Heater core or vacuum hose? Reply #75 – April 02, 2008, 01:19:53 AM stuck injectors dont blow headgaskets.stuck which way,,open or closed.if closed, then the piston will simply sit there and cycle up and down keeping a nice breeze going across the top of is piston.if open,, the fuel will dump and likely thin out the oil. The cylinder and head will carbon up and eventually weak spark will occure due to a fouled plug, which wont take long. If your really unlucky, Too much fuel might crack a compression ring. I cant see a stuck open injector being the "CAUSE" of a blown head gasket.maybe someone will correct me if im wrong but i just dont see either senerio being the root cause.want my honest opinion,,?I think you need to tear this bitch back down and start from scratch. you've spent wayyyyyy too much time looking at the surface. Quote Selected
Heater core or vacuum hose? Reply #76 – April 02, 2008, 01:30:19 AM Both heads ended up being remilled the same amount after all was done - .007 I believe. I will retorque everything when "warm" this weekend as I'll be yanking the intake anyways so its the perfect chance.The problem has come and gone and done different things that apparently seemed to fix themselves. It started with no start but there was fuel and spark. This was intermittent and went away by itself...then it went to dealing with head gaskets from bad fuel injectors, etc. For the last 6 or so weeks I've been finding time every few weekends to do something on the car to move forward but haven't had enough time to do all the testing I'd like - weather has not been good on the weekends I've had available. From what I'm seeing, I may be yanking the timing cover and lower intake off and resealing them so I can know for certain that they are fine. I'm hoping its a lower intake leak because after all, it DOES have to mate up with two different surfaces and get close enough to the block to seal with the rubber gaskets (plus rtv). Timing cover is a little more of a pain to yank...Machine work and checks were done in a shop but the engine was built in a clean garage (and bagged when sitting) with all new bolts, gaskets, etc. Rebuilt fuel injectors and reused the fuel rails from the car. Heads were freshened up (only had 30k miles) at the shop. The cam was reused without needing anything. New timing chain, 2 water pumps, 3 thermostats, cleaned out smog pipes and such. The motor "shouldn't" be having these problems but the only way to know is to tear it all down again and check each gasket mating surface in search of the leak.Other than some stupid mistakes we've run into (one being missing fuel which turned out to be the cutoff being partially unplugged), it still appears even after tearing much of it down that we've had more problems with parts than with the way things were installed. An exception being the heads were initially on backwards - smog pipe holes and all :p Waste of a couple hours and $50 in head gaskets. Quote Selected
Heater core or vacuum hose? Reply #77 – April 02, 2008, 01:37:51 AM Quote from: jcassity;212146stuck injectors dont blow headgaskets.stuck which way,,open or closed.if closed, then the piston will simply sit there and cycle up and down keeping a nice breeze going across the top of is piston.if open,, the fuel will dump and likely thin out the oil. The cylinder and head will carbon up and eventually weak spark will occure due to a fouled plug, which wont take long. If your really unlucky, Too much fuel might crack a compression ring. I cant see a stuck open injector being the "CAUSE" of a blown head gasket.maybe someone will correct me if im wrong but i just dont see either senerio being the root cause.want my honest opinion,,?I think you need to tear this bitch back down and start from scratch. you've spent wayyyyyy too much time looking at the surface.All I know is that the bad fuel injector cylinder blew the gasket between it (cylinder 7) and cylinder 6 - down near the water jacket. I'm not saying there wasn't an issue beyond that but I don't think it dumping fuel into that cylinder helped matters. Pulling the spark plug out, fuel just dumped out the hole. We had to disconnect the y pipe just to place it as safe as possible so nothing happened there either as fuel was dumping into the exhaust. Either way, it was just a dangerous situation and I used up half a tank before I knew what was going on. At least this told me the fuel pump didn't have a problem.I'm honestly just wanting to start over with a decent Dart or BOSS block, some fresh gt40p heads, 24lb injectors, etc. I would build the above blocks with 8.5:1 compression to give me room to play with a vortech. Whatver I can do for power but keep from having to pay 50 cents a mile in gas I'll do (still pull 31mpg average tops with this motor and 27-28mpg when more heavy footed). For all I know, the block's got some weird crack somewhere that is impossible to test for without tearing the block down. I'm not sure of anything anymore but thats what the weekend(s) are for.Either way, I know what I'm looking at next and its easy to test before putting it back together as I just need to pressure the system before bolting all the topend back together after the intake or timing cover. Quote Selected
Heater core or vacuum hose? Reply #78 – April 02, 2008, 01:42:21 AM it would be nice if you cold loop back the heater core hoses , stuff a golf bull up in each rad hose and clamp.,,then remove the coolant temp sensor (single red wire) and use that hole to insert air.then you could listen for the leak and isolate where on the motor the defect is. Quote Selected
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