. didnt machine heads did compression test and all cylinders look good all between 150-175
Subaru Mechanic: Mike V., Subaru Technician replied 2 years ago

When the marks are lined up, where is the woodruff key pointing? Like 3 o'clock or 6 and so forth.

Is it possible for you to send a pic of your marks? With the compression it sounds like it should be good. That makes it seem like a coil issue or perhaps the plug wires are possibly crossed?

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Customer reply replied 2 years ago
woodruff key is at 6 o'clock, cam timing marks are at 12 o'clock.checked the wires thinking I did just that. car ran fine before is it likely the coil would go bad while sitting for 2 weeks car does have 140,000mi
Subaru Mechanic: Mike V., Subaru Technician replied 2 years ago

I wouldn't expect the coil to fail just sitting there to be honest, but it sounds like you are spot on with the timing marks to me. Compression is good.

The only other thing I think could or would cause this is if you missed a ground wire someplace. I see no other reason for the problem of misfiring on all 4, especially if you didn't do any adjustments and just swapped out the gaskets.

unless there is some issue with the new plug wires causing problems with the plugs..

I'm sorry, I may not be able to help from here and if you would like I can open this back up for the other experts.

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Customer reply replied 2 years ago
thank you. That's what I'm thinking if you could leave it open maybe someone else has run into this before
Subaru Mechanic: tamaz, Subaru master technician replied 2 years ago
tamaz
tamaz, Subaru master technician
Category: Subaru
Satisfied Customers: 1,361
Experience: Subaru certified,ASE Master technician,25 years experience
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Hi,I'll see if I can help,please check the bulk head harness connector located on passenger side for poor connections we find sometimes this harness gets pulled/stretched etc..while doing head gaskets .Sometimes while the car is running you can manipulate this harness and create or diminish the rough idle and misfires.Check it out and let me know ,thanks

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Customer reply replied 2 years ago
I actually tried that today I went around and wiggled/manipulated the harness at every sensor and at the main connection an didnt have any luck. clean MAF sensor since I run a K&N wanted to be sure oil didnt cause my problem. tested the coil and it tested with in spec 10.9k. did notice when wiggling that my throttle body is humming when I turn the ignition on and when I activate the pedal that the motor on the throttle body sounds a lil crunchy. another symptom I had failed to mention is that when I rev the engine and release the pedal the engine stalls as soon as the rpmsget below 1000. I did end up getting the engine to idle smooth with no misfire by unplugging the knock sensor.
Subaru Mechanic: tamaz, Subaru master technician replied 2 years ago

Remove and check egr valve ,the valve could be hanging up causing this problem ,once you the valve removed you can see if the valve is sticking by moving it with a screwdriver.

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Customer reply replied 2 years ago
I'll give it a shot this is my first vehicle with an egr
Subaru Mechanic: tamaz, Subaru master technician replied 2 years ago

Ok let me know,I'll be back tomorrow evening.

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Customer reply replied 2 years ago
checked the egr it functional cleaned carbon build up since I had it off. friend mentioned his wrx had the same problem when he got it serviced and the valves were adjusted. checked my valves they were at .0025 so i adjusted to .006 and the problem is solved . thanx for all the help
Subaru Mechanic: tamaz, Subaru master technician replied 2 years ago

That great news,glad it's fixed!

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