jm2000turbo

About a year ago, I purchased a 93 civic si hatch that had a d15b vtec with a turbo kit. I have a 2000 civic dx which i swapped this d15b into. I've done all the necessary changes to my engine harness and i used a obd2b to obd1 jumper harness. The engine was running 450cc low-impedence injectors with a resistor box. i changed the injectors to 440cc which are out of a supra which i thought were high-impedence. when i put them in they did not work. the engine rolls and almost fires up but doesnt because she is pooring too much fuel. i wired a resistor box into the 440cc injectors for curiosity and she fired up for about 10 minutes and then shut down again from too much fuel.

Before i wired the resistor box the car was sitting for a couple weeks with the battery unhooked. i was wondering if this reset the ecu enough for her to fire up.

This has me completely stumped lol. i dont know if maybe one of my sensors are messed up or not. i was thinkin maybe if the map sensor was messed up she might throw a code causing her to run like crap?

Any suggestions or ideas will be greatly appreciated

grumblemarc

iTrader: (4)

What ECU are you running? Retune it. Period.

jm2000turbo

im running a p28 chipped ecu

jm2000turbo

would there be any other possibilities?

grumblemarc

iTrader: (4)

Not really. I don't know what your transplant actually consisted of. If your wideband is telling you it's overly rich then get it retuned.

jm2000turbo

well actually ive posted kind of a walkthrough of what ive done since ive swapped the engine. ill copy it into this thread.

jm2000turbo

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Hey, im new so not sure if im doin this right but here it goes lol. i have a 93 civic which was swapped to a d15b with turbo and i swapped it into my 2000 civic dx. i have done all the necessary changes such as a obd2b to obd1 jumper harness, im running a p28 ecu, ive changed the 3 wire iacv to a 2 wire, changed the injector plugs, dizzy wiring, altenator, etc. The white iat plug on the d15b head is now not connected. She also has an aftermarket map that i had to wire into my harness. Havn't wired vtec yet. The engine was running blue top 450 injectors and a resistor box from an eclipse. But of course seeming it was my first engine swap, i had no idea what the resistor box was. I new it was wired up in the 93 but didnt wire it into my car. So i fired her up (without the resistor box) and she ran fine. I went for a little spin and when i went to step her down, she bogged and shut down on me. She washed herself down on her cylinders. So i brought her back and drained the oil, etc to try and clean her out. Then i ran her off stock 240 injectors for a little bit until i found out how to wire up the resistor box. She ran ok off the 240s but was starting to wash herself down again. I rewired the 450 injectors again and the resistor box once i dropped the oil again but she will not fire up with the 450s. she still runs off the 240s but not at all with the 450s and resistor box. I have no idea whats causing her not to run with the 450s. She ran perfect while in the 93. I was thinking maybe the injector drive in the ecu is fried and just pumping steady flow to the injectors?? Other than that im stumped for ideas

jm2000turbo

i dont know if thats of any help to you or not lol

grumblemarc

iTrader: (4)

I have read that running injectors without a resistor box can damage or even fry an ECU.

jm2000turbo

is there any way that i can check to see if my ecu is fried?

maxwellmercer

Open it up.

dpetro1

Let's take a step back. What injectors are currently in the car? You can test the impedance (resistance) with a multimeter to confirm if they need a resistor box

Was the car ever actually tuned? Just because the ecu is chipped doesn't mean the proper map is on the chip. I would suggest getting a new basemap properly scaled for the 450cc injectors and go from there. Or swap to a stock p28 map and see how the 240cc injectors do.

Does the car have any CELs?

jm2000turbo

the injectors that are currently in the car are 440cc injectors. i tested the resistance and they do need a resistor box. its reading roughly 8 ohms. with the box its reading between 2 and 3 ohms which as far as i know is correct.

The engine was tuned long before i bought it because it was already in another car. When i bought the car it had 450cc injectors with a resistor box. I put the 440cc injectors in myself, thinking they were high-impedence. I wired in the resistor box this morning and the car fired up right away and ran for about 10 minutes then died again.

Ive been working on the car the past couple weeks and everytime i tried to start it without the resistor box and the 440cc injectors, she would start but barely want to stay going because she was getting too much fuel.

Hopefully that all makes sense lol.

jm2000turbo

And yes the engine light is on but i can't find out what codes because i only have an obd2 code reader

grumblemarc

iTrader: (4)

Why can't you just pull the code/s via the jumper method?

jm2000turbo

I am not femiliar with the jumper method so how would i go about doing that

grumblemarc

iTrader: (4)

Check the FAQs.

dpetro1

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/how-pull-cel-d4-srs-abs-codes-code-lists-1901557/

pull the code and let us know what you find.

apexi_rsx

where did the 440's come from because if they are saturated RC440's they do NOT need a resistor box. may wanna be the route u wanna go since using the resistor box seems to be throwing a wrench in your project. maybe try going to a junkyard and grabbing a resistor box from an accord or any honda with one and trying that out. if your chipped ecu was mapped to run a resistor box and 450's and now your running saturated 440 injectors you will need to get another basemap to run this setup. im sure u can have phearable.net or xeocron.com to send u a new chip with a decent basemap with a mod list u provide to get u in the ballpark to get you to a tuner for 20 bux.

jm2000turbo

The 440s came out of a supra. The seller told me they were saturated but don't know if thats right or not. I had another resistor box out of an accord which is the one i tried yesterday when she fired up but after she shut down again she hasnt started since.

dpetro1

Everything I can find online says the 440 supra injectors are peak and hold. So you should ge good with the resistor box. Maybe test the injectors resistance again cause 8ohms sounds a bit high for p/h injectors.

Any word on the CEL?

kyden

measure the resistance across the pins. it will tell you if its saturated or not.

jm2000turbo

ok thanks. and still no word on the CEL because i still have no idea how to get the readings. if someone could let me know how because i cannot read them with the code reader i have, it would be great.

Former User

See post #18

jm2000turbo

Perfect thanks. Ill let you guys know the results tomorrow