E.F.I. idle help needed! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 11-12-2002, 07:02 AM Thread Starter
 
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E.F.I. idle help needed!

Guys I am at my wit's end here & could really use some help from those with experience.
I am working on a friend's fuelie Samurai, and have it running pretty darned good - it is very strong through it's entire rpm range, easily reaching 70+ mph. The problem is with the idle - after it gets to operating temperature, the idle will drop down to 'normal' for just a couple seconds, then it will go back up to 'cold idle' for a couple seconds, then back to warm idle, then back to cold idle - man, it's just like Clockwork, too. Something in the system is switching it back & forth. The ONLY thing I have discovered is that if I disconnect the vacuum line going to the MAP sensor & plug the intake off, it purrs like a kitten at warm idle. The rig does not give any trouble codes - only 1 2 = normal. A couple times, it went to normal warm idle after I had removed the diagnostic fuse??

ANY help on this would be GREATLY APPRECIATED!! [img]images/graemlins/crazy.gif[/img]
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post #2 of (permalink) Old 11-12-2002, 09:04 AM
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Re: E.F.I. idle help needed!

Mine was doing the same thing.
This is what I did. Go to
http://pub18.bravenet.com/forum/fetc...num=1541262810
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post #3 of (permalink) Old 11-12-2002, 09:27 AM Thread Starter
 
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Re: E.F.I. idle help needed!

So you tried this:

There is a plate with three screws on the front passenger side of the throttle body. With engine off, remove the 3 screws & plate.

There is a threaded washer inside of the hole with ~three little bumps on it as I recall. Use a flat screwdriver and turn this threaded washer clockwise about one half turn. Replace the cover and the screws and start her up. If it still surges, do same procedure again. Mine took a full turn.


I will defenitely give this a try & see what happens.


Thankya......thankyavrymuch [img]images/graemlins/wink.gif[/img]




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post #4 of (permalink) Old 11-12-2002, 09:39 AM
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Re: E.F.I. idle help needed!

So far, I have had the opportunity to do this to four different 1300 efi zukes.
It worked great on all of them.
They each required different amounts of adjustment.
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post #5 of (permalink) Old 11-12-2002, 09:49 AM Thread Starter
 
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Re: E.F.I. idle help needed!

Please excuse my skepticism (it just sounds too easy to work [img]images/graemlins/wink.gif[/img]) But how did you come to this solution? Is this adjustment anywhere in the factory service manual?
Just curious - I hope it WORKS!

Thanks again,

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post #6 of (permalink) Old 11-12-2002, 09:59 AM
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Re: E.F.I. idle help needed!

If the problem that you are having is the same as the 4 that I fixed, it should work.
This problem was discussed on one of the bbs' many months ago.
I can't remember which one.
I seem to remember something about this fix having to do with air and some type of wax regulator that eventually goes out of adjustment.
If you have tried everything else and havn't fixed it, this might be worth a try.
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post #7 of (permalink) Old 11-12-2002, 10:03 AM
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Re: E.F.I. idle help needed!

Hey OILBURNER,
Check your PMs
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post #8 of (permalink) Old 11-12-2002, 10:54 AM
 
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Re: E.F.I. idle help needed!

Hi Burner, it is a typical air leak issue. My first advice would be to replace all the vacuum lines - they cost pennies p/foot and most likely are due to the replacement anyway due to their age. Same goes for the PVC valve. In 99.99% cases it will fix the problem. EFI engines are VERY sensitive for air leaks.

Now for the boring explanation: what happens is that the engine receives "foreign" air from the leak. ECU is trying to compensate for it by closing the air bypass valve. The RPM drop, therefore the leak is instantly reduced down to almost nothing. The RPM keeps dropping because it's air-starved, so the ECU thinks: Aha! I need more air! and opens the bypass valve. RPM rise to the pre-set (850 or so RPM) value but again, that re-activates the leak....loop closes here. The thing is, that it takes a second or so to cycle the bypass valve, thus the "clockwork" effect.

You can try the AK's advice too and it will kinda work too, but (with all respect) it's more of bypassing the problem than fixing it.

Please let us know if it helped.
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post #9 of (permalink) Old 11-12-2002, 10:58 AM Thread Starter
 
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Re: E.F.I. idle help needed!

I'm all over it [img]images/graemlins/wink.gif[/img]

I will let everyone know what happens.



BTW, a search with "surge" found all of the earlier posts on this topic.
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post #10 of (permalink) Old 11-12-2002, 04:44 PM
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Re: E.F.I. idle help needed!

oilburner, that should fix your problem, it did for me twice. I read it somewhere and it explained how it worked, dont remember the details but it made sense at the time.
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