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Bad Symptoms

SuAvE-1

By SuAvE-1,
in Engines & Forced Induction

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SuAvE-1 Collaborator

SuAvE-1

Posted
Posted

hey all

I recently imported a 1990 r32 gts-t. Its very stock and in pretty good nick, except for the following two things. It has 104,000klms on the clock, 100k service done at 97,000. The car runs perfectly. No funny noises except for a bit of tapping from the rocker cover, no leaks, etc.

I'm a pretty experienced DIY'er and know what different colours of smoke mean amongst other stuff.

1. I've been told that when i accelerate hard and then let off (say when changing gears) i have a small puff of white smoke from the exhaust. This is after the car is warm and has been warm for a long time. Can anyone tell me what is causing this? I don't have any other form of smoke coming from the exhaust except for the early morning condensation.

2. I recently installed an A/F ratio gauge in the car. I know they are pretty useless, but the actions of the thing got me thinkin. Under acceleration, it runs slightly rich and doesn't fluctuate the entire time under acceleration However, when at cruising speeds, holding acceleration it will hold stoich for 5/6ths of a second and bounce to very lean breifly for 1/6th of a second and keep repeating that cycle the entire time i'm at cruisin acceleration. It seems like a miss of some sort, any help???

Sorry for the long ass post guys. Thanks for your help in advance.

BTW - i've searched through many pages on the white smoke thing, only to find that people say that "its bad". HOW BAD??

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wrxkilla Mentor

wrxkilla

Posted
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Hi,

Are you sure the puffs of smoke are white?

If they are white smoke, the high probibility is that your turbo is dying.

definately time to rebuild the turbo methinks?

michael

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Abo Bob Grand Master

Abo Bob

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Either of those two things will do it. I reckon more likely your turbo is on the way out. It will probably die slowly so don't stress but put some $ aside.

$300-500 should get you a second hand RB25 turbo which will be a nice little upgrade.

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lordsnipe Community Regular

lordsnipe

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A/F gauge should be rich on WOT and bounce back and forth from lean to rich/stoich when cruising. This is because the ECU is in closed loop and is feeding fuel based on the oxygen sensor readings. It will lean it out till it gets too lean, then richen it up till its too rich. Keeps on doing this hence why you see it going back and forth.

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