 Light throttle hesitation? |
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 Jul 29, 2008 - 11:43 PM
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Enthusiast  Joined Aug 19, '07 From Farmington, MI Currently Offline Reputation: 7 (100%)  |
Okay, this has been a problem for a long time now, its a jdm gen 2. Anyways whenever i am around 20-10 vac on light throttle curising, around 2-3k, it always tends to jump, thump around, feels like a missfire or something. Whenever i reset the battery. It goes away for the first 10-20mins and then comes back slowly. I really have no clue any more cause i have replaced a bunch of things(list below). The car idles around 950, vac is 21. It goes into boost fine, and wot fine. It has a very weird low rpm missfire around 1100 or so, where it burps and jumps up.
List of things replaced Spark Plugs(brand new gapped to .28) Spark Plug wires(brand new) Cap+Rotor(replaced 3k ago) TPS(replaced, and set according to bgb) Fuel Filter AFM(check to bgb standards, and swapped with a friend) Boost Leaks(have done well over 5 tests, not one leak at all around 15psi) Vac Leaks(same thing) Cold Start Injector(Bypass, and closed off, not in function) Coil(Have gone and tested threw 3, all came out to .7, 12.56, but came off working cars) So that sums it up, I have no clue for here, I was thinking maybe ecu temp sensor, or changing out cap and rotor again, but am clueless from there. Compression is 180 across the boards if anyone was wondering, please guys help me out, thanks |
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Jul 31, 2008 - 11:25 AM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
TPS calibration?
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Jul 31, 2008 - 12:42 PM
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Enthusiast Joined Aug 19, '07 From Farmington, MI Currently Offline Reputation: 7 (100%) |
when u say calibration, do u mean setting it or testing the tps itself?
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Aug 1, 2008 - 12:00 AM
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Enthusiast Joined Aug 19, '07 From Farmington, MI Currently Offline Reputation: 7 (100%) |
problem found and solved...
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Aug 1, 2008 - 1:02 PM
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 Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
ummm... so what was it?
-------------------- 15PSI - 30MPG - Megasquirt Tuned
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Aug 1, 2008 - 1:32 PM
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Enthusiast Joined Aug 19, '07 From Farmington, MI Currently Offline Reputation: 7 (100%) |
base timing
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Aug 1, 2008 - 2:23 PM
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Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
I thought you said you had checked it already?
Either way, at least its fixed now. -------------------- 15PSI - 30MPG - Megasquirt Tuned
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Aug 1, 2008 - 8:00 PM
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Enthusiast Joined Aug 19, '07 From Farmington, MI Currently Offline Reputation: 7 (100%) |
like i did check the iginition timing, but the actually cam timing is off, thats base timing right>
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Aug 1, 2008 - 10:59 PM
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Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
Cam timing is your mechanical timing.
Base timing is your ignition timing. So you took your timing belt off, and readjusted it ? -------------------- 15PSI - 30MPG - Megasquirt Tuned
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Aug 1, 2008 - 11:53 PM
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Enthusiast Joined Aug 19, '07 From Farmington, MI Currently Offline Reputation: 7 (100%) |
ya its in the process right now, but i am gonna replace the belt as well, should i do the tensioner too? i mean theres nothing wrong with both, just the cam timing is off
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