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TBI Help

sunnyc123abc

sunnyc123abc

1/2 ton status
Joined
Mar 12, 2005
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Location
SoCal
So I am trying to fuel inject my 350 84 blazer. Everything is hooked up, computer is out of a 87 pickup. Found out that injectors were bad, so I picked up some injectors at the junkyard. The truck will kinda run for about 2 sec. , but I have to have the gas pedal to the floor. I should mention that the injectors I picked up are for a 5.0L. Would this cause my problem?
 
it has an external pump. I got it running now, ground to the coil wasn't good. its running pretty rough, but the more i run it the smoother its getting. Im thinking its the old gas in the tank. Plus there is a ton of smoke coming from the exhaust. I also notice that when i let it idle it would go up slow to 1200, then come down a little, then go back up.
 
Computer out of a 305 too?

Injectors are wrong, you NEED a set of 350 injectors and PROM to match.

As a bandaid you could up the fuel pressure, but right now, you are running lean under WOT and open loop operation, and that WILL kill a motor over time.
 
How could I check if the computer is 305. Also, I have a pair of injectors from a BB. Would it be better to use those for the time being?
 
I'd have to look at the injector lb/hr rating to see. Probably not, you'd wash the cylinders with fuel.

Post up the Broadcast Code (BCC) from the PROM. Usually four letters, AWGH for a made up example.

Really doesn't matter 305 or 350 computer with 305 injectors, on a 350 motor, will still run lean.
 
I got some 350 injectors today but i think the prom I have is for a 4.3. BCC is AKMH. I have another prom ACLX, but i can't find out wats its for. I grabbed it from an late 80's sub.
 
Thats all I could find on it. I *think* dave w on this site has experience with that BCC, I saw the same username on thirdgen.org (always do a search for whatever BCC there first) mention that BCC and 454.
 
I emailed Brain at tbichips.com and he said it was 454 so yea. What are the prom codes for a 350? Im going to head to the junkyard tomorrow to grab some.
 
There are a huge number of them available. Your best bet would be to find a early 90s 3/4 ton or 1 ton truck to pull the chip and injectors from. Pretty unlikely that you'll find a 305 in one of those trucks.
 
The smaller chip is a ROM (Read Only Memory) chip. I am not entirely sure what info is stored on it, but I've always kept them paired with the bigger PROM
 
I have several factory chips here i'm not using. I simply pulled them and read them with my chip reader and saved a copy for future reference. If you need one i'd be happy to umm make a deal. IIRC you cannot PM me without being a member?

So that you can research beforehand one of the chips i pulled from a 87 burb and that chip is AFBX was a 350/700R4 combo, the other is a ASDU and i unfortunately did not write down what it came from but i was only pulling chips from vehicles that had a 350/700R4 combo. I do have another but i'm keeping it because it was from a federal emission 89 blazer equipped exactly like mine but for your reference the chip code is ASDZ and was a 350/700R4 combo as well.
 
4X4HIGH said:
So that you can research beforehand one of the chips i pulled from a 87 burb and that chip is AFBX was a 350/700R4 combo, the other is a ASDU and i unfortunately did not write down what it came from but i was only pulling chips from vehicles that had a 350/700R4 combo. I do have another but i'm keeping it because it was from a federal emission 89 blazer equipped exactly like mine but for your reference the chip code is ASDZ and was a 350/700R4 combo as well.
Click to expand...

So the ASDU you pulled was from a 350/700R4 combo?

I picked up an ECM from a salvage yard today to hopefully fix my burb. The guy at the yard gave me a 1227747 ASDU.

My burb is an '87 TBI 350/700R4 and it's ECM says 1227747 AKAJ. Will it work?


*disclaimer* I am a TBI newb like no other:o
 
Here is a list of 350/700r4 Prom codes that Brain from tbichips.com gave me. CBU, AMY, ABHY, ABJM, ACSH, ACSW, AKAK, AKAL, AMUS, AKUT, AKWD, ANLX, ANLZ, ASDY, ASDZ, ANSZ, ANTB, ARJU, are all 1227747 350 TBI 700R4 California emissions prom codes.
 
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