raverx3m

iTrader: (1)

I had a problem with power loss around 2000-3500 on b16 motor that I thought was related to injectors or intake manifold. couldn't figure out.

timing was good
new NTK primary O2 sensor
spark plugs new
fuel filter new
good coil good wires everything clean good compression
no vacuum leaks. couldn't find any exhaust leaks either
vtec was good
fuel pressure was at 46psi( which is oem for b16)
I used d16y8 injectors since they have same part number as b16a2

the right set of sparkplugs is what came out of the b16

during the power loss the ultragauge would show the stock O2 voltage drop from 0.9 to 0.3 or 0.1 or so and then go back to normal


stock ecu stock engine ebay header and exhaust


put the original gsr motor back in it today
went for a test drive it sounds great and "pulls hard" lol

everything was cool until I decided to pull the plugs on this one also.
turns out they look same as the b16 ones only after about an hour of driving around.
no smoke engine is fresh rebuilt with everything new.

its a stock gsr motor obd2b ecu with same boltons

im puzzled why its still running lean

heres the plugs
left gsr right b16

raverx3m

iTrader: (1)

How often fo new sensors go bad?

raverx3m

iTrader: (1)

I had a brand new denso O2 sensor laying around so I tried that. didn't help...

if it was an exhaust leak the o2 would give a false lean condition and ecu would add fuel so the spark plugs would show too much fuel correct?

and a failing ignitor or coil would not burn fuel properly giving a false too rich reading to o2 sensor and decrease fuel
am I on the right track here?

Flr Power

Right, except for the igniter; A failing igniter will give you a false lean reading since it would intermittently cause misfires. So the ECU would add fuel...

raverx3m

iTrader: (1)

misfire would cause dtc or at least a pending code i had no codes related to dtc at all.
Ot with b16 or gsr.
Both are obd2 and i have scangauge hooked up with alarm for dtc

The only signs of lean are engine stumble and o2 voltage drop


And also now it cranks about twice as long as it used to

If i remember thats a sure sign of coil getting weak before it completely dies right?
I never had a failing coIl. Just had one sudden death once.

Flr Power

Could be a lot of things. You going to have to start digging at it.

raverx3m

iTrader: (1)

that's what ive been doing for last 6 months im running out of ideas I test and test everything but all the parts test good
anyone can give me options to test for electrical problems?

Flr Power

Did you try a good known ECU?

raverx3m

iTrader: (1)

yes

raverx3m

iTrader: (1)

Im checking everything but havent found ****.
I tried different coil tried different fuel pressure serrings

with a wideband hooked up i see that lean spots actually come and go between 2500-3590 rpm its not one big lean spot as i thought before.

Can anyone throw me some more ideas what type of electrical issue would cause this

Rtype16

What does the wideband read? What type of gas are you running in the car? How long has the gas been sitting? What is fuel pressure under load? Have you tried changing the fuel filter? Check the fuel pump?

raverx3m

iTrader: (1)

fuel filter new as I said in first post

fuel pressure seems to read good wideband reads between 15-15.5 and I can feel the dip when it goes lean sometimes barely sometimes pretty noticeable. mostly on light acceleration

Rtype16

Are your grounds good? Is the ground from the trans to the chassis in place? Bad grounds can sometimes cause problems.

What are you using that is the same between your two motor swaps? for example dizzy or something else...

Flr Power

Is it hard to restart when hot?

raverx3m

iTrader: (1)

nope its not showing any signs that I can pick on ive been checking temps etc

as far as I can see/hear everything else seems normal but like always it sprobably something stupid and hidden

same:dizzy(different coil), plug wires, fpr, pump, and wire harness

Rtype16

I would start by checking all the parts that are common between the two setups. It doesn't sound like it is the motor. The same problem on both engines would be highly unlikely unless you assembled two motors incorrectly., but than again it would be cam timing or something.

Do you relocate the battery or have you checked the grounds? How many grounds from the battery do you have and where are the located?

LTCxD2B

15.5 to 1 is too lean .... 10:1 compression in my car stumbles at this ratio ... Also a stock Ecu won't compensate for watever intake ur using cold or short ram is not stock air flow

Flr Power

Yes I agree with that. Richen it up to see if it makes any difference... I have seen lean stumble at that AFR ratio.

raverx3m

iTrader: (1)

does anyone read at all? I answered like 5 questions already that are in the original post or in my replies.

noodels

what sort of gauge are you using and is it you taking into account atmospheric pressure.
try putting the oem FPR back mine is running much better<though still rich>than the AEM i been playing around with.
gsr type<b18c4>
sk2 tuner stage 1 cams/sk2 inlet/4-2-1 dc header.
i do need to get a tuner to sort of the fuel/ignition tables...

raverx3m

iTrader: (1)

I cant locate a gsr fpr anywhere all I have is ls and b16 which are lower pressure than gsr

correct me if im wrong
bad fuel pump would run lean at high rpm mine runs a bit rich in open loop


can it be that when fuel pressure is too high the ecu would overcompensate and eventually fluctuate during acceleration since theres a quick change in fuel

so it would either cut fuel by certain percentage based on the ecu programing or increase it. and with higher pressure both parameters would be too much change so it would fluctuate?

Rtype16

The change in fuel pressure from the different ones wont cause that much of a problem. Did you have this problem before when you had the GSR motor in the car since you say you put it back in. What have you changed since then? Are you running a Cat?

GSR fuel pressure should be around 47-55 with the hose disconnected. The factory computer should be able to make up for the difference with your being at 46 lower end of the scale, but still may run lean. Also another weird issue that I have seen before does your fuel rail still have the pulse dampener on it. It will look like a little mushroom thing where your fuel line connects. I have seen some issues of running lean due to this not being installed.

The dizzy you are running is it a stock Honda piece or ebay crap? I know you say they are good, but try swapping coils, wires, cap, rotor.

Also one piece of advice you are coming on a forum asking for help diagnosing your problem. Not the greatest to get mad at people.

noodels

should have cleaned the spark plugs before running the engine,they have lots of carbon on them to get a true reading tbh

raverx3m

iTrader: (1)

Im not mad but for gods sake can people read?

Im not really making progress if i have to answer same questions over and over again.


Its an oem gsr dizzy

But ill repeat again
New plugs
new fuel filter
New coil
New denso o2 sensor

Rtype16

Cap? Rotor? Cat? Stock ECU but which one? Pulse Dampener?