I have a d16a vtec...w/ a p28 and it runs soo badly. Super rich and rough as hell..ive taken essentially every step possible to ensure that this is NOT mechanical (diz, plugs, wires, seafoam, iacv,tps,map...i checked/ R&R'd them all...and i still get this very rich running rough little motor. Oh and I have a new o2 sensor....so, i heard that p28s run rich anyway...does anybody know of a chip/basemap that somebody just tuned a stock (bolt-ons) Z6 and made it run the best it could? I ask this bc tuning it myself would be A.hard bc i suck at it...and B. more costly than just buying a chip. Thanks

 

p28 is the native ecu for a z6 it should run perfectly as long as everything else is correct.. check everything again lol.

 

haha...well I dont know what else to do...im running so rich--what can I do? the motor has like 70k miles on it ...why would it be running so rough?

 

i should also add that it runs worse the hotter the engine gets

 

elaborate more on your engine setup...


D16a + vtec? mini-me? are you running a FPR or any sort of fuel management?

 

ah k..sorry

D16A is the stamp on the block...its essentially a sohc zc vtec. its out of like a jdm 94 civic ex...has higher comp. than a Z6 but is pretty much the same. Its obd1 and im running the obd1 injectors as well. Im not running an fpr or any type of fuel management...its a bone stock motor (intake, header, test pipe/2.25 exhaust. ) running a virgin p28 as of now.

 

oh, got ya.

lemme think about what it could be. i had a car running rich before, and it turned out the motor had the wrong type of spark plugs in it.

 

any insight by you, werkz, would be much appreciated!! my plugs are NGK's ..theyre the choice of most Dseries owners i believe. also i should add this little bit of info: when its idling..if you listen you can hear little like blips from the exhaust..like teeny little pops that happen pretty sparatically.

edit: I timed the motor too..most people say when the timing advanced you run closer to the lean side, well i advanced my timing and i did not see ANY results. the engine still ran the same.

 

what type of NGKs are they?

colder plugs could cause it to run rich.

 

theyre the Vpowers...just the standard like 4 bucks a piece ones...I gapped them as well

 

i would change the plugs. go to honda and get the ones specified for a D16z6.

they should be pretty cheap too.

 

alright ill try that...just to clafiry though--when i say rich like I probed my o2 sensor joints and was getting around 75+mvs...honda says anything over 60 is rich so am i like dangerously rich? haha

 

do you have proper fuel pressure? is there an aftermarket regulator on it?

 

no aftermarket reg...and yea we checked it

 

throwing any check engine lights? have you done a compression test, and checked for proper cam timing (timing belt wise)?

i hate it when cars dont run right..good luck

 

well...the only code is for the o2 heater which only would affect the cold start emmissions really...umm heres the strange bit..we did a compression test and i dont know what happened but i gave it four cranks and it read 70-75 on all cyls...haha i think if it were really that low it like wouldnt run..so im very confused about that. I also do not know how to check the cam timing...you think that could be a variable? thanks for all the replies!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Coltmorris &raquo;</TD></TR><TR><TD CLASS="quote">its a sohc zc vtec. </TD></TR></TABLE>

wtf? lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HamiltonRex &raquo;</TD></TR><TR><TD CLASS="quote">

wtf? lol </TD></TR></TABLE>

There was a SOHC ZC VTEC. It's an OBD1 motor.

 

wow, guess i learn something new everyday

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Coltmorris &raquo;</TD></TR><TR><TD CLASS="quote">well...the only code is for the o2 heater which only would affect the cold start emmissions really...umm heres the strange bit..we did a compression test and i dont know what happened but i gave it four cranks and it read 70-75 on all cyls...haha i think if it were really that low it like wouldnt run..!</TD></TR></TABLE>

Ok, fix the O2 and make sure u have no CEL. Regarding the compression, try a different gauge. Those numbers are pretty low. Also, dont forget to disable the injectors and hold the throttle wide open while u crank.

What map sensor are u running? Maybe post a pic of your engine bay just so we can see what we're working with here.

 

hmm..i forgot to hold it at WOT when it was cranked..that could be it. heres a pic

 

any other thoughts?

 

well, on the plus side, i dont think you have a lot to worry about as far as it being harmful. you're going to foul some plugs, but running too rich is a hell of a lot safer than running lean.
still sucks, but im just saying, i dont Think its going to damage anything.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Coltmorris &raquo;</TD></TR><TR><TD CLASS="quote"> when its idling..if you listen you can hear little like blips from the exhaust..like teeny little pops that happen pretty sparatically.</TD></TR></TABLE>

its misfiring, either because the plugs get fouled or something is wrong with the ign. system

ILBB

 

yea..well i check the plugs regularly and theyre carbon-free, the wires and dizzy and nearly brand new. and i timed the engine spot on, so what else could be wrong with the ign system?