Hello guys, I have a 91 toyota pickup with a 3vze with a couple of mods like MSD, headers, big sparkplug wires and a snorkel. I had a flametrhower injector set installed, but after a while the truck started to get richer and richer until I went back to stock injectors. I would like to know if you know what could be wrong, because I have no check engine light on and I would like to get them back on. Thanks.

 

There are plenty of documented issues with aftermarket injectors..

Are you smelling raw fuel, that's lack of combustion. This is partly based on the altered spray pattern.

Are you measuring the AFR with a wideband?

​​​​Have you inspected the fuel trim value as reported by the ECU?

 

The whole point of having an O2 sensor is so that the ECU can adjust the fuel ratio (by adjusting the injector on-time). If, due to injectors or otherwise, you're dumping in so much fuel that the ECU can't compensate, it throws a code.

If you're running rich and getting no code, you have more problems than just injectors. Run the diagnostic on the O2 sensor, and look at the reported fuel trim as suggested by Co_94_PU.

 

Thanks guys, I a regearing the truck, I think I will get it done by thursday, after that I will check on the codes an look for the 94

 

I run the diagnostic and it did not trhow any codes. Is there another suggestion?

 

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Did you run the diagnostic "on the O2 sensor"? http://web.archive.org/web/201003261...01heatedox.pdf (There's much more than "codes" to getting a truck to run.)

Did you look at reported fuel trim?

 

If you mean directly on the O2 sensor, I did not because I thought that jumping the cable on the diagnosis port would tell me if something was wrong. But since there is another way I will try it and let you guys know.

 

i have nothing of value to add

but i 100% thought this was actually about a flamethrower injector set up in the exhaust or in a cut out or something. which would have been awesome. now i know better