starquestG54B Posted February 18, 2011 Report Share Posted February 18, 2011 (edited) well i done a boost leak test today and fixed all but one leak that i cant find down underneath the turbo???i dont see how i could loose boost from under the turbo. its a slight leak .i have a really really ROUGH idle and an accassional missfire but not constant and a exstremly slow acceleration mods listevo3 16G1g mafMSD blaster 2 coilEGR delete new vac lines all the way aroundnew vacuum advanceNXS MBC3inch DPcrappy Mookeeh hardpipescruise control deleterebuilt tbthink thats all Edited February 18, 2011 by starquestG54B Link to comment Share on other sites More sharing options...
Bag-O-Chips Posted February 18, 2011 Report Share Posted February 18, 2011 Directly under the turbo on the Compressor housing? If so... the O-Ring on the Compressor housing may have dried up and split. Link to comment Share on other sites More sharing options...
starquestG54B Posted February 18, 2011 Author Report Share Posted February 18, 2011 Directly under the turbo on the Compressor housing? If so... the O-Ring on the Compressor housing may have dried up and split. on the turbo? its basicly brand new from *DM Link to comment Share on other sites More sharing options...
Bag-O-Chips Posted February 18, 2011 Report Share Posted February 18, 2011 just because it's new doesn't mean it may have been mis-assembled. I've seen those O-Rings get pinched when re-assembling the compressor housing on the turbo. Just becareful with that snap ring. If it snaps back and hits you it will put an eye out. Link to comment Share on other sites More sharing options...
starquestG54B Posted February 18, 2011 Author Report Share Posted February 18, 2011 (edited) just because it's new doesn't mean it may have been mis-assembled. I've seen those O-Rings get pinched when re-assembling the compressor housing on the turbo. Just becareful with that snap ring. If it snaps back and hits you it will put an eye out. the leak is coming from my manifold not the turbo. either the manifold or the head. i cant pin-point it. thanks for the advice though Edited February 18, 2011 by starquestG54B Link to comment Share on other sites More sharing options...
JohnnyWadd Posted February 18, 2011 Report Share Posted February 18, 2011 Thats an exhaust leak than, you said boost leak so you'd kinda expect him to lean towards the leak coming from the turbo. One way to try and find it is use a hose and hold it to you ear while its running and put the other end down by the turbo and manifold. Link to comment Share on other sites More sharing options...
Indiana Posted February 18, 2011 Report Share Posted February 18, 2011 What ever you put in place of the EGR valve it must have a gasket. As in the aluminum OEM type gasket? If that plate is leaking its both an exhaust leak and intake manifold leak because you have exhaust from the exhaust port running through the middle of the head back over to the intake gasket and through the head to where that EGR valve was mounted. Link to comment Share on other sites More sharing options...
Indiana Posted February 18, 2011 Report Share Posted February 18, 2011 You got a heated 02? What your air fuel ratio while idling? What spark plug you using? Link to comment Share on other sites More sharing options...
Earl Posted February 18, 2011 Report Share Posted February 18, 2011 you could also spray soapy water while doing the boost leak test. It will bubble where the leak is. And he has an OEM O2 sensor with no AFR gauge and he's using NGK's. I believe they're BPR7ES-11's Link to comment Share on other sites More sharing options...
mr.andaya Posted February 18, 2011 Report Share Posted February 18, 2011 change the mas to stock until you figure out the prob. you have the old rubber accordan hose? what was replaced when you did the tb rebuild? intake manifold gasket? break booster vac hose? Link to comment Share on other sites More sharing options...
starquestG54B Posted February 18, 2011 Author Report Share Posted February 18, 2011 What ever you put in place of the EGR valve it must have a gasket. As in the aluminum OEM type gasket? If that plate is leaking its both an exhaust leak and intake manifold leak because you have exhaust from the exhaust port running through the middle of the head back over to the intake gasket and through the head to where that EGR valve was mounted. its plated off with a steel type gasket. the same set from 101 on ebay. its not leaking Link to comment Share on other sites More sharing options...
starquestG54B Posted February 18, 2011 Author Report Share Posted February 18, 2011 you could also spray soapy water while doing the boost leak test. It will bubble where the leak is. And he has an OEM O2 sensor with no AFR gauge and he's using NGK's. I believe they're BPR7ES-11's tryed it buddy and it doesnt work. Link to comment Share on other sites More sharing options...
starquestG54B Posted February 18, 2011 Author Report Share Posted February 18, 2011 change the mas to stock until you figure out the prob. you have the old rubber accordan hose? what was replaced when you did the tb rebuild? intake manifold gasket? break booster vac hose? well that idea is out the window. my little brother just droppedit and broke it. i only replaced the lemon shaped o-ring and the tb to manifold gasket. it doesnt leak atall Link to comment Share on other sites More sharing options...
Skullzaflare Posted February 18, 2011 Report Share Posted February 18, 2011 sounds like a bad plug wire too. try removing 1 wire at a time and listen, it should die the idle down to like 300rpm when 1 is unplugged, you will notice it Link to comment Share on other sites More sharing options...
starquestG54B Posted February 19, 2011 Author Report Share Posted February 19, 2011 i just checked all wire and they are all good and secure Link to comment Share on other sites More sharing options...
Shelby Posted February 19, 2011 Report Share Posted February 19, 2011 two things 1 do a comp test, 2 does the head have jet valves ? answer that and we can get going Link to comment Share on other sites More sharing options...
starquestG54B Posted February 19, 2011 Author Report Share Posted February 19, 2011 two things 1 do a comp test, 2 does the head have jet valves ? answer that and we can get going yep still has jet valves and tomorrow i will do a comp test but the last time i did a comp test it was as followscylinder 1 110cylinder 2 90cylinder 3 110cylinder 4 110 Link to comment Share on other sites More sharing options...
The Rabbit1 Posted February 19, 2011 Report Share Posted February 19, 2011 cylinder 1 110cylinder 2 90cylinder 3 110cylinder 4 110.. FSM states: Limit:113 psi no more than 14psi difference between pistons. Did you try adding oil to see if compression would rise? Link to comment Share on other sites More sharing options...
starquestG54B Posted February 19, 2011 Author Report Share Posted February 19, 2011 .. FSM states: Limit:113 psi no more than 14psi difference between pistons. Did you try adding oil to see if compression would rise? no i didnt know to do that when i ran the first test. and they should read 125 accross the boared on all cylinders Link to comment Share on other sites More sharing options...
Skullzaflare Posted February 19, 2011 Report Share Posted February 19, 2011 yep still has jet valves and tomorrow i will do a comp test but the last time i did a comp test it was as followscylinder 1 110cylinder 2 90cylinder 3 110cylinder 4 110remember, unhook injectors, and hold throttle to floor when cranking AllData calls for 113-142 Link to comment Share on other sites More sharing options...
mr.andaya Posted February 19, 2011 Report Share Posted February 19, 2011 if you have a big enough intake leak it will miss badly, have you checked your intake manifold bolts? Link to comment Share on other sites More sharing options...
Skullzaflare Posted February 19, 2011 Report Share Posted February 19, 2011 well i done a boost leak test today and fixed all but one leak that i cant find down underneath the turbo???i dont see how i could loose boost from under the turbo. its a slight leak .i have a really really ROUGH idle and an accassional missfire but not constant and a exstremly slow acceleration mods listevo3 16G1g mafMSD blaster 2 coilEGR delete new vac lines all the way aroundnew vacuum advanceNXS MBC3inch DPcrappy Mookeeh hardpipescruise control deleterebuilt tbthink thats allwhen you did a leak test, did you run it into the engine or did you also block it off at the throttle body? if you ran it into the engine it could just be leaking on a mid stroke or you have a jetvalve stuck (i had a jet valve stuck in the summer, ran like crap) Link to comment Share on other sites More sharing options...
starquestG54B Posted February 19, 2011 Author Report Share Posted February 19, 2011 if you have a big enough intake leak it will miss badly, have you checked your intake manifold bolts? EXHAUST MANIFOLD. (under the turbo) Link to comment Share on other sites More sharing options...
starquestG54B Posted February 19, 2011 Author Report Share Posted February 19, 2011 when you did a leak test, did you run it into the engine or did you also block it off at the throttle body? if you ran it into the engine it could just be leaking on a mid stroke or you have a jetvalve stuck (i had a jet valve stuck in the summer, ran like crap) yeah stuck it into the turbo and let her rip. the only leak i hear now is coming from under the turbo. is it possible that i have a bad head gasket? because im doing the test thru the motor and its sounding like its leaking where the head meets the block Link to comment Share on other sites More sharing options...
StarquestRescue Posted February 19, 2011 Report Share Posted February 19, 2011 There is always some air that leaks past the throttle plate and goes out the exhaust. Link to comment Share on other sites More sharing options...
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