fuel injectors ground wire???

[cesar1]

hey i changed my ECM 86-87 i got the turbo tweek chip and the match and the 60 lbs injectors,i have the mat sensor,i got the car running but my injectors wont open, the only way they open is if i use my light testor on one of the injector wires,thats the only way the car will run but its only one injector working,so the car starvs for gas,i have no pulse on the injectors just a steady ligh,even with a new computer, so ithink the next step is to find the ground wire to the injectors but hsve no clue where can it be,anybody any ideas?any help would be appreciated.and another question iforgot,on what psi i need to set my new fuel pressure regulator is it 43 lbs? thanks.,

 

[Chuck Leeper]

Key on....test lite ground wire hooked to engine...1 wire on the inj harness at every inj should be "hot". The accompanying wire is the ground wire...Each inj has it's own grnd circuit, because the system is sequential.
When you hit the ground wire to ground w/ the test lite, that's why only 1 inj fired....
Fuses good?
Getting rpm signal when cranking?

 

[cesar1]

the fuses seen to be ok check them last night also how do i check for rpms?

 

[TurboBuRick]

The ecm fires the injectors with the ground. Something is missing. Power to ecm, or a wire configuration issue.

 

[cesar1]

how do i check the power to ecm what wire?

 

[TurboBuRick]

Lots of good info here. http://www.turbobuick.com/forums/hot-air-non-intercooled-tech/33080-basic-hotair-info.html

The first post has a nice no start procedure.

HTH

 

[cesar1]

thanx loock that informacion already but still counfused

 

[Jerryl]

hey i changed my ECM 86-87 i got the turbo tweek chip and the match and the 60 lbs injectors,i have the mat sensor,i got the car running but my injectors wont open, the only way they open is if i use my light testor on one of the injector wires,thats the only way the car will run but its only one injector working,so the car starvs for gas,i have no pulse on the injectors just a steady ligh,even with a new computer, so ithink the next step is to find the ground wire to the injectors but hsve no clue where can it be,anybody any ideas?any help would be appreciated.and another question iforgot,on what psi i need to set my new fuel pressure regulator is it 43 lbs? thanks.,

Remove the ECM connectors and locate the common ground at the ECM.
Probe it to ground with a VOM. This is specifically for Vin 9!
http://www.installationinstructions.com/vin9/injectors-fuel system.pdf

Also, make sure the TPS is set correctly (0.42-0.46V).
In the picture it looks to be very high, and it could put the ECM in Clear Flood mode, cutting of the fuel.

Edit;
Try the TPS setting first.

 

[cesar1]

how do i set the tps?

 

[Jerryl]

how do i set the tps?

Adjusting the TPS :wink:

 

[cesar1]

ok i will try that tonight thanx for the info and thanx for being patient

 

[boostmaster]

Injectors

Check the fuses that I outlined in the attachment. If they are good check your ground wires. If all else is checks out you may have a bad cam sensor. I believe the ecm gets it's pulse reference from the cam signal and that tells the injectors when to fire.

 

[cesar1]

im in my garage working on my car right now will look at fuses thanx boostmaster will reply in a minute to tell u another thing i got a new cam sensor from caspers and cam tool to.

 

[cesar1]

all the fuses seen to be ok

 

[MikeStarner]

Cesar if you woulda let me know I could have swung by and helped you check for signals with my powerlogger.

 

[MikeStarner]

I could meet up with you tomorrow to help

 

[cesar1]

I would really like that if you came and helped me with my car. But garage is to small to work on the car, i have two front flat tires, need a new fuel pressure regulator, need to find a place to install my trickflow inline fuel pump cant find a good spot for it yet, dont know what to do. can you tell me which auto parts you work at so i can swing by after work tomorrow and we talk about it face to face. what do you think??

 

[MikeStarner]

Hey I had to leave work to pick up some 100 octane and methanol if you want I'm off all weekend I could help you this weekend.

 

[cesar1]

That would be cool, would sunday work for you later in the afternoon like around 4 or 5,

 

[MikeStarner]

Yeah no problem I'll PM you my cell number