I have a 89 sunbird GT turbo conv. i unplugged the vacuum line for the waste gate and now when i hit 4800-5200 rpm the motor shuts down and when the motor idles down a little it turns back on with the check engine light on. but it stays on for about 3 sec. then goes out. someone told me there is a safety thing that makes it do that.is there a way to bypass it. if there is please tell me how....
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Re: sunbird turbo kick out
When the fuel system can"t provide any more fuel it will cut off (similar to electronic speed cut) to save itself from leaning out. Its not a good idea to take that hose off as it will boost itself to death, it has no way of controling how much boost is run and it'll be a matter of what goes first, the engine or the turbo.
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Are you getting turbo boost pressure, waste gate may be open check waste gate actuator. Check that BOV is not stuck open you could clean with some throttle body cleaner. http://www.youtube.com/watch?v=govRsNtY8DM
Sounds like the waste gate is having trouble. It could be what's called a "boost leak". the waste gate is most likely internal on a factory system. On the turbo, You'll see a small, vacuum pod looking thing with a linkage connected. Check to make sure the vacuum line/hose is properly connected and run that line to make sure it's not cracked some where.
Otherwise, it could be any coupler, connection on the pipes that carry the air from the turbo to the throttle body. Even a "loose clamp" can cause boost leaks. With over boost, it's most likely the waste gate.
Good luck. Hope ya find it.
I would start looking at your boost control valve and vacuum lines going to your turbos waste gate, as well as the recirc/bypass valve. Usually when cars don't boost they have either stuck open waste gates or recirc valves. Or something is blocking the boost control valve from releasing the waste gate. Also make sure that all your intake hose clamps are tight so they are not releasing boost prematurely.
The turbo charger has more to do with rpms than road speed.The turbo uses exhaust gas leaving the engine to push more fresh air into the engine thus creating higher compression and more horse power.You should feel some boost above 1500 rpms if everything is working properly.If not then you should have the system checked by a dealer or a good diesel shop.Good Luck!
have a look at the EGR valve if its stuck open you loos all the turbo boost till the EGR valve closes
it could also be the turbo gate valve (wast gate) sticking open so the turbo cant cut in till its screeming then the gate shuts and the old girl picks up her skirts and go's,,, you may get away with just blanking off the EGR valves to try them out but the turbo is a different mater,,,
you need to check the pipes that connect the turbo to the exhaust manifoilds these are common to leek at the gasket if there is to large of a leak turbo wont work properly the waste gate on these motors is actuated with oil pressure if the turbo pedistal mounting seals are bad turbo wont work right ethier waste gate isn't adjustable