BLinindoll

I have a 97 LX. I have had a hesitation problem for some time now. Here's the deal. Only happens with about 1/8 to 1/4 throttle, mostley in first gear, but it will do it in all gears. Goes away when I press the throttle more. If I hold the throttle in the same spot, it is like I took my foot off, but after about 3 seconds it will slowly pick back up and be fine. It's not the motor. I swapped in another motor since it started doing it and still did it. I have now switched motor back to the original (for other reasons.) Still does it. Not the dizzy. I switched with a spare dizzy I had laying around. Same thing. I tested the TPS and it's smooth all the way to WOT. New wires, cap, rotor, plugs (did them just because.) Not any sensors on the engine because they were all swapped with each motor. BTW, it doesn't do it as much when it's cold, so I'm definitely thinking its a sensor. I'm still leaning towards the TPS. I have a spare one, so I'm thinkging of just swaping it anyways just to eliminate it further. Any thoughts?

BLinindoll

anyone? trying to fix tonight.

BLinindoll

found out tonight it also does it when in neutral. i can hold the throttle steady at 2 grand, and without moving my foot, it will drop maybe 500 rpms after a few seconds, then about 3 or 4 seconds later it will pick back up to 2k. then it will do it again after a few seconds.

btw, its not the tps. switched and same thing.

im thinking the only thing left would be map sensor. idk... im about to start getting mad.

Vi3t Vu

My Integra does the same thing. It started doing it after i miss shifted.
It wasnt to bad though i just bent a couple of valves but i got my entire head
rebuilt and it still does the same thing your car does. Even at idle the rpms will
jump up and down. And it is worse when it is hot.

BLinindoll

well i know it has nothing to do with my head, cause like i said, it has done the same exact thing with 2 completely different engines.

BLinindoll

no one else wants to help me out? cmon guys, i know someone can lead me in the right direction. im thinking map sensor. just havnt checked it yet.

924doorEG

could be the FITV valve or the IACV

BLinindoll

why the iacv? im curious. it used to give me problems cause the car sat for 4 years. it was sticking and idling high. i took it apart 2 or 3 times and cleaned it out with TB cleaner. still stuck for a while, but eventually freed itself and has been idling perfect ever since. im confused as to why it would be the iacv causing a stumbling situation. i cant see that cause a loss of power at a certain place in the throttle position.

924doorEG

well i replaced my iacv thinking it was my problem because my car would surge then drop down to low idle and almost die. and when is drops down that low it will also hesitate. but the fitv valve hs the same symptoms and can occur randomly like mine did, i had to rebuild mine. im assuming its the fitv valve making your idle low and hesitating.....have you checked the idle screw?

BLinindoll

i already said it idles perfect, which is why my guess would be that it is not either of those, considering they both only do anything at idle. thanks though

924doorEG

do you have a check engine light?

924doorEG

my thoughts is fuel filter or fuel pump

BLinindoll

no check engine light, brand new fuel filter. dont think its the fuel pump due to the fact that, again, it only happens at certain point in the throttle. fuel pump would be random, considering it's function has no connection to throttle position. if it came down to it i guess i could check it. anyone know where to get the adapter for a fuel pressure gauge for a civic?

im still leaning towards map sensor. wish i felt like checking it tonight, but id rather be inside, nice and warm on the computer.

924doorEG

timing?

BLinindoll

timing is good. have timed it several times due to swapping motors and dizzys

BLinindoll

not that it seems like anyone cares, but turns out it was the o2 sensor. thanks for the help guys.

gsrhybrid

OMG THANK YOU BLinindoll . Sorry for reviving an old post, but this will help some one else as it did me.
I had the same freaking symptoms on my 99 cx. I had code 41 as well and code 14. The hesitation started when car warmed up and at very light throttle. I replaced tps and iacv as well to no avail.

O2 fixed the problem !!