Trying to troubleshoot bogging at low rpm that occurs randomly and not all the time.

The chassis is a 95 Honda civic hatch back cx model. It had a B16a before the b18c swap.

The motor currently in the vehicle is a B18c JDM motor black top.
The b18c came out of a 2000 Honda Civic SI, that was hooked up to a wire harness, and the ecu that was operating the motor was the JDM ECU that came with the motor and this was run through a conversion harness.

No bogging when the B18c was in the 2000 Honda Civic Si

No bogging when the B16a was in the 95 hatchback.

First place to start troubleshooting?

We have tried multiple Ecu's and also an apexi power fc.

 

CEL codes?

What specific ECU?

 

no CEL codes that I am aware of.

I have have to check to see what ECU's we used exactly. I know for sure one was a P73 JDM ECU

 

Does the CEL work?

 

yes

what are the chances it could be spark plugs/wires

 

How old are the plugs, wires, cap, and rotor?

Have you checked the ignition timing with a timing gun?

And post all the ECUs you've tried so far.

 

Plugs/Cap and Rotor are about 2-3 years old.

Have not checked timing with timing gun.

ECU that the b18c was running on when it was in the 2000 Honda civic coupe was a 37820-P72-013 972-102186.

We also plugged a OBD1 GSR JDM ecu into the civic hatch back and it drove really rough

and a apexi power fc this ecu runs well, but still has the low rpm stutter.

 

what would be the easiest method to start trouble shooting this issue?

 

Start here with the basics^

Inspect the ignition components. If fine, check the ignition timing.

 

the alternator makes a weird noise. could this cause some funny things to occur>?

 

Replace it before it seizes.

 

Try replacing the ICM in the distributor

 

How is your idle speed holding? Low rpm also?

 

just out of curiosity, at idle does it run fine, then bog until the IACV takes over? then it happens over and over again? Say, every 1-5 minutes? Does it hesitate and bog while driving (especially at a constant speed)?

 

Car idles fine.

The hatchback is a VX and i know that the alternators were different amperage in the VX models and the distributor plugs were different etc.

Would not having the correct powered amp cause random bogging issues.

 

Spark pluges, plug wires, new distributor, checked o2 sensor, Timing checked.

Fuel Filter to be changed soon.

When putting load on the motor and mashing the gas the car wants to bogg and stall out. If the pedal is gently pressed, the bogging is not a violent and once the rpms are over 3500~ the car revs pretty smooth.

With the apexi power fc, there is a misfire sound coming from the intake arm/intake manifold.

when switching out to a chipped ecu this misfire sound goes away. And there are slight pops out the back of the exhaust.

With the a chipped ecu in, when the car is reved up the idle becomes a little sloppy.

Have not run the EG with the JDM b18c ECU that came with the swap because the conversion harness was meant for the 00 civic coupe. Could the TPS sensor be position so only the ECU that was in the 00' coupe runs the car perfectly?

The EG ran perfectly fine with a b16a in before the swap, and the B18c gsr motor ran perfectly fine when it was in the 00 coupe before swapping to the EG.

 

What you describe, if you are using properly matched stock parts, almost always comes down to weak sparks. Do you have new spark wires on it now? Some aftermarket wires are really crappy and only last a few months.

Also are you trying to run a 1800 cc engine on an ECU set up for a 1600? I take it that you have never connected the "runs perfectly" ECU into this car.

Check (with key on but engine not running) that the TPS output is about 0.4 volts with throttle closed and increases as it opens. Some applications require swapping the two outside wires so that the voltage increases with opening the throttle not decreases.