Ok well i have a 91 acura integra, recently replaced the motor with a b20b, and i pulled the spark plugs after a couple months and theyre white as christmas!! .....

Ok so i checked my injector wiring and the previous owner, switched the pigtails around... Lets say one is brown and black, and another red and yellow.... well the red and yellow pigtail would be connected to the brown and black wiring and vice versa...

So my question is, would this be the problem of running lean? The car idled normal at about 450 steadily, but i did notice slight hesitation at low acceleration, along with random bog and backfire after driving off for the first time of the car being started. after that first time it ran pretty normal.

All help is apreciated!!

 

I would rewire them and idling at 450 is low. Normal idle is 850rpm

 

is it the two wires or just 1 of the injector wires? meaning is it a brown and a different black wire or a brwn/blk wire. 1 wire of the injector is just 12v or whatever volts from the resistor box.

are you still running the stock pr4 ecu? if so that why its lean

 

In progress with the wiring

For example, one wire is yellow, and its connected to a blue wire pig tail. When the blue wire is supposed to be connected to the blue pig tail. I mean the grounds seem connected, its just the positives that are mixed.
And yes its a stock pr4, but ive been told by many that it will be lean, but not TOO lean. And at the moment, im TOO lean.


Thanks for the replys btw

 

Ok so i soldered the pigtails and the idle went up to about 600. So thats a better sign, now just have to drive around a lil bit to see if its still lean or not....
Still feel slight hesitation when accelerating, and this time it pops up randomly at about 4k..

 

What do you mean pops up?

 

Itll hesitate a lil at lowrpms, go normal, then random hesitation again, than normal. No CEL and the solders were good (been soldering for a while).

 

Check and make sure timing is at TDC. Make sure all grounds are good.

 

u still running the stock pr4 ecu thats meant for a ls and not a b20, which is probably why its lean.

as far as the injectors, it doesnt matter which wire goes where, power can go to either side

 

Missing the front ground that goes to the valve cover, i didnt think it was TOO inportant but dont hurt to try. And Timing will re check. Did it not too long ago but also dont hurt to check. Thanks

I kno it needs more fuel, but for how lean it is, it seems that there is another problem too.

2000 CRV:
From the HAYNES MANUAL: With regulator vacuum hose attached: 31-38 psi ::: With regulator vacuum hose disconnected: 40-47 psi.

1991 integra:
w/ vacuum connected = 31 - 36psi
w/ vacuum disconnected = 40 - 47psi

Looks similar

 

I have seen people use stock ls ecu's on b20 motors with no problem. I have also seen people with the same setup but have problems. I made a basemap for this one guy to run his b20 that had a stock ls ecu in it. Car ran like a champ afterwards.

 

Could just be coincidence from a problem with something else. But idk, still believe fuel isnt the issue for how lean it is. Right now im steering towards the oxygen sensor, not because its throwing a CEL, but because it seems as if its the oldest part on the car(sensor looks beat)

 

You have a CEL?

 

No i dont, but that dont mean a sensor may be acting up.