i am swapping from tbi to tpi on my 89rs and i really need some help, i put all of the tpi stuff and wiring harness in my car i got all the fuel gas and air hoses on, every wire is conected and my car will not start. I am getting spark and the car will crank but i am not getting fuel, i hooked the auto xray to my car and it said my car was not responding. i got my fuel pump in but it will not pump any fuel, checked all the fuses and they are all good. well i don't really know what to do right know i cant figure out why my fuel pump is not pumping any fuel and why my car is not resonding to the autoxray. if any body could give me any anvise on what i can do to do fix some of these problems please help. thanks

 

There could be a hundred reasons for your trouble, but without actually being there, you're going to have to work through it yourself. Do you have a good set of schematics and input/output diagrams? I had to repin the dash connectors and rewire some of the underhood stuff to get everything working, and without the prints, it would have been immpossible.

 

well i have the diagram for the camaros but not for firebird wich is where the harness came form. i have been able to find out some of the problems. I need a fuel and maf rely swicth, I know i need those for sure becouse my fuel pump will not prim but when it comes in direct contact with a 12v power it prims and i was able to start the car for a secound then it died. I will have to put one on the car and see what else is wrong with it once i get that done i will let you kno what is up. thanks for the help

 

Yeah, I did the same thing. I put an 87 TA TPI in my 88 Camaro. It took a while, but it's worth it when it's done. Good luck.

 

do you have the wire from the fuse on the passenger side fender area connected to the wiring block by the radiator. There should be 4 wires there. As far as the ALDL connector, make sure M is attached to E. Its a serial connection so M has to be the same as E. You'll probably have to cut M and splice it into E to get the autoxray to work. heres a photo if it helps for your fuel pump problem.

 

What year is the TPI setup that you put into it?

If the fuel pump won't pump, there's a good chance it's not getting power, but we can't know unless you specifically test for that.

The thing I'm getting at is that the fuel pump power lead changed "routes" from 87 to 88. The "trigger" lead used to go through the IP connector, then ended up going through the bulkhead connector.

At the basic level, you need to start testing at the fuel pump relay and see if power is getting to it. If it is, then see if it's getting to the pump itself. If not, the pump is pooched. If power gets to the relay, but not to the pump, then you need to see if power is going to the relay coils and if the ECM is grounding that relay. The other power source for the fuel pump is via the oil pressure switch (located just above the oil filter on an 89). That switch should close when there's 5 psi or more of oil pressure. Usually cranking the engine is enough to make that much pressure so while you're cranking you should have power to the fuel pump.

 

I know that one of those wires goes to the battery but where do the other three end up at? and what is the fuse that was there for?

the car that i have is an 89 camaro and the harness is from an 89 formula so not all the wires are the same. but if any body has an 89 tpi firebird, doyou know what the two plugs that look like a a relay swicth would plug on to it is for? i could not find it on the camaro manual and i don't know if i need it pluged to a relay in order for some thing to work.

well i found out why my fuel pump was not working, the constent hot wire was cut form the wiring harness when they took the harness out of the formula so i didn't know what it was supose to go to, so i just pluged it into the battery and the fuel pump primed so i got that figured out. but the car still wont run it will sart then trun off right away and i dont' know what it could be, and know i have a dead battery for tring to start it so many times haha well if it is not one thing it is the other i will just have to get it charged.

thanks for all the help

 

It's possible that extra relay plug is for the popup headlight motors.