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post #1 of (permalink) Old 12-16-2004, 08:41 PM Thread Starter
Riz
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HELP! I\'ve tried everything! or so it seems...

HELP!

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 !!

THANKS !
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post #2 of (permalink) Old 12-17-2004, 12:27 PM Thread Starter
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Re: HELP! EFI driveability problem

Anyone have ANY trouble shooting ideas on this one? THANKS!
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post #3 of (permalink) Old 12-17-2004, 02:56 PM
 
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Re: HELP! EFI driveability problem

Im guessing when you changed the timing belt, you checked the timing? have you tried the comp reset button?
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post #4 of (permalink) Old 12-17-2004, 03:56 PM
 
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Re: HELP! EFI driveability problem

A bad or Clogged Catalytic Converter Can Cause such Catastrophies and Conundrums
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post #5 of (permalink) Old 12-17-2004, 04:07 PM Thread Starter
Riz
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Re: HELP! EFI driveability problem

Comp reset button?! Ummm...no I haven't. Can you give me a little more info?

I checked that cat conv. and it seemed to be flowing fine, but you just never know I guess. Maybe I'll try a little drive without and see what happens.
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post #6 of (permalink) Old 12-19-2004, 02:11 AM
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Re: HELP! EFI driveability problem

SOUNDS LIKE BAD GROUNDS!!!!
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post #7 of (permalink) Old 12-24-2004, 09:54 PM
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Re: HELP! EFI driveability problem

Bad grounds. Thats what it is. dont check them. CLEAN and tighten them, all of them. Get some nolox (dielectric) grease and put on them. Mine did the same thing and i traced it to a ground at the tstat. Now i have 1/0 welding wire for batt. cables and #1 for batt. to body and body to motor and frame. Havent had a problem since and that was 2 years ago.

Hope this helps.
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post #8 of (permalink) Old 12-27-2004, 08:54 AM
 
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Re: HELP! I\'ve tried everything! or so it seems...

Check your O2 sensor, my 88 did the same thing when the O2 sensor went out,

not sure what the difference would be with the fuel injection, but I'll bet they used the same setup for the feedback on the O2 sensor.

hope this helps
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