95 EPROM ECU stuck in base timing

[allrice4g63]

So I have a 1998 Mitsubishi Galant with the 2.4 4g64 and I installed a 95 EPROM ECU in it. I had to swap injector pins, wire in a knock sensor, and swap from distributor to coil packs. I'm running 450cc injectors, a MAFT and 3 inch GM MAS, small 16, AEM wideband.

Well the car runs and idles fine but he problem is the max amount of timing I get is like 7 degrees and that's with it pinned and at idle doesn't really change at all so for some reason the ECU is stuck in base timing and I was wondering what what could cause this? The car is also stuck really lean when I give it gas it doesn't go below 14 on my wideband.

Any ideas?

 

[TALONTRAX]

I would check the wiring in your distributer-to-coil pack conversion. I know in 2g cars there is a wire tucked in a loom that when grounded, goes into base timing mode w/no computer controlled advance. I don`t know which wire or what color it would be tho . . . or if the Galant has the same wiring -

 

[allrice4g63]

ya thats what i thought it would be to but i'm not sure if the galant wiring would have it either as it differs from the 2g wiring. i'm pretty sure i figured out why it is stuck lean because my wideband ground wasn't good enough so that is fixed now. but still really low timing.

 

[allrice4g63]

can anybody else input on this im stuck and and the guys on thegalantcenter.com aint sure of whats wrong either.

 

[TALONTRAX]

All I can add bud is that on 95-96 2g cars, the timing adjustment connector wire is black & green & goes to pin # 52 on the ecu ... I can use dsmlink to do this automatically on my 98, however the 97-99 cars had no factory adjustable timing provision - The 95 eprom ecu you are running should be the same -

 

[allrice4g63]

iv checked all over and dont see one. do u think a faulty knock sensor could hold back timing this far? it does advance but very minimal like max 10 degrees. what actually causes the ecu to advance or retard is all of it based of cam angle sensor?

 

[TALONTRAX]

You`ll need to log knock counts to confirm/eliminate a knock sensor/timing retard issue. Which ecu. pin # did you wire the knock sensor to ??

Should be pin # 78 (95-96)

 

[allrice4g63]

yes that is correct i installed it into pin 78. if ya wanna take a peek at this tutorial this is what i did exactly 7g(97/98): JiPs 2g ECU Swap tutorial. - The Galant Center

 

[TALONTRAX]

If you followed all the steps exactly (I`m sure you did) then I can`t answer why your timing advance is incorrect/partially functional. There`s always the possibility that the ecu. could be bad, however I doubt it. For laughs, do you have another ecu. to try ? ? ?

 

[allrice4g63]

no just the 95 eprom. i did open the ecu up and i dont see anything leaking and all LOOKS to be good. so if its not advancing timing i have to have something not right. i wonder if i the firing order could be off for the spark plugs. but as long as the 2 and 3 plugs are on one coil and the 1 and 4 are on the other it should fire correct. the only two things i can think of are the knock sensor and maybe just maybe the firing order. other wise some sort of ground on the coil.

 

[TALONTRAX]

Do you have link or some other means to log ?? You need to log knock counts to see if timing is being pulled due to knock. If not that, then I have to think that the problem lies in the wiring somewhere . . .

 

[allrice4g63]

not link i just ordered a cable like last week for logging and what not i have a scan tool with live data but it doesnt show knock counts. iv went through the wiring like 3 times and have not found anything wrong. hmmmmmmm hmmmm....... im going to go relocate my knock sensor tnight to a differnt hole in the block because the hole i did use to thread it in. it wouldnt thread in all the way so maybe for whatever reason its picking up knock counts some how.

 

[DallasN2O]

Timing should advance quite a bit in just cruising conditions. I'll get 20+* of timing cruising sometimes.

I doubt it's the knock sensor, BUT-

Just for testing purposes you can take the knock sensor out of the equation. Take it out (of the block, leave it plugged in), take a piece of wire, wrap it around the metal body (not just the threads) of the sensor, electrical tape it in place. Ground that wire to chassis or negative terminal of your battery.

If it doesn't change, knock sensor isn't your problem.

I would suspect ECU or CAS. How do you troubleshoot these? I'm not sure.

Good luck.

 

[TALONTRAX]

+1 ^^^^ on that idea - also the cas. is adjustable, maybe the base timing is off. If it`s set too far advanced, the computed timing advance may be less as a result. If it`s set retarded too much, it will feel lazy & may also affect the computed timing . . .

 

[allrice4g63]

Is the CAS adjustable on the Galant though remember I'm still using the stock CAS in my car which is built as a assembly with the distributor. I've known of 4 guys on thegalantcenter.com that have done this and they have had no problems but of course none of them guys I can get a hold of. The best advice I get off that site is to ask for help on this site.

Ok, looking at this diagram 1g cam angle sensor fix? - The Galant Center it shows cylinder 1 and 4 go to pin 10 on the 2g ECU, cylinders 2 and 3 go to pin 23 on 2g ECU. With that said in this tutorial 7g(97/98): JiPs 2g ECU Swap tutorial. - The Galant Center it says pin pin 2 of the power transistor goes to ECU pin 23 and it says pin 7 goes to white wire on 5 wire plug on the stock CAS. But in the diagram from Magnus Motorsports they have pin 7 of the power transistor going to pin 10 on the ECU which controls cylinders 1 and 4, so using jips tutorial what controls cylinders 1 and 4?