Hello,

i've been scanning the faqs and allot of my other questions have been answered except this one.

I acquired a 90 Crx si with a single cam ZC swap, it has a header and full exhaust, i changed all the hoses and put a stock air box on, changed the o2 sensor and plugs. the car is running rich as hell and the check engine light will not go off so i was wondering if the right ecu is in it, it has a PM6. if this is not the problem would anyone have some suggestions as to what else could be causing these problems?

Thank you.

 

if you look at the ecu, it will blink a number of times. count the blinks. look up the code it gives you (ie. the number of blinks)

deal with the problem from there.

 

thanks i'll check that out.

 

check the code stated about if you dont knwmo how to read the code let us know how many blinks you see if threr short or long blinks

 

I checked the ecu this morning before work and it's not blinking at all. any suggestions?

 

but you have a CEL?

i believe thats a bad ECU

 

He's using an OBD1 ECU isnt he? There isn't going to be a light on it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bejita &raquo;</TD></TR><TR><TD CLASS="quote">He's using an OBD1 ECU isnt he? There isn't going to be a light on it.</TD></TR></TABLE>

Should still be OBD0 if it's a SOHC ZC. OP, this is a really dumb question, but have you tried looking at the code when your car is running or resetting the ECU?

 

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

Should still be OBD0 if it's a SOHC ZC. OP, this is a really dumb question, but have you tried looking at the code when your car is running or resetting the ECU?</TD></TR></TABLE>

not a dumb question at all, I've tried resetting the ecu and nothing. I pulled the ecu out and left it out all night. when I started it up this morning I checked the ecu to see if a light came on and nothing. the check engine light comes on immediatly when the car is started.

 

Check to see if there is a code when the car is not running, just turn it to the on position

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Zaakro &raquo;</TD></TR><TR><TD CLASS="quote">Check to see if there is a code when the car is not running, just turn it to the on position </TD></TR></TABLE>

just tried that and nothing.

 

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

just tried that and nothing.</TD></TR></TABLE>

OK, try a different ECU.

 

pm6 is not the correct ecu for a zc motor. you need an pg7. I have one for sale. let me know whats up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tomdata &raquo;</TD></TR><TR><TD CLASS="quote">pm6 is not the correct ecu for a zc motor. you need an pg7. I have one for sale. let me know whats up.</TD></TR></TABLE>

This isn't true. A PM6 will run a OBD0 ZC motor DOHC or SOHC just fine. I know because it's the one that I use on my DOHC. The PG7 works fine as well, it raises the redline and has more aggressive fuel maps than the PM6, but it makes the car run rich. The PM7 is technically the "correct" ECU to use for the ZC swaps as they keep the more aggressive characteristics of the PG7 but don't cause the rich situation, but they are hard to find.

So, any of the three will run a ZC motor, you need to do your reserach .

 

I just pulled a PG7 out of a stock 1989 integra last week that is the origional ecu for the zc engine. Don't know what wiZCo is talking about. PG7= USDM D16Dohc from 1988-1989 integra. PM7= JDM D16Dohc from JDM EF CRX. Basically they are exactly the same. PG7 will not make the car run rich.

look at this link.

http://www.hondata.com/techecuid.html

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tomdata &raquo;</TD></TR><TR><TD CLASS="quote">I just pulled a PG7 out of a stock 1989 integra last week that is the origional ecu for the zc engine. Don't know what wiZCo is talking about. PG7= USDM D16Dohc from 1988-1989 integra. PM7= JDM D16Dohc from JDM EF CRX. Basically they are exactly the same. PG7 will not make the car run rich.

look at this link.

http://www.hondata.com/techecuid.html</TD></TR></TABLE>

I don't know what you misunderstood from my post. The PG7 is the original ECU for a D16A1, which is *not* a DOHC ZC, so no they are not basically the same. The PM7 is the 'stock' ECU for that motor. I was correcting your post that said that the PM6 will not work with a ZC motor, and you were wrong. And I've ran a PG7 before, I got around 28MPG on average, strong fuel smell from the exhaust. I switched back to the PM6 and my fuel economy is back to 32MPG, around where it was when I had a D16A6, so yes, the PG7 runs richer than a PM6. This is the general consensus of the fine peope at The ZC Resource as well, so again, you need to do your research.

 

did you look at the link. I don't know what you are trippin on wiZCo. The PG7 is for a dual cam 1.6. It is what came in the US cars. the 88&89 integras. it is perfect for any obd0 zc engine. as long as you are runing electronic advance ignition. As far as the general consensus goes.. what else is new.. the general consenses on here is wrong 90 percent of the time. Please wiZCo so you are not confused for your entire life, spend some time reading the following links. Do not just skim them. actually read them so you can longer be confused.

http://www.hondata.com/techclosed.html

http://www.hondata.com/techecuid.html

 

OK, obviously you are confused. You originally said:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tomdata &raquo;</TD></TR><TR><TD CLASS="quote">pm6 is not the correct ecu for a zc motor. you need an pg7. I have one for sale. let me know whats up.</TD></TR></TABLE>

I am telling you your info is incorrect. A PM6 will work just fine. A PG7 will work just fine. A PM7 is the best option as it came from the cars equipped with JDM DOHC ZCs, has similar fuel maps to the PG7 but doesn't run as rich. This is also the general consensus of The ZC Resource, not H-T.

I am also telling you that the PG7 comes off a USDM Integra motor, but the D16A1 that it comes from is ****not**** a DOHC ZC, so there will be differences in the ECUs.

Your links give me ECU codes for different ECUs... codes that I already knew. There is also one about how ECUs operate..... awesome? I really don't care how much you know about tuning, etc. I'm just clearing up the incorrect comment that you added to this thread about:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tomdata &raquo;</TD></TR><TR><TD CLASS="quote">pm6 is not the correct ecu for a zc motor. you need an pg7.</TD></TR></TABLE>

If you would like to continue this discussion further you can PM me so we aren't chewing up this guy's thread anymore. There are no hard feelings here, I'm just correcting your mistake.

 

Thanks for all the input guys, i borrowed a working pm6 today and its running better but the cel is still on and i'm getting a 3 short blink code on the ecu. i didn't see anything in the faqs for codes.

thanks again.