dotis Posted February 14, 2007 Share Posted February 14, 2007 Just picked up a 1986 Comanche 2x4 2.5 liter 5 speed, never seen rust super solid. It's been sitting for a year, it won't run, but if you pour gas in the intake, it runs very nicely starts right up and will run nice as long as you keep dribbling gas in it. So I've determined it is probably NOT the ECM as I have spark, and shift indicator light on the dash. I have a wiring diagram, but can find no real good troubleshooting info. I guess it probably wouldn't be the speed sensor if I had spark? Injector? where should I start? Any help would be appreciated. Link to comment Share on other sites More sharing options...
Eagle Posted February 14, 2007 Share Posted February 14, 2007 Your '86 has throttle body injection. I hope the problem isn't the injector, because that's a $200+ replacement. What about the fuel pump? Have you verified that it's delivering enough fuel and enough pressure to the injector? That's where I would start. PLus you have a fuel filter in the line from the tank to the engine. It's mounted to the inside of the driver's side frame rail, near the fuel tank. That could be clogged. Perhaps you should start by changing that, since it's probably long overdue anyway. Link to comment Share on other sites More sharing options...
feerocknok Posted February 14, 2007 Share Posted February 14, 2007 Disconnect the fuel line behind the throttle body and put it into a gatorade bottle. Turn the key on. If there's gas going into the bottle, it's your injector. If not, it's your pump, filter, or clogged lines. Or no gas... Link to comment Share on other sites More sharing options...
dotis Posted February 14, 2007 Author Share Posted February 14, 2007 Thanks for the info, I already checked the fuel delivery to the injector, and changed the fuel filter, so I guess it's probably the injector? Link to comment Share on other sites More sharing options...
Eagle Posted February 15, 2007 Share Posted February 15, 2007 Next check to see if the injector is receiving an electrical signal. You can buy the tester for about $15 at any of the parts houses, it's called a "Noid Light." They don't list it for the Jeep, but one of the other makes fits. Don't remember now, I think it was listed for a GM. Link to comment Share on other sites More sharing options...
feerocknok Posted February 15, 2007 Share Posted February 15, 2007 Next check to see if the injector is receiving an electrical signal. You can buy the tester for about $15 at any of the parts houses, it's called a "Noid Light." They don't list it for the Jeep, but one of the other makes fits. Don't remember now, I think it was listed for a GM. I've never heard of this. Can you explain? I figured one of those ohm/amp dealies would do it. Link to comment Share on other sites More sharing options...
Eagle Posted February 15, 2007 Share Posted February 15, 2007 A noid light is the tester for checking the wiring to injectors. Basically you take the connector off the injector, plug it onto the noid light, have a helper crank the engine over, and see if the light flashes. Link to comment Share on other sites More sharing options...
carnuck Posted February 15, 2007 Share Posted February 15, 2007 Caddy TBI uses the same noid light. I have the whole set. Link to comment Share on other sites More sharing options...
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