MysticLT1

iTrader: (1)

ok i need some serious help my car has been running like crap and i dont know what else to check.the car is a 1996 camaro z28 mods long tubes cold air intake LT4 cam 1.6 rr and the LT4 valve springs.. i cant figure out whats wrong with it the only codes coming up is egr and thats because i tore it out and the other code is crank position sensor and its brand new i just replaced it it seems to have 1 good run i just flor it and it will run fine after that i try again and crap just lack of power hesitates really bad and also the car has no tune but that didnt keep it from running good before my opti went out about a month ago replaced it and since then just crap help me out!!!

thanks in advance,
Luis

taner

iTrader: (6)

i would start with the opti.....
have you chaecked all of the simplest things possible...wires, fuel pressure, loose grounds, vacuum leaks? i find it is sometimes the simplest things that you end up chasing your tail on.

g'luck with it.

MysticLT1

iTrader: (1)

i have a new opti maybe 2 weeks old new plugs and wires just as old as far as i know all my vacuums are fine thats why i cant figure it out thanks for the post, fuel pressure is also fine and no loose grounds i have checked for any loose ones

MysticLT1

iTrader: (1)

c'mon guys i need some help i dont know what else to check someone help me out

IllusionalTA

iTrader: (9)

sounds like you have some issues.. Check the timing on the opti, are your 02's active?

TABBED 5.3

iTrader: (1)

i would maybe double check the wires. Maybe they are not right or touching a header, its probably something really silly

phirepower

iTrader: (2)

are rocker arms properly adjusted? check all injectors (the order, and to makesure they are securely in their proper place)

krayzie7th

I am a friends of his, I believe he gots one new o2 sensor but the pcm didnt pick up one of them which we thought it was kind of weird. It would be driving normal but then after a while it just starts going to crap.

azmarkus

Opti, ICM, clogged cat, plugs/wires; skim through the posts on this section and you'll notice a pattern of certain problems that always are popping up.

moehorsepower

iTrader: (3)

[QUOTE=taner;9569116]i would start with the opti.....


Really depends on what is meant by running like crap, at initial startup, after it warms up......Like tanner says, Opti. I have installed Brand New GM Delco Optis from the dealer that were bad right off, Opti also has input to the injectors...

bobdec

Your OP said " and the other code is crank position sensor " are you still getting this code. The CPS in conjunction with the opti is used by the PCM to manage spark and timing, I suggest you get that resolved first. Secondly your friend said " I am a friends of his, I believe he gots one new o2 sensor but the pcm didnt pick up one of them " I think he's trying to say you have an O2 sensor going or staying inoperative. You have LT headers, check for melted wire to O2, did you cut, splice, or solder the O2 sensor pigtail to extend it, if so that would ruin the sensor. Either of the above would cause " running like crap ".

nlzn

I think someone said it already.. I dont see the point of doing indepth troubleshooting without resolving the CAS code.
A faulty reading CAS will destroy any motors ability to run correctly. If the sensor is new Id check the wiring. IIRC theres a secondary harnass for it on the passenger side the of the intake manifold, I think its a 4 pin connector, multimeters are life savers.

I know I might be stating the obvious, but Ive melted plug wires on LTs..