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Guest Message by DevFuse
 

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Replaced timing belt after it jumped a tooth. Cylinders 1&3 were 90 and 80 psi respectively, now 210 and 60 respectively.

legacy EJ25 EJ25D DOHC 2.5L 1999

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#1 kevinrse

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Posted 21 May 2014 - 11:41 AM

Legacy EJ25D 2.5L DOHC.

 

Engine began running rough and idling rough a few weeks back, CEL diagnostic codes said cylinder 1 & 3 misfire. Diagnosed with a compression test. Cylinders 1 and 3 were getting 90 and 80 psi respectively. Cylinders 2 and 4 were 190 and 180 respectively.

 

I just put the timing belt back on and re-checked compression on the right side. Cylinder 1 is now getting 210 psi, but Cylinder 3 is only getting 60. (Note---I did this before the engine was all back together, so I didn't idle it beforehand and the compression test was run on a cold engine.)

 

I'm pretty sure I got back the power I was lacking when the timing belt slipped. Just took it for a spin and it feels about the same as I recall it in terms of acceleration. So, it's possible that cylinder has been underperforming for some time...

 

Now that I have the results of a compression test and verified timing is like new again, is there anything further I can do without getting into expensive territory (valve work... piston rings etc.)? This is an old car (228k miles).



#2 1 Lucky Texan

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Posted 21 May 2014 - 12:49 PM

doubtful - if you were extremely lucky, some marvel mystery oil might free-up a sticking valve. more likely it is; sticking, dropped guide, bent or burned. much less likely would be a cracked piston ring i guess?

there are borescopes made for looking around in there thru the plug hole, but i dunno if one can be rented or not ????

if you get a used ej25 , you'll probably need to put MLS head gaskets on it.

Edited by 1 Lucky Texan, 21 May 2014 - 12:50 PM.


#3 kevinrse

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Posted 21 May 2014 - 12:55 PM

Thank you. What will happen if I keep driving with any of these problems? I.e., can I drive on 3 cylinders for the life of the car with no other consequences, or will it eventually cause bigger problems? I have a friend with a borescope so I will try to borrow it sometime soon.



#4 1 Lucky Texan

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Posted 21 May 2014 - 01:13 PM

depends on what's wrong but, generally, just variably bad stuff - nothing good.



could be; more stress on the cat converter, engine might get more load=runs hotter, if a ring is cracked, oil gets diluted with fuel, valve seat may erode.....


dropping the exhaust might allow inspecting for a dropped valve guide.


Edited by 1 Lucky Texan, 21 May 2014 - 01:16 PM.


#5 kevinrse

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Posted 22 May 2014 - 09:57 PM

Per a friend's advice I just performed a leakdown test. I give this info in a new thread. If you are interested check it out here.

 

Thanks again for the help y'all!







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