To begin with, I have a 1993 VX hatch with a JDM GSR and integra OBD2 harness. When I did the swap, I didn't have an ECU so I used a P28 to get the car around for like 2 days. I then bought a JDM SiR(B16A) ECU from my buddy, VTEC hit at like 5,800 Rpm. I sourced a P72 and when VTEC hits at 4,500-4,800 it sputters till like 5,800 and then evens out till redline.
This happens with every GSR ECU. The CEL turns on. So I go to check it, and the CEL is unresponsive. I had three guy's check my car and the fcukin car does the same thing everytime. Has anybody ever had this problem? I got a couple of ideas/solutions to this problem:
- If i get an OBD1 harness, will that probably fix it?
-I also figured since OBD2 cars have the plug for the CEL reader, would the wires that send the info of CEL's to the ECU be on the drivers side. (Thats saying if thats how the ECU gets its codes or does the ECU send signals to every sensor, then relays the message by the CEL? Someone please help, I'm all out of ideas.
-From just at the top of you're head, would you say that its my 02 sensor, or something else keeping VTEC from hitting. Because it seem's the only thing wrong is the first stage VTEC, but I dont have the regular IM, i have a Skunk2 one. Thanks in advanced.

 

BUMP

 

I would say you need an ecu tune for the intake maniflod(and the other mods you have ), the gsr maniold has secondary that would probably take care of the sputtering, at the rpm you mentioned.


gl

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egsleepercivic &raquo;</TD></TR><TR><TD CLASS="quote">I would say you need an ecu tune for the intake maniflod(and the other mods you have ), the gsr maniold has secondary that would probably take care of the sputtering, at the rpm you mentioned.


gl </TD></TR></TABLE> Thanks man, I appreciate it. Finally someone gives me some feedback.


Anyone else?

 

TTT

 

I promise you that running the "OBD2" engine harness won't have any effect on an ECU flashing codes when you plug the two pin jumper under the dash to resd codes.

So let me get the straight:

The check engine light comes on randomly, right?

When you try to jump the ECU jumper to read the codes flashing the P72 gives off no codes, but the other ECUs you're trying do?

 

By the way the P72 and B16A (should say P30) computers look for an extra sensor that the P28 doesn't look for - the knock sensor.

Do you have the knock sensor wired up?

 

I thought OBD1 dont look for the knock sensor? Yeah, have a B16A P30 and a OBD1 P72.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_Frijoles &raquo;</TD></TR><TR><TD CLASS="quote">I thought OBD1 dont look for the knock sensor? Yeah, have a B16A P30 and a OBD1 P72.</TD></TR></TABLE>

Well the B18C1 and B16a engines have the knock sensor, and the P30 and P72 ECUs for them also look for the knock sensor.

A P28 ECU doesn't look for it, so you won't need to wire it up if you go rechipped P28.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">

Well the B18C1 and B16a engines have the knock sensor, and the P30 and P72 ECUs for them also look for the knock sensor.

A P28 ECU doesn't look for it, so you won't need to wire it up if you go rechipped P28.</TD></TR></TABLE> Give me a minute, Ima go outside and check and see if its connected.

 

Its the Green plug under the IM right? Yeah, its plugged in. But what would cause the CEL not to flash when the plug is jumped? The CEL turns on at 4,500. I'm stumped, idk what to do at this point. Ahhhhhh!!!!

 

The plug could be plugged in, sure, but is the WIRE pinned at the ECU? Look at that diagrapm and see if pin location D3 has a wire going into it.

Also do any of the other ECUs throw a code? Do they let you read the code?

VTEC kicks in at 4500rpm on a P73 ECU, so if the knock sensor isn't hooked up that could be part of that problem.

The bottom line would be to get a P28, have it rechipped, and see if the issues still persist.

 

Yeah, its there. Its a blue and yellow wire i think.

 

Bump, anyone else? What would cause a CEL from not responding when jumped.

 

 

Check your grounds and all the wiring from the distributor.

Have you checked the backup fuse for the ECU? that might be the reason why when you go to jump the codes; nothing shows up.

 

Checked all fuses. Haven't checked grounds, will do that tomorrow. It runs fine though with a P30. Its only through 4,500-6,000 where the troubles at. Will recheck everything.

 

I'm still confused about this topic.

The car runs fine with the P30, right?

If the car runs fine with the P30, but won't run fine or allow you to check codes with a P72 then why worry about running the car on a P72?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">I'm still confused about this topic.

The car runs fine with the P30, right?

If the car runs fine with the P30, but won't run fine or allow you to check codes with a P72 then why worry about running the car on a P72?</TD></TR></TABLE> If i run the car on a P30, won't that cause the car to run lean? And I'd like to figure out why VTEC isn't popping at it's RPM. Also, I'd like to figure out why its /sputtering/bogging at 4,500.

 

Man a direct answer of "yes the engine seems to run fine with the P30" would be much easier to understand.

If the car runs like *** and a check engine light pops up only on the P72, theh why worry about that ECU?

A P72 will run like crap on a GS-R engine with a Skunk2 manifold because the Skunk2 manifold likes a higher VTEC point and different a/f ratio tuning than the P72 provides. Honestly the P72 shouldn't throw a CEL just because of the Skunk2 manifold, but even if it does it shouldn't matter since the P72 is not the ECU you want to run.

I say rechip the P30 or buy a chipped P28 and have it tuned on a dyno.