scratching my head on this one.. 1991 kodiak no start

[cookie 70]

When an engine briefly runs after pouring fuel into the throttle body indicates a fuel problem.

Possibly the rapid flashing check engine light is bad chip.

I favor troubleshooting the rapid flashing of the check engine light first, by replacing the current chip with a known good chip.

the original chip is toast, im using 27FS512 chips (brand new) with the bin you uploaded. im wondering is im missing something, or if i dont have something just right when i burn the chip.

As far as i know, i have the offsets set right. I'm using BoostedNW chip burning software and Tuner RT to verify everything is right (possibly).
I've become fairly familiar with this software from tuning and playing with my '88 Trans-am Gta, i know it's a different ECM but shouldn't it be the same as far as tuning?


I really do appreciate ya'll taking the time to assist me throught this!

[dave w]

ECM 16147525 Uses a 4K chip, 24 pin. Is this original computer part number and chip for your Topkick?

The 27SF512 chip is a 64K chip, 28 pin. What chip adapter 24 pin to 28 pin is being used?

Possibly the chip is installed backwards?

[cookie 70]

current ECM# 19186079, which i was told was an updated replacement for the 16147525. when purchased that was all i could find in stock.
The adapter i am using is the solder in GM2 adapter ( replacement of the Moates G2 i used in the past) from boosted NW.
Chip is installed in correct orientation because if installed backwards it will kill the chip.

[dave w]

current ECM# 19186079, which i was told was an updated replacement for the 16147525. when purchased that was all i could find in stock.
The adapter i am using is the solder in GM2 adapter ( replacement of the Moates G2 i used in the past) from boosted NW.
Chip is installed in correct orientation because if installed backwards it will kill the chip.

GM2 Adapter.jpg
The installation of the GM2 likely OK. The soldering required for the GM2 is basic through hole soldering. An ohm meter can be used to test for solder bridges between pins, which might cause the check engine light to flash.

I'm going to disagree with the statement that the 19186079 is a replacement for 16147525. Form what I can figure out, the 19186079 is for 1989 ~ 1990 Topkick. GM used the same 4K chip for many different computer part numbers, but each computer part number always used a different definition file. I recommend using a .bin file for the 19186079, if the ECM wiring is the same 19186079 vs. 16147525.

[dave w]

Interesting thread:

http://www.gearhead-efi.com/Fuel-Inj...light=16147525

[1project2many]

Basic information to help with diagnosis:

The ignition module will fire the coil without a working ECM. Checking for spark while cranking only tells you the coil and pickup coil is working and that the ignition module is partly working.
The ignition module will send a pulse to the ECM for each spark made at the coil.
The ECM will use pulses from the coil to fire fuel injectors.
If you install a noid light at the injector and spark tester on the coil wire you should see noid light blink when spark tester sparks. The "netres" or backup fuel hardware will make this happen even if the calibration in the eprom is bad.

[cookie 70]

I'm going to disagree with the statement that the 19186079 is a replacement for 16147525. Form what I can figure out, the 19186079 is for 1989 ~ 1990 Topkick. GM used the same 4K chip for many different computer part numbers, but each computer part number always used a different definition file. I recommend using a .bin file for the 19186079, if the ECM wiring is the same 19186079 vs. 16147525.

What are the main differences?

[dave w]

I'm thinking the main difference between the 19186079 and the 16147525 is obviously the hexadecimal address in the chip and the associated electronics inside the computers.

For example,
1987 ~ 1991 TBI computer 1227747 uses definition $42 vs. the 1992 TBI computer 16146299 uses definition $99; both use the same 4K chip. The programming hexadecimal code is very different $42 vs. $99 and likely different electronics for things like the Injector Drivers, IAC, TPS, Knock Sensor, and others.

It would be a VERT BAD Thing if somehow a 1227747 computer chip was installed into a 16146299 computer and vise - versa.

Basically installing a 16147525 chip into a 19186079 would be considered a VERY BAD Thing too.

[cookie 70]

i see what you mean, i lucked up and finally found the proper ECM from a heavy duty salvage yard up north (im down in the bible belt) and they are gonna ship it in the morning.

until then i am going to focus on the other issues and report back ASAP.