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Old 09-30-2007, 07:15 PM   #1
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Default Surging Idle

I know this problem has been beat to death but this question is a little different.

When I bought the truck 2 years back the previous owner (clamined to be an electrical engineer, but I am beginning to wonder) did a bad job wiring in a 96 OBDII 4.0 and computer into an 88 ranger... I have been fixing his problems and I have all but fixed the truck, now all that's left is the surging idle, the 96 harness calls for dual O2 sensors, but the 88 exhaust only had 1 bung, so he just hooked up the front O2 and let the pigtail for the second hang there. Could this cause the surging idle? I know Mike will most likley have a good answer on this one.
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Old 09-30-2007, 07:23 PM   #2
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Does it do it cold and hot?
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Old 09-30-2007, 07:37 PM   #3
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yep doesn't matter what the temp.
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Old 10-01-2007, 05:27 AM   #4
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Originally Posted by samsonitesamsonite View Post
yep doesn't matter what the temp.

If it does it cold, then it's not the O2 sensors. The O2 sensors are only used in "closed loop". I suspect the IAC valve, or the TPS. While at idle, measure the signal lead on the TPS, it should be < 900mV.
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Old 10-01-2007, 08:28 AM   #5
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Had a surging idle problem once in my B2; it was the fuel pressure regulator. Just another easy thing to check.
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Old 10-01-2007, 08:39 AM   #6
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I have a similar problem to figure out so I was wondering what an IAC is?
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Old 10-01-2007, 08:47 AM   #7
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I have a similar problem to figure out so I was wondering what an IAC is?

Idle Air Control valve. Here is a picture of it (on a 3.0L), it will be located just behind the throttle body on a 4.0L:

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Old 10-01-2007, 11:37 AM   #8
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I really dont mean to steal this thread but this mite help. How do I test to see if the IAC is bad or maybe the TPS?
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Old 10-01-2007, 07:10 PM   #9
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I replaced my IAC and TPS. It also idles a little 'rough at times'

another question that may or may not be related to this... would an exhaust leak, right after the cat, cause the engine to run poorly?
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Old 10-01-2007, 07:25 PM   #10
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After the cat? I doubt it. It might set a MIL for an OBD-II vehicle, since there is a downstream oxygen sensor. But that sensor will say that the cat isn't working (it's not used in managing the engine).

It will also cause rust and rather embarrassing noises, so you really do want to fix it.
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