Weird Dseries problem. Please help
 

I have a 91 CRX with 413,000 miles on it. D15 motor and 5-speed trans unsure of mileage. Has CAI, Header-back, new plugs, plug wires, fuel filter, O2 sensor had to be relocated to just in front of hollow cat. I get a very light white smoke from the exhaust pretty much always.

Here's the problem; I can start the car it will run fine, let it heat up, no problems. I turn the car off, and let it sit for 15 minutes or so and when I start the car back up it likes to briefly bog down or almost acts like it blows spark/misfires or something.

It doesnt last long. Sometimes it will be a few seconds sometimes several minutes before it straightens itself out.

Also, doesnt do it immediately upon restart. I normally have enough time to get out of the parking lot and get about a block before it does it.

If Its not under load (push clutch in/neutral) and I rev during this time it will rev up fine however If I were to try and hold rpm at a certain point it fluctuates.

If anyone has ideas about whats going on please help. This doesnt effect its ability to be driven or anything just annoying. Thanks

Re: Weird Dseries problem. Please help
 

Probably a problem related to the O2 sensor and the gutted cat. Gutted cats make for some interesting interactions with the O2 because of turbulence issues.

Re: Weird Dseries problem. Please help
 

Unplug the O2 sensor, let it throw a code, and drive it like that. The ECU will ignore the O2 sensor in this state. If it's all better, then the above theory is correct.