1jz bogs while in boost!
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Pole Position
Joined: Jun 2005
Posts: 259
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From: tx
1jz bogs while in boost!
ill make it simple. i have a stock 1jz, greddy fmic, and im running on usdm 93 2jzgte plugs, O2 is not hooked up. no vaccum leak. while my engine is cold. boosts good at WOT.. after the engine's warmed up. everytime at WOT it bogs when it hits boost. but if i slightly tap on the pedal to reach full boost, no problem what so ever. im thinkin could it be my plugs thats causing this?
Lexus Champion
Joined: Feb 2007
Posts: 2,489
Likes: 4
From: Lou-Evil KY
why woud you not run an 02 sensor? that's silly, the ecu has no idea what's going on. of course at wot, it doesnt' matter, because then the ecu doenst use the 02 sensor for feedback. but before that, you may be getting too rich before wot causing the bogging.
Jon
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Instructor
Joined: Jan 2004
Posts: 853
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From: Ohio
I am just wondering how at WOT not in boost its good then in boost its not... maybe plugs... maybe plug gap... i dont know Im just trying to help the guy out.
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Lexus Champion
Joined: Feb 2007
Posts: 2,489
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From: Lou-Evil KY
well lets think about this. engine cold, closed loop= rich condition. full boost at engine cold, richer than normal, runs fine.
engine warm, closed loop but no longer rich from cold start, wot, bogging. i'd say he's going lean. man i hate dealing with tuning issues without any datalogging. a wideband would tell us what we need to know very quickly.
engine warm, closed loop but no longer rich from cold start, wot, bogging. i'd say he's going lean. man i hate dealing with tuning issues without any datalogging. a wideband would tell us what we need to know very quickly.
2jzlex: i understand what your saying as I understand closed vs. open loop modes along with the maps that are used. the thing that I am trying to help with is why it bogs when warm and only when it hits boost. I am trying to remove all the extra variables that may be affecting the in-boost factor. That is all. Obviously the info that he gave us is incomplete since it doesnt give anything but what is happening and under what conditions giving no info as to what parts (stock vs. aftermarket) any tuning etc.
I am just wondering how at WOT not in boost its good then in boost its not... maybe plugs... maybe plug gap... i dont know Im just trying to help the guy out.
I am just wondering how at WOT not in boost its good then in boost its not... maybe plugs... maybe plug gap... i dont know Im just trying to help the guy out.
Sorry about that mixup.Jon
Instructor
Joined: Jan 2004
Posts: 853
Likes: 7
From: Ohio
ahh, my bad then also. Either way, I'm thinking that in addition to the O2 sensor 
the other things to check should be:
1. plugs (gap and condition)
2. timing
3. coils
4. charge pipes for leaks
after that im at a loss... nismo get back to us with what you have tried and the results.
the other things to check should be:1. plugs (gap and condition)
2. timing
3. coils
4. charge pipes for leaks
after that im at a loss... nismo get back to us with what you have tried and the results.
Thread Starter
Pole Position
Joined: Jun 2005
Posts: 259
Likes: 0
From: tx
...ok heres the deal. ill hook up the o2 tomorrow. condition of the plugs are good... can i run usdm 2jzgte ngk plugs with the 1jz..... i havent touched timing, i just bought the motor and dropped it in. ill double check the coils tomorrow... no vaccum leaks at all. can it be the tps?
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