add heywood Posted April 27, 2010 Share Posted April 27, 2010 Been reading some old posts but I cant understand why this is not happening all the time... Coming home from Oulton Park at the weekend had a little play with a S14, recorded the pulls for about 3 mins with the Defi's and everything was fine, all temps were normal etc. About 2 mins after the warning light/sound starts as the water temp is hitting about 110c. Checked the Power FC commander and that was reading 100 ish. Pulled over to find the overflow pipe on the expansion bottle had pissed coolant down the front of the car. Got home (without the temps going any higher) and it took about a litre of cooland to fill the rad back up. Now the car had run 200 miles or so normal driving and the water level was fine (checked before I set off to Oulton Park that morning). It happened a while ago when the car was being dyno'd at SRR aswell. Drove the 200+ miles and checked all fluid levels before mapping. All was fine until about the 5th pull when I saw water pissing down the front bumper. Ive changed the radiator cap for a brand new TRD 1.3 bar cap... Any suggestions? Quote Link to comment Share on other sites More sharing options...
jevansio Posted April 27, 2010 Share Posted April 27, 2010 Head gasket has blown between cylinder & water jacket? Cylinder pressures are blowing coolant out the system. Quote Link to comment Share on other sites More sharing options...
add heywood Posted April 27, 2010 Author Share Posted April 27, 2010 would this show the tell tale signs through the oil? (ie white gunk around oil etc) Did an oil and water change and the old oil was clean and water came out red. Also had the cam covers off not long ago and oil was fresh in there also... Quote Link to comment Share on other sites More sharing options...
jevansio Posted April 27, 2010 Share Posted April 27, 2010 Not necessarily, if the HG is not blowing between the water & oil then there will be no trace. Not saying it's defo that, but from what you describe its a possibility. Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted April 27, 2010 Share Posted April 27, 2010 Check your rad cap, if the springs knackered, it'll overflow coolant into your expansion tank. Quote Link to comment Share on other sites More sharing options...
nigelboyne Posted April 27, 2010 Share Posted April 27, 2010 could be air in the system Quote Link to comment Share on other sites More sharing options...
absz Posted April 27, 2010 Share Posted April 27, 2010 Still seems like a rad cap fault to be honest Quote Link to comment Share on other sites More sharing options...
Dnk Posted April 27, 2010 Share Posted April 27, 2010 Head gasket has blown between cylinder & water jacket? Cylinder pressures are blowing coolant out the system. Surely if this were the case the water would be blown out all the time. Put a stock rad cap on it for starters is where i'd start Quote Link to comment Share on other sites More sharing options...
jevansio Posted April 28, 2010 Share Posted April 28, 2010 Surely if this were the case the water would be blown out all the time. Put a stock rad cap on it for starters is where i'd start Nope, mine wasn't on the Supra (and on my old MR2 IIRC). Was blown out under high boost heavy load situations only. If the car was left stood coolant would "seep" back into the cylinder slowly so next time I started I would get A LOT of steam out the exhaust. Was fine under normal light driving conditions Also I only suggested this as he said in OP he had just swapped cap for new TRD unit Quote Link to comment Share on other sites More sharing options...
sams Posted April 28, 2010 Share Posted April 28, 2010 Easy way to tell if the hg has gone is fill the expansion bottle to the max line or abit higher and look in the expansion cap, open the throttle up by hand till it near the limiter, and let it go and watch to see if bubbles come through the water, if so it hg gone or going, Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted April 28, 2010 Share Posted April 28, 2010 Nope, mine wasn't on the Supra (and on my old MR2 IIRC). Was blown out under high boost heavy load situations only. If the car was left stood coolant would "seep" back into the cylinder slowly so next time I started I would get A LOT of steam out the exhaust. Was fine under normal light driving conditions Also I only suggested this as he said in OP he had just swapped cap for new TRD unit If you had seepage into the bore causing steam on startup, you must have had mayonaise in the oil too? Quote Link to comment Share on other sites More sharing options...
jevansio Posted April 28, 2010 Share Posted April 28, 2010 If you had seepage into the bore causing steam on startup, you must have had mayonaise in the oil too? Oil cap was fine, that was the only place I checked Quote Link to comment Share on other sites More sharing options...
Dnk Posted April 28, 2010 Share Posted April 28, 2010 If its blown across into the water gallery then just get a sniff test done which is very easy to do and shows exhaust gas in the water even if its only a small amount. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted April 28, 2010 Share Posted April 28, 2010 Rule out the HG, get a sniff test done and check for hydrocarbons in the coolant. Easy stuff first *Edit* Great minds etc Quote Link to comment Share on other sites More sharing options...
Dnk Posted April 28, 2010 Share Posted April 28, 2010 Rule out the HG, get a sniff test done and check for hydrocarbons in the coolant. Easy stuff first *Edit* Great minds etc I agree totally Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted April 28, 2010 Share Posted April 28, 2010 Get a sniff test done. Edit : Oh, yeah, what they said Quote Link to comment Share on other sites More sharing options...
add heywood Posted April 28, 2010 Author Share Posted April 28, 2010 i was just about to say ill get a sniff test done lol Car was stood for around 3 months over winter and when started there wasnt an adverse amount of steam from the exhaust, just the usual amount i was expecting... If the test comes back negative ill flush the coolant system and put new in, try to see if there is any airlock i suppose. Rad cap shouldnt be the problem as said there is a brand new trd cap on there. Quote Link to comment Share on other sites More sharing options...
Nodalmighty Posted April 28, 2010 Share Posted April 28, 2010 Similar symptoms can be the result of a cracked block/liner. Lyndon. Quote Link to comment Share on other sites More sharing options...
add heywood Posted May 4, 2010 Author Share Posted May 4, 2010 Easy way to tell if the hg has gone is fill the expansion bottle to the max line or abit higher and look in the expansion cap, open the throttle up by hand till it near the limiter, and let it go and watch to see if bubbles come through the water, if so it hg gone or going, did this today and saw a few small bubbles everytime I let off the throttle.... car booked for sniff test tomorrow... Quote Link to comment Share on other sites More sharing options...
jevansio Posted May 29, 2010 Share Posted May 29, 2010 Did you get this sorted Add? Quote Link to comment Share on other sites More sharing options...
hodge Posted May 29, 2010 Share Posted May 29, 2010 Sounds like Air lock to me. Bossco had the same issues when his car came back from motorscope as second turbie came in. Water temp would go upto 120 degrees. Took me ages to find to narrow it down to an air lock. I did a sniff test, Changed thermostat and water pump with no difference. Eventually put a massive alloy rad in and spend 3hrs bleeding it off and hey presto. Quote Link to comment Share on other sites More sharing options...
imi Posted May 29, 2010 Share Posted May 29, 2010 Sounds like Air lock to me. Bossco had the same issues when his car came back from motorscope as second turbie came in. Water temp would go upto 120 degrees. Took me ages to find to narrow it down to an air lock. I did a sniff test, Changed thermostat and water pump with no difference. Eventually put a massive alloy rad in and spend 3hrs bleeding it off and hey presto. Sounds like a plausible cause Quote Link to comment Share on other sites More sharing options...
d_d Posted May 29, 2010 Share Posted May 29, 2010 i agree with an air lock, there a rite pain. After a run in the car turn it off leave the ignition on, does the temp gauge go up? Quote Link to comment Share on other sites More sharing options...
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