need help-fuel to rail but injectors are not pulsing

[willyb22]

Hey Guys,

I've searched the forums and nothing anserwed my questions or solved my problem. I recently had to have the head rebuilt after a timing belt breakage on the highway. Well anyways we put the engine together and I have fuel to the rail but not the injectors. Its not the injectors because I manualy pulsed the injectors with a jumper wire and fuel came out and I checked my injector wires and I am getting the proper signals from all four. Im completely stumped and could really use you guys help. Thanks.

Will B

 

[fatherbubble]

So your fuel pump is pumping at 43.5lbs an no fuel is getting to the rail. Did you check the rail for stuff stuck in it? Also did you check to make sure the head was cleaned out. You might have the injector ports cloged up on it or something in the intake side. But I really bet you dont have enough fuel pressure. It sounds as if your injectors are firing fuel in there an eather the fuel is burring up before it gets to the cylinders or the fuel cant get to it.

 

[willyb22]

I have fuel to the rail just the injectors aren't pulsating. The head was redone by a machine shop and was cleaned. The injectors are not clogged because I could pulse them with a jumper wire.

 

[gordy3683]

did you make sure you hooked up your crank angle sensor? also "When the ignition switch on signal is input, the engine control unit energizes the control relay coil L3 to turn on the S2 switch, thus supplying power to the injectors" check the control relay

 

[willyb22]

I checked the relay and it was fine. Thats the thing, I'm getting the right signals from everything I check. It doesn't make sense, if everything is working why am I not getting Pulses to the injectors? And the cam sensor was replaced so that couldn't be the problem. If you think of anything else, please let me know, thanks.

 

[Nekoni]

Holy crap, that's a new one on me. Getting proper signal going to the injector AND the injectors work manually. What voltage and wattage are you reading; I mean are you sure it's correct? If it is, I'd stop asking here and consult a Priest about this.

 

[willyb22]

I was getting power through the injector wires but now I'm not. My injectors are reading 14.5 and the spec. is 13.0-16.0. My relay is still checking out and also the ECM. The CAS is fine and the only code I'm getting is for the coolant temp. sensor.

 

[steve]

the only code I'm getting is for the coolant temp. sensor.

That's enough to keep the car from starting, not because you not getting any fuel but because your drowning it.

I'm worried that your poking around may have created a new problem if your not seeing power to the injectors now.

Pull the plugs and see if they are wet. Make sure you have spark. If the plugs were wet get a fresh set and fix the ECT sensor.

 

[steve]

Im not an idiot and I'd appreciate it if you showed some respect.

I beg your forgiveness. I was not implying your an idiot.
Good luck with your diagnostics.

 

[willyb22]

I apologize for my words. I guess I misunderstood what you were saying.

 

[fatherbubble]

Cool peace is made. Lets go have a beer!! And drown on this problem.

 

[gordy3683]

I checked the relay and it was fine. Thats the thing, I'm getting the right signals from everything I check. It doesn't make sense, if everything is working why am I not getting Pulses to the injectors? And the cam sensor was replaced so that couldn't be the problem. If you think of anything else, please let me know, thanks.

ok thats fine. but like i said did you check your CRANK angle sensor? "The crank angle sensor is mounted on the cylinder head and is directly coupled to the intake camshaft."

 

[steve]

ok thats fine. but like i said did you check your CRANK angle sensor? "The crank angle sensor is mounted on the cylinder head and is directly coupled to the intake camshaft."

On a 1G the CAS on the rear of the intake cam provides both Crank and Cam timing information to the ECU. He says it's fine.

 

[gordy3683]

my bad if im mistaken i was going off of what the manual states thats y i had it in quotes

 

[willyb22]

I was wondering, if the ecm is bad, would it still give me trouble codes?

 

[DroopYeyeS]

If you pull the CAS and turn the rotor on it manually, with the ignition on, it should fire both; the plugs and pulse the injectors. If either, or both do not happen, it's time to pull the ecm and check the caps. Odds are the ecm is bad. Good luck on this one. Also, yes a bad ecm can still put out codes.

 

[steve]

I was wondering, if the ecm is bad, would it still give me trouble codes?

There are varying degrees of bad. From having problem to dead. Many ECUs that won't start the car still are alive enough to output DTC's

Most of us need more input than "I'm getting the right signals from everything I check." to know what's going on and do anything more than guess. More like "My injectors are reading 14.5 and the spec. is 13.0-16.0." but including where the measurement was made (pin and wire color), the conditions (ignition on but not cranking), and the units (I assume volts). I also don't know what to make of conflicting information like "I was getting power through the injector wires but now I'm not" followed up by "My injectors are reading 14.5 and the spec. is 13.0-16.0". Which is it?

When you checked the CAS for example, what did you check, what signals did you get, How and where did you measure them.

Just pulling the CAS and turning it by hand while measuring the voltages on it's two signal lines, the injector, and PTM pins at the ECU will tell us a lot about that's going on like DroopYeyeS said.

 

[RedEvil]

If I were you I would check that Ect code first. The Ect is one of the high authority sensors that the computer looks at to determine pulse width and fuel trim! After that I would do a noid test to check if in fact the computer is pulsing the injectors. As you probably know the injectors have to put out a certain amount of fuel. I think the rule of thumb is 1 Pint in 15 seconds. Check the injectors for volume!.

 

[Nekoni]

If I were you I would check that Ect code first. The Ect is one of the high authority sensors that the computer looks at to determine pulse width and fuel trim! After that I would do a noid test to check if in fact the computer is pulsing the injectors. As you probably know the injectors have to put out a certain amount of fuel. I think the rule of thumb is 1 Pint in 15 seconds. Check the injectors for volume!.

The only thing is, even if the ect was completely disconnected or reading way off, he should still be getting power through the injector harness.

 

[willyb22]

Steve, I told you before, I don't guess. I look to everybody here for help just like everybody else on this site but you insist on being a wise ass. If you would read carefully and not assume things you would realize that what I said was not conflicting. The statement "I was getting power through the injector wires but now I'm not" refers to the wires on the harness side and "My injectors are reading 14.5 and the spec. is 13.0-16.0" refers to the injector itself. And when I say I'm getting the right signals doesn't mean that I stand over the engine compartment tapping on stuff and scratching my head. I guess you let that term wiseman get to your head.

 

[steve]

Steve, I told you before, I don't guess. I look to everybody here for help just like everybody else on this site but you insist on being a wise ass. If you would read carefully and not assume things you would realize that what I said was not conflicting. The statement "I was getting power through the injector wires but now I'm not" refers to the wires on the harness side and "My injectors are reading 14.5 and the spec. is 13.0-16.0" refers to the injector itself. And when I say I'm getting the right signals doesn't mean that I stand over the engine compartment tapping on stuff and scratching my head. I guess you let that term wiseman get to your head.

This is the second time you've gone off and been rude to me, I won't be apologizing for whatever your personal problem is this time.

Try not to let your attitude get in the way of understanding what I'm asking from you. So when I say I would like you to be specific about how you measure what your reporting I'm not doing it to be a wise ass or make you look bad, I'm doing it because it makes a difference.

Since this really seems to be difficult for you to accept, I'll make it easy on both of us and leave you to figure it out. Clearly you do need or want my input and that's fine. I hope you figure it out. I'll be happy to unsubscribe and share my time with someone who values it.