I Have an STD

pissing me off. ive replaced everything, plugs, wires, cap, rotor, fuel filter, i have no cat, and the motor is fresh. its not the injectors, and the fuel pump is mint. you think its the coil? it only breaks up at like cruising pedal pressure, doesnt matter the rpm, just at like 1/4 throttle, btw, no CELs. help!!!


Brett

I Have an STD

bump

I Have an STD

come on, anyone?

Brett

Ransom

my friends did the same thing yours is doing...at full throttle its smooth...but when cruising itll miss a little bit...it was his timing

I Have an STD

what did he do to fix it? just rotate the dizzy?


Brett

Ransom

it wasnt his ingition timing it was his crank/cam timing...u might be off a tooth

I Have an STD

timing belt is brand new and dead on. the car hauls *** other than this little hiccup

Brett

Ransom

im not sure if the TPS would cause that to happen at 1/4 throttle but it could be coil also..only one way to find out, change it and let us know if it helped

rainforest

what ecu???

Dainbramage

I just got my b16a1/crx done 2 days ago and it is doing the same thing. I also replaced plugs and wires but havent done anything else.

japspecjohn

I just drove it and I didnt notice anything weird

I Have an STD

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rainforest &raquo;</TD></TR><TR><TD CLASS="quote">what ecu???</TD></TR></TABLE>

PR3, no codes. both o2 sensors wired, all injectors wired. think it could be the TPS? i have no clue


Brett

93H22ACX

my prelude use to do that too....but i rebuilt the engine and it hasnt happen since

you might want to replace or check your O2 sensor or reset your ECU and see if that helps any.

Jason kiDD

Usually part throttle break up is either two things, fuel related or ignition. Since you said you replaced most of your ignition components and would make sure you either get a high flow fuel pump or bump your FP up more..

jbscivichb92

i had a bad o2 sensor and my car did the same thing

Ransom

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jason kiDD &raquo;</TD></TR><TR><TD CLASS="quote">Usually part throttle break up is either two things, fuel related or ignition. Since you said you replaced most of your ignition components and would make sure you either get a high flow fuel pump or bump your FP up more.. </TD></TR></TABLE>
Could it be possible that hes running rich...Because when he says hes at WOT the miss isnt there?

Jason kiDD

Well if he is getting hesitation especially from 3 to 4k then its not a rich issue.. But I guess we have to wait from confirmation till he gets back..

roberev

I just put a B18B in my '94 Civic H-back CX. It has the same problem, but only when the engine is not fully warmed up. Once engine warms up, problem goes away; however, "Check Engine" light comes on at that point. Code is for bad O2 sensor. Replaced sensor, but problems (break up at 1/4 throttle and "check engine") remain. All ignition parts and fuel pump are new. What next to try?

Jason kiDD

Okay I already told ya'll what to do.. The reason why you get hesitation is because the pump is not flowing the right pressure at low Rpms hence why you get a slight bucking from 2k to 4k. You need to get a fuel pressure regulator and high flow fuel pump to negate this effect..

If you are is missing at high revs then usually its the ignitor in the distributor that is either bad or is not getting a clean connection..

I Have an STD

no, its not the fuel pump. the fuel pump is stock but flowing just fine. it has absolutly nothing to do with RPM, NOTHING. the car will do it from 1k all the way to 8k if you want it to. but ud have to be on it less than 1/4 throttle for it to do it. i know for a fact that the motor is running perfectly strong, i ran a 14.800 las night with a 2.26 60 foot and a 93 mph trap speed, so the car pulls perfectly. its just the very light throttle tha pisses me off. any other suggestions? the timing is advanced now, the fuel is good, and its got a nice hot spark. now what?


Brett

Jason kiDD

Again what is it hesitation/bucking at 1/4 throttle?! Or missing/break up?!

And if you are using your stock fuel pump then that is the problem right there. Get a walbro high flow. Trust me I had the same issues and until I changed out the fuel pump no matter what I did it was always there at part throttle. Stock pumps sometimes dont flow well at constant part throttle under load..

UltRaH22

fyi brett. . . chubbs blue crx w/ b16 ran 14.6 @ 96. .. . all over u

Nick M

Have you looked at the Map sensor?

Thats what it sounds like to me as a first guess.

Jason kiDD

If your map signal was off or vacumn hose loose your car would shut off completely at high RPM.. Been there done that already too..

Nick M

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jason kiDD &raquo;</TD></TR><TR><TD CLASS="quote">If your map signal was off or vacumn hose loose your car would shut off completely at high RPM.. Been there done that already too.. </TD></TR></TABLE>

No, thats not necessarily true.