A few questions. My tuner is going over my swap. And we arent getting any power to the fuel injectors. Well we are unsure if there are getting power or not. Now what he said to me was this, If they are getting power, he has to go futher into it. Now I dont know excatly what that means, so what does it mean if the fuel injectors are getting power to them, where would one have to look from there.

 

go get some injector nodes, little lights that attach to your injector clips, if they blink your getting power. if you arnt getting any blinks, check your power to the resister, main relay, and ecu. i know in some 4th gens there is also a jumper connector that connects the yellow/black wire to the resister and relay, it looks like a regular electrical connector, but there is no wires going into it. make sure that jumper is in there.

 

j whatever is right. Ask for "noid lights"

That plug is one of the big plugs on the engine harness, it just doesn't have wires coming out of the other side.

 

Okay thanks for the speedo awnsers. Now heres where I get concerned. What if they are getting power? Reason being, I just swapped my h23 harness in for the h22 wire harness, and the injectors were good. But Im not using the h23 fuel injectors Im use the h22 injectors cause they are bigger, would this cause a problem? Even if they were hooked up wrong?

 

H22 injectors are interchangeable with h23. They just won't run exactly right, they're bigger. Vice versa for the other way around.

 

Wait would I need the map senor from the h22? I still have the one from the h23a1, which is so nicely located on the fire wall. DO I need the one for the h22

 

nah they're the same.

 

Shoot...So if they are firing and the engine still isnt getting fuel, where does it go from there? They cant go that much further. the fuel only has to go to the spark plug right?

 

i had the exact same problem swaping my h22a in my 92. took me 4 months to figure it out. (project car) well, first you do need to get a noid light, DONT USE A VOLT METER EVER, If you dont have power do what the other guy said, if you do let me know, its also good to know your fuel pressure. Let me know id like to help you with this, like i said i had the same problem and couldnt get any good help anywhere.

 

well my tuner is going over my work. I had it for a whole week and did the whole swap. So far the only thing i did was have 2 ecu pins in backwards. Im assuming it was the vtec pins. Everything else is good. except for this. The code reads no fuel. Now the pump works, the only thing off the top of my head would be a faulty resistor, which I swapped out the one I know works for the one Im unsure of. I swapped fuel rails as well. Im hoping its resistor.

 

just because i'm curious, take the ecu out and take the cover off. diagonal to the chip, there are 3 black rectangular blocks. These are the injector drivers, be sure these are clean and dont have any burn marks.

 

Ill def do that, but that tuner said he was using the P14 for this. I wasnt sure that a P14 can start a H22, but Im hopeing this guy knows what hes doing cause he is about to chip and tune my ecu.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelude72569858 &raquo;</TD></TR><TR><TD CLASS="quote">DONT USE A VOLT METER EVER</TD></TR></TABLE>

You can use a voltmeter, just make sure its set to AC first. The injectors get a square wave signal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Acidcrakker &raquo;</TD></TR><TR><TD CLASS="quote">Ill def do that, but that tuner said he was using the P14 for this. I wasnt sure that a P14 can start a H22, but Im hopeing this guy knows what hes doing cause he is about to chip and tune my ecu.</TD></TR></TABLE>

a p14 will start an h22 (pretty much any dohc obd1 will), but it wont run right until you get it chipped. and you wont have that mad vtek!!!

 

The fuel injector wire to ecu was ripped in half

 

How did you manage to do that?

 

IDK The wire must of been torn while ripping the motor out. Or just my pure brute strength

 

you guys are all smoking something...
AC?
right...in a DC electrical system...

with a DMM you can check for voltage at the injector pin thats powered. it should have battery voltage. the other pin is grounded by the PCM...this is where the noid lights come in. connect the noid light to the injector connector and crank the engine, watch for lights to flash. if it flashes, then everything from the PCM to the injector connector is good and you need to start looking for low fuel pressure, bad injectors (or...if you're trying to diag a misfire, you'd start looking at ignition and compression as well)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tsiah &raquo;</TD></TR><TR><TD CLASS="quote">you guys are all smoking something...
AC?
right...in a DC electrical system...

with a DMM you can check for voltage at the injector pin thats powered. it should have battery voltage. the other pin is grounded by the PCM...this is where the noid lights come in. connect the noid light to the injector connector and crank the engine, watch for lights to flash. if it flashes, then everything from the PCM to the injector connector is good and you need to start looking for low fuel pressure, bad injectors (or...if you're trying to diag a misfire, you'd start looking at ignition and compression as well)</TD></TR></TABLE>

No, I'm not smoking anything.

Edit: See below.


Modified by mgags7 at 3:58 PM 11/16/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">

When you switch DC 12v on and off to the injector at the frequency and duty cycle specified by the ECU, you come out with a square wave. That square wave is an AC signal.

It only gets power when it is time to fire the injector.

Next time, really think before you post.

There are other AC signals on your car as well. CYP, CKP, TDC sensors all send AC signals, the signal going to your ICM from the ECU is an AC signal, etc. You get the idea.</TD></TR></TABLE>

Well, technically, it's still DC. The current doesn't change flow direction.

And, the injectors have power applied to them all the time while the Main relay is energized. (for the first 2 seconds when the ignition is first turned on, and when the ECU receives input that the engine is turning) The ECU completes the circuit to ground to trigger them.


Modified by Perfectionist at 2:21 PM 11/16/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Perfectionist &raquo;</TD></TR><TR><TD CLASS="quote">

Well, technically, it's still DC. The current doesn't change flow direction.

And, the injectors have power applied to them all the time while the Main relay is energized. (for the first 2 seconds when the ignition is first turned on, and when the ECU receives input that the engine is turning) The ECU completes the circuit to ground to trigger them.


Modified by Perfectionist at 2:21 PM 11/16/2007</TD></TR></TABLE>

Ok, I was wrong, I just found out (from referencing the pic below), good call. Point is, if you wanted to read the waveform from both pins at the connector, you'd need an AC multimeter or an oscilloscope, otherwise you're just going to get the DC value (average) of the square wave.

Anyways, I admit defeat. (rare occurrence)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">

Ok, I was wrong,

]</TD></TR></TABLE>

Relax. I did say "technically". Switched DC does an awfully good job of replicating AC.

I should add, sensors that rely on a magnet passing a coil during the rotational travel does indeed produce an AC output signal.


Modified by Perfectionist at 4:58 PM 11/16/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Acidcrakker &raquo;</TD></TR><TR><TD CLASS="quote">A few questions. My tuner is going over my swap. And we arent getting any power to the fuel injectors. Well we are unsure if there are getting power or not. Now what he said to me was this, If they are getting power, he has to go futher into it. Now I dont know excatly what that means, so what does it mean if the fuel injectors are getting power to them, where would one have to look from there.

</TD></TR></TABLE>

no one has answered the original question yet.................
anyways................he meant if there is power to injectors and your car crank but not start then he has to go further into diagnosing to find out why your car crank but woundn't start.

injectors suppose to get BATTv with KOEO/KOER (key on engine off/key on engine running) if there aren't any power to them, I would first check the fuses under dash and hood then go from there.

to do this.............all you needed is a simple test light. you can also find out if your pcm firring the injectors or not with this test light.


Modified by ben_eg6 at 11:22 PM 11/16/2007


Modified by ben_eg6 at 11:24 PM 11/16/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ben_eg6 &raquo;</TD></TR><TR><TD CLASS="quote">

no one has answered the original question yet.................
anyways................he meant if there is power to injectors and your car crank but not start then he has to go further into diagnosing to find out why your car crank but woundn't start.

injectors suppose to get BATTv with KOEO/KOER (key on engine off/key on engine running) if there aren't any power to them, I would first check the fuses under dash and hood then go from there.

to do this.............all you needed is a simple test light. you can also find out if your pcm firring the injectors or not with this test light.


Modified by ben_eg6 at 11:22 PM 11/16/2007


Modified by ben_eg6 at 11:24 PM 11/16/2007</TD></TR></TABLE>