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Old 04-07-2016, 10:20 AM   #1
mikemc422
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Exclamation 91 w/ transmission problem and idle problem?

I just bought my 91 yesterday for $700. I think it needs an iacv, the idle throbs (only when not moving though), but I'm not sure. My 00' civic had a bad iacv but the idle didn't throb, it just was different every time I stopped. The throbbing idle went away after about 2 hours of driving though, and started again after I shut it off and turned it back on. The transmission grinds going into third, I'm not sure what's causing this though. It doesn't pop out, it shifts smoothly into every gear, but second and third take a little bit more effort (and a few times fourth too) and third grinds going into (but not coming out of) gear, no matter how fast I'm driving or how fast the engine is running. I also have a dead gauge cluster but I'm not too worried about that for now. Other than that, the car is fine (or at least I haven't noticed other issues).
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Old 04-07-2016, 10:28 AM   #2
Raf99
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Idle issue could be numerous things but the IACV or FITV should be checked. I'd check the site for other answers as there are many causes.

The grind into 3rd is most likely a bad syncro. I would check the tranny fluid first and make sure you use Honda fluids. You can try double clutching but it is still a bad syncro and nothing you can do but try to change the defective part.


Best of luck.
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Old 04-07-2016, 10:37 AM   #3
mikemc422
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Quote:
Originally Posted by Raf99 View Post
Idle issue could be numerous things but the IACV or FITV should be checked. I'd check the site for other answers as there are many causes.

The grind into 3rd is most likely a bad syncro. I would check the tranny fluid first and make sure you use Honda fluids. You can try double clutching but it is still a bad syncro and nothing you can do but try to change the defective part.


Best of luck.
Ok, thanks. I'll check the iacv and fitv tonight, and I called a few shops around here to see how much the synchro would be and the lowest I've gotten so far was around $1000. I'm having my cousin help me replace the tranny fluid tomorrow after work to see if that helps. The iacv, from outside, looks like it's never been touched, so I think I'll clean it even if it's not the problem.
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Old 04-07-2016, 11:01 AM   #4
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Ok, so I went to leave and it wouldn't shift. I think it's the slave cylinder but I'm not sure, I know that it wasn't replaced when the clutch was replaced back in January. The clutch still has pressure but doesn't engage all the way and doesn't push back as much.
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Old 04-07-2016, 12:39 PM   #5
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So I went and got a slave cylinder, got home and went to put the car up on the jack, and I the car is too low for my jack. Right now the car is about 1" off the ground along the sides, are there any jacks that would fit? If not, where is another safe place to jack up the car?
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Old 04-07-2016, 01:40 PM   #6
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Get two pieces of 2x4 wood.

Place each 2x4 in front of the front wheels.

Drive onto the 2x4.

Your car should be high enough to get the jack under it now.
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Old 04-07-2016, 06:14 PM   #7
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Yay!! It worked! Thank you!!

Now for some confusion... It wasn't the slave cylinder. There's something (a valve?) in between the master and slave cylinder that I think is leaking (hard to tell, everything is wet) but I'm able to drive the car, my father got in and pumped the clutch, started it, and it drove fine (we drove it about 5 miles, stopping multiple times). He thinks there's air in the line, but has never worked on a Honda. I'm going to bleed the line and see if that helps. One quick question about the transmission, how do I check the fluid? It looks like there's supposed to be a dipstick, but there isn't one. If there should be one, where can I buy a replacement?
I cleaned the iacv and fitv earlier, cleaning the iacv helped, but didn't fix it. I ordered a new iacv and that should (hopefully) fix the issue.
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Old 04-07-2016, 07:19 PM   #8
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No dipstick on standard transmissions, sir.

There's a fill hole and a drain hole. You have enough fluid when the full bolt starts to dribble on a flat surface. If you're doing a fluid change, it's a bit more than 2 quarts.

Eric The Car Guy does a DIY on bleeding a clutch. YouTube his channel.
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Old 04-07-2016, 08:08 PM   #9
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No dipstick on standard transmissions, sir.

There's a fill hole and a drain hole. You have enough fluid when the full bolt starts to dribble on a flat surface. If you're doing a fluid change, it's a bit more than 2 quarts.
Ok, thanks, I'll have to do that Monday when I'm off work. Hopefully tomorrow I can fix the idle so the car is drivable, my iacv should be in by 2:00
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Old 04-08-2016, 06:18 PM   #10
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Unhappy

So... I replaced the iacv ($220) and it helped (a little bit, not enough though), but definitely didn't fix the problem. The idle is still surging, and the car still jumps a little (probably from idle) at low speeds.
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Old 04-08-2016, 06:48 PM   #11
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Quote:
Originally Posted by mikemc422 View Post
So... I replaced the iacv ($220) and it helped (a little bit, not enough though), but definitely didn't fix the problem. The idle is still surging, and the car still jumps a little (probably from idle) at low speeds.
Check your idle screw.

It may have backed itself out. If so, screw it down and put some grey gasket goop on it to keep it from loosening again.
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Old 04-08-2016, 07:13 PM   #12
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Ok so I got it idling smooth now (the white plastic piece in the fitv had no tread, it kept popping out) and it drives good, except for in 1st/2nd gear it still occasionally jumps, and the idle seems low (I think it's close to stalling, I know that it shakes at idle because it's too low, but my tachometer doesn't work) how do I know when the idle is good now? Do I just adjust the idle screw until it stops shaking?
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Old 04-08-2016, 07:30 PM   #13
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Oh, and double clutching makes the grind into third go away, and it makes it easier to shift into the other gears, so I think I'll just do that until I can afford to rebuild the transmission
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