20V Blacktop Hesitation - Toyota Nation Forum : Toyota Car and Truck Forums


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6th Generation (1988-1992) Specific discussion of the AE92

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Old 05-24-2010, 05:40 PM   #1 (permalink)
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20V Blacktop Hesitation

I started this thread because I still had questions about the Blacktop hesitation, and we had alrady clutterd up the one about the C-52 gearbox with hesitation chatter.

C52 + 20v

I also thought it might help anyone doing a search later.

Anyway, for all those who have experienced the hesitation of a 20v Blacktop the question I have now is, were these cars running the stock airbox, anykind of airbox, an after market cone filter, or open trumpets?
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Old 05-24-2010, 06:18 PM   #2 (permalink)
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My brother's car gets this hesitation, air box is still stock with generic autostore drop in filter inside. The car is entirely stock ae111 levin. The problem usually happens when the car isnt warmed up, around 3000rpm. I will try to get a vid sometime this week.
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Old 05-24-2010, 10:29 PM   #3 (permalink)
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i ran with the t3 velocity stacks with itg filters. i tried everything. the funny thing was the engine ran best when the o2 sensor was unplugged. got a new 6 speed ecu and o2 sensor and it still did it on very slightly.
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Old 05-25-2010, 06:22 PM   #4 (permalink)
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Quote:
Originally Posted by Evo_lucian View Post
My brother's car gets this hesitation, air box is still stock with generic autostore drop in filter inside. The car is entirely stock ae111 levin. The problem usually happens when the car isnt warmed up, around 3000rpm.
That's not very encouraging to hear.
I was thinking maybe it was running without the airbox or the plenum that was the problem.

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i ran with the t3 velocity stacks with itg filters. i tried everything. the funny thing was the engine ran best when the o2 sensor was unplugged. got a new 6 speed ecu and o2 sensor and it still did it on very slightly.
Now that's confusing.
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Old 05-26-2010, 04:25 PM   #5 (permalink)
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If it makes any difference, the car has a broken o2 sensor. Don't know if that's the cause
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Old 05-26-2010, 04:56 PM   #6 (permalink)
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Quote:
Originally Posted by Evo_lucian View Post
If it makes any difference, the car has a broken o2 sensor. Don't know if that's the cause
After reading what rdyzz posted, I am not so sure.
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Old 05-26-2010, 06:14 PM   #7 (permalink)
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if the engine had aftermarket header then placement of the O2 sensor can cause issues with it... taking it off means the engine is running without closed loop correction, thus it alters the fueling slightly.
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Old 05-26-2010, 06:47 PM   #8 (permalink)
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That sounds logical but i know of other owner of stock blacktops with stock headers and o2 sensor in tact that still get the hesitation. Rdyzz said he still had the hesitation with the o2 sensor so i really don't know. I have an o2 sensor to install on the car so after that i will see if the issue persists.
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Old 05-26-2010, 08:33 PM   #9 (permalink)
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if anyone read that thread I posted about the green ae101 we blacktop swapped, his car is running stock itb box with generic cone filter, stock header and downpipe with gutted cat. all vacuum lines hooked up correctly and iscv working. He has put on about 5000km since we swapped it and only gets a slight hesitation when its cold in lower rpm's. And I think the best he got on 40L of gas has been almost 500km's.
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Old 05-27-2010, 04:59 AM   #10 (permalink)
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AE92

just putting it out there my 4AF does this aswell when it's not warm but when it's hot it runs fine im running aftermarket headers and airfilter it has done it without all the aftermarket parts aswell
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Old 05-28-2010, 01:53 AM   #11 (permalink)
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Is this common on blacktops? Or is it a hit or miss?

Someone on the 4ag forum believed its in the factory tune. And I found a thread on a different forum a while ago where they used a honda ecu and rigged up a honda dizzy and tuned it like that. Said its unbelievable how much better the car runs. just my two cents.

Edit:

Found it. May try on 4afe for boost.

http://forums.club4ag.com/zerothread...&postid=681332

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Old 05-28-2010, 03:03 PM   #12 (permalink)
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Quote:
Originally Posted by NZAE92 View Post
just putting it out there my 4AF does this aswell when it's not warm but when it's hot it runs fine im running aftermarket headers and airfilter it has done it without all the aftermarket parts aswell
Might be timing off, or throttle position sensor.

Quote:
Originally Posted by kwint View Post
Is this common on blacktops? Or is it a hit or miss?

Someone on the 4ag forum believed its in the factory tune. And I found a thread on a different forum a while ago where they used a honda ecu and rigged up a honda dizzy and tuned it like that. Said its unbelievable how much better the car runs. just my two cents.

Edit:

Found it. May try on 4afe for boost.

http://forums.club4ag.com/zerothread...&postid=681332
This is very interesting, and if we could get more details it would be great. Does anybody know how to falsh a honda ecu?
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Old 05-28-2010, 04:29 PM   #13 (permalink)
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Quote:
Originally Posted by Donald View Post
This is very interesting, and if we could get more details it would be great. Does anybody know how to falsh a honda ecu?
it seems to me running a megasquirt (DIYPNP) is way easier... but I may be a bit bias
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Old 05-28-2010, 08:13 PM   #14 (permalink)
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it seems to me running a megasquirt (DIYPNP) is way easier... but I may be a bit bias
I strongly believe you are right!!
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Old 05-28-2010, 08:42 PM   #15 (permalink)
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Chipping kit only $19.50
http://www.xenocron.com/chipping-kit...cus-p-277.html

How to chip the ecu

Base maps are readily available online for free. This seems to be a much easier and cheaper option than megaquirt. Go to junk yard, pull ecu,harness, and sensors from honda. Wire it up tp 4ag, probably might be less work than wiring up a megasquirt if you don't get the pnp. Chip ecu, download a basemap and tune away. If a friend didn't offer me a free emanage blue i might have attempted to do this on my 4agte
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