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Resolved Evo ECU in 1G- Car runs but misfires

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fourgsixthree33

10+ Year Contributor
1,244
45
Oct 25, 2010
Athens, Pennsylvania
I am trying to get my 1G running correctly with the Evo ECU. Actually, it's a 3G ECU and I am using the Tephra V7 ROM (96530706). I have been searching and searching for WEEK's. All the information on the web regarding the Evo ECU in a DSM is very spotty and you have to dig through 30+ page long threads to find anything.

A little background, I bought a 1G GSX shell back in October. I have been building this thing from the ground up. Wire tuck, fuse box relocation, battery relocation, deleted a bunch of stuff (ABS, AC, PS, emissions, EGR, FIAV, IAC, heater core, cruise, etc.), painted the engine bay, complete overhaul. Car has a built 6 bolt, 1G CAS, 2G MAF (until I get this up and going, then switching the SD), RC 550's (also until I get this up and running, then putting in my FIC 1600's).

The car will fire up and run great with the stock 1G ECU. When I remove it and install the 3G ECU with patch harness, with my current ROM, or any ROM for that matter, it will run poorly. It won't idle on it's own, I have to keep my foot on the gas and keep it at 1100-1200RPM. It otherwise, sounds OK at "idle". When I try to rev it, it will sound like and IC pipe is off. Sounds like sh!t, cuts out/misfires, whatever you want to call it. See video below.

I have the correct MAF values for the 2G MAF, MAF scaling and compensation. Obviously the immobilizer is disabled. I left the injector scaling at 513 and added to the injector latencies with the correct latencies.

The engine runs the same whether or not I have a completely default Tephra V7 ROM (any of the ROM's) with immobilizer disabled. Even after the MAF and injector adjustments, it doesn't really run any different.

I have tried messing with the firing order. I tried the Evo firing order, 1342. Barely ran with this. Tried the reverse DSM firing order, 3214. Same thing. So, I know my 4123 firing order is the correct firing order. Even though I have read on multiple threads (Tuners, EvoM, club3G, DSMtalk, etc) where people said you had to run the Evo firing order. Other people said you had to use 3214 and others said you don't need to change the firing order at all. This is the kind of stuff I find when searching anything about the Evo ECU in a DSM.

I also played around with my injector plugs, switching them around to a few different combinations, no change AT ALL.

I have a wideband, but it's not connected yet. Interior is still apart, exhaust isn't installed, drivetrain isn't installed. My front o2 sensor is not wired up yet either because I still have my 2G o2 sensor in this o2 housing. So I either need to wire this 2G o2 sensor into the 1G wiring or change out the sensor with a 1G sensor. I also have an Evo knock sensor installed.

I am hoping one of you can point out something that is required to be done within ECUflash or physically with something else that I have not picked up on yet.

Anyway, thanks for reading and feel free to link any threads that may prove to be helpful.

ATTACHED IS MY ROM AND A LOG FROM EVOSCAN


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  • EvoScanDataLog_2016.02.13_14.01.25.csv
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The ECU is a lot more advanced than our 20+ year old ECU's. The Evo ECU's are obviously capable of a lot more. I ran a Blackbox in my 2G and loved ECUflash. And....I like being different. I respect with ECMlink has done for our community over the years but everyone and their brother is using Link.
 
The ECU is a lot more advanced than our 20+ year old ECU's. The Evo ECU's are obviously capable of a lot more. I ran a Blackbox in my 2G and loved ECUflash. And....I like being different. I respect with ECMlink has done for our community over the years but everyone and their brother is using Link.

Yes, the fact that everyone and their brother is using link is a good thing.

It means you can upload a log here and get help quickly.

Also Link is used in cars that hit 9 second's in the quarter mile, how much more advanced are you trying to be?

If the car runs great with the stock ECU, I would have just added Link & called it a day.

Being different will cost you more time trouble-shooting this issue and that's a precious asset that we can't buy in life.
 
True, it would have been easier.

True, DSMlink would have easily allowed me to achieve my goals.

True, DSMlink is an awesome source for tuning.

I just prefer ECUflash. I think the fact that there isn't nearly as much info out there on the Evo ECU in DSM's is one of the biggest reasons why I chose to go this route. I want to clear this up and provide information to pass onto others. I'd like to contribute in giving us another great option for Tuning.

Eventually, one way or the other, I will figure this sh!t out. Then I can make a thread on here as well as on my website to clear some of this up.
 
True, it would have been easier.

True, DSMlink would have easily allowed me to achieve my goals.

True, DSMlink is an awesome source for tuning.

I just prefer ECUflash. I think the fact that there isn't nearly as much info out there on the Evo ECU in DSM's is one of the biggest reasons why I chose to go this route. I want to clear this up and provide information to pass onto others. I'd like to contribute in giving us another great option for Tuning.

Eventually, one way or the other, I will figure this sh!t out. Then I can make a thread on here as well as on my website to clear some of this up.

More power to you, if it wasn't for people being different we wouldn't have made improvements throughout the years.
 
More power to you, if it wasn't for people being different we wouldn't have made improvements throughout the years.

That is very true. This is a very interesting way of tuning our cars. I knew it wasn't going to be easy to find all the needed information to get up and going, but it is well worth it IMO.
 
Pretty sure I figured it out. Finally decided to go through the pinouts between the 1G->Evo ECU and the 3G ECU.

Pin 56 (MPI) of the DSM wiring harness connector is supposed to go to pin 22 (Fuel Pump Relay) of the Evo ECU.

But beings I have a 3G ECU, DSM pin 56 is going to pin 22 of the 3G ECU which is actually for the AC. Pin 8 of the 3G ECU is actually the fuel pump relay pin, not pin 22 like the Evo. I will make the changes to my patch harness tomorrow and post back with another update.
 

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Pretty sure I figured it out. Finally decided to go through the pinouts between the 1G->Evo ECU and the 3G ECU.

Pin 56 (MPI) of the DSM wiring harness connector is supposed to go to pin 22 (Fuel Pump Relay) of the Evo ECU.

But beings I have a 3G ECU, DSM pin 56 is going to pin 22 of the 3G ECU which is actually for the AC. Pin 8 of the 3G ECU is actually the fuel pump relay pin, not pin 22 like the Evo. I will make the changes to my patch harness tomorrow and post back with another update.

Glad your getting it sorted, would be nice to have more info about these forays into the unknown.

I myself am wrestling with the decision between getting link or using my evo 8 ecu setup.

I have ecuflash, an 8 ecu, 8 maf, complete 8 engine harness, 8 knock sensor already on the car, etc.

It's hard for me to want to sell all that and barely afford link (I could buy it outright, but I don't want to spend ~$600 on just that ATM), even though I know it'd probably be better for me to start on this platform with.

I'll prolly end up making the patch harness and trying it. If it doesnt work, I'll sell it and spring for link.
Btw, I got all the 8 stuff for less than $150, thus my dilemma
 
Glad your getting it sorted, would be nice to have more info about these forays into the unknown.

I myself am wrestling with the decision between getting link or using my evo 8 ecu setup.

I have ecuflash, an 8 ecu, 8 maf, complete 8 engine harness, 8 knock sensor already on the car, etc.

It's hard for me to want to sell all that and barely afford link (I could buy it outright, but I don't want to spend ~$600 on just that ATM), even though I know it'd probably be better for me to start on this platform with.

I'll prolly end up making the patch harness and trying it. If it doesnt work, I'll sell it and spring for link.
Btw, I got all the 8 stuff for less than $150, thus my dilemma

The Evo 8 ECU to DSM stuff really isn't documented well, at all. I'm going to change that. The information is out there, but it's very hard to dig it all up and connect the dots. Not to mention deciphering what actually applies to you and your setup. All the different variations. 1g/2g car, 1g/2g/evo MAF/SD, injectors, type of CAS, actual type of ECU, tons of stuff.

I have already started logging any information I have found. Writing things down, adding links to my Favorites, screenshots, etc. Of course I don't trust what I haven't tried first hand, so that will be something I will have to do before laying it all out there.

If this solves my problem, it should be smooth sailing from here. Once I actually found the information I was looking for, this whole process really wasn't that bad up till this point. It's the amount of time finding the needed information that has killed me.

I'm going to make the necessary adjustments to my patch harness tomorrow. I'm not a genius or anything, but I would imagine these two pins being flip-flopped is a major deal.

Also if you are looking to buy a patch harness, I know a guy that makes them upon request. He's quick and does good work. I didn't meet him until after I bought a patch harness off of the Facebook groups. Let me know and I will set you two up. The patch harnesses actually don't look like they would be that big of a PITA though. I bought mine for $90, would have attempted making my own but I was busy with the rest of the build and didn't know as much as I do now.
 
awesome, i may bounce some ideas or what my findings are off you as i progress. im going to break the motor in as it sits and make the harness in the mean time.
i will try to document what i come up with as well, or at least post/pm to you if you want to spear head it.

i was going to make the patch myself, since i have a whole evo 8 harness, plus i so electrical for work and would be easy for me. i looked at buying one from a few ppl, but spending money on something i can easily do myself seems silly. its just wire and soldering, plus reading some diagrams. thanks for the offer tho!

i figure with the 8 equipment, i should be able to get the car to start and run fairly easy out the gate. link would have just been easy to learn on, tho ive played with MS some and off-brand tuning solutions, so ecuflash will probably be ok.

cheers to us blazing a trail!
:applause:
 
Lol. Yeah man, I'd love to get a few of us together dedicated to setting this whole thing straight. This is the kind of stuff I like doing for our community. I love contributing, without people that didnt, we wouldn't be where we are now.

I will probably make a new thread once I figure out which sub-forum it would be appropriate in. Just something to document information as I/we go. I also want to make sure that my current issue at hand with the car not running properly is resolved. I'm confident that this is my issue.
 
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