Engine surge/Rpm gauge jumping

[JamesG]

Hi, I the last few months I bought a 1990 eagle talon tsi awd. Its had the head replaced, new head studs, new water pump, new timing belt, new alternator, new air intake, new battery, new spark plugs and wires. After all these had been replaced I turned down the 16g turbo all the way and it still seems to jump to 12lbs of boost. It still has the stock injectors and fuel pump. It has a three inch megan racing catbact, test pipe and down pipe. After replacing the exhaust it seemed to cut out when the turbo passed 10lbs. This is an issue but its not the issue I have ended up with. Driving the car and keeping it under 10lbs seems to run fine. But within the last few days especially today, the rpm gauge seem to jump around Example, When I first started the car and drove it a few blocks away it drove fine. After leaving this place I clearly could tell and feel the engine surging, the rpms would try to drop near to nothing and the engine light would come on. After revving the engine the rpms would jump to normal activity until I released the gas. It would then drop below five hundred rpms nearly killing the car. When trying to drive the car home I would push the gas, it would run normal for literally a second with an imediate surge following. It acts like its either not getting gas or possibly a bad distributor. Someone please help me with this issue, It would be greatly appreciated!! Thanks to anyone with any help, as I desperately need it

By the way, when revving the engine and giving it more gas the check engine light goes off every time, if that helps any..

 

[JamesH]

Not really. Just pull them off. Not much coolant will be lost. Just try to keep them higher then the radiator cap.

 

[TSIGuy510]

alright, guess ill bite the bullet, put a drip pan down and just do it like nike

i made a new thread about all my symptoms and issues please check it out

 

[Diamond Star Werks]

Well said! @4G63Dreams, The only reason I turned down my boost to 10lbs was to keep the car from cutting out @full throttle @higher rpms. The 16g turbo has too much boost to run any higher without a new fuel pump, and fuel regulator. I actually have the boost controller all the way down and it still seems to creep over 10lbs. at maximum boost. The previous owner crushed the stock blow off valve, it also is not recirculating anymore. So im thinkin ill have to replace it with a recirculating valve until I can get it dyno tuned(I had the same issues with my 06' sti when i changed it to atmospheric). If that doesnt work ill need to buy a new boost controller.

Yes If your boost runs too high then you will have a few driveability issues then . How much boost are you hitting when it cuts out? I ran 12lbs off my good t25 that got ruined in the wreck. It never cut out on me though it had a wally 255 but still stock injectors. Crushing usually does just cause problems. Its a cheap way to up boost limits. Sounds like yours is stuck shut. Or you could just upgrade fuel system?

Well there is no way of removing it from the car without disconnection but really like dude said you won't loose that much as long as you keep them higher than the cap.

 

[JamesG]

Well when I am in a power gear, or in the rpm range where the turbo kicks in at full boost(around 3500) The car seems to fly right past tent cutting out some where before 15lbs. But when I am cruising in third fourth or fifth around 2500-3000 rpms the turbo will not pass the 10lb mark, it rather stays right at or below 10lbs. But I am thinking about buying a new fuel pump, fuel regulator and maybe some new injectors. I am also planning on buying a front mount intercooler and new blow off valve. Im not sure what horsepower I am going for at this point, I just want it to run nice and smooth like the Sti.