Please some one give me an idea as to what is going on with my hybrid. I put a b16a in my 91 si hatchback, I have an ITR intake manifold, aem fuel rail,( which i bought to try to fix this problem) ported throttle body, and replaced the injectors. The issue is if i startout at a low rpm the engine will stumble a little till I get passed 3500 rpm and then the engine opens up and takes off, but if i start off over 2000 rpm it doesn't do it, I am lost, I checked for vacuum leaks and none. Help me out guys, me and a buddy worked on this all weekend to get the manifold and fuel rail in, and it does run better at higher rpm and hard launches, but slow take off sometimes makes the engine stumble.

 

this is becoming a increasing problem, i have it in my b16. Look for the post in hybrid about b16a hesitation problem.

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https://honda-tech.com/zerothread?id=50722


[Modified by elusiveracing23, 9:47 AM 7/16/2001]

 

Did you try the pull the o2 sensors thing? did it work? also some one else suggested putting new plugs and rotor and plug wires due to bad spark maybe, so i'll try them all and let me know if that worked for you.

 

Also change the fuel filter.

 

have not tried the o2 sensor thing yet because i dont want to see a c.e.l all day. the cap n rotor didnt do anything also same with teh wires. oh and i have a fuel pump too. and nothing.. its the cylinders running unevenly, thats it for sure


[Modified by elusiveracing23, 4:58 PM 7/16/2001]

 

I'm 100% sure it's a problem with one pair of cylinders leaning out to the point of detonation. I solved this problem temporarily by unplugging both O2 sensors; you can read about it in the Tech forum (too much typing!). HTH . Oh yeah, no CEL appeared no matter what I tried.

 

well i did the same and my car runs perfect now , i unplugged the only o2 sensor that was hooked up and ran it after resetting the ecu by pulling the negative on teh battery and its faster now, i can tell. We will see how bad my mpg is now . Oh well im happy for now

 

so it worked for both of you, perfect, i will go try it now, thanks for the information. You didn't get any check engine lights on, did it make your engien run rich or lean?

 

thats the only thing, both of us didnt get a cel, but! i do expect my mpg do go down a bit.. but hey, if thats what i have to endure in order for it to run correctly, ill do it

 

Cool it did work for me as well, I wounder if you get teh spoon or mugen program put onto an ecu, would it require the two sensor to be plugged in? If it does i wounder if this would start again or do you think the new programs will remedy this problem and keep the o2 sensors in place?