The problems started about a month ago, I lost a lot of power from my 305 tbi 1991 firebird. I know there isnt a ton of speed to begin with, but not its running like a junkyard v6. I started by changing my fuel injector pressure regulator, then my map sensor, tps sensor, checked my timing, complete fluid flush, O2 sensor, and egr valve. Now I hear a ticking in my engine, and if I put my finger on the passenger side fuel injector (on top of it) the ticking is in time with the pulse coming from my fuel injector. I also am getting 10 miles to the gallon compared to my normal 17. Could this be as simple as a stuck fuel injector?

 

chekc your plugs and wires. its very possible that one or two have fouled out.

 

I did the plugs and wires, I went with the 8.5 mm msd wires and stock replcement plugs, dont remember the brand, bosch I believe. I also put in a blue streak cap and rotor.... still having the same problem

 

If you used Bosch plugs the next thing you need to do is take them out put in anything different. Then take the Bosch plugs to a shooting range and toss them as skeet. Bosch does not work very well in SBCs

It could be an injector problem.

AC Delco or Autolites are a good choice.

Verify your fuel pressure.

 

Certainly verify fuel pressure. The BIGGEST problem that I ever have with TBI is loss of fuel pressure - for a variety of reasons. You need to buy the spring (for less than 5 bucks) that allows you to make your regulator adjustable. I like to get near 20 psi.

I always replace the fuel pump on every TBI application with a circa-1997 vortec 350 engine pump from a suburban. It gives you more flow than your stock system will ever need. I have put new TBI pumps in and had the same problem that you are having. Once I replace the pump and convert the regulator, those types of problems leave and never come back.

Hope this helps.

 

I'm not sure if I did my fuel pressure regulator right... could it be as simple as that? also arent the fuel pumps in tank on these cars? how would I replace that

 

It absolutely could be as simple as that. You can buy the spring off of one of the advertisers here (can't remember which one) and if you search this forum for "spring" you'll find it.

You must pull your fuel tank to change the pump. That's why you want a good one and you won't have to do it again for a long time.

 

Check out this thread, it should help!

https://www.thirdgen.org/forums/tbi/...ng#post3234404