CrAzE191st

i think you should check your clutch and then get back to us

Eddie 70

TTT

djslim23

Check your IACV. Put 9V on it and see if it moves. If it tries, clean it with carb/brake cleaner. If it doesn't replace it. I'd be willing to put $ on it that that's the problem, and I'm not even a mechanic!

Datsmart

Sorry for the late reply, but I had the same problem.
Started swapping parts between my 92 sedan and my son's 93.
Swapped IACV, Dizzy, then TB. No change.
Ended up swapping wiring harnesses and resolved issue. Turns out my harness had a bad wire in the throttle position sensor plug.

TwoFaced

I had the same thing...

It's the TPS on mine. I had a CEL though...maybe your CEL light is out on the cluster?

I put on a spare gsr TB and the problem went away...both TBs are spotless and have no sticking whatsoever. I'd place my bet on the TPS...or something related.

fleabag

I bookmarked this thread back when I first noticed this issue with my car (from the day I purchased it no less!) and now that I resolved it, I feel compelled to say what I did.

I've had this issue since I bought this car, (Civic LX w/D16Y7) and because I became too busy to work on it, I ended up parking the car for an extended period of time. When I tried to drive the car again (last week), I now had a bouncing idle. After doing various testing of sensors, I concluded the bouncing idle was attributed to the IACV valve being stuck. (Very common issue)

So I took off throttle body, took off the Idle Air Control Valve, and cleaned both of them with rubbing alcohol and q-tips, even taking out and cleaning the idle air screw and all the passages. Put the throttle back on the car, and it not only resolved my bouncing idle but it unexpectedly resolved my issue with the car jerking when feathering or releasing the gas pedal. This was a major improvement because one issue with my car was that I couldn't maintain speed on the highway, I was either accelerating or decelerating. At a stop in neutral, barely touching the throttle would make the engine speed jump from idle (670rpm) all the way to 1500 to 1800rpm, impossible to rev the engine to something like 1000rpm. Doing this thorough cleaning (so I couldn't hear what sounded like grinding sand when turning the throttle and IAC valve) really has made a difference in how the car drives.

My suggestion is to do a thorough cleaning like I did even if your IAC valve isn't stuck because if it isn't stuck now, it WILL be in the future and both the IAC valve and the idle screw, other passages etc. get covered in carbon and are only asking for trouble. It's very possible the other suggestions in this thread will go hand in hand with resolving this issue for you or others who are reading this which is why I'm also suggesting doing what everyone above me has suggested as well. I'll probably be replacing the motor mounts on my car anyway since at least one of them looks cracked and when I do my engine swap I'll be checking the wiring harness to make sure that there are no weak or broken wires.

It's suppose to be at 12 degrees +/- 2 degrees with a fully warmed up idle at around 700rpm.

sk8shorty012

iTrader: (3)

Here's an update:

I replaced the clutch with a brand new OE Exedy Replacement.
I replaced the rear motor mount (with a Type-R unit)
I installed energy suspension inserts on the front torque mounts.

The mounts needed to be replaced, along with the clutch so it's not like I'm throwing money at it....

BUT, the problem still persists?

SHG_Claudio

Yeah I have the same problem. Even if pressing/letting go lightly it jerks. Very annoying. I need a tune up and my mounts are probably bad too. My FITV needs to be cleaned but I can't get it open.

sk8shorty012

iTrader: (3)

I talked with the tech who did my clutch and he seems to think it's "play" in the LSD and not throttle / air related at all otherwise there'd be a "hotspot".

muzzeemoto86

could be the iac idle air control i was having that problem...itll will surge at idle and around medium throttle or aroun 2000 to 2500rpm it would jerk really bad in any gear...check it out couldnt hurt...

muzzeemoto86

<<<<shouldve read further down but thanks

fleabag

hey tard, how about you read other posts besides your own...such as...MINE.

did you just quote yourself and respond to yourself in the third person?

sk8shorty012

iTrader: (3)

I've read your post. I don't have those symptoms and the IACV has been cleaned.

fleabag

You don't have this issue with the car? I had that issue before I had the issue with the bouncing idle.. Also I think you missed the part where I cleaned the throttle body.... The only other possible thing is a sticky throttle cable but if you can't feather the throttle by actuating it manually with your hand (on the throttle body), then it's probably not the cable. All the suggestions in this thread are good and I think it's more likely that you glossed over the solutions or didn't do them quite right than it being anything else.

TwoFaced

I'm still gonna stick with the TPS theory. I replaced mine recently after having the exact same symptoms...problem gone instantly.

fleabag

to replace the TPS you have to replace the ENTIRE THROTTLE BODY.. Those aren't cheap, why not do everything that won't cost money and only add value?

TwoFaced

^ youre wrong. You can replace the tps without replacing the tb...don't listen to do dealership and do some research...I just removed and replaced my tps maybe two fays ago.

fleabag

So I'm assuming you used this one?
http://www.statracing.com/buy/omni-tps.asp

Pretty cool that you can replace the sensor, however I think the OP should just test the sensors in the car according to the Helms. Never understood why people spend so much time asking questions about these cars yet never do the basic **** like buy a helms for like $40 and follow it.

Fliptard

I'm having this same issue in my 93 EX. I have an H22a4 swap. I know the throttle sticks sometimes, but only when it is JUST about closed. I can't drive this car at one speed going slow because it either jerks, or its go or no go. I'm just going to get a new cable and TB and see if it helps any.

Lao17

To much trq lol

TwoFaced

lol

@fleabag...nope...the first one I used I took off of a d15 tb I scored with some other parts...the second one I used was off a d16 tb and transfered to my GSR tb. Blox makes a replacement too. It's a pretty easy procedure.

sk8shorty012

iTrader: (3)

Lately I've also been having a fluctuating idle where it seems like it's about to die / shut off. I feel like I have to rev to 1,500 to 2,000 just to get out of 1st.

I'll clean the IACV and adjust my throttle cable today and report back.

Fliptard

Well, after mine did it.... I realized the bolt hole on my block at the cam side were broke, so my motor moved around, ALOT and that's why mine did it.

Fliptard

Amen to that!!

stuckoncivic99

I am having a sort of similar problem but mine revs great and idles fine as soon as i put the car in gear and release the clutch the car jerks violently and wants to die unless i keep reving the motor. I have no CELs. I bought the car from someone that installed the motor in the bay but simply couldnt figure what came next i plugged the harness rite up and started up sounds great in comparison to some swaps ive started up.im kinda questioning the clutch assmbly pls help me. I am in need of wheels asap any ideas.