thewaiverproject Posted September 30, 2010 Share Posted September 30, 2010 Ok, my l28et 240z smokes when accelerating, especially in 1st and 2nd gear, at worst at low rpms. White Smoke. I did a compression test and got about 90 on cylinder 5. everything else was around 138. then a month later another test showed everything at 120, and cylinder 5 still 90. I thought the lost in compression might just be bc its a different day doing it, didn't matter too much since they were all close. Anyways, i figured it was a headgasket problem, especially since there was oil in the radiator. However when I took off the head, there were no signs of a broken headgasket. It looked fine, no cracks or breaks between holes. I already ordered a OEM headgasket from nissan, but the headgasket on the car seems like a custom one, that's better fitted and has more length on the edges. should i replace it anyways? or just return the part or sell it. What can be the problem now? piston rings? but that seems weird that 1 ring will be soo off, i thought they wear out pretty similarly. I am about the check the valve guides, but i thought they are damaged only when theres blue smoke. I'm not sure how to tell if the piston/rings/cylinder is bad. Since the block is still in the car, do i have to get the pistons out ( via taking off the oil pan and using a hammer to push the pistons up) to really get a good idea? thanks Quote Link to comment Share on other sites More sharing options...
Daphur280 Posted September 30, 2010 Share Posted September 30, 2010 I have same problem, but mine is blowing blue smoke. Is it a p90 head or a p90a? Quote Link to comment Share on other sites More sharing options...
roger.svoboda Posted September 30, 2010 Share Posted September 30, 2010 white smoke oil in radiator. don't care what that gasket looks like. something is wrong. never torqued down. head warped. you need to do some more checking. Quote Link to comment Share on other sites More sharing options...
greghassen Posted October 2, 2010 Share Posted October 2, 2010 i'de have the head pressure tested. I had the exact same thing, oil in the radiator, white smoke and head gasket looked good. Took it to a machine shop and he told me it was a casting flaw. It was letting oil flow down into a coolant jacket. He had to grind out alot of material before he hit good aluminum. Then welded it up. Been fine ever since. Quote Link to comment Share on other sites More sharing options...
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