ok. just swapped a d16z6 into my 93 dx hatch. vtec is all wired in prior to the swap i did a mini me. so the z6 was running great. and i happend to have a d15b head layin around. so i dropped the D15B cam into the z6 after reading about rumors. THE CAM IS NOT THE SAME!!!! the car pulled awesome. (for a d series) power band was longer and alot more aggressive. it had the z6 low end torque. now. there is nothing, power nor torque untill 4000rpms. the car just hesitates, ,i cant really explaine it any better... wtf happened???? i am very confused. ANYBODY WITH ANY KIND OF HELP WOULD BE GREATLY APPRECIATED.

 

torque? d16z6? unheard of!

 

i was thinkin it may have jumped a tooth at first... but there is too much power for it to have done so.... maybe...

 

you know what i mean. if you rode in my car before and after.....

 

i have a d16y8 and when i cruise around town, i can press the gas and it feels like a sligh clutch kinda feeling...

 

yea. if im cruisin, i can be in 3rd, doing 30, push the peddle and the car gets louder, but moves like dick. it was so much better before, even right after the cam went in. i dont understand. im gonna go drive it again. maybe ill have a better description.

 

its not clutch slipping.

 

ok. the drop out had a bad o2 sensor. its been throwing code 41, o2 sensor. it ran fine before i put the d15b cam in. just after it ran great as well. pulled all the way through. could it be that it fouled out the o2 sensor and now it runs like ****????

 

probley goin to be the cam z6 engines tend to like that stock cams i put a y8 head on min and a z6 cam and it didnt pull for **** so put the y8 cam back in and it pulled fine if u want to use that cam i have somebody tune it or find somebody to degree the cam with adjustable cam gear

 

tune get a chipped ecu and tune it turn the o2 sensor off and try it

 

Makes sense. I do not understand how it ran really good for about an hour. After that it fell flat on its face.

 

turn the o2 off? thats a genius idea.

op, does the car stumble or sputter at all? or it just magically has no low end power? it seems to me that stock p28 ecu's make for no low end power whatsoever whenever i've used them.

 

I would say yes it sort of stumbles. I mean there is low end, just no where near where it should be.

 

i could believe this... but i think what you all are missing is the fact that it DID run good. ran just like a z6 with a lil more power. im really starting to think about this o2 sensor. maybe it being heated has something to so with it. i just drove home and it ran good again... untill it warmed up. then came the hesitation.

 

i used to have that problem when i had a stock p28 on a d16y8. those ecu's are really sensitive to engine changes

 

update. just drove the car from a cold start. rand great... no need to beat it. then it hit operating temp. all gone. i need to floor it to move on anything under 4000rpms. i dont think its the ecu because i did a d15b mini me before. and it had the same problem. with a po8

 

Its probably either a failing O2 sensor or a Engine Coolant Temp sensor issue which retards the timing based on your engine temp. Are you sure your gauge is working properly? And do you have any CEL's?
Don't listen to the other people in this thread, turning off the O2 sensor is ****ing stupid. And P28's have nothing to do with no low end torque.

 

first thought was maybe the high lift rockers were staying locked.......but since you say its temp related then im gonna go with jimster here............ECT or O2 issue. a thermostat is quick, cheap, and easy...and it eliminates a possibility. a coolant flush at that time is probably a good idea too(again cheap and easy). does the heater get good and hot?

 

Finally a nice reply in this thread! These other people saying a P28 is to blame, to unplug the 02 Sensor. Please go home and stop spreading bullshit.

 

i did a tstat yesterday just befor the cam swap. the ect would make sense. but it seems like it had something to do with the cam swap. i did the tstat shortly befor the cam so mabey the guy did that to keep the motor running cool before i picked it up. if anybody else has anything good. throw it up. thanks guys. btw. cel is 41. o2 sensor.

 

i got an 02 sensor, because it threw code 41. buuuut i havnt put it on yet because the old one is in the header pretty good. lol ill jack it up soon. as far as the ect sensor, isnt there a cel code for that??? its ONLY throwing 41. and im quite positive the quage is working properly. not exactly sure how to check it tho.

 

new tstat. coolant flush. and yes it does.

 

hmmm. brainfart. the ECT sensor... doesnt it retard the timing BEFORE the engine reaches operating temp???? i dont understand why it would run better before it heats up then? and the fact that it randomly happened. im not sure on a price for one.... but im not sure if im willing to dish out the money to make a trial run. how do i test it?

 

im tellin u my d16 did the same **** i turbo mine tho socket the ecu and get it tuned for the cam and set up u wont but i found the best thing to do is go b seris thou stock ecus are funny they run fine when cold cause the ecu tell the engine to do something diff

 

I am unsure of what it does before the engine is hot. If anything it would advance it so that it heats up faster. But I know if it thinks your motor is running too hot or its disconnected you get retarded timing.