i just bought the car about 3 weeks ago. its a '94 civic hatch cx with a b16a2 and gsr tranny swap. definitely a plus. now for the downside, the wiring is a monster, and half the sensors werent even hooked up. nothing for vetc was wired in, vss and various others.

i've searched for the known problems. the surging... well i checked the iac and fitv for whatever. no luck. but not worried about the surging right now.

last friday night me and a buddy hooked up vtec. pulls strong and all that goodness. but shortly after all was wired in, the motor started bogging and jerking. like it was getting too much fuel, or like a new driver with a clutch, but happens whenever you try to keep a constant speed/RPM. but whenever you get on it, its fine, pulls hard and smooth.

checked the fuel pressure, was way high at 55psi, so lowered it to 38-40psi. still bogging. removed the map sensor maybe that was bad, no different. undid all the vtec we had, and still no improvment. check all the spark plugs, still good. timing seems to be fine, but dont have a light to check. ummm... butterfly isnt lose or anything.

i have no clue, and running out of ideas quickly. can someone help me out here? i'd greatly appreciate it.

 

Plugs, wires, cap, and rotor come to mind. Check those.

 

bumpness for some help

 

you said wiring was mess so clean it up. check your grounds, check for cels. check for sensors that not plug in.

 

yeah it WAS a mess. its cleaned up, and sensors replaced or put in. no CELs. come on, i know this much.

 

you said the you adjusted the fuel pressure to 38-40 with vac. hose disc. or wiht vac. connected? spec. 40-47 wit vac. disc. 30-37 with vac. conntected. this spec got nothing to do with your car prob. anyway check the tps and map see if that got switched? did you checked all the grounds.

 

well fuel was too high anyway. and that was with hose disconnected. will check back on that. the map sensor is where it is supposed to be as well as the tps.

and all grounds seem to be fine. will check back on those.

anything else that could be the culprit?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mario. &raquo;</TD></TR><TR><TD CLASS="quote">Plugs, wires, cap, and rotor come to mind. Check those. </TD></TR></TABLE>
Seriously I had the same issues with my B20/GSR and changing out above mentioned did wonders...

 

thanks, completely read over that/forgot.

and i just got my tax return so i know where that is going.

thanks guys. will post back later if i find no luck

 

alright kids.... new cap, rotor, plugs, and wires... it helped... a little. but didnt solve it. still kinda bogging bad. its like there is a dead spot in the throttle.

could it be the throttle body itself? had a few good friends that had problems similar, and swapped out throttle bodies, and all porbs fixed. possibility?

 

can you hear your fuel pump? the motor could be fucked and pumping out too much, maybe check your injectors.

 

fuel pump seems fine. i just restored an old mustang, so i know my mechanical problems. this has got me stumped. but then again new to fuel injection.

would injectors all the sudden go bad? as in i drove to a friends house, parked it, did some work, and went to drive it again and it was doing this crap. by the way, how do i check for bad injectors? look a certian way or anything?

and no, its isnt anything we did. we changed everything back, and removed anything we added, and still does it. even used seafoam and cleaned out the motor, and got nothing except running a bit smoother.

maybe the throttle body? yes? no? maybe?

thanks again.

 

bump before bed

 

anybody have any other ideas??

maybe the throttle body?

 

chane your fuel filter, then get a new ecu. see if that works

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ef_you_again &raquo;</TD></TR><TR><TD CLASS="quote">chane your fuel filter, then get a new ecu. see if that works</TD></TR></TABLE>
Don't get a new ecu get a buddies and see if it works and check the internals in your distributor and see if they are still within their service limits (coil...that kind of stuff).

 

yep fuel filter

 

my car is doing the same thing, runs great but when you try to hold an idle it feels like you completly let of the gas, it seem like a dead spot in the tps, but it dosen't do it all the time. I can't figure it out either.

 

by the way, 97 dx hatch B18c1

 

I've had 2 d series motors, both did the same thing. The first was a DX motor, and the second a SOHC Vtec. Cruise at 2000RPM and it starts to buck, especially low throttle slight uphill. I removed the tb, cleaned it all up, changed the gasket, plugged the FITV passages, and then cleaned out the PCV passages and replaced the valve. It went away for about 3 months and now it's back. It's weird because so much of the original parts were replaced in the swap, and chassis parts (ie fuel filter) were all serviced when I did the maintenance.

 

my del sol did the same thing when i swaped in a jdm b16. the motor ran fine unless u tried to go one stedy speed. then it would get all jerky and hate life. turns out the little plastic screw in the iac backed itself out. after i screwed that in it was good to go.

 

I was wondering if the piece on the bottom of the TB that coolant runs though should be hooked up? if so what does it do?

 

It doesn't have to be hooked up, but it HAS to be plugged up or else it causes a major air leak. That's your FITV. It makes your idle ridiculously high until the water temp closes it off.

****. I went through the whole process of cleaning the tb passages, checking the gasket, torquing the bolts down, and then cleaning the PCV. This time it didn't solve the problem.

If you ever solve your surging problem, please post up the solution.

 

problem fixed.... i'm a retard.

i did check all my sensors ect, but didnt look really close. turns out the tps was held on by the top screw. no bottom screw, so it was catching during that certian throttle postion and the ecu was confused.

but do check the fitv and iac. iac needs to be clean, and the fitv white plastic should be tightened down. if they get lose, idles like *****.

anyhow, good luck for the guys that have similiar probs, and for the guys that helped, thanks a lot i really appreciate it.