4g63

i have a 90 camaro rs 3.1 v6... ive replace fuel pump fuel filter and just changed the plugs and wires dizzy and rotor... the car gets a little better as the car warms up.. but it still loses power at half throttle and past.... when i floor it in N or P i hear some pops.. i need help!! bad...

PS just wondering could a bad fuse cause all of this?

ex-x-fire

Get a fuel pressure test gauge, should be above 36psi (to 45psi at wot).
Check your ignition timing, make sure it advances when you rev it.
You might have as clogged cat, can you gut it in your area?

4g63

i dont know how to cheack ignition timing

and no i cant gut it we have emissions testing but with in the next few days im going to dissconect the cat to see if is that... i belive i have 2 years before i got to get it tested again

ex-x-fire

You need a timing light to check the ign. timing.

4g63

you said make sure to rev it.... but it wont rev past half throttle so what should i do?

cIaRmOaCrZo

did this all start happening all of a sudden? or did u just buy the car and it had this problem? deffinatly sounds like timing, and esc modules and knock sensors are a prime suspect if this happened instantaniously. if it was a progression, then check out the timing chain. i know the correct amount of wear is suppose to be 40k miles. but no one hardly ever changes them that often

4g63

i got the car it was running perfect then it started acting up... somebody said tv cable i snapped it replaced it changed everything else over time.... before i got it it has been sitting for a while there 116k with everything else factory excpet what i replaced tensnor pully alt and catback

K28

This is definitly a timing issue . . . slap a timeing light on that ASAP

4g63

alright how do i do that.. what do i do... and what is the light supposed to tell me.. and how do i adjust timing on these cars? i need more info then just tell me put a timing light on it lol

ex-x-fire

A timing light has 3 connections, 1 to the postive battery connection, another to the negitive side, the 3rd hooks to the #1 spack plug wire (pass. side front wire).
Get the engine warm, then follow the the instructions on the emissions sticker, this will tell you the timing spec & a certain wire to unplug to put the ecm into timing mode. You point the timing light at the balancer behind the crank pulley, theres a scale on the engine w/ numbers on it, the balancer has a notch. When the engine is running the light will flash & show the timing marks & notch.
If its off you have to loosen the distributor hold down bolt (15mm) slightly, then rotate the dist. till the notch lines up w/ the number on the scale.
Reconnect the timing connector, point the light at the scale, rev the engine & the notch should move up & off the scale.
Do you have a repair manual? If not, get one.