hey whats up, i have a 91 hatch, with a sohc ZC swap...buuuuuuut i had to leave it DPFI for a while (lost job, and no ecu) so anyways it is running really rough like maybe it has a vacuum leak somewhere??? i just wanted to get some feedback...im NOT throwing any CEL btw. i replaced the spark plugs, spark plug wires, both battery wires,intake manifold gasket and alternator....its reving about 1500 to 2200 rpms.. it would jump on its own..then it will just die....also when i try to rev it up, it will have poor throttle response. please let me know what you think

 

anyone???

 

Sounds like you may need to clean your FITV if it's loping up and down from 1500-2200 rpms. Here: https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/how-fix-fitv-its-easy-1-2-3-a-699787/

Read up!

 

im still DPFI , and i know that these dont have one, :/

 

try seafoaming your car.
Did it for me

 

ok thank you. ill give that a try...anyone else want to give some input?

 

try your ignition timing at the distributor. three 12mm bolts
slide it towards the firewall to retard and towards the front of the car to advance
replace all your vacuum hoses, 15 bucks max
the seafoam will help a lot and pinpoint the problem

 

also makes sure your idle is well adjusted. throttle cable should have good amount of play
the sticker under your hood will say where it's supose to be. and if its not too much. Do a valve job

 

thanks a lot! im going to look it over and test for the leak ...i already adjusted the timing, but ill look into that also.

 

vacuum leak is certainly a possibility.

I've experienced a couple other causes of the symptoms you describe:

idle air control valve - clean it out and make sure there is no air in the cooling system... which may require repeated drives to work out all the bubbles.

distributor - try a known good one.

 

i got it to stay on, running a lot better than before...it was a vacuum leak. it still revs up and down a little ...but i have to charge my battery and check for more leaks tomorrow ...ill keep you updated

 

my distributor is brand new btw....i need to get all the air out of my cooling system also

 

i have a clogged catalytic converter.... lol i drove it around and let it sit for a while...and looked at the cat...(glowing red and smoking slightly)...and i know its not running rich from spark because it was all replaced (distributor,wires,and plugs)..thank you all who have helped by responded back....ill keep you updated