SR20DET high rmp problems, need help!!!

[rockqian]

Hello, I have couple problems on my sr20det black top, I did some research and found out some possible reasons...

OK, here is the problem.
1. My car runs great under 3500 rpm, but if I floor the throttle and above 3500rpm, some white smoke comes from the exhaust(sometimes, not always), and sometimes when I rev the engine. I tried to google the problem, someone says it because the coolant get into the engine, but I checked my coolant for couple weeks, it didn't decrease. And also have some people says that caused by a bad turbo seal or ring..

2.This problem still happened at high rpm. After above 4000rpm, and only on 2nd+ gear (I believe so, I didn't see the problem at 1st gear), the turbo doesn't working good, the car feels like hesitate, loose power, and feels like the turbo has "asthma", just shake the whole car...sorry for the improper description.

So by combine those problems, I guess the problems come from the bad turbo seal, is it right? I really hope somebody can help me out...Thank you!

And it is a 1998 kouki

[rockqian]

Help me please T T

[fliprayzin240sx]

Yes more than likely the white smoke is due to a blown turbo. Pop the intake tract off, feel the impeller and check for shaft play. Its okay if it moves around a bit but if you can pull it in and out, its done.

As far as your other issues...that's not related to the turbo. Check your timing and make sure your base timing and CAS timing is good. Then check your spark plugs and make sure they're good and gapped properly (.030).

[ultimateirving]

Also it sounds like you may be experiencing a boost leak too. One thing that is very important is to make sure your whole system is vacuum and boost leak free. Do some research on how to build a tester and make sure to fix any leaks. You will thank me later

[rockqian]

Yes more than likely the white smoke is due to a blown turbo. Pop the intake tract off, feel the impeller and check for shaft play. Its okay if it moves around a bit but if you can pull it in and out, its done.

As far as your other issues...that's not related to the turbo. Check your timing and make sure your base timing and CAS timing is good. Then check your spark plugs and make sure they're good and gapped properly (.030).

OK， I will do that, thank you!

[rockqian]

Also it sounds like you may be experiencing a boost leak too. One thing that is very important is to make sure your whole system is vacuum and boost leak free. Do some research on how to build a tester and make sure to fix any leaks. You will thank me later

Thank you for helping me first, I will do the check!

[Mikester]

Sounds like what an SR will do after getting juiced with octane booster. If you have, or have ever used any injector cleaner/octane booster, you need to run it dry, change your spark plugs and never use it again.

It may be minor blow-by starting to happen, too (the smoke, not the hesitation).

[idc101]

yeah i have the same problem i have a black top too the car drives fine under 4000 but when i get on it and u start to hear the turbo spool! you feel it pull and then like hesitation and shakes a bit! but no smoke! i can also smell a bit a fuel and i read online that if you run too rich the car will drive like shit when you get on it. they talked about a tps adjustment wtf is that? no white smoke no shaft play! sorry for shitting on ur threadi just need help too!

[Rak123]

TPS stands for throttle position sensor. It's possible your coilpacks are bad and the spark is blowing out under boost/high rpms.

[kota2240]

Did you guys make any recent changes /mods to your cars or did it just start happening? recent swap?

[blkvrtswp]

To both of the posters - find and fix your BOOST LEAKS.

Or

Buy a new ECU, TPS, CAS, MAF and when you figure out that that is not it, fix your boost leaks.

[idc101]

TPS stands for throttle position sensor. It's possible your coilpacks are bad and the spark is blowing out under boost/high rpms.

is there a way to check your coilpacks are good?

[idc101]

[QUOTE=kota2240;5241269]Did you guys make any recent changes /mods to your cars or did it just start happening? recent swap?[/Qw

well the car had been sitting in the back yard over a year not one start at mybuddys house and when we tried to start it up wouldnt start!fuel pump fuse kept blowing and stuff so we got a new fuel pump car now starts and but it has the problem

[Mikester]

Shitty, old gas.