Join Date: Oct 1999
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HELP! I\'ve tried everything! or so it seems...
Ok, here's the story. One day I'm driving my '91 Samurai with the 1.3 EFI and all is well. Then next day when accelerating I suddenly lose all power, I put it to the floor and still nothing. I get slower and slower til I pull off the highway. As I'm coasting to a stop I hit the gas and away I go. All is well for about 15 miles, then it does it again. I can get up to a certain speed then if I let off and step back on it, NOTHING, no power, at all. If I let off the gas and get back in it, many times I can keep going. It doesn't idle well, sometimes to the point of stalling. It runs slightly better warm than cold.
It's fuel related I believe. I'll explain in a minute. I have replaced the fuel filter, the throttle position sensor, the MAP sensor, the plugs, wires, distributor cap. I've replaced the oxygen sensor, and added additional ground wires. I've replaced the timing belt and adjusted the valves. Vacuum is good, and electrically the fuel injection tests within spec.
Now, here's the odd thing. Before replacing the MAP I threw a MAP from an unknown chev in it. (just something laying around) The symptoms disappeared with the exception of the bad idle. It wouldn't idle at all. (I also had more power than I ever had!)
When I put in a good stock MAP I was right back where I started.
Could it be the fuel injection and with the MAP that ordered more fuel in it the injector was "fooled" ?
ANY ideas are greatly appreciated. Winter is here and I need my truck back !!