injectors not pulsing

[JAU663]

I have been working on this drift truck's engine, a ca18det, but can't get it to start. The injectors will not pulse, they are getting fuel to the top but not thru to the bottom. There is a pulse on the test light, but not enough to pulse a noid light. I have traced all the wires to and from the ECU and also tested the cam angle sensor, throttle position sensor, changed out injectors, changed out the ECU, and wire harness, etc. If someone could give me some help I would appreciate it.Thanks,John
Modified by JAU663 at 5:47 PM 11/1/2007

[TD or Not TD]

check the injector resistor. thats what my problem was, it didnt have power going to it(the center wire of the 5 wires connected) basically one power in and then 4 out to the injectors. i just stuck it with a test light and put a power wire to the test light and boom instant fuel.

[float_6969]

Or check for 12VDC + at the solid colored wire at the injector. If you don't have that when the key is in the run position, check for 12VDC + at the resistor pack. If you've got power there, see if you've got power coming out of it. (See post above).

I'll bet you don't have power going to the resistor pack.

[JAU663]

What purpose does the dropping resistor serve? I bypassed them and walla pulsing injectors But... evidently something is screwed up with the timing cuz it still won't run.Thanks guys for your help John

[TD or Not TD]

i would deffinately keep the resistor wired in, or some damage can be done. make sure all your connectors are secure. check and make sure your engine is grounded well.

[The_Chosen_One]

You bypassed the resistor, congratulations your gonna burn up your ecu's injector drivers which means your **** isnt gonna run. Stop messing with the car if you have no idea what your doing.

[float_6969]

Dude, I really hope you didn't bypass the dropping resistor. That is VITAL for the life of the ECU. If you did bypass it, you just toasted the injector drivers in the ECU.

It's purpose is to increase the impedance on the injector circut so that smaller and faster acting drivers can be used in the ECU.

Dropping resistor = good thing.

[eds13]

well do you have any extra dropping resisters laying around?

i fortunatly have an extra ecu, sucks that ones blown now.....

[JAU663]

Just to clarify... This wire harness, ecu, dropping resistor, etc runs flawlessly in another CA car.

There is also 12v to the top of the injector... as i have traced and specked all the wiring / components on the fuel system and most of the other engine wiring/components. When I took an old injector (for testing purposes) before the resistors it pulsed fine, but after the resistors it would do nothing.

In my defense . . . I have been doing mechanical work for a very long time. . . (probably before most of you where around or in diapers) I just got stuck - so I was asking for help so I can continue my learning and keep my mind open.

[float_6969]

Well it sounds to me like you just verified that the dropping resistor is bad.

Replace it and it should work. You can rewire one from a DSM to work. There is a how-to in the stickies.

[JAU663]

Me again,Replaced the dropping resistors...now I have gas. Changed out the timing belt and place perfectly in time. She fires sometimes but will not run. I will take suggestions on what to do next. ThanksJohn

[keith0486]

man i wish i knew ca's only for the fact i wanna see this thing running.

sorry i cant help you but im sure some one on here must know what you can do to get it to run.

[dattodude]

Could be faulty CAS, a lot of people complain of them. The CAS is what drives the spark. Do you get some timing light flashes during cranking?

Have you wired up 12v to coils and ECU both during start and ign position? This is another common transplant mistake.

Still got good compression after timing belt change?

[nismoplsr]

Quick question. Are the injectors stock?

[rovert]

As far as the injectors not getting fuel through them...

JOIN THE CLUB!!!!!!!!!!! Somebody needs to sticky the remidy, You wont believe how many people on here, and other forums, have this same problem. I have spark, fuel, dropping resistor, timing but no damn fuel is getting into the cylinders!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[JAU663]

Thanks for the input!Timing rightcompressiongas to cylindersstock injectorsCAS replaced with good one (off of running CA)need to check on the 12v to coils during start and ign (even though using CA wire harness and ecu that worked well in other CA car)Car acts like it is getting WAAAYYYY to much fuel. (injectors are pulsing not spraying constant)Thanks,John

P.S. Bring back Special

[boost_boy]

As far as the injectors not getting fuel through them...

JOIN THE CLUB!!!!!!!!!!! Somebody needs to sticky the remidy, You wont believe how many people on here, and other forums, have this same problem. I have spark, fuel, dropping resistor, timing but no damn fuel is getting into the cylinders!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

ALot of times it just reverts back to a bad wiring job and there's no sticky to prevent that. There's just waaaaaaaayy too much information on this forum that people don't take the time to review. I sit back and watch members crash and burn because most know everything else but how to wire-up a CA18DET install. But in your case, if your are sure you've done everything correctly, start looking at another ecu. Those get damage or already damaged before you take ownership, so it's hard to blame anyone but the bad ecu itself.

Dee

[rovert]

T

ALot of times it just reverts back to a bad wiring job and there's no sticky to prevent that. There's just waaaaaaaayy too much information on this forum that people don't take the time to review. I sit back and watch members crash and burn because most know everything else but how to wire-up a CA18DET install. But in your case, if your are sure you've done everything correctly, start looking at another ecu. Those get damage or already damaged before you take ownership, so it's hard to blame anyone but the bad ecu itself.

Dee

True that.

[dattodude]

dude, when you say 'another CA car?' you do mean DET?

I tried to run my DE with a DET ECU back in the early nineties, and it just wouldn't keep running. Sounded like 2 cylinders and needed throttle to keep it running. I got a DE computer and like magic it ran like a dream.

I don't know anything about 'plug and play' KA->CA conversions. I have wired several CA18de/t installs from scratch using all sorts of junkyard bits and pieces.

I'd be checking 12v to the CAS...wouldn't be the first time..

Bad ECUs are caused by bad wiring. If you don't know where every wire is going, (which hopefully you do) then we all wouldn't be discussing this while standing ankle deep in horse manure.

I'm happy to direct you to any information you need to sort this out.

EDIT: Way too much fuel...will mean you really could be running a DE ECU..

For idle test purposes, you could switch out to DE (RED) injectors (also bypass the dropping resistors) and see if it idles.

[float_6969]

Wait, is this a FWD, car?

[boost_boy]

Wait, is this a FWD, car?

They put the CA in p/up truck.

Dee