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Username Post: ECM 1227747 PROM        (Topic#359426)
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-09-20 07:16 PM - Post#2784087    

I think I found the culprit for alot of my problems, but have yet to find a solution. The EPROM in my 1992 K1500 ECM (service number:1227747 86ASDU K101981443) is a Hypertech 120222, and it's for a 1990 model. I have another ecm with the PROM

Top:Delco
Middle:ACSF
Bottom:9968

Does anyone know anything about these? My ecm BCC is ASDU, and I don't know if that's relevant. But i've been online searching for 2.5 hours and cant find anything on this PROM or any cross references for my ECM.

92' 4x4 K1500


 
stumppuller 
"9th Year" Gold Supporting Member
Posts: 877
stumppuller
Loc: Canada
Reg: 11-01-04
01-09-20 08:53 PM - Post#2784092    
    In response to EdelbrockEverything92

All you had to do was ask ;

ASDU

Year - 1990
ECM - 1227747
Prom ID - 9567
Platform Code - C1, C2, G1, G2, G3, K1, K2, R1, V1
Engine - L05 (5.7L)
Transmission - MD8 Auto (700R4)
Gear Ratio - GT4, GT5, GU4, GU6
Emissions - NA5, NA6, NM8


ACSF

Year - 1987
ECM - 1227747
Prom ID - 9968
Platform - R1
Engine - L05 (5.7L)
Transmission - MD8 Auto (700R4)
Gear Ratio - N/A
Emissions - NA5, NA6

NA5 = Federal Requirements
NA6 = Altitude Requirements
NM8 = Leaded Fuel


It appears your spare ECM was only used in the last year of the square body style trucks (73-87), and only on the 1/2 ton 2wd. It might work, I don't really know how much changed as far as the TBI Engine from 87 to 88. As it's the same ECM, the wiring input/outputs will be the same.

-91 Sierra C2500, now K2500
-81 Chev K20


Edited by stumppuller on 01-09-20 09:00 PM. Reason for edit: No reason given.

 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-09-20 09:19 PM - Post#2784095    
    In response to stumppuller

I've been trying to figure out a problem for a few months now and just noticed something when I was setting the timing a few days ago. It's had an issue with an erratic idle, and I noticed with the electronic advance unplugged, it idles spot on the 0° mark all day long. When I plug the advance up, it won't stay steady at any mark. It just bounces all over the place. I'm trying to determine if it's a problem with the ecm or prom/calpack. I've already replaced every sensor and fuse in the truck, along with the entire emissions and cooling systems. But now that I put in a brand new distributor and module a few days ago, I noticed the idle thing and am convinced it's electrical. It's definitely something to do with the electronic advance that makes it just go suddenly stupid. By the way, I just tried the other ecm and every combination of prom/calpacks I have, and there are no differences between the 2. You'd think being almost $10,000 into a project, it'd be getting somewhat easier...but not this truck

92' 4x4 K1500


 
stumppuller 
"9th Year" Gold Supporting Member
Posts: 877
stumppuller
Loc: Canada
Reg: 11-01-04
01-09-20 09:37 PM - Post#2784099    
    In response to EdelbrockEverything92

The idle timing on these trucks is quite "twitchy" when controlled by the ECM, but shouldn't produce an unstable idle.

- Do you have a stock/computer friendly cam in the motor?

- Running a regular timing chain?

- Is the back and forth play in the distributor rotor normal?

- Can you hook a scanner up to the motor and see if the ESC is seeing knock counts when the idle acts up.

A common cause of idle issues on these motors is a leaking throttle baseplate gasket. Also make sure you have a Delco/Delphi EGR valve and EGR solenoid. Any change to the input parameters of the ECM (TPS, MAP, etc) will cause the timing to jump quite a bit at idle, then hunt a bit until it settles down.

-91 Sierra C2500, now K2500
-81 Chev K20


 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-09-20 10:23 PM - Post#2784101    
    In response to stumppuller

The tps and map are brand new, and I just replaced the egr and egr solenoid a few weeks ago, so those are all good. It used to idle around 1400 when I first got it. I replaced everything short of the block under the hood, and now it idles around 600. It had a Comp Cam kit put in it before I bought it, but the guy is in prison now and I have no way of knowing exactly what model, without tearing it all the way down. It has a Comp Cam sticker on the fan shroud that says #12-207-2, 12-208-2, 12-206-2, 12-314-4, 12-310-4, 12-312-4, 12-402-4, 12-106-3, 12-400-4, 12-210-2, Set curb idle to 650 rpm, Carb Executive Order D-279-7. I've tried to look these up and several times come up with nothing. Its also got 1008811 aluminum heads, edelbrock 3704 intake, and a new ac delco pro ignition coil. Just about the only thing I personally haven't replaced is the alternator, and it runs exactly the same with the battery disconnected. I've had it exactly 1 year now, and it's got me all the way confused.

92' 4x4 K1500


 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-09-20 10:24 PM - Post#2784102    
    In response to EdelbrockEverything92

Oh, and the throttle body has a cap over the idle adjust screw

92' 4x4 K1500


 
stumppuller 
"9th Year" Gold Supporting Member
Posts: 877
stumppuller
Loc: Canada
Reg: 11-01-04
01-09-20 10:53 PM - Post#2784106    
    In response to EdelbrockEverything92

An aftermarket Cam and Heads on a TBI motor without proper tuning may be part of your problem.

One thought, try unplugging the knock sensor and see if the timing at idle settles out. I don't believe it will set a code unless you drive it with the sensor unplugged.

-91 Sierra C2500, now K2500
-81 Chev K20


 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-09-20 11:05 PM - Post#2784107    
    In response to stumppuller

I'll try it first thing tomorrow. My free flowing shorty headers and dual Magnaflows aren't really "neighbor friendly" 😂

92' 4x4 K1500


 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-10-20 10:34 AM - Post#2784129    
    In response to EdelbrockEverything92

I did it, and it's still acting the same as it does plugged in

92' 4x4 K1500


 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-10-20 10:35 AM - Post#2784130    
    In response to EdelbrockEverything92

It idles at 21° and 550-560 rpm

92' 4x4 K1500


 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-10-20 10:38 AM - Post#2784131    
    In response to EdelbrockEverything92

Well, 527-560

92' 4x4 K1500


 
stumppuller 
"9th Year" Gold Supporting Member
Posts: 877
stumppuller
Loc: Canada
Reg: 11-01-04
01-10-20 11:55 AM - Post#2784135    
    In response to EdelbrockEverything92

How's the engine vacuum look at idle?

Steady/Fluctuating/Too low?


Also, check that all the grounds are in good shape. These have been known to cause many strange issues as they age/corrode. I believe the ECM's main grounding points are at one of the thermostat cover bolts.

-91 Sierra C2500, now K2500
-81 Chev K20


 
65_Impala 
Very Senior Member
Posts: 4368

Reg: 12-29-02
01-11-20 05:50 PM - Post#2784209    
    In response to EdelbrockEverything92

You're going to have to tune it with the intake, heads and cam being swapped like that.



 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-12-20 12:20 AM - Post#2784222    
    In response to 65_Impala

Well, I know for sure the heads belong with the block because it came out of an 87 Corvette and those are the factory numbers. But I called Comp Cams yesterday and got the exact model.
https://www.compcams.com/dual-energy-203-212-h ydra...
As far as the specs go, it's all Chinese to me, but maybe i'll be able to find someone who knows more about it.


92' 4x4 K1500


 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-12-20 12:29 AM - Post#2784223    
    In response to EdelbrockEverything92

I checked all the vacuums a couple weeks ago and they were all good, with no leaks. I did pull a code 42, but it's got a new coil, distributor, and module. Checked the egr, the solenoid, map, and tps numbers with a multimeter and swapped in and out with the old ones, and everything is in order there. I spent all of yesterday checking the electrical aspects that I was capable of and everything I looked at checked out good. I'm thinking about just ordering a Jet stage 2 chip from Summit and let them program it based on what I have

92' 4x4 K1500


 
65_Impala 
Very Senior Member
Posts: 4368

Reg: 12-29-02
01-12-20 07:52 AM - Post#2784237    
    In response to EdelbrockEverything92

Heads and block might be from a Vette, but they're not from a truck so the truck calibration won't run it correctly.

I would go to dynamicefi.com, gearhead-efi.com and moates.net and do more research. Either work at tuning yourself or find a tuner that can do it (not tbichips) which are getting few and far between.

You'll probably also need to do some fuel system changes to be able to get more fuel to the engine so it doesn't go lean on the top end.

I'm doubt Jet can get the tune right for it.



 
EdelbrockEverything92 
Newbie
Posts: 28

Age: 35
Loc: Arkansas
Reg: 04-17-19
01-12-20 08:07 PM - Post#2784292    
    In response to 65_Impala

I actually started looking for a place that has the capabilities today. Unfortunately it looks like that's not a high demand service around Little Rock, Arkansas. I'm kinda running out of options here, aside from selling it and taking almost a $6,000-$8,000 loss. The motor was freshly rebuilt and came as it sits in the truck right now with around 10,000 miles on it. The guy I bought it from only cared about the "right now" aspect of everything, and apparently had a tweaker do the motor swap who obviously didn't account for any details outside of it being able to start and drive, regardless of how it ran. I've had it exactly 1 year and replaced almost everything from road to roof, and narrowed it down to whatever this electronic problem is, and it's driving me absolutely crazy, lol.

92' 4x4 K1500


 
65_Impala 
Very Senior Member
Posts: 4368

Reg: 12-29-02
01-13-20 06:59 AM - Post#2784306    
    In response to EdelbrockEverything92

You don't need a local tuner, you just need to be able to do the local work required for the tuner to be able to do their thing remotely. If you get the right tools, a tuner can get it done for you via email. Go ask at gearhead-efi for a tuner recommendation.



 
Crazyxxxinsane 
Newbie
Posts: 2

Age: 38
Loc: Wisconsin
Reg: 01-15-20
01-15-20 04:01 PM - Post#2784445    
    In response to 65_Impala

Just a heads up, that camshaft that was put in there is way too high of a lift for that TBI and ecu controlled timing. been there quite a few times. I messed around with both my TBI trucks and unless you get higher flow TBI injectors, it will run erratic, up and down, or just spit at you and give you the finger pretty much. The stock injectors on the TBI do not flow enough fuel rate to run properly. Once I took the .420 lift cam out of my engine and put an RV cam out of a 5.7 TBI, it leveled out and i was able to re-do the timing properly and still get a better kick out of it than a stock camshaft. The guy that had the truck before you, and whomever else messed with it knew nothing about matching the heads, cam, and intake. The TBI systems are real "finicky" with the computer and the timing. Also, if the timing is upgraded, make sure it is a double roller timing chain, no gears or anything else, it messes with the computer and the knock sensor. Here is the spec of the Camshaft that was supposed to be in there:::

Intake Advertised Duration (Deg): 258 Degree
Exhaust Advertised Duration (Deg): 269 Degree
Lifter Type: Hydraulic
Exhaust Duration At 0.050 Inch Lift (Deg): 203 Degree
Intake Duration At 0.050 Inch Lift (Deg): 194 Degree
Intake Valve Lift (in): 0.390 Inch
Exhaust Valve Lift (in): 0.409 Inch


You can buy one from Melling with lifters for about $100 or less

1994 K1500 4x4 w/1985 K5 Blazer 350 4 bolt Main, Hypereutectic Flattop pistons, Forged rings, Howards .480/.480 cam, double roller timing chain, port/polished heads, performer intake
1998 K2500 HD stock 350 Vortec (for now)


Edited by Crazyxxxinsane on 01-15-20 04:13 PM. Reason for edit: No reason given.

 
CowboyTrukr 
"8th Year" Silver Supporting Member
Posts: 4330
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-15-20 10:50 PM - Post#2784461    
    In response to Crazyxxxinsane

Yup. Melling MTC-1. Computer compatible and great torque.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
bowtie44s 
Valued Contributor
Posts: 4258
bowtie44s
Age: 37
Loc: wv
Reg: 08-29-12
01-16-20 02:30 PM - Post#2784491    
    In response to CowboyTrukr

I put a Melling mtc-1 in my brother's 95 because Greg spoke so highly of it. It made a huge difference. No check engine light and not rich or lean anywhere. I don't have any dyno numbers, but it feels about like 30hp and 50 lb/ft. It's about as much difference as a 305 and a 350.

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
Crazyxxxinsane 
Newbie
Posts: 2

Age: 38
Loc: Wisconsin
Reg: 01-15-20
01-16-20 06:04 PM - Post#2784506    
    In response to bowtie44s

And they are decently priced, i never had an issue with melling cams

1994 K1500 4x4 w/1985 K5 Blazer 350 4 bolt Main, Hypereutectic Flattop pistons, Forged rings, Howards .480/.480 cam, double roller timing chain, port/polished heads, performer intake
1998 K2500 HD stock 350 Vortec (for now)


 
65_Impala 
Very Senior Member
Posts: 4368

Reg: 12-29-02
01-16-20 09:06 PM - Post#2784519    
    In response to Crazyxxxinsane

With tuning and modifications to support the fuel required, there is absolutely nothing wrong with that cam, and your engine combo should be a decent match with it. In fact, when I saw the cam specs my first thought was that should be a pretty good cam for your setup.

I've run larger cams with TBI that ran 100% fine once tuned. Early on when I was playing with EFI I ran a 350 with TBI running a Crane cam I think it was their old 268 cam with 218/228 duration and 468/480 lift and that combo ran great.




 
bowtie44s 
Valued Contributor
Posts: 4258
bowtie44s
Age: 37
Loc: wv
Reg: 08-29-12
01-17-20 08:07 AM - Post#2784525    
    In response to Crazyxxxinsane

$125 for cam and lifters. Obviously you'll need intake, timing cover, and oil pan gaskets.

https://www.summitracing.com/parts/mel-cl-mtc-1/

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


Edited by bowtie44s on 01-17-20 08:09 AM. Reason for edit: No reason given.

 
65_Impala 
Very Senior Member
Posts: 4368

Reg: 12-29-02
01-17-20 05:01 PM - Post#2784564    
    In response to bowtie44s

It's a L98, not a TBI engine a cam change probably won't fix it. The L98 has better flowing heads and more compression compared to a TBI engine which means you're trying to push the TBI injection even further than you do when putting that Melling cam into a TBI engine. At the least, the top end will likely go lean.

What's odd is that a 87 Vette engine would have a factory roller cam so it seems rather silly that it was replaced with a flat tappet cam.



 
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