zimmy709

since this was closed for being old...

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/94-civic-d15z1-swap-limp-mode-wont-rev-past-3500-rpm-2855658/#post47614122

i will start a new thread with the same information in it. because it is the EXACT same thing... i mean EXACT, and a very rare issue i believe.

ok, long story short... (yea right) i personally have a good bit of experience with swaps and crome tuning.. yada yada.

i have a friend with a 92 civic, he bought it with the d15z1, this is not the original engine to the car, i suspect that it previously had a d15b7 in it. the ecu and intake manifold read P06. the block reads d15z1 and head is P07.

so... i believe what i have here is a non vtec car swapped vtec-e with no egr, an incorrect ecu and missing wiring for vtec solenoid and vtec oil pressure sensor. i have properly pinned the ecu harness for vtec solenoid and vtec oil pressure sensor ran them out to the solenoid and sensor and connected them (yes i grounded the second pin of the oil pressure sensor for vtec. and yes, i did in fact have extra pins and plugs to "properly" make all of these connections at both the ecu, sensor and solenoid.

next step (before i realized the major differences in a vtec-e and vtec) i flashed the ecu with crome (my p28 out of my turbo b18c del sol... just for kicks to see if i could get it working) with a d15z1 map which effectively does nothing for the vtec-e because the entire car is missing egr (P06 IM and EM) and the 5wire wideband O2 sensor. (harness is the original one to the car, so is the 4 wire 02 sensor)

at this point this is more of a challenge than anything and i am a bit stumped on what to do outside of installing the cam, rockers and lma assemblies out of a d16z6 head, effectively making this a mini-me swap outside of possible valve sizes in the P07 head... compression differences too but meehhh (turbo maybe mwahahahah) i dont care. neither does the owner.

now... the car runs MUCH better on the d15z1 map (which this ecu is actually incapable of running entirely because of the lack of wideband bits) before it wouldnt rev past 4k and stumbled a lot but no CEL. now i have a CEL but no codes are thrown, it only has this when the car is running. i have read and read and read. the only thing i can find is that this has been a problem in the Civic VX with this engine with no real answers as to why.

bottom line, what i am trying to do at this moment is to use my p28 ecu with whatever map is necessary to make vtec work so we can get past the economy cam lobe that is not opening the second intake valve. i know the proper engagement point for vtec on this engine is low...

Does anyone have any insignt on this issue? i need a .bin for d15z1 without wideband 5wire 02 and EGR, i have been doing a lot of reading and it seems that there are a lot of improperly running d15z1 swapped cars out there with these issues. it seems to me that it may be as easy (for those with the proper equipment and knowhow) to start with a d16z6 basemap, import the parameters from the d15z1 maps and flash a chip for a p28 ecu. i think this would get it up and running as close to stock P07 as possible without putting it on a dyno. i know there are also options to swap in the d16z6 cam rockers and LMA's and run a p28 with d16z6 oem map. But i dont have those laying around (anymore) and i do have moates equipment crome and a chipped p28.

i tried running the d15z1 maps straight on the p28 but its running a bit funny, but then i dont know what injectors are in it either. i have suspicion of d15y7 injectors which are too big for the fuel tables in the d15z1 .bin, maybe ill just change the injector duty... i'm sick of typing, any ideas??

any ideas on the phantom CEL issue? again i have read a lot about this issue in vx civics, the light comes on only after a bit of driving, never throws a code (yes i know how to check the CEL codes) never throws a code when you check them.

also should note i don't give a flying horse pucky about ubermileage, just want to get this thing running near correctly.

ubermileage guys, sohc guys, d-series guys, crome guys, pgmfi guys..... HELP!

Former User

For our members who struggle to understand the wall of text above, here are the CliffsNotes:

(I hope the facts are right because it wasn't easy)

grumblemarc

iTrader: (4)

Since it wasn't mentioned in this thread or the last one, have you tried contacting places like Phearable or Xenocron for such a .bin file? They may not want to come up off it for free though.

94EG8

'93 - '95 Cali spec ECU uses a 4 wire O2 sensor and no lean burn, I think it has the EGR valve though.

zimmy709

RonJ@HT... Thank you! That is perfect and much easier to diagnose. But as I'm sure you know I felt it necessary to let the haters know I'm not a dummy fiddling with something completely over my head. hence all the babble. But again thank you for sorting out my babble... Typed with MANY interruptions at the office. No one understands the importance of Honda-tech at the work place.

Grumblemarc. No I have not checked any farther than the .bin library on pgmfi.org
I will post there to see if someone is either willing to share a .bin to solve this thing or possibly accept my praise... Or more likely PayPal haha

94eg8. Maybe we can fool the ecu or change a setting to ignore EGR. Thanks for the info, it's worth checking into.

I'll post back tomorrow with any info found on the .bin files and Cali spec ecu.

Thank you all for your help and input so far

zimmy709

no time to mess with this lately unfortunatly

canadaek

if your using a p28 there is no need to fool the ecu to ignore the egr valve as a d16z6 doesn't have one . the engine should run fine with a 4 wire o2 on a p28 as that's also what the d16z6 uses .Ii would swap the injectors for a stock set of d15z1 injectors and lower the vtec crossover lower also did bd1 vtec motors even look for vtec oil psi sensor ??

94preludeguy

Sounds like it might be easier to just use a Z6 head honestly.

Jimster480

interesting, well that motor is out of a VX. It wont really run properly without the wideband O2 sensor. That motor has dished pistons and a flat head. it hits VTEC at 2500RPM to open the 4th valve.
its supposed to have 190CC injectors also. The problems you will run into is that motor is very scientific in the way that it runs. its a precise lean-burn setup, which is why it has dished pistons (as they tend to have lower chances of detonation). The ecu uses the EGR and the wideband to precisely control air fuel ratios to minimize detonation (i believe this motor also has a knock sensor).

Also since the pistons are dished, putting any head on it yeilds a very low compression setup. Not very ideal for a normal car... Although you could boost it, just remember the stock D series rods don't handle too much power.

78F350

My '93 Del Sol Si has a D15Z1 and had a stock p28 and 4 wire o2 in it when I bought it. I bought a wide band 02 sensor for about $200 and put a p07 in it and made a sub-harness to plug into the stock harness, plus 2 or 3 wires to the ECU. It runs great now.

Most of the info on the web shows how to rewire the VX to a 4-wire, but if you search the archives here you should be able to find all you need.

For the 5-wire sensor I used a NGK/NTK L2H2, sold by Barmac Automotive on Ebay.

Jimster480

yea but hes also missing the intake manifold with the EGR and stuff.

94preludeguy

I ran a D16Y5 in my old 96' DX using the P2N ECU without a wideband. The car ran fine but didn't get the greatest mpg and always had a CEL. But atleast it ran, I drove it like that for 6-7 months without any issues.

I know it's different in this case because Y5/7/8 blocks are identical and b5/z1/z6 are not. b5/z1 have the same blocks, different internals.

There is a lot of good reading in this thread about the D15B/Z1.
http://www.d-series.org/forums/gener...-vtec-faq.html

Jimster480

well there u go, it never ran properly

94preludeguy

Right, and as quoted from the OP...

"also should note i don't give a flying horse pucky about ubermileage, just want to get this thing running near correctly.

ubermileage guys, sohc guys, d-series guys, crome guys, pgmfi guys..... HELP!"

Jimster480

true, so maybe he should do what you did just to get it running.