skater722

So about a week ago I bought this 94 civic ex with a B20b Swap, not sure what tranny it is but its a type R tranny with a stage two clutch if that matters to what im about to explain. Anyway, My car keeps miss firing every time i try to smash to get going as if im going to race someone. or if im between 1500 to 3200 RPM's it miss fires a bit. We've adjusted the timing. New spark plugs, wires, cap and rotor. Valve cover gaskets, and were about to do the fuel filter but i dont know whats causing this miss fire. i was told that my engine is just ment to drive at high RPM's but this isnt normal for a car at all.

ECU:
P74/75: 92-95 OBD-1 Integra LS/GS
P75: 96-00 OBD-2 Integra LS/GS

Non Vtech

skater722

Any ideas what could be causing it to miss fire?

BraveHeartSOHC

How badly is it mis firing? Is it what could be described as "cutting out" just having no go at all and hesitating?

skater722

From start til about 3000 RPM's it feels like it miss fires almost as if its not getting enough fuel at first. i cant just go right away i have to ease into 3000 rpm's or it will mis fire and feel like its putting. when im idling it miss's a few times here and there and idles really low.

BraveHeartSOHC

There could easily be something wrong with your fueling/ignition calculation. So that would involve MAP/TPS/(CPS inside the dizzy) and ECU. I've seen the MAP and TPS plugs being switched and causing the same exact issue you're having. Try switching them around? If the same result, the TPS itsself could be bad.

skater722

where is the TPS? I'm really new to honda's which is why im having such difficulties figuring this all out.

BraveHeartSOHC

TPS is going to be the sensor on the side of the throttle body closest to the firewall. MAP sensor is going to be the one on top of the throttle body. Go out and see if you can switch the plug connectors around and see what happens. If it fixes your problem then BAM! If not, you can try replacing the TPS. The best way to do that is to take off the throttle body and get a die cutter an cut slots in the screws and use a flat head to get the screws out. You'll see why I say that when you see the screws holding the TPS on.

skater722

Is that the sensor that if i unplug it wont run at all? it has this cap thing that can be removed and lets air out of? or is that an egr valve?

JuggerNaut-CTR

There is no egr valve...how about just looking up (tps sensor b20b location)? There are stickies and tuturials on anything you need to find or do all over the place. Start googling things.

Is there a cel?

Where was the timing adjusted to?

BraveHeartSOHC

You're probably messing with the FIAV. The TPS is directly across from where the throttle cable connects to the throttle plate.



Its right there. (when you unplug it, it shouldn't look like that, that one is messed up).

BraveHeartSOHC

I was trying to be nice but I wasn't sure of how this forum felt about being that blunt. Guess I should go and actually read the guidelines and community rules.

skater722

Alright i found the two and im about to switch them to see how that works. Im pretty sure they both are in the correct spots though. and im not totally sure what the timing was adjusted to. my dad has a friend that works on hondas and he adjusted my timing for me. but what he did didnt help the misfiring

skater722

You guys can be blunt as possible. I'm not super smart with cars. I'm just learning and getting into the honda game so bare with me and sorry for my stupidity lol.

skater722

So switching them did not help at all. the cord from the tps sensor would not reach to the map sensor it was a little to short. but as i was looking around the block i found a sensor to the right of the oil filter that could possibly be leaking oil. what sensor is to the right of the oil filter if your looking straight at the engine.

BraveHeartSOHC

Probably just the oil pressure switch. If not that, I'm not sure about B20s but it could be a knock sensor.

skater722

Can an oil pressure switch leak oil or would that most likely be my oil filter?
anything else to check for the misfiring? could it be the ls ecu im using?

BraveHeartSOHC

If switching the connectors had no effect then I would look more towards physical timing. Is that what you had adjusted? Or did they adjust the distributor timing?

skater722

He adjusted the timing on both i believe. he told me my car is just supposed to be driven at high RPM's but that doesnt explain why that'd make me misfire

BraveHeartSOHC

Bad physical timing will mess your whole day up. He might be referring to the fact that there is a set of heavy performance cams in it. You should find out if there are, but it wouldn't cause a "misfire" it would make your idle lopey and your power band will just be moved up in RPMs

skater722

it idles really rough. sound like it kind of misses almost. how would i find out if i have heavy performance cams? i just bought the car so i dont know to much.

up until 3000 rpms i feel sluggish and my car puts and you can feel it really bad. could the cams cause that?