19 replies to this topic

[esty]

i devac'd my 87 and hopefully have everything correct...i couldn't find any vac leaks after plugging everything...i didn't remove any of the extra's fasten'd to the carb...the problems i'm having is it will idle really well, very smoothly for a few minutes after, warm up, then slowly die but starts easy.....and if i turn off the ignition when it's running well, it runs on and loads up with gas, flooding the engine, making it hard to start

any ideas or suggestions on what to look at

Edited by esty, 07 July 2007 - 11:25 AM.

[DarkHand]

Take a picture of your carb and lets see how you did. For my first devac, my carb literally overflowed with gas because I plugged the gas tank vent line. Make sure you leave that open.

Edited by DarkHand, 08 July 2007 - 06:39 PM.

[esty]

Take a picture of your carb and lets see how you did. For my first devac, my carb literally overflowed with gas because I plugged the gas tank vent line. Make sure you leave that open.

thank you for the help...i just bought this car thru ebay...i replaced the bad carb with this one...it runs really well but has the 2 problems i described above...slowly dying or if i turn it off while it's running, runs on and floods really bad....the only thing i have attached and not plug'd is the fuel line and the secondary thin, on the front of the carb...i have no idea which is the tank vent line
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Edited by esty, 08 July 2007 - 08:34 PM.

[Sgt. Pepper]

i devac'd my 87 and hopefully have everything correct...i couldn't find any vac leaks after plugging everything...i didn't remove any of the extra's fasten'd to the carb...the problems i'm having is it will idle really well, very smoothly for a few minutes after, warm up, then slowly die but starts easy.....and if i turn off the ignition when it's running well, it runs on and loads up with gas, flooding the engine, making it hard to start

any ideas or suggestions on what to look at

Can't help you with the devac........but nice rex! Looks pretty clean.

[rollz87civic]

Youdont have the hose hooked up in the right spots. look the gallery and search dev'vac

[73hp]

man oh man...i remember those days....the dvac pics help, but trial and error work best for me...i know its a pain, but get rid or ALL the boxes, and hoses etc....cap ema ll of when your done..back of engine and everything...leave open the tank preure releif on the firewall where the charcoal canister is..it looks like alittle nipple coming out the firewall...is your distributor hooked up correctly?dont try any "mods"till the car is devacd properly first. THE CAR IS "DIESELING"...your timing is advanced too much...you can use your clutch when you cut the car off to stop it...put it in gear and let of the cluch when stopped in driveway ...it wont do the running thing.....or get a weber...well worth it.

[esty]

Youdont have the hose hooked up in the right spots. look the gallery and search dev'vac

before i posted here, i believe i read all the devac threads ever posted...or at least all that i could find using various search terms...most of the pictures posted by other members are long gone and no longer available and the pictures did have available were just so much help...

you mention "You dont have the hose hooked up in the right spots"...would you be interested in telling me which hose(s) and where it/they are supposed to be? and if you know, what's causing the flooding?

[DarkHand]

It looks close, but a few seem off. I agree, since you're this far in, pull off everything that's not connected anymore so you can get a clearer view. All the vacuum boxes, hardlines, etc. Having the whole engine bay open and easier to work in is one of the main reasons for doing the devac anyway.

[esty]

It looks close, but a few seem off. I agree, since you're this far in, pull off everything that's not connected anymore so you can get a clearer view. All the vacuum boxes, hardlines, etc. Having the whole engine bay open and easier to work in is one of the main reasons for doing the devac anyway.

i do plan on removing all the clutter, i did remove the box on the inner fender but have been more focused and concern'd with getting the car running properly rather than removing the box on the firewall...but i am going to remove that as well

anyone want to tell me which is the fuel tank vent hose...that could be the cause of the flooding and dying...maybe

[esty]

here you go guys, i removed the box from the firewall...

[DarkHand]

here you go guys, i removed the box from the firewall...

That's looking better! There's lots more to pull, but that already will help.

The tank vent is on the firewall next to the two fuel lines. It's the farthest left red line in your last photo, next to the wiper motor and up and to the right of the AC lines. It looks like it's hooked up to the charcoal canister right now (which is correct, normally), but the canister might be full or stuck closed since it can't be controlled properly after a devac. Try pulling that line and running it that way for a while.



Also, this doesn't quite look right:



Unless you have locked timing (which you might have, I don't know), you need to tee off of the vacuum line running between the carb and the secondary diaphragm, and connect that to your distributor. I see a tee'd line to the bottom-left of the picture, which very well may be your distributor line, but I can't quite see where you've got it going.

Edited by DarkHand, 09 July 2007 - 02:49 PM.

[esty]

That's looking better! There's lots more to pull, but that already will help.

The tank vent is on the firewall next to the two fuel lines. It's the farthest left red line in your last photo, next to the wiper motor and up and to the right of the AC lines. It looks like it's hooked up to the charcoal canister right now (which is correct, normally), but the canister might be full or stuck closed since it can't be controlled properly after a devac. Try pulling that line and running it that way for a while.
Also, this doesn't quite look right:

Unless you have locked timing (which you might have, I don't know), you need to tee off of the vacuum line running between the carb and the secondary diaphragm, and connect that to your distributor. I see a tee'd line to the bottom-left of the picture, which very well may be your distributor line, but I can't quite see where you've got it going.

here's where my dizzy is connected....bottom of carb, below where fuel line connects...under the secondary diaphragm



should i move it as you described?

[DarkHand]

Yep, cap that on the carb and move that line over to the same circuit that the secondary is on cause that's definitely not right, but I don't think that would cause the problem you're having.

What's on the other part of the brown tee on that line?

Edited by DarkHand, 10 July 2007 - 09:59 AM.

[esty]

i got the car running better than it has since i bought it...it idles very smoothly and revs like you'd expect but....

i can't get the idle down to where it's suppose to be...the lowest idle i can get is approx 1800 rpm's...i can't find any vac leaks, etc....anything else i might have missed that will bring down the high idle?

[DarkHand]

i got the car running better than it has since i bought it...it idles very smoothly and revs like you'd expect but....

i can't get the idle down to where it's suppose to be...the lowest idle i can get is approx 1800 rpm's...i can't find any vac leaks, etc....anything else i might have missed that will bring down the high idle?

If it's capped, try uncapping the fast idle diaphragm, the black plastic module on the carb on the back left (when you're at the front of the car facing the firewall). I was stuck on fast idle the first time I devacced because of this. The car was in fast idle mode and couldn't kick down because the fast idle diaphragm couldn't move. Uncapping the ports allowed the diaphragm to move around and kick down.

Also check the idle speed at the idle control screw, as well as the tension of the throttle cable (there should be none, and lots of free slack. You should be able to move the cable around by about a half centimeter before it puts any pressure on the throttle at all).