1g turbo problem?

588 Views 4 Replies 3 Participants Last post by 90_talon_matt, Nov 21, 2005

Rubberman2003

Discussion Starter · Nov 20, 2005

I have a 90 gsx. I just did a headgasket on it about 1200 miles ago. Has been running great. Today i noticed that when i shifted when under boost, that is puffed a bit of smoke between the shift. Its a whitish/grey smoke. I also noticed in 4th and 5th (maybe third) then when i floor it, my boost goes to around 5 then it drops back off to around 3 for a while, then it builds up to full boost, around 13psi. Before in fifth my boost would build steady to 13 psi, now it takes a long time. On my A/F guage, when it goes to 5 and back down it says its running just a bit rich, 1-2 bars into rich (it did this before it was puffing smoke) Its not very far into the rich zone at all.

Is my 14b taking a dump on me?

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haut

· #2 · Nov 21, 2005

Do a boost leak test.

Also, probably isn't a good idea to rely on the bar/disco light style AF gauges. Pickup one that shows you actual o2 voltage. Or just buy a logger.

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haut

· #3 · Nov 21, 2005

Forgot to add, you're not dumping your BOV to the atmosphere, are you?

That will cause you to be rich on shifts.

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Rubberman2003

Discussion Starter · #4 · Nov 21, 2005

No boost leaks. Im not venting. The turbo has quite a bit of shaft play.

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90_talon_matt

· #5 · Nov 21, 2005

it deffinately sounds like the turbo is going south on you. the smoking and inconsitent boost is how mine started out and then it went for a real sh*t and everytime i revved the car i'd get the spy hunter smoke screen and it wouldn't build boost at all.

oh and haut for your information the disco ball a/f ratio gauges do measure the actual o2 voltage its just not too usefull because its a narrow band 02 sensor.

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