No fuel in cylinder 3 and 4...

[phillabaum03]

I've checked about everything, from lines, to pump, to fuses/mpi relay. The cars getting fuel to cylinders 1 and 2, but not 3 and 4. The injectors have power, according to the noid light. Could the cam position sensor went bad? Would a bad CPS not send fuel to 3 and 4? I'd love the .02cents guys, thanks

 

[dsm-onster]

How long has the car/injectors been sitting. I've had several denso injectors just freeze up on me. I pull them out and work the pin (open and close while blowing into the inlet) and they free up and work fine.

 

[phillabaum03]

its not the injectors, or the ecu. Only thing i havent swapped is CPS.

 

[dsm-onster]

It can't be that because the others are squirting fuel. And you're getting power to the injectors. How do you know it's not the injectors? Have you pulled the injectors and pushed on the pintle? If they move slightly then it's not them. If not, then. . .

 

[architechnik]

How are you testing if it's not getting fuel to those cylinders? If you say that you tested the injector plugs and they are showing pulse, then the only other thing is the injectors, as monster has suggested.

 

[phillabaum03]

i pulled the rail and injectors out and sprayed into the air, and the only 2 spraying were 1 and 2. one of my teachers, who is famous to dsm's nate, also tunes at slowboy said the same, that theirs no fuel gettin to 3 and 4. same thing as if you pull the plugs. 3 and 4 are dry and 1 and 2 are wet. i just dont know what else it could be. Anyone live around Blairsville PA? Come fix my car

 

[phillabaum03]

this is what I asked a member on here. And he says he had the same problem and it was his CPS.


(ME) hey dude, its me. The guy with the fuel problem to cylinder 3 and 4. You said it was the cam position sensor? You think thats bad? Its getting fuel to 1 and 2 just not 3 and 4. let me know what you think man

(HIM) Yeah, i had the exact same problem, my car was in the shop for 3 months just replacing parts. Finally took it somewhere else and all it was was the 110 dollar cam position sensor.

 

[dsm-onster]

i pulled the rail and injectors out and sprayed into the air, and the only 2 spraying were 1 and 2. one of my teachers, who is famous to dsm's nate, also tunes at slowboy said the same, that theirs no fuel gettin to 3 and 4. same thing as if you pull the plugs. 3 and 4 are dry and 1 and 2 are wet. i just dont know what else it could be. Anyone live around Blairsville PA? Come fix my car

Sticky 3 and 4 injectors will do the exact same thing. If you don't have a known good cas to swap in, then it's a $100 test. Or you could eliminate the other possibilities first. If your cas was not working properly, why would you get current flow to the injectors that don't work? If you're getting current to those injectors, then why are the plugs dry?

It's happened to me on more than 2 occasions.

 

[92awddsm]

If it was the cps(cas), the noid light wouldnt even light up. Either your injectors are bad or there is something clogging the fuel rail between #2 and#3 injector(if you are numbering the injectors 1-4 from left to right).

 

[phillabaum03]

idk guys. Im pretty lost. I been messing with this car for over a week now and I'm getting frusterated. I guess I can take my rail off and check, but if there was something stuck in there, then how would the fuel get past to cylinders 1 and 2? I cant remember, but I believe I swapped the injectors that were spraying into the cylinders that werent and nothing. The thing is, the injector clips have power, but no pulse....
help me

 

[phillabaum03]

If it was the cps(cas), the noid light wouldnt even light up. Either your injectors are bad or there is something clogging the fuel rail between #2 and#3 injector(if you are numbering the injectors 1-4 from left to right).

and im pretty sure #1 cylinder is always on the timing belt side, correct me if Im wrong

 

[steve]

and im pretty sure #1 cylinder is always on the timing belt side, correct me if Im wrong

What you forgot is that left and right on a car are always relative to sitting in the drivers seat. So on a 1G the timing belt is on the left hand side of the engine bay.

I assume that from your postings your noid light tells you both that there is power to the injector harness and when the injector is pulsed? Does it have it's own ground connection?

Do all the injectors pulse or only 1 and 2?
Have you checked the wires between each injector and the ECU?
Have you pulled the CAS and checked the signals for crank and cam angle while you turn the CAS?

 

[phillabaum03]

What you forgot is that left and right on a car are always relative to sitting in the drivers seat. So on a 1G the timing belt is on the left hand side of the engine bay.

I assume that from your postings your noid light tells you both that there is power to the injector harness and when the injector is pulsed? Does it have it's own ground connection?

Do all the injectors pulse or only 1 and 2?
Have you checked the wires between each injector and the ECU?
Have you pulled the CAS and checked the signals for crank and cam angle while you turn the CAS?

The only 2 injectors that light up the noid light are 1 and 2. But when i check for power at the injector clip, they all have close to 12 volts. I havent had the CAS out yet. If I do, I might as well replace it i'd figure. But would a BAD CAS cause 2 cylinders not to pulse?/get fuel? thanks man. This no car thing really sucks

 

[steve]

So your noid light works like most and only lights when the ECU pulses the injector.

You need to measure voltage on both pins at the harness (make a note of the color of the wire for each pin) with the ignition on. You also need to measure the resistance of the injectors (across the two pins on the injector).

Have you tried swapping the injectors to see if the problem tracks the injector ir cylinder?

 

[phillabaum03]

So your noid light works like most and only lights when the ECU pulses the injector.

You need to measure voltage on both pins at the harness (make a note of the color of the wire for each pin) with the ignition on. You also need to measure the resistance of the injectors (across the two pins on the injector).

Have you tried swapping the injectors to see if the problem tracks the injector ir cylinder?

ok, so today we found out on the injector clips that the test light lights up even with the ignition off, so all my teachers say it shouldnt be like that and that the ecu is fried...Sound legit to you guys? The two that do have pulse do not light the test light when the key is off, only the two that dont which obviously means their constantly grounded. what you think steve?

 

[steve]

ok, so today we found out on the injector clips that the test light lights up even with the ignition off, so all my teachers say it shouldnt be like that and that the ecu is fried...Sound legit to you guys? The two that do have pulse do not light the test light when the key is off, only the two that dont which obviously means their constantly grounded. what you think steve?

I think your teachers are correct in that it shouldn't do that but that they are confused about the cause. Just where do they think the power is coming from with the key off?

Let me know when you have finished the measurements from my last post.

 

[phillabaum03]

idk man, wyotech for ya...i think they just think the injector drivers went bad inside the pcm. when I opened it up to check for leaking caps a small piece of sauder fell out..

 

[steve]

Solder fell out? Somebody been working in there?

 

[phillabaum03]

yeah, and that i couldnt tell you. I asked the kid and he said he's never opened it. I bought a turbo 2g ecu today off nate. Since 95's my year came with eprom, i can use one that dosent have eprom right?

 

[steve]

You can use a non-eprom from 95 or 96 in a 95 without changing anything.

Do you realize this is the first time you've said anything about a 2G. Everyone seems to have reasonably assumed the problem you were asking about was with your profile car.

So what is it.

 

[phillabaum03]

You can use a non-eprom from 95 or 96 in a 95 without changing anything.

Do you realize this is the first time you've said anything about a 2G. Everyone seems to have reasonably assumed the problem you were asking about was with your profile car.

So what is it.

damn dude, im sorry. I made a few threads hoping to find out whats wrong with it. Its a 95 gst. so 97-99 turbo ecus wont work?

 

[putinexim]

Did you ever get this fixed? I am having sort of the same issue (also in a 95). However mine is with injectors 2 & 3.