Ok so I have no idea what is going on with my car. One minute everything is fine, the next its all messed up. So today I go to pick up a friend so they can help me move some stuff from VA. The drive up to his house was normal and I never turned off my car. Picked him up and just driving and I notice that Im not hitting vtec...Well the same thing happened a couple of nights before but vtec finally came back for some reason. Very confusing to me. Anyways I keep driving and my car starts hesitating real bad. Starting in first it would hesitate too. I also know my car was running really rich because I heard backfire which I was never able to get with my WS2 EVER. It was real loud. The idle was going a little whack because it was rapidly moving up and down 200rpm.

So I get to my friends house in VA and I check my oil, which is full and I looked at the o2 sensor and the connector and its fine. The ride back to MD was the same crap as driving down to VA. But when I go in my friends house to use the bathroom (turned my car off for like 10 mins) and I leave to go back to my house, everything is normal again! Im hitting vtec and theres no hesitation or bogging. I still go to check my CEL and there is no plug to even check the CEL! I know of one CEL ive had before (Traction control- came on JDM P30 ECU) which comes on while Im driving which is no surprise to me. But I know theres a new one because the CEL comes on right as I turn on the car. I just drove my car to the gas station after it being off for a while and its having the same problem as before.

I just want to know if someone else has had this problem and they can confirm its a o2 sensor. I cant really touch the car ATM because its still hot ( just got home ). Maybe its just a loose connection or what not. I wouldn't be asking if I could check the CEL but I cant so if someone knows what wires to splice so I can check the CEL that would be good. Only reason I know about the traction control CEL is because back when I was a super noob at this my bf at the time checked it some way but since I dont talk to him now I cant figure out what he did. Please dont flame or spam I am just not in the mood today :\

Cars Past: JDM B16a OBD1, had little hesitating problems every so often but never enough to think something was wrong and it would only last a min, had the swap for about a year and a half.

 

The two service connector wires are colored Brown and Green/White. When you find them above the ECU (branching from main wire harness), splice the two wires together to pull the codes. Remember to unsplice them when done.

 

Thanks Ron I got the codes

3 Map
21 VTEC spool solenoid valve
23 Knock sensor
36 traction control
41 Primary oxygen sensor heater

So pretty much everything vtec needs to work is messed up...Now the question is why would all of these go bad at once? And why would it act fine one minute and bad the other? It really all just came out of no where...

 

Nice job. Now clear the ECU (pull 7.5A Back Up fuse for a few minutes and reinsert), and drive the car until the CEL comes on again. Then pull the codes again to see which ones repeat.

My initial guess is that codes 3 and 21 are the main causes of your problems, but see what codes repeat.

The knock sensor code is confusing to me if you have an OBDI ECU.

 

Ok so now my car acts normal again. Weird. Hit vtec alot, but had like a 5 minute drive. Checked the CEL and its 23 and 36 so Im not surprised about 36. Im still confused on why the car would act like that only sometimes. When I take a longer drive tonight Ill let you what the outcome of that is.

 

Clear the ECU again before you take the longer drive. I am confused about the knock sensor code because I didn't think that an OBDI ECU looked for a knock sensor. Maybe it's different for a JDM OBDI ECU?

 

Yes JDM P30 SIR ecu has knock sensor.

 

I suggest getting a chipped p28 with b16a specs and it will get rid of these two. and see from there which codes are left. I have to agree with ron that 21 will probably come back.

 

I read up on some site (http://hondaswap.com/reference-mater...pinouts-28667/) P30 ecu pin out that there is no connection on the p08 or p28 so maybe the P30 is an exception because its JDM? I mean it does have have a traction control CEL but yea ill def clear the ecu again before the longer drive and Ill let you know.

 

so you dont think its a o2 sensor problem at all?

 

from what I've experienced o2 sensor problems don't go away unless fixed. And ran like crap all the time except full throttle.

 

All OBD1 Vtec B-series ECUs look for a knock sensor doesn't matter if its JDM, USDM or otherwise. (this includes all OBD1 P30, P61 and P72 ECUs) SOHC OBD1 Vtec ECUs do not however look for a knock sensor. No OBD1 D or B series non vtec ECUs look for a knock sensor.

 

Thanks for the education. You are always a reliable source for information.