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EJ18 knocking when cold/cold weather
Posted 01 November 2010 - 08:04 AM
Posted 01 November 2010 - 08:24 AM
Ok folks -- I've got an EJ18 motor with 107k, it seems to knock like a mo-fo under heavy load when it's cold outside (<40F) and before the car is warmed up. If it's warm outside, or after it's warmed up, it goes away. Any ideas?
assuming it has enough oil...
it sounds like piston slap, but i've never heard of it in an ej18 and only maybe in an ej22. usually it's an ej25 issue.
or maybe a loose t-belt.
Posted 01 November 2010 - 10:49 AM
sometimes timing belt tensioners fail and make a knocking sound too, which can easily be mistaken for an engine issue. but - that's usually with the new style tensioners, i've enver seen the old style tensioners fail which is probably what yours has. not sure if they can knock too but i'd imagine they can. remove the drivers side timing belt cover (very easy, just 3 10mm bolts) and watch in there when it's making the noise, you can see the tensioner pulley moving and giving some. or listen to the timing belt covers with a mechanics stethoscope.
if it's ever been run low on oil then an actual engine knock could be the cause in which case the engine is hosed. you'll need another block. the good thing is EJ18's aren't worth anything because demand it low and they very rarely fail. easy to pick a known good one up cheap. i bought one with 80,000 miles and 60 day warranty for $150, runs great. i used it for a swap, not to replace a bad engine though.
Posted 01 November 2010 - 11:03 AM
The ej18 does have HLA's. Any chance it's that?
Edited by kc8apm, 01 November 2010 - 11:05 AM.
Posted 01 November 2010 - 11:18 AM
Posted 01 November 2010 - 12:42 PM
if it's HLA's that should be obvious as it would likely come from one side and not the other...unless multiple ones are fouling.
maybe it's the oil pump? has it ever been resealed? the rear backing plate screws notoriously come loose on all EJ engines (same pump). i don't know that i've pulled one that didn't have at least one screw loose. not sure what the symptoms would be if they were all loose but i'd imagine something would happen - maybe that's what's happening?
if you want to keep the car a long time maybe you could plan on a complete timing kit replacmenet ($80 on ebay) and resael the oil pump while you're in there. 60,000 trouble free miles after that until the next tbelt change.
Posted 01 November 2010 - 01:00 PM
Posted 01 November 2010 - 01:01 PM
Posted 01 November 2010 - 03:00 PM
piston slap should be gone by the time the car reaches operating temperatures. thing is, some are bad enough that it only gets quieter once car is warmed up and doesn't completely go away - just depends, not always the same. if it decrease directly with temperature it seems like it's a good candidate for piston slap, but hard to say since you sound confident it's not it's good to explore other possibilities too.
Well, if it is piston slap, how long should I expect it to last, I mean as the car warms up?
if this thing does have HLA's....which i think it does...then frequent oil changes are huge. we deal with this all the time in the older gen stuff. sea foam, MMO, and even ATF are added to free what may be sticking HLA's. in those cases usually the sound is noticably from one side or area...wherever the problematic HLA is.
or it can be oil supply related, meaning the oil pump needs resealed. in those cases usually it's all over the place because it's affecting all of them.
does your sound like it's from one side or both....or centrally located? that might help a good bit to determine that.
Posted 08 December 2010 - 09:43 PM
Posted 08 December 2010 - 11:39 PM
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