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TOPIC: Please! Need help on my 96 Toyota Tacoma

Please! Need help on my 96 Toyota Tacoma 07 Jul 2019 11:56 #1

  • Ron Kanna
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I need help! In the past I have done 3 other foreign cars (95 Honda Accord, 2001 Nissan Altima and 1996 Nissan Sentra) with no significant gains and usually significant loses! This time I decided to get a throttle body grooved by the man himself but it still didn't work?
I plugged the pcv, I checked for vacuum leaks and found none.
When I installed the new grooved throttle body I actually got a 16.84% loss in mpg!!??
Any suggestions will be greatly welcomed to get my pickup in the mpg gains that soooo many in Gadgetman Land have been talking about!!
Thanks,
Ron

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Last edit: by Ron Kanna.

96 Toyota Tacoma 07 Jul 2019 20:59 #2

  • GregK
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My suspicion is that this truck’s computer is compensating for the lack of unburned hydrocarbons in the exhaust.
Please search the forum for EFIE, and consider adding one to your upstream oxygen sensor(s).

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96 Toyota Tacoma 07 Jul 2019 21:19 #3

  • Ron Kanna
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Thanks, I have been considering doing that.
But I was thinking, I know that can be dangerous!! Why would it get 16% worse mileage if the computer was compensating? Wouldn't you think it would stay the same but not get worse??

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Last edit: by Ron Kanna.

96 Toyota Tacoma 07 Jul 2019 22:55 #4

  • CLAUDIO CORDOVA
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I had a question, on those vehicles have the O2 sensors or air fuel sensors been changed? If not, that might be hindering the ecu relearn process.
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Please! Need help on my 96 Toyota Tacoma 07 Jul 2019 23:53 #5

  • GregK
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Claudio makes a good point here, but the computer may need further convincing...
All we can do is offer different perspectives on the problem for you to determine the appropriate course of action to resolve it.
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96 Toyota Tacoma 08 Jul 2019 00:26 #6

  • GregK
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Ron Kanna wrote: Thanks, I have been considering doing that.
But I was thinking, I know that can be dangerous!! Why would it get 16% worse mileage if the computer was compensating? Wouldn't you think it would stay the same but not get worse??


The thing to remember or be mindful of is that by modifying the system, the overseer of that system will see a different data stream than it is programmed to consider as “normal,” so if the result is different than expected, you have to be prepared to rectify/alter it as well.
The groove modifies the air going in, which changes what the computer looks at coming out; this means you have to take into consideration all sides of the equation it looks at. That gives you a bunch of options - MAF/MAP alterations, o2 alterations, both and neither, and possibly others. Only you can determine what works best for your vehicle.
Conservatively, Carlos’ suggestion to consider changing the o2 sensor(s) and doing a re-learn drive cycle is valid.
Another possibility is that the truck needs a solid and complete tune-up (depending on how well maintained it was to begin with) before you start to see mileage gains. New spark plugs/wires, air filter, MAF cleaning- general basic maintenance- may be more effective than an EFIE or new o2 sensor(s). Maybe your exhaust system is leaky, maybe the EGR valve needs cleaning/repair, maybe the intake and exhaust valves are sticky...
The Groove can help, but a number of other things can elevate it to its highest potential: compression/blowby issues, general conditioning, sensor issues, valvetrain, all of the above...lots of possible problems/issues to be ruled out in this case.
You’ve come this far: it’s time to dig deeper to point you in the right direction
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96 Toyota Tacoma 08 Jul 2019 13:30 #7

  • Ron Kanna
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Each car I have tried this on has been well maintained, I've been a mechanic, built several races cars and much more. All cars have had new O2 sensors, new wires etc. with no positive results?? BUT not one car has ever had a significant gain and have had actual loses after installation.

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96 Toyota Tacoma 08 Jul 2019 13:34 #8

  • Ron Kanna
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I am wondering if anyone has actually done one of engines, what was needed for modifications and what the real results were?

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Please! Need help on my 96 Toyota Tacoma 08 Jul 2019 16:13 #9

  • GregK
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Is this a Direct Injection engine rather than port injection?

Would it be possible for you to post pictures of your groove job on this truck?

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Please! Need help on my 96 Toyota Tacoma 08 Jul 2019 18:34 #10

  • Ron Kanna
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It's port injection
The groove was done by the man himself, Ron Hatton.

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Please! Need help on my 96 Toyota Tacoma 08 Jul 2019 19:06 #11

  • Ron Kanna
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I installed an EFIE, set it at 130mV and did another test run.
Went from last run of 32.9 mpg to 28.5 mpg, a loss of 13.4%!!
After all this I increased the spark plug gap from 0.035" to 0.050" but that will be for another test run at a later date.

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Please! Need help on my 96 Toyota Tacoma 08 Jul 2019 19:37 #12

  • CLAUDIO CORDOVA
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Keep us informed on any changes or progresses. In the Honda accord, is it the 4cyl or v6? I might be able to help more in that brand. Also what is the engine in the Tacoma also?
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