I just got done with a B16A block with a full B18C1 head swap in my 93 Integra. Ive noticed that when I give it part throttle at anything above 2800 RPM the engine will surge. If you hold the pedal completly still, you can feel a surge in power off and on. Its very annoying and I fear part of a bigger problem.

Its NOT so bad as to make the car buck wildly, or make the tach jump erratically, either. I have no check engine lights, and I get decent gas mileage (when im not getting into it).

The plugs are NGK, the wires are stock and new, and the dizzy is from an LS, with new cap and rotor. Fuel filter is about 2,000 miles old. The wiriing was done by professionals which I trust very much.

The car doesnt act up unless its at part throttle. At WOT the car pulls cleanly and has good linear power delivery. Im running about 93 octane (used the tuluene trick) and I have a knock sensor as well. Any help would be appreciated.

Also, this may not be related, but when I let off the throttle it takes a few seconds for the engine to "kick down" if that makes any sense. In other words, when I let off the throttle, a few seconds later, the car ACTS like I let off the throttle.

 

bump for educated repsonses.

 

man I got the same prob. mine started actin up after a car wash, so ignition right? nope. new distributor, plugs and wires, same problem. though it's not quite as bad, and only upon startup and shortly thereafter. once i drive it a bit the hesitation goes away. i get great mpg (38-40 mpg) and otherwise no problems. no CEL either. I'm at a loss.

 

I dont know, but I think im going to have to get a new dizzy to make sure that mine isnt acting up. Also, are the TPS the same for all b-series?

 

hey! what's up ? haven't talked to you in quite a while....

Anyway, now that that's out of the way, to get on to your question.

I wouldn't be so quick to jump to conclusions and replace dist.

when you say at part throttle, the engine surges a bit. if so, what's "a bit"?

have you made any changes to engine since last we talked?

what is your idle speed set to? has it changed since last time set?

Just asking to get a little more info to help you out ...

 

Hey, tim. I was actually going to call you this weekend to ask about a hondata install and tune price. I think that may be attributing to my surge (using an ecu setup for a 10:1 engine)

Nothing has changed since you last saw the car, idle is steady at about 800RPM.

The engine surges almost like a detonation at closed loop operation. Anything over the initial throttle tip in and its fine. It feels like maybe a vacuum line, but I checked those, plus, its not affecting the idle.

The reason I was going to replace the dist. was becuase its an LS unit, and only one bolt lines up (even though most people say two line up). I was fearing that at higher RPM and large throttle openings, the dist. may be twisting and throwing off my timing. I know that wouldnt account for the surging at part throttle only, but its a concern none-the-less. Hows the business? Taking off I hope.

 

dang tim, where are you when I need you?

 

sorry so long to reply. we've been busy here so haven't had much time at all for honda-tech questions and replies. If you haven't found a cure yet, give me a call... We'll find the problem. Again, sorry for not replying quickly, just been overwhelmed here.

 

mauahaha, I knew that would get you to respond!. I think its time for a new 02 sensor. But, no CEL yet, so its still up in the air.

Glad to hear you're busy, thats a good sign.

 

I think the problem is the Crower 404s you haven't sent me yet. Lazy ***!

Anyway, talk to Hung if you want a distributor. He probably still has the B16 distributor, and I'm sure you can swap over you ignitor to fix it. Then you can use all 3 bolts!

Might also be a problem in you Hondata program.

 

Im so lazy, but Im also so busy. The hondata isnt installed on the new engine yet, I think its the 02 sensor (my gas mileage is starting to decrease) I have to re-package the 404's so they can ship them (yes, I did try and ship them already)

I forgot to secure the cams, I just wrapped them with towells untill they couldnt move. I actually have to secure them with something.

 

Just making sure you haven't forgotten. And it's impossible for you to busier than me, cause I do jack **** all day.

Go to Oreilly and get an O2 sensor. My car had the same problem after I did my header install (I think I dropped the O2 sensor). I replaced it long ago and now it's all better. It was around $80 for a Bosch 02 with the factory replacement harness...

 

I dont forget. Im going to hold off on the 02 sensor and send out the cams with packing from the depths of hell. I have to get up to bills performance and get them to take the ti-retainers out and all that, but I can't do it untill after the 23rd though, I will be blind untill then. I have to take out my contacts (read-legally blind) for a week before I get lasik, then ill be blurry for about 3 days to a week afterwards. But, its big news, im not going to be blind as hell anymore. Rock on.

 

Back to the problem, check tps voltage (.45-4.5) and map sensor voltage.
Yes you can use any tps pretty much, if you need a replacement you can get the one out of a 929rr.

edit:check timing too since you are at it

 

map sensor is fine, Timing was just checked, 16 degrees. I may go up to 18 degrees. Im leaning towards the dizzy or the 02 or MAYBE some fuel map quirks with the P72 ECU.