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Old 07-01-2002, 07:55 PM   #1
obyone
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Default Hesitation @ 2700 RPMs.

Has anyone else noticed some hesitation, when accelerating, @ 2700 rpms? I never noticed it before but now I do. It only happens when I have the A/C on though. I used to have this same kind of hesitation when my old toyota had bad plugs and was misfiring. The hesitation feels like if you let off the gas for a split second while your accelerating.
I'm not sure if it's an A/C thing or if it's a bad spark plug. The weird thing is that, if it was a bad plug, there is no CEL.
I'm just looking for some quick suggestions before I go giving the car a complete tune-up.


Edit: Sorry...The hesitation happens at 2700 not 3700.
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Last edited by obyone; 07-01-2002 at 10:40 PM.
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Old 07-01-2002, 08:33 PM   #2
Krelkor
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try the grounding mod

its pretty common hesitation, almost everyone has it
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Old 07-01-2002, 09:53 PM   #3
moogooob
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My AC seems to suck all the power from my car.
I prefer 2-60 air anyways so i rarely use my AC
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Old 07-01-2002, 10:45 PM   #4
obyone
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Quote:
Originally posted by Krelkor
try the grounding mod

its pretty common hesitation, almost everyone has it
Maybe you should read the post I did explaining my grounding experience. Lets just say...the mod was an experience with Murphy's Law.

http://forums.nasioc.com/forums/show...hreadid=207722

Funny thing is...I never noticed the hesitation until after I did the mod. I also removed the ProECM that same day. Don't know if that has anything to do with it.
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Old 07-01-2002, 11:47 PM   #5
Aprilia Jon
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I had that hesitation and the ECU recall fixed my problem. Mine was at 3500-3700 though (I think) but it was exactly like you say. It happened with a/c and with no a/c. Take it to your dealer and see if you can talk them into the ECU reprogram recall.
Jon
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Old 07-02-2002, 12:28 AM   #6
Jesse Lorenzen
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I have been able to get rid of the hesitation with no A/C, or maybe just reduce it enough to negligible, but whenever the A/C is on it is very noticable. For me the reprogram didn't seem to help.
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Old 07-02-2002, 02:34 AM   #7
ChosenWon
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After the grounding mod....My hesitation is GONE. With new plugs, an oil change, and the grounding mod, My car is smoother now than the day I drifted out of the dealer's lot.

The grounding mod is a MUST do. One guy used old lamp wire and got rid of the hesitation. do the mod now. your heavy foot will thank you later!
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Old 07-02-2002, 11:11 AM   #8
lakepop
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Lightbulb

Given how easy/cheap it is to do.......I'd surely TRY the grounding mod......
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Old 07-02-2002, 01:14 PM   #9
IggDawg
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It's less common with the '02s, but we still get it. Grounding mod is your best bet. Look up the "SPG" thread.

-IggDawg
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Old 07-02-2002, 02:02 PM   #10
jhonas
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Quote:
Originally posted by IggDawg
It's less common with the '02s, but we still get it. Grounding mod is your best bet. Look up the "SPG" thread.

-IggDawg
true, I can feel some hesitation right around 4000 rpms (+/- 500 or so) when accelerating in first or second gear. I think I'll try out the grounding mod simplified (1 wire to engine block close to battery, if more is needed, then I'll work from there).
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Old 07-02-2002, 03:27 PM   #11
Pinochle
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Quote:
Originally posted by jhonas
true, I can feel some hesitation right around 4000 rpms (+/- 500 or so) when accelerating in first or second gear. I think I'll try out the grounding mod simplified (1 wire to engine block close to battery, if more is needed, then I'll work from there).
Okay, to reflect on the grounding mod. Why not use an Ohm meter to check the resistance on the line before you start putting wires everywhere. That way... you can see if you really need it.

P.
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Old 07-02-2002, 09:44 PM   #12
obyone
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Quote:
Do the grounding mod

...I guess no one read my grounding mod adventure?

http://forums.nasioc.com/forums/show...hreadid=207722
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Old 07-02-2002, 10:50 PM   #13
ciper
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Not only use the ohm meter to measure the resistance with the key off, but also measure the voltage from two ground points while the engine is running.
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Old 07-02-2002, 11:08 PM   #14
Keith99RS
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Talking Off the topic guys

Uhh, guys? He said it is when he has the A/C on. The hesitation he is getting is when the clutch on the A/C engages and disengages. When you get on the throttle, the clutch reduces the load sent to the A/C system pully to give more power for accelleration. This happens on my car and my fiance's Legacy Outback. I truly don't think the hesitation issue he is having is a grounding problem if it only occurs when the A/C is on and doesn't appear with the A/C off.
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Old 07-03-2002, 06:20 PM   #15
obyone
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Default Re: Off the topic guys

Quote:
Originally posted by Keith99RS
Uhh, guys? He said it is when he has the A/C on. The hesitation he is getting is when the clutch on the A/C engages and disengages. When you get on the throttle, the clutch reduces the load sent to the A/C system pully to give more power for accelleration. This happens on my car and my fiance's Legacy Outback. I truly don't think the hesitation issue he is having is a grounding problem if it only occurs when the A/C is on and doesn't appear with the A/C off.
Thats why I asked, "I wonder if it's an A/C thing?" The weird thing is that it only happens at 2700rpms. You'd think that it would lessen/disenguage the A/C as soon as, or a tad after, you mash the throttle.
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Old 07-12-2002, 09:22 AM   #16
Whit
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Quote:
Originally posted by obyone



...I guess no one read my grounding mod adventure?

http://forums.nasioc.com/forums/show...hreadid=207722

I just did, thanks for the laugh, as in Been there Done that!
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