check engine light ?

[turbo_d15b]

okay so i went to the dyno shop yesterday. got the car on the dyno and they started to tune it with a VAFC. all the settings were correct and whatnot. when they turned the car off, it seemed to have reseted the APEXI VAFC? my check engine light was on? could this be the problem of the ECU restarting itself everytime i would turn the car off and then turn it back on?

 

they said that it could be the check engine light or the oxygen sensor. i went out and bought an oxygen sensor for it this morning and the light was still on? what is the problem? (92 civic vx w/JDM d15b)

[turbo_d15b]

will clearing out the code help anything at all? or will it clear out and come back again? im not sure b/c i have never seen anyone scan an OBD1 car before?

[cranny]

it sounds like , the constant power(memory power) , for your ecu is not correct. or a relay or somin , is causing your ecu's constant power supply to be cut. just pull the backup fuse under the hood dude for couple minutes , fire it back in. boom reset.

 

what ecu do you use to run that engine? should be a P08? and you really cant use any other ecu for this engine i assume solely cause of the 3 stage vtec. you know that V-AFC's are really not the way to go dude. who wired in the afc? is it wired up properly? the only thing that would make it not remember its settings is no constant power that i can think of.

[turbo_d15b]

i am running a p28 ECU....out of a 95 civic si? oh yeah, i got the VAFC b/c my car is turboed...i took the VAFC to a dyno shop and had them do it. but i just got my codes for my check engine light.

 

MAP SENSOR

SPOOL SOLENOID VALVE (don't know what this is? i am asumming that it is the v-tec itself?)

02 SENSOR

[turbo_d15b]

where is the backup ECU fuse located?

[cranny]

under hood fuse box. see heres what im saying , what year is that engine? if its a 3 stage vtec engine , they have 2 solenoids im pretty sure. now the P28 ecu , is only designed to control 1 solenoid. normally , one solenoid controls the oil flow to the VTEC pins , and once opened , pushes the pins out and locks all the rockers together. well in the 3 stage vtec , each intake valve , there being 2 for each cyl. of course , and one being almost round or no profile hardly like VTEC-E , can lock onto the VTEC rocker individually. so the first stage is each intake on its own lobe , one intake valve hardly opening. 2nd stage is the intake valve that was hardly opening locking to the VTEC rocker. the 3rd stage is the other intake valve locking onto the VTEC rocker.

 

so like i said , the P28 is only designed for 1 solenoid , the 3 stage VTEC D15B , has 2 , which is why they have a unique ECU to themselves. dude take some pics of under the hood , of everything.

[turbo_d15b]

under hood fuse box. see heres what im saying , what year is that engine? if its a 3 stage vtec engine , they have 2 solenoids im pretty sure. now the P28 ecu , is only designed to control 1 solenoid. normally , one solenoid controls the oil flow to the VTEC pins , and once opened , pushes the pins out and locks all the rockers together. well in the 3 stage vtec , each intake valve , there being 2 for each cyl. of course , and one being almost round or no profile hardly like VTEC-E , can lock onto the VTEC rocker individually. so the first stage is each intake on its own lobe , one intake valve hardly opening. 2nd stage is the intake valve that was hardly opening locking to the VTEC rocker. the 3rd stage is the other intake valve locking onto the VTEC rocker.

 

so like i said , the P28 is only designed for 1 solenoid , the 3 stage VTEC D15B , has 2 , which is why they have a unique ECU to themselves. dude take some pics of under the hood , of everything.

 

 

[turbo_d15b]

where is the other v-tec solenoid? i found the first one where it is usually located. so i will have to get a p08 ecu?

[cranny]

i dont think the OBD1 D15B's are 3 stage vtec , so if its an OBD1 engine , your good to go. you have electrical issues i think , cause the chances of your MAP , vtec solenoid , and O2 sensor going all the same time is pretty slim.

[CleanGSR]

I think it's the D15b7 that you're thinking of cranny. (not for sure though)

[cranny]

how do you mean hung? how am i thinking of the B7? i lost ya ol buddy , lol. it says D15B right on his valve cover. when i first learned of the 3 stage VTEC system , i thought it came in both 92-95 D15B's(OBD1) , and the 96-00 D15B's(OBD2). but it didnt come in the OBD1's. therefore , his car is fine with a P28. but i still think he has electrical prolems. take the VTEC solenoid apart , clean it out for craps and giggles. maybe someone you know has a car like yours? swap a couple sensors out and try it out after you reset it. if that dont work , come back. the fact your ecu and AFC are resetting everytime you turn car off tells me you have to have somin wired wrong , cause in almost any electronics like this in a car , even a head unit , theres constant and acc. power running to it. ive never wired a AFC in , but im guessing , it would prolly have either all 3 power sources , accessory , ignition , and constant , or ignition and constant. i dont think theres any wiring issues with your ecu , just the AFC , and the way thats making your car run after resetting might be throwing your MAP and 02 sensor codes. the solenoid code is a false code i assume.

[CleanGSR]

Settle down buddy. I'm just saying that (for some reason) I was thinking it was the B7 that had the 3 stage VTEC. Hence my "not for sure" comment.

[cranny]

settle down? what are you paranoid? haha. i wasnt upset not one bit dude , lol. the only 3 stage VTEC engine there is that i know of , is the OBD2 D15B. B7 is a united states domestic market engine. had to say it all out for once , lol.