Truck is going crazy

[Mrzllewellyn]

So started with a random misfire went to cyl 4 misfire back to random misfire to lean in both banks to cyl 1 misfire to random misfire again and lean in both banks or misfire lean in bank 1..... Have replace distributor, fuel pump, cap and rotor, MAF, vacuum lines,injectors(whole spider), did a compression test a few other little things.... What could be wrong? 2001 chevy s10 4.3L.... Any help would be great help

 

[snake dr]

Timing?

 

[mtgldr]

O2 sensor?

 

[Mrzllewellyn]

Timings good im so lost

 

[potenza]

Sounds like vortec disease, your going about it with the replace parts till they run out of parts or you run out of money. Did you use a delco vortec spider, sounds like a intake problem (leak)

 

[Mrzllewellyn]

Oh yeah started with replacing O2 sensor bank 2 but it throws lean in 2 intermittantly... Hadnt replace in bank 1

 

[Mrzllewellyn]

It is actually the spider from my original intake that I accidently hydro ceased but new regulator and it's throwing same codes as before so couldnt be that I wouldn't think...

 

[potenza]

I've replaced a bunch of vortecs, never used a old one. Then I only do it once

 

[Mrzllewellyn]

What is the best way to check for intake leak?

 

[potenza]

You can use Carb cleaner and spray around the intake if you notice a difference its leaking