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Discussion Starter #1
My 85 4runner is running very very very rich, black smoke pores out of the tail pipe if you hit the gas. I am thinking there is just WAY to much gas going into the engine. I tried swapping the fuel pressure regulator along with countless other things. Does anyone know a way to check the fuel pressure? I know in the factory service manual it shows screwing a special service tool into the fuel rail, but I have no idea how to get one of those, the dealerships don't seem to sell them. I know that my cold start injector isn't the problem, I both disconnected the wiring connector and blocked off the fuel that goes to it. It's also idling very low, if I adjust the idle screw all the way out it idles at 100-200 rpms. I was thinking this could be related to it running so rich, maybe the gas to air mixture is just to great? I know my timing is dead on, and I have new plugs, wires, cap, and rotor. My fuel injectors were flow tested and cleaned by rc engineering. I also tryed switching ECUs so I know thats not the problem. Could it be a possibility that the fuel injectors are pumping gas in all the time? What would cause that....I'm pretty much looking for any ideas or suggestions anyone has....
 

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Discussion Starter #3
Yup, I checked and adjusted the TPS, it appears to be working properly....
 

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Did you check for codes? Might suspect a bad O2 sensor. Other than that, could be the MAS. It sounds like something is telling the ECU it is getting more air than it actually is. One more really stupid thing...Make sure your air intake is not plugged, and I mean ahead of the air filter....
 

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Discussion Starter #5
Originally posted by 4wheeldog:
<STRONG>Did you check for codes? Might suspect a bad O2 sensor. Other than that, could be the MAS. It sounds like something is telling the ECU it is getting more air than it actually is. One more really stupid thing...Make sure your air intake is not plugged, and I mean ahead of the air filter....</STRONG>
There are no codes. I don't think that the 02 sensor could compinsate for this much gas, I mean there is gas poring into the engine, I think that the 02 could change the mixture a little bit, but not very drastically, am I correct to assume this? I have tried changing the Mass Air Flow sensor, didn't change how it runs. The intake is not plugged. Any more ideas?
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I'd bet the farm it's a shorted injector. Pull the connectors and check the resistance. They're wired in pairs so if 1 is bad, 2 will dump fuel.
 

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Discussion Starter #7
All the injetors seem to be firing correctly, I held a sound scope up to them all and they all made the normal clicking noise, if one was shorted, I don't think it would click....
 
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