3.4 Swaps The 3.4 V6 Toyota engine

Runs and Drives but Hesitates and bad gas milage

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Old 05-05-2015, 01:04 PM
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Runs and Drives but Hesitates and bad gas milage

I have a 95 Toyota Pickup. 5 speed, 4wd. Swapped a 97 4runner auto, 4wd 3.4 into it. Converted harness from auto to manual. I have correct MAF and ECM for engine.

Truck runs and drives. slow acceleration, hesitates and bogs.
no codes
horrible gas mileage
fuel pressure is good
02 sensor reads o volts with scan tool.

Any ideas would be greatly appreciated. Thanks in advance. Working on it right now.
Old 05-05-2015, 02:11 PM
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Anyone??
Old 05-05-2015, 10:12 PM
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The zero volts on the O2 sensor sounds like it's not wired in correctly. The O2 sensor voltage should fluctuate.
Old 05-13-2015, 07:12 AM
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Agreed. Check your 02 sensor wiring. If it's reading 0 volts it's like running without an 02 sensor. You have some sort of wiring correct since you aren't throwing a code but it's got to be missing something somewhere
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