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97 idle fluctuation

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Old 05-18-2012, 08:58 AM   #1
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97 idle fluctuation

So.... I have been working on ressurecting a 97 tacoma with a 3RZ. It has 93k on the ticker. This truck was parked on the wrong side of town and suffered a bullet through the intake plenum and valve cover as well as the wire harness, which melted at the impact point. To this point I have replaced the harness, valve cover, intake and some relays. I can now get the truck to start and run but my main problem right now is the idle fluctuates high to low to high in a continuous cycle. temp does not effect the idle issue, It does it when its cool and warm. The little valve that pushes controls the throtle pushes it in and out. I have checked all the hoses and cleaned the TB but it doesnt help. The coolant is topped off, it has new oil and filter, cap and rotor. I also checked the TPs which seems to be working fine.
What do you think I should try troubleshooting next?
Any help is appreciated. Thanks
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Old 05-18-2012, 09:12 AM   #2
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Someone shot your taco??? Wtf
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Old 05-18-2012, 09:32 AM   #3
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I inherited it that way LOL, I do feel good about the progress though.
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Old 05-18-2012, 09:37 AM   #4
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Poor taco try sea foaming it? Check for shit in the gas tank? MAF sensor
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Old 05-18-2012, 10:08 AM   #5
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will try seafoam tonight.
Thanks
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Old 05-18-2012, 10:09 AM   #6
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Anytime! I think there is a sticky on it
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Old 05-18-2012, 03:55 PM   #7
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Junk in bottom of fuel tank

O2 sensors could be adjusting the lean/rich mix... Just a thought I would seafoam it first. Replace fuel filter as well
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Old 05-18-2012, 03:57 PM   #8
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I could be missing something..but you said that it fluctuates between high and low idle..but that is normal.

Low idle is ~750 and high idle is ~1100.

Unless it does it in rapid succession.

Need more details.
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Old 05-18-2012, 04:10 PM   #9
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The OP stated his idle fluctuates up and down while cool and warm. That is not normal. It should idle at about 1100 until warm then drop to 750ish.


I recently helped a friend get an old Ford running that had sat parked in a field for four years. We had to replace fuel tanks, pumps, filters, spark plugs, wires, dist, and cap. It was a nightmare but ran like a champ when we got it done.
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Old 05-18-2012, 04:13 PM   #10
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Mine has always fluctuated between high and low idle when at operating temp. It runs fine...
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Old 05-18-2012, 04:13 PM   #11
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Quote:
Originally Posted by TacoMX View Post
I could be missing something..but you said that it fluctuates between high and low idle..but that is normal.

Low idle is ~750 and high idle is ~1100.

Unless it does it in rapid succession.

Need more details.
I think he means in rapid succession. ive heard of that before.. its weird
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Old 05-19-2012, 08:43 AM   #12
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Quote:
Originally Posted by TacoMX View Post
Mine has always fluctuated between high and low idle when at operating temp. It runs fine...
Doesn't sound right. My cold idle range: 1000 to 1250. Operating idle: 600 to 850.
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Old 05-19-2012, 10:59 AM   #13
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My Tacoma had jacked up fluctuations like this, not too rapid, but very noticeable.

Turned out to be a bad throttle position sensor
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Old 05-19-2012, 11:26 AM   #14
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Yes in rapid succession, definitely not normal. Gonna run to the parts store and get some seafoam hopefully it stops raining here so I can work on it.
Thanks for all the replies guys
Cheers
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Old 05-19-2012, 05:18 PM   #15
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Rain??? what's that??
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Old 05-19-2012, 05:31 PM   #16
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Quote:
Originally Posted by TacoMX View Post
I could be missing something..but you said that it fluctuates between high and low idle..but that is normal.

Low idle is ~750 and high idle is ~1100.

Unless it does it in rapid succession.

Need more details.
My low idle is at about 650 rpm's
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Old 05-21-2012, 07:03 AM   #17
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Alright, Seafoamed, and carb cleaner looking for vacuum leaks, no dice!!!. Still doing it. Grrrr.....
What should I try next?
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Old 05-21-2012, 07:04 AM   #18
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Quote:
Originally Posted by dentaco76247 View Post
Rain??? what's that??
Colorado weather, 84 one day and rain and 54 the next, gotta love it.
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Old 05-21-2012, 04:17 PM   #19
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The O2 sensors may be adjusting your a/f ratio searching for correct most efficient burn.
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Old 05-24-2012, 10:54 AM   #20
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Looks like I will try the O2 sensor next.
Thanks for the input. I may tow it to the autoparts store and get it scanned first, see what codes they pull.
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