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post #1 of (permalink) Old 11-13-2002, 09:19 AM Thread Starter
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EFI Injector help

When I picked up my 1991 EFI Sammy, the injector was not putting out fuel. I did all the normal checks, Fuel pump, lines, etc...
Turns out there was no power at anu time to the injector.
I cut the wire that goes from the ECM to the injector , and ran a wire from the injector to a fuse that is controlled by the ignition switch.
This machine runs like a raped ape. I really don't know what this has done to fuel mileage because I only run it off-road, although I have road-tested it.

My question is,--- Am I harming anything, This is bypassing the ECM.
Yes, the check engine light is on. Since this bypasses the ECM, why does the injector still know how much fuel to put out? The engine runs well at all rpm's.
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post #2 of (permalink) Old 11-13-2002, 02:32 PM Thread Starter
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Re: EFI Injector help

btt
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post #3 of (permalink) Old 11-13-2002, 03:06 PM
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Re: EFI Injector help

I had a similar situation with my 91. The injector wasn't putting out fuel. It turned out to be the ECM. If this is the case, I believe there are several sources for rebuilt ECM's, one being Petroworks....
If for any reason it's your injector, I have a spare one that you can have (free) as they are really pricey to replace..........
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post #4 of (permalink) Old 11-13-2002, 03:27 PM
 
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Re: EFI Injector help

i can't beleive it runs that way!!!!! [img]images/graemlins/grin.gif[/img]
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post #5 of (permalink) Old 11-13-2002, 03:53 PM
 
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Re: EFI Injector help

I think the injector is running full blast when ever the key is in the on position. You should be able to hear it buzzing. I'll bet it runs rich, very rich, especially at slow speeds.
Direct wiring the injector might be a good way to get a vehicle with ECM damage back out of the woods to civilization.
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post #6 of (permalink) Old 11-13-2002, 05:08 PM
 
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Re: EFI Injector help

Oh boy, you're hosing down your engine's throat with gasoline.... It will harm mostly your pocket [img]images/graemlins/smile.gif[/img] but in the long run you might end up seizing a piston or two due to all the excess gas washing down the oil film off of the cylinder walls.

What surprizes me the most is that the whole thing runs 2 begin with. U live, u learn I suppose [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img]

Anyway, try to check the original injector feed wire for continuity, check the ECU plug, fuses and all the obvious. Often it's a loose connection somewhere.

HIH
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post #7 of (permalink) Old 11-13-2002, 05:12 PM Thread Starter
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Re: EFI Injector help

The crazy thing about it all is that the injector doesn't buzz, or seem to inject any fuel into the TB when the key is on.
It does when the engine is running. It does not appear to be running rich---The plugs look nice and clean. Power is as expected of a 1300cc at all rpm's.
I don't like running it like this, and am in the process of changing all the caps in my ECM. When I get that done, I'll hook it back up correctly and see if it works.

Idle is very good and stable at about 6-700rpm.
I have driven it about 1000 hard trail miles since I hooked it up like this.
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post #8 of (permalink) Old 11-14-2002, 06:25 PM
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Re: EFI Injector help

I don't know how Suzuki FI is wired ( haven't put FI on my '87 yet )but I know that on my Bronko, Ford runs power to the injectors from the ECM and then the ECM grounds the injector at the ECM, so the B+ is constant and the ground is pulsed. This would be why your engine runs normal.
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post #9 of (permalink) Old 11-14-2002, 06:49 PM Thread Starter
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Re: EFI Injector help

That sounds like a favorable theory.
I like it.
That would mean that the circuit on the ECM that runs the hot lead to the injector is shot. Might be the plug at the ECM. Can't be the wire because I spliced into it at the ECM.
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