I've got a stepchild project I've been trying to get running for about an eon, and finally got it to crank yesterday. I'm getting fuel to the TBI, and power to the injectors, but no spray. After reading the boards, I remembered that I robbed the coolant fan switch plug for my other car, would this have any effect? Re-built injectors are like $75 apiece and that's just stoopid. Can they be cleaned or tested easily. Thanks for any help.

 

Fan switch shouldn't affect the injectors.

The '89 - '92 f-body TBI ECMs support VATs. Not sure of the project, but if you are using one of those ECMs it needs a VATs box signal before the injectors will fire.

RBob.

 

If there were no vats signal, would the fuel pump come on at all? I thought VATS controlled the fuel pump relay as well as the starter relay. I'm getting lots of fuel to the throttle body, it just doesn't seem to be coming out of the injectors at all. Any help is appreciated!!

 

VATs has no affect on the fuel pump relay. It will prevent the injectors from firing.

RBob.

 

if the ECM is getting a CKP signal yet the injectors are not being triggered i would say ther is either a problem with the ECM or like stated a VATS problem. do you have access to a scan tool and noid light? if not there is cheaper (red-neck) ways to test these.