12 miles per gallon!!

[viperkd77]

Prior to exhaust install.... bcs restrictor removal, kn filter, dump tube cut, mbc set at 15psi, got 19-24 mpg...

exhaust install 3inch turboback.... 10-12 mpg, sluggish driving, fast in wot, low torque, bogged ran like a boost leak during partial throttle...black smoke...also sounds like a tractor and really raspy and ricer (in drive, in park, A/T, sounds like it should, deep and throaty)

**not sure if done the same day or a few days after exhaust install (think i did this after exhaust install bc of bad gas mileage)... used fuel injector cleaner with full tank of gas. Did nothing...

boost leak test... leak in tb shaft seals... put 1g tb on... bad idle, but no major boost leaks....

also install dsmlink, adjust tps for 1g tb and fix idle... but still runs like crap after no boost leaks.... and 10-12mpg

tune fuel ratios... fast and smoother in wot, but still eats gas at like 10.5-12.5mpg... idles well.

replace 02 sensor even though good link readings... no fix...

REINSTALLED stock exhaust.... replace ground strap near rear 02.... STILL bad mpg and sluggish!!!

Leaned fuel out even more with link and adjusted timing, faster in wot, but still sluggish and runs like it has a boost leak... Also, got insight from a friend that my bov could be bad and i do have a boost leak...

Did boost leak test last night from turbo inlet... pressurized at 12psi... back down to 5psi within 3 seconds, then slowly from 5 to 0 in like 20 or 30 secs... (is this normal?) slight leak in bov out of recirc hole... why?

Also, i hear a leak on the drivers side of the car...

Also, i hear bubbling

Also, it smells

Do i have boost leaks or not and what in the world is going on with my 97 gsx a/t.. it has been like 2 years since the day she was sitting pretty... PLEASE HELP WISEMAN...

 

[jake247]

fix the boost leaks. spray soapy water everywhere. There are plenty of emissions hoses and lines running around there. The right side of the intake manifold has solenoids and lines for the fuel pressure regulator. The brake booster line is there, maybe the pcv valve has gone bad in it and the hose is leaking. You should definitely be holding pressure longer then you are. You said that you changed the TB, how did you rearrange your emissions lines? You could very well have a check engine light from doing it wrong since the battery has been disconnected and the car hasn't had a chance to check everything out while driving. (have you ever taken it to get inspected (i know alleghany county has emissions) and the guy told you that you need to drive your car around some to see if there are any check engine light codes that will come on?)


Fix your boost leaks. spray soapy water. watch connections & vacuum lines. and as soon as all of the boost leaks are done, redo your link tune because it will be very lean.

If you're still confused, pm me, and i'll tell you to fix your boost leaks.