Hondata

Im still having this issue and havent been able to drive the car for months. I have tried retarding and advancing the timing but it doesnt change the surging issue for better or worse.

Spunkster, i talked to the tuner a few times about this issue and he thought it looked like a vac leak and ...

Good thinking, thank you. I never had a vafc but i have replaced the connector so i did a test of the map sensor reading. I hooked up a vacuum gauge to the manifold and watched smanager display and at varying vacuum and throttle both the gauge and smanager read the same. I think that rules the map ...

Because he couldnt figure out what was going on when the car was in front of him, why would he have any idea over the phone?

You suggested it may be a vacuum leak which has nothing to do with the tune or tuner. If there is an engine related or hardware related problem it has nothing to do with the ...

I'm still having the same problem, ive tried replacing different ignition and fuel system parts and sent my injectors back to rc to be cleaned, nothing is helping. I first noticed the problem on the way to the tuner, i figured the problem was because it wasnt properly tuned yet. The tuner could not ...

Im still having the same problem weeks later. I have check thoroughly and there are no vac leaks. I thought my fuel pressure looked suspect so i replaced the fpr and the pressure looks good now but the problem still exists. I have checked for ignition problems but cant find anything wrong.

I have not talked to the tuner about it because i dont think the problem is his problem. Maybe im wrong but especially if its something like a vacuum leak it has nothing to do with him.

Thanks for your help! I tried to find a vacuum leak today, using propane and cant find any leaks.
Do you have any more ideas?

I'm having a problem with my car surging while I drive. Its very noticeable on the highway. It gets better when in closed loop but is still there. I have tried advancing timing, a little at a time with no success and adjusting fuel tables makes no difference.

the engine is a b18cr recently rebuilt ...