ok, to make a long story short, i blew my obd-2 motor. (btw: my car is a 92 civic vx hatch) one other thing, im using a obd-1 ecu I picked up a obd-1 longbloack and swapped the major differences between the motors(dizzy, injectors) I used my same skunk 2 intake, and used a lot of my old parts that i know work. I used the obd-2 wire harness, and everything plugged in fine. But when i went to start it, it runs like major ***, it bearly runs. The motor does have b16 cams, which i heard shouldn't effect the motor.
Here is the major sensor problem i noticed, the obd-1 motor does not have a crank sensor, and i thought the obd-1 ecu ust wouldn't look for that, but does that crank sensor tell the ecu the timing? I do have a obd-2 dizzy, which is a one plug, my question is: does the obd-1 ecu have the crank sensor built into it? is that why it has 2 plugs?? Im gonna check the cams and crank to check the actual timing, becasue is does seem like a timing problem, for sure. but if someone knows FOR SURE that my obd-2 wiring is looking for a crank sensor, tell me. remember im running a obd-1 ecu. I want definate answers, not someone saying they think it might be the crank sensor. Im also gonna check the compression on the motor.
One other thing, there are no check engine lights, i can rev it all the way up, and it revs up fast, its running on all 4 cylinders, it just can't stay ideling, and it runs really rough, like its one tooth of with the timing belt.
someone please help

 

ok, i did find out that the obd-2 motor has the crank sensor, and the obd-1 has it built into the dizzy. Now, is this what is causing my problem? If so, how hard is it to put a crank sensor on the block, or can i wire in a obd-1 ecu and repin it to fit my obd-2 wireharness, and then plug my crank sensor plug wires into the dizzy?? i don't want to have to go and buy a obd-1 wireharness, obd-1 ecu, obd-1 injectors, blah blah blah. Hopfully i can somehow just wire up the crank sensor on my new block, but if thats going to be a major pain in the ***, i don't want to mess with it.

 

ok, im making some way here. Here is the thing, a obd-2 ecu looks for both the dist. spinning, and the crank spinning, but im running a obd-1 ecu, and it only looks for the dist. spinning. so i don't need teh crank sensor to be plugged it.
SO! is must be a timing problem. The cams are 1992 obd-1 b16a jdm cams.And those should work fine in the motor, right? the dude that put the new cams in must have messed the timing up when he put the new cams in. he must have. I will keep this posted. But i bet when i look at the cams, they will be off a little.

 

At this rate you'll have it solved in no time!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">At this rate you'll have it solved in no time! </TD></TR></TABLE>
yeah, i want my car up and running again as soon as i can. I do lots of recearch also. I just couldn't find the info i was looking for, so i asked on here. but then i started to find what i needed.

 

The CKF sensor on the crank doesn't substitute for the CKP sensor in the distributor. The CKF sensor looks for speed fluctuations, to detect misfiring. I don't think the ECU uses the CKF for spark timing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">The CKF sensor on the crank doesn't substitute for the CKP sensor in the distributor. The CKF sensor looks for speed fluctuations, to detect misfiring. I don't think the ECU uses the CKF for spark timing.
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you nailed it perfect. tats extally what is does. The thing is, my obd-1 ecu doesn't even look for the CKF senor, so that can't messing anything up. If i has a obd-2 ecu running it, the car probably wouldn't even start, becasue the obd-2 ecu would see the dizzy turning, but not the crank, so it wouldn't let the car start or run for very long i would think. My best guess is that the timing belt is not on extally right, screwing up the timing and making it run so rough. I know its not some sensor messing it up, as im using all the same sensors and wiring that i used on my last motor, and it all worked perfectly fine.

 

Not trying to be an *** or anything, but check your plug wire to see if they are on right. If so, recheck all your sensors to make sure they are plugged in to the right spots, especially the IAC.

 

You're using an OBD-1 ECU but there's some OBD-2 stuff on the engine? Using an OBD-2 wiring harness...

It runs good but won't idle? I sorta remember OBD-1 & OBD-2 IAC valves are very different. But I'm not sure of the details.

OBD-1 & -2 distributors have the same sensors (CKP, CYP, TDC) but I don't know if maybe their signals are different? Even if their signals are the same, I bet they're pinned differently. I guess you'll want to double-check whether you've got something crossed by using OBD-2 wiring.

 

I switch an engine over to ODB2 using the same IAC and I didn't have any problems. I was using a JDM ECU though, but they are all basically OBD1's.

 

everyone, one quick note. almost everything on the motor now is obd-2, wire harness, and sensors (and dizzy and injectors) I am using all the same sensors off my old block hooked into the same wire harness, hooked into the same ecu(which i have ran on my old motor for like 2 years without any problems) plug wires are all fine. I still can't wait to go home this weekend to check the timing. Im hoping its the problem. and im using the same IAC i used before with my old set up, so it shouldn't be the problem either. its not that it just doesn't idel, it just runs really really rough too. Like a timing problem.
I know i don't have anything crossed, becasue its the exact set up as my old motor, i swapped all the sensors and everything. thats why its so weird. I talked to the dude i got my motor from, and he said it ran like crap for him once he put the b16 cams in. so im thinking he might have messed up the timing a little.