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| Idle surge problem; Idle surges with lights on | |
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| Tweet Topic Started: Oct 10 2017, 10:31 PM (875 Views) | |
| geogonfa | Oct 14 2017, 07:50 AM Post #16 |
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Just my .02¢...Even though it's been a year I still recommend the compression test... 1.) Remove the diode pack from the circuit and see if the ISC reacts the same when you turn on any accessories... 2.) Check the Alternator voltage and amperage, alternator could be exerting too much drag and computer is trying to compensate for it when it's under a load (low compression wouldn't help )... |
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| freegeo | Oct 14 2017, 09:08 AM Post #17 |
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| backyardmechanic93 | Oct 16 2017, 04:54 PM Post #18 |
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1. Will try removing it tonight and post results 2. How would I reduce the drag if that's the problem? Alternator and battery are about a year old (new water pump just installed due to growling bearing, idle still surging), tested charging system several weeks ago with vat 45, results were good. I was thinking the regulator might be the issue at first. Also, the revving/surging problem happened suddenly one day, it's not something that's slowly been getting worse. Edited by backyardmechanic93, Oct 16 2017, 04:57 PM.
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| backyardmechanic93 | Oct 17 2017, 06:05 PM Post #19 |
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Swapped out the TPS, problem solved. Thanks for the help/suggestions. |
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| freegeo | Oct 17 2017, 06:28 PM Post #20 |
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Glad you got it fixed. Usually a tps problem will effect idle also. |
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| backyardmechanic93 | Oct 17 2017, 10:42 PM Post #21 |
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I started with the most likely causes, then kinda just swapped things until it fixed it . It's odd because it seemed fine, I even tested the old tps with a multimeter too. Guess they only last 22 years. Now, all that's left is to get a tech 1 to set it properly.
Edited by backyardmechanic93, Oct 17 2017, 10:44 PM.
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| freegeo | Oct 17 2017, 11:07 PM Post #22 |
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You don't need a tech 1 to set it properly. Just a volt meter. Wish i knew you might be interested in a Tech 1, I just sold mine on ebay. |
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| backyardmechanic93 | Oct 18 2017, 11:59 AM Post #23 |
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Well, that would save a few bucks because I have a voltmeter. Any chance you'd be able to describe which pins to use for the adjustment? Pro-demand is telling me voltage needs to be checked with a tech 1 |
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| freegeo | Oct 18 2017, 01:09 PM Post #24 |
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The procedure is in the FSM. If someone else doesn't post it I will after I get off work. Edited by freegeo, Oct 18 2017, 01:09 PM.
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| suzukitom | Oct 18 2017, 01:58 PM Post #25 |
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Tom
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voltage measured using Terminal 1 (sensor ground) and Terminal 3 (Throttle Position input). Insert TPins into TPS connector so you can backprobe with your voltmeter on low voltage DC scale. (0-10V) Measure with 0.14 inch feeler gauge inserted between throttle stop and throttle valve screw. (9/64" drill bit equivalent diameter). ISC motor plunger tip must not be pressing against its stop. Voltage for properly adjusted TPS should be between 0.98 to 1.02 V with 0.14 inch feeler gauge inserted. Picture just shows my initial reading. ![]() Edit: my wire colors are different in this picture since I made a permanent extension harness from my TPS so I that I don't have to use TPins to check voltage. Edited by suzukitom, Oct 18 2017, 02:02 PM.
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. It's odd because it seemed fine, I even tested the old tps with a multimeter too. Guess they only last 22 years. Now, all that's left is to get a tech 1 to set it properly.

3:49 AM Jul 11