need advice

[rockyracoon]

Ok ,my 92 LX just doesnt seem up to have much get up and go, it is basically stock with 134k on clock.so far I have ran eec self test,system passed,ran cylinder balance,system passed,ran compression,got between 150 and 154 PSI in all,full tune up,plugs set @ 0054 plugs looked good, set timing @ 14*with spout out then reinstalled,cleaned mass air,adjusted TPS,swapped out timing chain,picked up a little more power.rear gears are 308s. checked fuel PSI,it was aroung 34 @ idle and like 42 with vac line off of regulator.the one thing that Im pretty sure is the bypass in the fuel pump is not working properly cause as soon as I shut the car off the fuel PSI dies immediatly and the car cranks like 5-7 revolutions before it starts. car will spin the tires pretty good if I dump clutch into ist but will not chirp 2nd most of the time,however that is not speed shifting .gas mileage is not very good,prolly around 14mpg.am still running CATS with stock H pipe.the only direction I can think to go is that the cats are partially plugged or something, but I would think that that would cause a code to be thrown.maybe a cyl leakdown test?Im not sure where to proceed.

 

[1SLO306]

i think full exhaust will help a hole lot. the stock system is restrictive.

 

[slow5poh]

hmm. Wel my 92 is stock save 3:55's, shifter, pullies, and full exhaust. In cold weather, without speed shifting, it will burn em in first, second, and a tiny bit of third. And its a heavier GT. So, i agree with above poster, get some exhaust, maybe jump to a numericaly higher gear set in the rear.

 

[slow5poh]

oh and u might have clogged cats as well. Did it use to perform better? SOme advice, i recommend going with a 2 cat replacement h-pipe over the o/r version. Just my .02 I had an o/r pipe and it seemed to loose low end torque, i did not like it.

 

[rockyracoon]

Ok but shouldnt a 5.0 with stock exhaust and rear gears at least chirp 2nd on a regular basis.I have 373s that im gonna install this week but id like to know if there is some type of problem before I install em.

 

[slow5poh]

My 92 GT had 2:73's. It wouldn't chirp second at all when it was stock, and that was a manual. I would put shorty headers, catted 2.5" H pipe, and 2.5" tails, pullies, shifter, and toss in your 3:73's. Its hould make a decent difference. IMO

 

[vristang]

With all the testing you did, you can rest assured that the motor is in good shape.
Good job starting with that, most people don't.


Swapping the gears will make a big difference.