Cascade Crew

BluFbdy · Posted: Mon Dec 31, 2012 12:57 pm Post subject: ECM gremlins?

So to get attention for this problem im posting another thread lol

I seem to have a bad ecm, or memcal, the SES light is on solid, i cant pull codes to save my life, and my engine fan is on as soon as i turn the key on. We missed the passenger head ground to the firewall during our inital startup and i believe that took out my ecm but i am torn because i soldered jumpers to a v6 memcal to make it work for a v8 in the zif socket. The chip has a tweaked AUJP burn to it, this wasnt happening until we decided to drive the thing, so i need to know how to check which one is the problem? i pulled the chip, blanked it and reflashed it with no avail, what i would like to do is get a known good ecm and memcal, plug it in and see if the problem goes away, if it does try my zif/memcal in the good ecm, if it works the ecm is shot, if it doesnt the memcal is shot, or both. who knows. My problem is the only known good ecm i know of is lukes which is in the middle of painting right now lol

Does anyone have a known good 730 ecm? or know of a way to t-shoot this thing?

aaron_sK · Posted: Mon Dec 31, 2012 1:16 pm Post subject:

When you turn the key on (not starting the engine, just key on) does the SES light blink and then hold solid or is it just on?

BluFbdy · Posted: Mon Dec 31, 2012 1:24 pm Post subject:

No blink just straight solid at all times when the key is on

aaron_sK · Posted: Mon Dec 31, 2012 4:49 pm Post subject:

Then the SES light is not operating correctly due to ECM failure, wiring failure or PROM failure.

Get a hold of John (RSFreak). He used to have a pile of 730's. Laughing

BluFbdy · Posted: Mon Dec 31, 2012 5:21 pm Post subject:

I've got a reman coming in tomorrow, if its the prom then I need to check my memcal solder job, unless someone has a 305 tpi memcal they wouldn't mind selling me lol the v6 jumpered just gives me a bad feeling

This car is gonna be brand new by the time I'm done chasing these bugs lol I am confident its not the wiring, I'm gonna do continuity between the aldl and the ecm in a few, working on the tach fix currently

On a side note does the speedo go out in this kind of instance? I put the Vss in wired to the factory wires but it isn't working, and Luke said there's something Craig moates did to his tune that fixed his speedo but he also didn't have a failed ecm/ prom at he time lol

Twilightoptics · Posted: Mon Dec 31, 2012 5:25 pm Post subject:

Is the sd memcal different than a maf one physically? You know ir you are using eeproms you dont need the memcal unless in limp mode.

BluFbdy · Posted: Mon Dec 31, 2012 5:35 pm Post subject:

I'm using a zif socket, does it need the memcal to operate normally? If not ill try pulling that out and see if it fixes my issue, as far as th differences I'm not sure.... That's a really good question lol I think they may be different but I'm like the last person that would know, I just need it for limp but if I can yank the v6 one and run the car ill take my chances until I can find a good one to put in, I burnt 1/2 tank of gas already :/

Twilightoptics · Posted: Mon Dec 31, 2012 5:38 pm Post subject:

Disco it.

BluFbdy · Posted: Mon Dec 31, 2012 5:45 pm Post subject:

? Just remove the memcal and give it a shot with the zifand eeprom?

I don't thibk the chip is to blame here either, I pulled it, blanked then reburned it and verified with he beffer so its either ecm or memcal lol

Twilightoptics · Posted: Mon Dec 31, 2012 5:57 pm Post subject:

Verified buffer doesn't mean its data is correct. It just means the data from the bin ma de it to the prom.

Try without memcal.

BluFbdy · Posted: Mon Dec 31, 2012 6:33 pm Post subject:

Alright ill slap the cluster in and give it a shot

BluFbdy · Posted: Tue Jan 01, 2013 1:11 pm Post subject:

New ecm no go, pull memcal no go. Guess I get to trace some wiring

aaron_sK · Posted: Tue Jan 01, 2013 3:25 pm Post subject:

Could also be an issue with the adapter: ZIF not connected properly, EPROM not inserted correctly, ect.

I got your text after I was already well across the bridge. Sorry man. Laughing

RSFreak · Posted: Tue Jan 01, 2013 5:47 pm Post subject:

BluFbdy · Posted: Wed Jan 02, 2013 5:41 am Post subject:

Alright well Idk wtf we did right but its running smooth now, could use a good tune but I'm gonna screw with that once I figure out my speedo.

So apparently when we failed to disconnect the battery when pulling the memcal it wiped my tune leaving me at oriely I'm gig harbor, Luke picked up my laptop and we reburned it, slapped it in and the light beahved normally, right off the bat I got a code 41 for cylinder select (damn v6 memcal) and 43 for knock, I know i bought the proper knock sensor but I'm gonna warranty it out to be safe. Kris ended up bringing me a MAF tpi memcal that I put in and it ran great!

So for future reference : make sure your zif socket is tight in there, and a MAF memcal will work for cylinder select purposes. Not sure on limp settings yet as I haven't hit limp mode.

My question is I know the knock settings changed in the 90's, is it possible the.maf memcal is throwing the code because its seeing the 90'a knock signal? The motor isn't knocking or running bad it just kicks the light on. Even though it may be a poor idea can I change the knock flag on the chip? My tunerpro had less settings than lukes and we used his laptop once mine died, we couldn't find it on his. I read on tgo if you use a v6 or maf memcal you need to disable the knock flag because they're different from the SD settings but I've been searching so much its not even funny I may have read it wrong

Like I said now its just down to getting the speedo to work >_< this wiring is getting old lol atleast Im confident in my work after being at cartoys Laughing

aaron_sK · Posted: Wed Jan 02, 2013 8:53 am Post subject:

What knock sensor did you use?

The 90-92 TPI sensor is different then the older sensor, and the TBI used the old sensor till '92 IIRC. Brandon and Jim had also this problem when they did his swap.

BluFbdy · Posted: Wed Jan 02, 2013 8:31 pm Post subject:

I went out and bought the sensor for a 92 z28, but knowing most parts jockeys they could have given me the wrong part. Ive noticed the roller rockers make a bit more noise than the factory rocker arms, is this normal? Could that be triggering the sensor?

Twilightoptics · Posted: Wed Jan 02, 2013 8:44 pm Post subject:

If it's triggering the sensor you have the sensor screwed in WAY to far. Are you getting knock counts or just the fault code?

Roller rockers should be quieter for the most part. Full roller or just roller tip?

Different valve covers let different sound through also.

aaron_sK · Posted: Wed Jan 02, 2013 8:54 pm Post subject:

BluFbdy · Posted: Wed Jan 02, 2013 9:49 pm Post subject:

Full roller crane golds 1.5 I believe, I haven't had a chance to datalog because my laptop crapped out on me and lukes is on the fritz so were trying.to get it on my backup one right now