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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 01-09-2013, 05:03 PM   #1 (permalink)
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@imnotbill
3VZ-E Poor Idle but no Indicator

I have a 94 4Runner 3.0. Second owner with all records. Recently did an Intake Silencer Removal Mod which went great, but once finished my car no longer idles well. I would occasionally have a bad idle from time to time but once I did the mod it has become consistent. Only idles poorly once the engine gets up to running temp. Seems to be running rich which I am assuming by the now terrible gas mileage I am getting compared to normal, but No Check Engine light to indicate what might be happening. Any Ideas?
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Old 01-10-2013, 11:31 AM   #2 (permalink)
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You need to read the EPIC 3vze thread linked in my signature line.
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Stock '94 DLX XtraCab 3VZE 4x4 5 spd, 17" FJ Cruiser Wheels, 276k miles, AISIN Manual Hubs
Law of Mechanical Repair: "After your hands are coated with grease, your nose will begin to itch and you'll have to pee!"

Multipe FSMs!!!
EPIC 3VZE info thread
Cheap OEM Parts: www.toyotaofnewnan.com

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Old 01-10-2013, 12:17 PM   #3 (permalink)
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After reading TNRabbit's sig link (highly recommend), I just posted with someone who had the same issue. It's common on the 3VZ-E engines, mine did it too but before I did the same "mod".

Here's the post: http://www.yotatech.com/f116/89-pick.../#post52024129

I'm confident it's the same issue but every truck is different so no guarantees. I've had some very unique issues with mine that weren't as easy as it seemed. Just don't buy any sensors until you tested them to make sure they are bad per the instructions in the FSM (using a multi-meter).
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'91 Pickup SR5 XTRA Cab- 4x4 3VZ-E 3.GO - 282k miles and counting.

Mods to date:
  • Cat-back system: 2 1/4" piping and Magnaflow Muffler - 20% increase in MPG & noticeable gain in HP
  • 7MGE VAFM swap and 3" Spectre intake - Increased throttle response and power
  • Flamethrower injectors and Flamethrower 45k volt coil, better low end torque.
  • K&N Air Filter
  • Kicker KS69 6x9" speakers in rear, Kicker 4" DS40 in the dash, Kenwood KDC-255U receiver, USB/Aux
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Old 01-24-2013, 08:13 AM   #4 (permalink)
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@imnotbill
I appreciate the links. I started going through everything to really diagnose the situation but the idle problem was getting progressively worse. Got so bad to the point that I ended up needing to take it in and have someone that actually gets paid to fix cars take care of it for me. (I'm still quite a newbie at all this.)

Turns out, the problem was low pressure in the fuel line due to dirty injectors. A BG Fuel Injector Cleaner took car of the problem which was a relief from all the other work I thought I might have to do.
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Old 01-24-2013, 08:13 AM
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