Using a 97-99 ECU in a 6bolt 95-96.

[my_gst95]

I tried searching, but I couldn't find how to install a 97-99 ECU in a 95-96 (which wires need to be switched if any).

Just speculation, but I've noticed that most people with a 95-96 dsm and a 6bolt swap or a 1g CAS have the Random Missfire code appear even WITH the potentimeter mod. Interestingly I know 2 members here in Sac, and a few tuners members that have a 97-99 with a 1g cas, potentimeter, and no problems.

Could this be due to the already inverted single the 97-99 share with the 1g's? If so, I'd like to test this theory in my car, as I have no intention of running DSMLink or the need to modify my eprom.


my_gst95

(I'm having difficutly finding the link that describes using a 1g ecu in a 2g. I would imagine you need the 1g harness and sensors, but not sure how the speed sensor would work since its different between the 1g and 2g).

 

[XtReMeToYz]

You need to switch them at the coil. Normally 1&4 fire together and 2&3 fire together, hence why it's called a 'Waste Spark' system. Only 1 spark is used for combustion but 2 are delivered.

Thats copied from another forum I asked about the same question. When I did that to my 97, the car has a hesitation under light throttle between 2500-4k rpm's. Ive since learned you 'might' have to swap the injector wires as well, but Ill let someone else verify that.

 

[Stapl3]

There is no way you searched. We just did this last week, and 3 times the week before.

I do not want to be a dick at all, I really don't, but this comes up weekly.

 

[idt512]

There is no way you searched. We just did this last week, and 3 times the week before.

I do not want to be a dick at all, I really don't, but this comes up weekly.

Another waste of a response from this guy....yeah you are a dick! :thumbdown

 

[Stapl3]

Another waste of a response from this guy....yeah you are a dick! :thumbdown

It's Richard to you f43gg0t. Like your post was close to helpful. Atleast I told him to scroll down or click a page over. You want to start a flamewar, PM me. Otherwise find your way out of this thread.


To put the 97-99 ECU in a 95-96, expect to have problems. First off, the spark plug wires need to be switched. 1 with 2 and 3 with 4.

I put a 99 ECU in my 95. The car ran[/u] and that's about all I can say. Think about the car in a cartoon when it's puttin and jurking and all that. That's pretty much what it was like. Could it get me to the grocery store, probably, but so could my sisters tricycle.

The 95-96 and 97-99 cas's are 90 degrees off, and the wires need to be inverted.

As for 1g cas on a 2g, the cas just hates obdII, and that's really a luck of the draw or Eprom mod for it to work. It's not 2ga/2gb specific as far as I know.

I suggest to everyone to just keep the CAS with the right years, it saves many headaches.

 

[my_gst95]

I suggest to everyone to just keep the CAS with the right years, it saves many headaches.

If only it were so easy for those of us who have done a complete 6bolt swap. Naw, I didn't think you were being a dick, but I think I should have Re-worded the topic or question to be more specific. I did a re-search and found your post (thanks). It wasn't really meant to be mainly about installing a 97-99 ecu in a 95-96 though. I already understand how the signals are inverted, but a refresher never hurts anyone. I am mainly wanting to put a 97-99 ECU in my car because I have a 6 BOLT SWAP that has to have a 1g CAS (unless I modify the front case which will be difficult.)

I was thinking that 97-99 ECUs seem less prone to the Random Misfires due to the already inverted signal LIKE the 1g. That is why when you use a 1g cas in a 97-99, you don't need to swap the spark plugs wires and injector wires like in a 95-96.

Stapl3, did you install the 99 ECU in your 95-96 with a 1g CAS? Just trying to gauge some results. I understand that using a 99 ECU in a 95-96 7bolt may make one run richer (even after swaping plugs and injectors). But perhaps it wouldn't be the case for those with a 6bolt and/or a 1G CAS...

my_gst95

 

[Stapl3]

No, I have my stock 95 CAS.

I really doubt that the 1g CAS and obdII misfire problem is 95-96 specific, otherwise it would be somewhat common knowledge. By all means give it a try though.

I see how youre thinking this, but the 97-99 and 1g CAS have less in common than a beater 1g and Shep's car. Same, eh, well, yeah, I guess. But really not at all.

I'm just thinking that you should put the 95-96 cam gear CAS setup back in, and put the half moon back in the passenger side of the head...if at all possible. I'm going to confidently ASSume that the 95-96 stuff will just plop right in a 1g head.

 

[my_gst95]

Unfortunatly for complete 6bolts (head and block included) there is no mounts for the cam or crank sensor from a 2g. Else, like you said, more people would be doing it to avoid the random misfire they get from doing a 6bolt swap. If you go to 1gina2g yahoo group, Random Misfires are THE most talked about thing. And if you look at most of the posts started on here of people who have that problem, most of the time they are 95-96. There are some exceptions for the 2gb, but just what I've noticed. 98spydert has his ecu I'm going to test out and I'll post my results. I've also created a signal inverter as shown on road races' site that'll I'll test with my current ecu. Apparently, some people have had luck with that as well. If anyone else can post their related experiences or ideas (helpful or not) please do.

my_gst95

 

[6 bolt swaper]

I swapped in a 6 bolt 4g67 by mistake and just yesterday found out that it's a 1.8L. Great news! It runs fine no hesitation, but I got the exhaust gasses checked and my HC's and O2 are elevated so I'm misfireing too. Any suggestions on that one???

 

[Stapl3]

I swapped in a 6 bolt 4g67 by mistake and just yesterday found out that it's a 1.8L.

Of all the things I have read on the internet since 1995, you sir get the prize.

 

[XtReMeToYz]

Of all the things I have read on the internet since 1995, you sir get the prize.

His actual name is what kills me, goes perfect with what he did

 

[98spydert]

Yo my_gst95, is your ecu socketed? I've... got... a plan.

 

[gsx951]

I used a '94 CAS with a '95 eprom ecu and have had zero CEL's for RM.

Check the on going thread on the Yahoo DSM1Gina2G group about the Hyundai front case.

Friends don't let friends run the barometric mod.

 

[Scrymerr]

I run 1gina2g.

I have a 96 ECU.

I use the Baro mod.

My car runs awesome, and has for as long as I can remember.

Don't discredit something just because you or someone you talked to could not figure it out.

--Dan

 

[gsx951]

I run 1gina2g.

I have a 96 ECU.

I use the Baro mod.

My car runs awesome, and has for as long as I can remember.

Don't discredit something just because you or someone you talked to could not figure it out.

--Dan

The Barometric sensor mod is a trick that most of the list members in the DSM1Gina2G group would advise you against. I believe the same is true for the Wisemen here.

"I don't recommend putting a 10K potentiometer on the barometric pressure
wire going from the MAF to the ECU. The potential for melting your pistons
is real." Justin (DSM 1Gina2G list owner)

"Don't use the POT mod. You are affecting more than just the check parameters of the RM code. You also affect timing tremendously."

"Look at my name and then look at the Magnus 1G ina 2G page. I know what I am talking about" Sean Caron (Tuners Wiseman)

"fyi - the magnus pot-mod is dangerouse and didnt change anything on my car."
Dave99GST (Tuners Wiseman)

I could post quotes all day.
It worked for you and that's good but that still doesn't make it the smart thing to do.


__________________

 

[ninety7gst]

Of all the things I have read on the internet since 1995, you sir get the prize.

i second that