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Post by jeep318 on Nov 24, 2017 18:29:11 GMT -5
Yes there is a way I did it and made my own harness i hot wires all the stuff I needed and when I was done I can start and shut the car off from under the hood you don't need anything under the dash
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Post by taterjuice on Nov 25, 2017 0:48:23 GMT -5
I have a 99 Monte Carlo with a 3.1. The security light is not flashing. And it runs perfect on starter fluid. The fuel pump is not running. So I hotwired it. But it still don't run, it seems as though the injectors are not firing. Is there any way to hotwire the computer to bypass everything and eliminate the possibility of the security being the issue. Or is there another obvious common problem that I am missing. Sounds like a bad fuel pump to me, not a security issue. 
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Post by STROMI 121 on Nov 25, 2017 8:06:57 GMT -5
Has pressure at the rail. Not sure how much but I took the pump out of a running car.
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Post by racer35 on Nov 25, 2017 16:15:52 GMT -5
I have a 99 Monte Carlo with a 3.1. The security light is not flashing. And it runs perfect on starter fluid. The fuel pump is not running. So I hotwired it. But it still don't run, it seems as though the injectors are not firing. Is there any way to hotwire the computer to bypass everything and eliminate the possibility of the security being the issue. Or is there another obvious common problem that I am missing. cam sensor conrols injectors, might be worth looking into
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Post by smashbob12 on Nov 26, 2017 0:35:34 GMT -5
Has pressure at the rail. Not sure how much but I took the pump out of a running car. Not to be an Ass as I am GUILTY of it. But any chance your feed & return lines reversed ??
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Post by STROMI 121 on Nov 26, 2017 0:48:12 GMT -5
Nope. Sure of that as the sending unit is maked. F & R. I can use a jumper wire across the fuel pump relay and get plenty of pressure. The problem is that the car doesn't tell the pump to run or the injections to fire. Im convicted at this point the computer is bad or there is a short somewhere. I have checked all the fuses and relays several times. My conclusion although may be wrong is that if it runs off starting fluid the ignition module, coil packs, and crank sensor are working. I unplugged the cam sensor on another running car I have and the car kept running. I know allot about cars as it is my profession. But I don't claim to be an expert on electronics.
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boom61
Feature Winner
Posts: 1,666
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Post by boom61 on Nov 26, 2017 1:27:50 GMT -5
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Post by marked on Nov 26, 2017 1:55:58 GMT -5
Check fuel pressure at the rail. Pump is probably bad. Or start checking grounds. Sorry I'm a carb guy but that's my 3 cents lol.
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Post by marked on Nov 26, 2017 2:12:20 GMT -5
Could also be crank sensor or icm. Sorry if that's already been mentioned or you've already eliminated that.
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Post by smashbob12 on Nov 26, 2017 11:21:56 GMT -5
I have a 99 Monte Carlo with a 3.1. The security light is not flashing. And it runs perfect on starter fluid. The fuel pump is not running. So I hotwired it. But it still don't run, it seems as though the injectors are not firing. Is there any way to hotwire the computer to bypass everything and eliminate the possibility of the security being the issue. Or is there another obvious common problem that I am missing. You said 3.1 , By any chance has it been swapped from a 3100 to a flat top 3.1 ? if so that could be a eng/ecm compatability issue.
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Post by STROMI 121 on Nov 26, 2017 11:46:09 GMT -5
It's a 3100. It acts like a security issue. But the security light comes on for a second or three and then goes out like it's supposed to when you turn the key on.
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Post by superM on Nov 26, 2017 16:11:44 GMT -5
Have you checked with a noid light at injectors to see if you have power there?
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mn13
Heat Winner
Posts: 231
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Post by mn13 on Nov 26, 2017 18:44:40 GMT -5
I have a 99 Monte Carlo with a 3.1. The security light is not flashing. And it runs perfect on starter fluid. The fuel pump is not running. So I hotwired it. But it still don't run, it seems as though the injectors are not firing. Is there any way to hotwire the computer to bypass everything and eliminate the possibility of the security being the issue. Or is there another obvious common problem that I am missing. stated that it doesnt run. Does it fire at all or just crank? If it fires and dies after a couple seconds look into anti theft Check for power to the injectors, one wire should have power any time the key is on the other will be a pulsed ground by the pcm. If there is power then check for the pulse, best way is a noid light, otherwise an led test light should work no pulse either anti theft, although usually when I see problems with them they will fire and run a couple seconds, or bad wiring/pcm this is what comes to mind right off the top of my head and usually gets one running for me
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Post by STROMI 121 on Nov 26, 2017 18:53:30 GMT -5
It ran for two minutes until I ran through a whole can of starting fluid. It will not run at all own its own. I will check the injectors tomorrow
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Post by taterjuice on Nov 26, 2017 20:44:44 GMT -5
It ran for two minutes until I ran through a whole can of starting fluid. It will not run at all own its own. I will check the injectors tomorrow Check for injector pulse. I'm assuming your running a fuel filter too, 12 volt should be present with key switch on, ground is actually what triggers the injectors. So check 1 side, with test light grounded for voltage, then if voltage is present hook both ends of test light to the injector, and crank engine over. Should flash like a strobe light is it's got pulse. Another possibility if you do have pulse but doesn't run is injectors are gummed up and clogged. I've only seen this once, on a tbi motor, and after it ran for a bit on starting sauce they eventually started spraying once more.
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