scia220

swapped d15b in my 93 civic ex. have since done the spark plugs, , i connected the ground to the tranny, changed the cap and rotor, also changed fuel filter and cleaned vtec solenoid. Cant say there is no difference, its minimal. Still same thing, same rpm it cuts out. My mechanic told me that the fuel pressure regulator could be bad or i need a new and upgraded one, that it causes issues similar to my situation. Also the tps and and map sensor could be the issue but im not getting a cel. DOes that sound right about the what can be causing my issue? New dizzy as well from d16z6? I was going to get a new fpr but wanted your guys opinion first. I need to get it at least running right before i can get this thing boosted. help?

scia220

xci_ed6

Try revving at a stop, in neutral. See where the miss shows up.

Then try in first gear (so you w/in the speed limit), see where the issue is under load.

scia220

one vid is in neutral. i dnt have 2 sttep. the other is a first gear pull

LTCxD2B

What Ecu are u running and is it tuned ? And what type of d15b there are many .....

scia220

I have a chipped p28 ecu from phearable brand new with a basemap. never had any problems with the 6 other honda motors i had basemaps put on from them. Jdm d15b vtec obd1 not a stage 3 vtec or non vtec.

LTCxD2B

What r the specs on the Ecu like what's redline rpm supposed to be and when does vtec come in?

scia220

Vtec is set at 4800. Rev limit was 8000 rpm. I was thinking maybe my tach was off? idk. But that wouldn't explain the rev limit stopping at 4500 or so rpm at neutral. i installed a new vtec solenoid with gasket and did oil change. ima try again later and see what it does. idk if a faulty vtec solenoid would cause an issue like that.

scia220

Does the same thing. I think my tach is jus 1000 rpm late around vtec since it engages at 4j according to my tach. it does kinda stumble a little before vtec tho so ima try a new fpr.

Tony Tranz

just had this issue with a B18c jdm.. it was a poor ground wire. made a new and made sure it was in perfect contact on both ends.. just throwing it out there

scia220

I did have the ground to the tranny off since my car still started and ran. did connect it and still same problem. ill try. scraping the paint off where its connected to body and see what it does. I'm gonna make jy run for a tps and map sensor too. See if any of these things help. thank yu. ill update soon.

scia220

So, put another fpr, another map sensor, scraped the paint off where the ground was, took it for a spin, same thing. Idk where else to look. ima try a new ground wire to the valve cover then too.

hybridmiklo

Did this jdm d15b have 2 vtec solenoids on it when you got it?

scia220

no. only one.

scia220

I thought about maybe getting the injectors cleaned. Should i send them to a machine shop or something or would the injector cleaner from autozone work just as well? Just looking at other threads of people having the same problems with misfiring and injectors was another area that could cause this issue. They could maybe clogged. Thats about the only thing i havent done, unless my fuel pump is going out.

scia220

Ok so maybe i did something wrong here, my vtec didnt work and it kept throwing a vtec solenoid code, so i did the vtec bypass and it started working afterwards. Now, Some forums i see you're suppose to ground one of the wires here and i didnt ground any other wire and splicing a4 and d6, if i remember correctly those are the pins. Am i missing something there thats messing with my redline?

scia220

So i took the throttle body off, it was the dirtiest I've ever seen in my life. The gasket was broken and very brittle as well. Going to replace the gasket and clean very very well and reinstall. Inside the intake manifold it was black. Cleaned it a little. Gonna grab some carb cleaner and clean all of it as much as i can. I also got some injectors. Cleaned them.myself. Ran some carb cleaner through them about 6-7 times each. Gonna switch the ones in there for the ones i cleaned. Guess we'll see how it runs after i do all that to it.

holmesnmanny

Try a good known ecu, preferably a stock one.

scia220

Converted my old auto P28 to manual. Same thing when i plugged it in. no cel. misfire at 6000 or so. sluggish before vtec. Cleaned the crap out of my spare injectors. New o rings. Gonna put those on tonight. Cleaning the intake mani and throttle body made a difference but didnt fix the misfire at 6000k. figured if the intake was so dirty that the injectors are probably the same. Ill see when i take them off.