hey guys i need help my cars had problems it would back fire and sputter on wide open throttle. so i changed the opti sparl and spark plugs. the problem went away for a few days then it started to bogg and it felt like it was trying die on me when i try to accelerate. all the symptoms came back so i immediately change the the opti again and icm, coil and wires. Now it runs worse. At idle i can rev up the motor and its sounds ok but not crisp with no back fire. But when i put it in drive and punch it to wide open throttle it boggs and back fires like a machine gun. When im cruising conservatively and slowly accelerate it picks up and goes with no problems but as i hei wide open throttle it sputters and back fires. But when im cruising and slowly accelrate to wide open throttle i have multiple misses NO back fire whats going on im out of ideas? Please i need help any advice?

 

Sounds like a clogged cat, or possibly your water pump is leaking on the opti.

 

Could also be shitty gas, or faulty fuel pump. Is it throwing any codes?

 

its not throwning any codes for some reason i have a new water pump i use meziere water pump and i have no cats just long tubes. Can a bad fuel pump cause back fires? and horrible driving at wot

 

the water pump is good i replaced with meziere elec pump and new seals. I have no cats i have long tubes running straight out.

 

Cant be gas i only use 93 and the pump may be going bad. one point of time it ran good then a few seconds later of it running good with slight misses it went to hell all over again with the insane back fire at wide open throttle

 

I am not sure if they have Sheetz gas stations in Baltimore but you want to avoid getting gas there at all costs. They ruined my formula before i figured out what was going on. How many miles are on the car? My money is on a clogged cat though. Check your fuel pressure and get the codes read.

 

Oh n/m i didn't see your other post

 

I get 93 at bp. Im kinda stumped cause im not getting any codes you know. So im gonna change the fuel pump and see what happens but i doubt its the fuel pump. some one else told me cause its dumping gas well i will put a fuel gauge to it on the weekend and go from there. But i have changed the opti multiple times in just a two week period. Lol i got beter at. I timed myself and the recent opti i replaced took me 1hr 6 min

 

oh yeah i have no codes

 

Okay this thread has gotten jumbled confusing. Did you take it to a place to have it completely scanned? Not Auto zone but a actual diagnostic readout? This usually costs like 80$ at pep boys or someplace like that. Sometimes they wont trip the ses light but will still have codes. Anyhow get a gauge and check the fuel pressure at the schrader valve, it should be around 43 lbs.

 

Here are a couple useful threads about fuel pumps. I just went through the same bs with mine.

https://ls1tech.com/forums/lt1-lt4-m...fuel-pump.html
https://ls1tech.com/forums/lt1-lt4-m...like-crap.html