Car Hesitating at WOT

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Old May 13, 2002 | 06:25 PM
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Default Car Hesitating at WOT

My car hesitates when I floor it under boost. But when I apply around 80 percent throttle, it seems fine. What could be leading to this?
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Old May 13, 2002 | 06:33 PM
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Default Re: Car Hesitating at WOT (intekragsr)

you change out those bosch plugs yet and replaced them with ngks
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Old May 13, 2002 | 06:35 PM
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Default Re: Car Hesitating at WOT (D-Man)

nope havent changed the bosch plugs yet. I think I noticed this hesitating before I installed the plugs. Is it just a little side effect, or is it detrimental to my engine?
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Old May 13, 2002 | 06:40 PM
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Default Re: Car Hesitating at WOT (intekragsr)

Same thing happens to me- when I reach full boost at part throttle, it runs fine all the way to redline, but when I put it to the floor, as soon as it hits full boost it starts to jerk and hesitate from like 4000-6000 rpms, and then it winds out to redline fine.

I have a 00 Turbo Lude with a Hondata setup
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Old May 13, 2002 | 06:51 PM
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Default Re: Car Hesitating at WOT (intekragsr)

Is it just a little side effect, or is it detrimental to my engine?
Should have no side effects like that and it could mess up your motor,all depends on whats it doing,if everything is right(all parts in good condition)your fuel or timing map has too be off and in need of tune...but 1st thing i would do,is put the stock heat range OEM NGKs and see how it runs,probably the cheapest and easiest thing to do,then if that doesnt improve it,have it dyno tuned with a wideband O2


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Old May 13, 2002 | 07:48 PM
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Default Re: Car Hesitating at WOT (D-Man)

when i first installed my turbo
i had some hesitation when i floored it
changed out my plugs with 2 steps colder then stock, gapped them to .032
it was fine after that
no hesitation
i would recommend trying that first
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Old May 13, 2002 | 07:56 PM
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Default Re: Car Hesitating at WOT (intekragsr)

Sounds like a possible lean condition.
Is the car tuned?
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Old May 13, 2002 | 08:26 PM
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Default Re: Car Hesitating at WOT (intekragsr)

you are probably not tuned well!
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Old May 13, 2002 | 09:35 PM
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Default Re: Car Hesitating at WOT (GruvyTune)

bad distributor rotor maybe... but do the plugs before anything...
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Old May 13, 2002 | 10:17 PM
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Default Re: Car Hesitating at WOT (93LSivic)

Sounds like a possible lean condition.
Is the car tuned?
I agree.
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Old May 13, 2002 | 10:22 PM
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Default Re: Car Hesitating at WOT (CleanSi-T)

well everything is stock from the drag kit untill I get my hondata in. I dont see how i can run lean when I got the 12:1 disk and stock injectors.
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Old May 15, 2002 | 08:05 PM
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Default Re: Car Hesitating at WOT (intekragsr)

found the problem. The a/f gauge was not grounded to the battery, it was grounded to chasis. This was said to cause interference in open or closed loop.
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Old May 15, 2002 | 08:09 PM
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Default Re: Car Hesitating at WOT (intekragsr)

I thought it's ok to ground to the chassis, and grounding to the battery is unecessary...?
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Old May 15, 2002 | 08:17 PM
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Default Re: Car Hesitating at WOT (Teg4e)

I thought it's ok to ground to the chassis, and grounding to the battery is unecessary...?
This quote is from the High Performane Honda Builders Handbook.

"You must install the black wire to the Battery terminal to prevent false signals to your meter. Your vehicle has multiple ground wires on the chassis, instrumnet panels, ect. These signals can fool your A/F meter if you ground it anywhere other tahtn the negative terminal. On EFI vehicles that run 02 sensors, unless you ground the black wire to the negative terminal of your battery, you will screw up your vehicles closed loop operation"

Just wanted to inform those who have not hooked it up right. I noticed a big differnece in performance.
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Old May 16, 2002 | 06:49 AM
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Default Re: Car Hesitating at WOT (intekragsr)

I thought it's ok to ground to the chassis, and grounding to the battery is unecessary...?

This quote is from the High Performane Honda Builders Handbook.

"You must install the black wire to the Battery terminal to prevent false signals to your meter. Your vehicle has multiple ground wires on the chassis, instrumnet panels, ect. These signals can fool your A/F meter if you ground it anywhere other tahtn the negative terminal. On EFI vehicles that run 02 sensors, unless you ground the black wire to the negative terminal of your battery, you will screw up your vehicles closed loop operation"

Just wanted to inform those who have not hooked it up right. I noticed a big differnece in performance.
Wow, that's really interesting. I sure don't want hesitation when I eventually get my turbo kit. I guess i'll have to redo my ground wire setup then! Oh well, I like workin on this crap.

Lemme ask a newbie question: How do I ground the wire to the neg terminal? Before I soldered on a brass flat, U type thing to fit under a screw under the dash. What type of connector will fit the battery terminal? thanks....
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Old May 16, 2002 | 07:05 AM
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Default Re: Car Hesitating at WOT (Teg4e)

the hesitation is your fuel. i have the same problem. it is because of your map sensor. the only way to get rid of it is a stand alone management system. or maybe the vtec afc w/hack. the lean cause my o2 sensor to turn white.
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Old May 16, 2002 | 07:16 AM
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Default Re: Car Hesitating at WOT (intekragsr)

you did properly gap your plugs to .030-.032.... correct?
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Old May 16, 2002 | 10:18 AM
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Default Re: Car Hesitating at WOT (GudeH23a)

to ground to the battery, run the wire all the way to the negative terminal. Simple.

Yes, my plugs are properly gapped. I have no more hesitation in my car
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Old May 16, 2002 | 10:21 AM
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Default Re: Car Hesitating at WOT (intekragsr)

found the problem. The a/f gauge was not grounded to the battery, it was grounded to chasis. This was said to cause interference in open or closed loop.
The O2 sensor is not even used at WOT (hence the term open loop). I have a cheap autometer A/F gauge grounded to the chassis and it works fine.

Take everything in those honda builders books with a grain of salt... they make lots of generalizations and promote some misinformation. I particularly like how they recommend not replacing the main bearings when rebuilding that del sol motor, because they "don't wear much"
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Old May 16, 2002 | 10:25 AM
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Default Re: Car Hesitating at WOT (intekragsr)

to ground to the battery, run the wire all the way to the negative terminal. Simple.

Yes, my plugs are properly gapped. I have no more hesitation in my car
Well your A/F gauge has nothing to do with WOT performance, or partial throttle performance for that matter. At best it might trivially increase the accuracy of the autometer gauge itself.

Hesitation at WOT is usually a fuel delivery issue.

Placebo effect perhaps?
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Old May 16, 2002 | 10:44 AM
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Default Re: Car Hesitating at WOT (dustin)

ok, you pretty much made me feel like a weetard after trying to think I knew what I was doing. Its really strange though how the hesitation went away though. I understand what your saying dustin.
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Old May 16, 2002 | 10:50 AM
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Default Re: Car Hesitating at WOT (intekragsr)

That's cool though. Maybe your FMU or pump were acting up but it got better?
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Old May 16, 2002 | 09:24 PM
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Default Re: Car Hesitating at WOT (intekragsr)

OK, cool i don't have to redo my a/f guage ground wire....
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Old May 17, 2002 | 12:22 AM
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Default Re: Car Hesitating at WOT (Teg4e)

u might want to just in case. Its reallllly easy
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Old May 17, 2002 | 02:58 PM
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Default Re: Car Hesitating at WOT (intekragsr)

u might want to just in case. Its reallllly easy
OK, could you be more specific on what connects the ground wire to the terminal? I don't think i can use that flat, brass-U i used behind a screw.
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