ypipe

OK i posted 1 time befor asking questions and yall were very hlpe full so ill ask agin.

1. I made my ALDL cable and downloaded WINALDL but lets be honest i have no clue what im looking at. Ive searched the arcives and still dont know what accaptable paramiters are for O2 sensor TPS MAP ect. so where do i find this info.

2. still trying to ID my ECM (tag was not on it) i think its a 1228746 but not sure. ive tryded to uses the MEM PAk id AKRK but have not seen it on any of the sites ive been to same with CAL pak 16060837. Any help IDing what ECM i have would be great so i can make sure im useing the right set up in WINALDL.

Thanks in advance

Be safe

V8Astro Captain

iTrader: (1)

If you have TBI then it's the 8746 ECM.

At idle, MAP should be around 35 kPa, TPS should be around .5x volts, the O2 sensor will swing around wildly and appear not to make any sense at first but you'll get used to looking at it. IAC will be high when the engine is cold and will come down as it warms up. It'll probably settle around 20-30 counts.

If the BLM is 128 then the fuel table it dead on. It probably won't be tho. If it's lower then it's too rich, if it's higher then it's lean. Think of 128 as it being right on, and if it's lower then the ECM is taking fuel out...if it's higher then the ECM is adding fuel. The BLM means nothing at WOT tho...

ypipe

OK this is helping and explains some of what i didnt know. Next what is PROMID, INT, IAT and BLM what are they not just values but what are they telling me about the engine. The reason im going through all this is my 350 tbi i build ran good for a week then weent hay wier. wont idle and is rich as hell can smell the fuel in the exaust. so trying to diagnose. stock 305 chip and rich why? 350 injectors. any way i get a low battery (iac inhibited ) flagso am gusseing its either bad IAC or bad wire. is that what the flag means? I gusse i need a book or a sight that has more basic knowledge so i dont drive yall insane with same old questions asked a thousand times. my problem is im computer dumb im lucky to be able to turn desk top on. so any other info/ help is great.

Thanks Ypipe

V8Astro Captain

iTrader: (1)

There ya go.

You need to get the 350 chip. The 305 chip is for a 305...

ypipe

OK I have a 747 ECM from a 90 suburban 350. I looked at the pin outs for both ECM and looks like the main diffraance between the 2 is C15 and D15 on the 8746 ECM have an additional wire running to the INJ. So the question is will the 747 work with my wireing or do i need to repin it some? Or can i pull the chip from 747 and plug it in to the 8746?

kevm14

Actually, if BLMs are 129 or higher during WOT, then the ECM is adding WOT fuel. 128 or under and it won't take away any. I've tuned most of my VEs to get BLMs of 125 across the board. It's for consistent WOT AFRs...

ypipe

OK ive switched ECM to a 1228747 with akwa code chip from a 1990 350 2500 suburban and there is NO CHANGE IN THE WAY THE CAR RUNS AT ALL. the vehical will not idle any more. its richer than it should be from the nose test ( its blowing a whiteish blue fuel smelling smoke) What i need is information on WINALDL to diagnose this problem. I have the caaable and soft wear just dont fully understand what it is that im reading. Rember the car ran fine for a week withthe 305 chip and 350 injectors (had a small fluctuation at idle but ran and waas driving while i worked through the problem). so if anyone can advise me it would be so great, i hate to go back to a carb being this close to getting this thing running.

OK i saved a DATALOG but dont know how to post it. looks like IAC count gose crazy at times then BLM starts droping, was getting a closed loop flag a rich flag and other stuff i have no clue about. where can i learn what it all means ive searched this site and foud a few tghigs but is there a comprehensive site that has info on how to read all this?

ypipe

OK solved my problem. I removed the CATS when i put the 350 in this is causeing my O2 sensore to cool off at times and the CPU gose in to a forced closed loop. I replaced the O2 with a heated O2 from a 95 camaro and this thing runs great. still running the 305 chip blm stay between 116 and 144, 128 at idle. IAC is 24 at idle. so every thing works just fine now. thanks for all the help i recived here.

kevm14

Did the suburban originally have a 1 wire O2? If so, how do you switch to a heated O2?

ypipe

92 and down vehicals are 1 wire o2 sensores.


used Bosch O2 number 15732. its a 4 wire. Black wire for this o2 is the actual sensor wire it becomes the purple wire. 2 white wires are the heating eliment so polarity is indifrent 1 gose to ign hot the other to ground gray wire is cpu ground or dont ues or body ground. hope that helps.

kevm14

Well my 93 is the last year of TBI in the B-Body and it still uses a 1 wire O2. Are you saying that 93 TBI trucks use a heated O2?

Anyway, can you expand on the gray wire? What did you do with it? What should be done with it?

ypipe

No im not sure what year 3 wire was used. I called bosch and the part number i listed (the one i used) wass a 4 wire universale GM, TPIs told me to use a 3 wire. Bosch said the only dif between 3 and 4 wire is an extra cpu ground wire which is not alwaays nessassry to use. As far as all the other parts im useing. wiring harness and stock CPU fromm 88 firebird 305 with all stock sensors for a 305 except the knock sensor. motor is a 1990 350 from a truck to inclued TBI. Have had no problems what so ever this far and it runs great so the need for a 350 chip is not nessassry all my readings are well within acceptable limits!

The gray wire i ran to chassie ground along with 1 white wire