vestalfootball72

Car- 1994 Honda Civic SI
Motor- B20b low compression with ls intake manifold and obd1 ls distributor
Wiring- Stock SI harness (vtec and op are zip tied away)
ECU- Stock obd1 LS ecu
Problem- I will be driving along with my RPMS at say 1500. I give it some gas, and if i give it too much gas it will cut out/misfire sort of. This happens all the way till 3000rpms, and then it changes completely and runs perfect.

The swap was running completely fine, and i drove it from upstate NY down here to SC a few days ago (about 13 hours strait getting 36 mpg not one issue). I park the car for a day, start it up to move it and its doing this.

What ive done
Ive checked all grounds and redid my valvecover ground
popped off dizzy cap and it looks good

What Im thinking ill do
1. pull plugs when they cool down and check gap- any suggestions on what to gap them. I beleive i have them at .44
2. If that doesnt fix it, ill buy some new plugs
3. moving on, ill try a new cap and rotor
4. new plug wires?
5. ?

stratedrm

i have the same problem..

i have a 95 dx coupe
b20b / ls tranny and IM
obd2 ls ecu on an adapter

my motor was fine and only started doing it a few days ago... ive put around 3500 miles on the motor already though... i have new plugs, wires, cap, rotor, i tried 93 gas, i did a walbro 255 fuel pump.. still nothing.

stratedrm

do you have the IAC hooked up? any vacuum leaks?

vestalfootball72

haha were in the same boat!

I also tried 93 as i was worried bc the last fill it said contains ethanol lol

I talked with my dad who was a master tech for years and he said most likely my tb has a vacuum leak, possibly from teh change in climate- ima go try to fix that and ill brb in ten to report back

stratedrm

yea i have a plugged vacuum leak on my motor.. i also dont have anything hooked up to the iac valve... but it wasnt a problem until now.. its no hotter this week than it was for the past month though.

the only thing i know i need to do... is an oil change. that wouldnt even matter..

ill keep you posted if i can think of something

vestalfootball72

Im going to try a new TB gasket- i ended up having to make mine out of gasket maker bc i tried a few different OEM ones from honda and none fit?

vestalfootball72

- went for a drive today it was fine for 20 minutes. Then it started acting up below 3k. parked it for 15 minutes and now it was doing it the whole time?

ironcheftony

check for clogged fuel line, fuel rail, fuel injector filters

vestalfootball72

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ironcheftony &raquo;</TD></TR><TR><TD CLASS="quote">check for clogged fuel line, fuel rail, fuel injector filters</TD></TR></TABLE>

The fuel filter is questionable, as are my injectors. Ill see what i can do with those. Maybe a can of fuel injector cleaner? as well as replacing the fuel filter??

vestalfootball72

I also am having a VSS issue- its jumpy. could that be causing it?? I pulled plugs and there a tad lean, but one was corroded at the hex part where the ceramic goes to the hex part? could it be HG? i can start it with rad cap off and coolant doesnt fly, and it has no smoke at all...

vestalfootball72

alright, i just swapped in a new rotor and cap, as well as i took off all the grounds, and sanded them down with 120 so they are nice and shiny- took it for a ten minute drive and it was all good... so maybe its fixed?

stratedrm

hm. i'm going to go over everything tomorrow..

stratedrm

i did a throttle body gasket, intake manifold gasket.
i have new plugs and wires
i have a new rotor, msd external cap with blaster coil..

NOTHING.

i still have the misfire problem..

vestalfootball72

try a freinds distributor out- yours may have a bad ICM in it? if that doesnt work mayb its your HG? ive heard of that causing this

stratedrm

true.. i changed my plugs and saw oil around the threads... so i did a valve cover gasket.. thinkin it was the stem seals

what distributors will work for my ls head?

vestalfootball72

ls ones for obd1/2 and the stock b20 as well. obd1 and 2 are the same minus different plugs- you can solder the two together to make it work theres alot of charts online

Ge-money

make sure and check your grounds on the thermostat.. Had the same symptoms when i had a loose ground there. Felt as if it misfired when i floored it but would be fine if i slowly gave it gas...

vestalfootball72

thats what fixed my problem- well that or the new rotor and cap

stratedrm

i actually had to do my distributor the other day... and even with a brand new one.. i still have my misfire..

ive also installed a new cap, rotor, plugs and wires, IM and TB gaskets... i got nothing

Jabinya

If you guys are running a P75 stock ECU on a B20, you need a tune.