no injector pulse on #4

[dkdeleon68]

I have pulse on #1,#2 and #3. but no pulse on #4i've checked wires from ecu to injector and i cant find the problem

[s13sr20chris]

are you missing the power or the ground?

[dkdeleon68]

WHAT DO YOU MEEN POWER OR GROUND????DO YOU MEEN TO THE INJECTOR ?IF SO , NO I CHECKED THE WIRES COME'N FROM THE INJECTOR TO THE ECUTHEY CHECK OUT FINE.

[NISTECH]

Cehck for power to the injector with the key on. the injectors get power from a relay not the ECM. The ecm only grounds them.

The ecm decides to fire the injector based on crank angle sensor input.

[dkdeleon68]

I've checked it with a noid light and no light pulse

[NISTECH]

I got that but did you use a volt meter and see if it is even getting power to one of the leads? All the noid light tells you is if the ECM is pulsing it ,providing it has power. You need to establish weather or not it has power.

[dkdeleon68]

yes its gett'n power.

[s13sr20chris]

thanks for phrasing that so much better bro.

sounds like you are not getting the ground from the ecm? you now need to check that the ecm is getting the signal from the crank sensor. do you have a lab scope?(i know its a longshot) or a scan tool?

[dkdeleon68]

No sure dont is there any other way to check
Modified by dkdeleon68 at 1:18 AM 6/18/2005

[dkdeleon68]

HELP IM DROWNING OVER HERE.JUST JOKE'N but i still need help with injector please

[NISTECH]

You need to be able to check the crank angle sensor input to the ecm, the only way to do that is with a oscilliscope. A volt meter will not work to determine is the number 4 pulse is getting to it.

You could pull the distributor cap off and then the rotor and finallay the plate under the rotor and look at the pick up wheel in there and make sure there is nothing covering any of the holes on it. dont remove the wheel and be carfull with it as it is delicate. If you see a spider web or something else covering some of the wholes wipe it off and recheck the car.

[dkdeleon68]

I did'nt find any thing blocking the holes it looked clean

[NISTECH]

Then you will probably need to pay some one to do the pulse check with a scope.

[dkdeleon68]

my roommate said he has an o-scope.so how do i go about checking pulse with the scope?could it be that my ecu is bad?
Modified by dkdeleon68 at 9:01 AM 6/19/2005

[NISTECH]

It could be thats what you need to determine. ok set the scope up as follows, 5 volts per division and 20ms per division. you should have 4 wires coming off your distributor. 1 is power and 1 is ground and the other 2 are your 360 and 180 signals. these are the 2 you want to check while the car is running. At this point if your roomy has the meter he will know what he is looking at and be able to determine that something doesnt look right.

[s13sr20chris]

man you are on fire scott!

[NISTECH]

I am spending more time here to keep me away from spending money on my own 240 right now. I have been looking at the tein catalog and really really like the driving spec type flex dampner kit and the EDFC control kit...[tongue hanging from mouth and drool dripping on my lap type looking] I have also been fantasizing about the BRM SS exhuast as well. But unfortunitly my wife has issues with me buying anything more for it right now so I need something to do to keep me away from the car.

[dkdeleon68]

I am spending more time here to keep me away from spending money on my own 240 right now. I have been looking at the tein catalog and really really like the driving spec type flex dampner kit and the EDFC control kit...[tongue hanging from mouth and drool dripping on my lap type looking] I have also been fantasizing about the BRM SS exhuast as well. But unfortunitly my wife has issues with me buying anything more for it right now so I need something to do to keep me away from the car.

the only way to keep your mind off of them is,

TO BUY THEM. LOL.