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hey guys,havent been on here in a while.i finally got to working on the 91 GTZ 3.1.i did what was said to try on the last post i put up.i havent checked the injector voltage yet.i am getting fuel to the injectors,with the right fuel pressure,but the injectors wont open.plugs have plenty of spark and are bone dry.all wiring was checked and no shorted,or broke wires.the fuse is good,fuel pump works!!!!! any advice?map sensor?need to get this going as soon as possabile............thanks in advance!

Bump, for better help than me. Don't change the MAP, it won't help. Hang in there until the big boys show up. I have never ran into this kind of thing so all I can do is guess.

Have you pulled the rail to see if the injector is in fact not firing? That's the only way to be sure. Also I thought since this is MPFI the only sensor that would tell it when to fire the bank would be the crank sensor and since your getting spark it sounds like that's ok...

anyone think it could be the fuel presure regulator????i dont know,just throwing stuff out there........

3X00-Modified wrote:Have you pulled the rail to see if the injector is in fact not firing? That's the only way to be sure. Also I thought since this is MPFI the only sensor that would tell it when to fire the bank would be the crank sensor and since your getting spark it sounds like that's ok...

havent pulled the rail off.gonna try to do that tonight..maybe??

regulator would prevent any pressure... When you turn the key on the pressure builds and the holds after the pump shuts off right?

Next thing to check could be the oil pressure sending unit, on some of those models I think they may have been wired into the fuel pump relay and if there was no oil pressure detected it would kill the pump... But then again I'm only guessing, I'm not sure if that's true or not.

would the oil pressure sending unit explain why when i try to start it it goes all the way pegged as soon as it starts turning over??

3X00-Modified wrote:regulator would prevent any pressure... When you turn the key on the pressure builds and the holds after the pump shuts off right?

Next thing to check could be the oil pressure sending unit, on some of those models I think they may have been wired into the fuel pump relay and if there was no oil pressure detected it would kill the pump... But then again I'm only guessing, I'm not sure if that's true or not.

Yeah that would say something...

Did you install a full cluster into a base car that didn't have a gauge before? If so you just have a "light" type sensor, you need the "gauge" type sensor. one is digital or analog, and the analog one is significantly longer than the digital one, and you need the analog if you have a dash oil pressure gauge.

I have seen Oil Pressure gauges max out when the key is turned on. Mine 3500 does.

ok,after a few days of searching,found the problem.the guy i bought it from went a little deeper into it than understood....must have been distracted,never tighened the rocker arms up!!!!runs like a champ!!!!!!!!!!!!thanks for the help guys!

WOW Im glad it was something simple.

Cool!