Ignition Control Module
01-26-2016, 10:15 PM
#1
Member
Thread Starter
Join Date: Aug 2012
Location: florida
Posts: 126
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Ignition Control Module
i was going to buy a cheap ICM on ebay for my 86, 4bbl, 305 trans am because they are super cheap but none of them fit my application despite the fact that they look identical to mine. i went to amazon and they said that the part numbers that WON'T work on ebay will work with my car. so now i'm stymied. what is different about my car from all the other 305's out there?
Last edited by dragsta; 01-26-2016 at 10:19 PM.
01-26-2016, 11:04 PM
#2
Senior Member
iTrader: (8)
Join Date: Aug 2011
Location: Texas
Posts: 661
Likes: 0
Received 7 Likes
on
7 Posts
Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: Ignition Control Module
You probably have the LG4. Others are the L69 High Output, LB9 TPI, and L03 TBI just to name a few.
02-02-2016, 06:48 PM
#3
Member
Thread Starter
Join Date: Aug 2012
Location: florida
Posts: 126
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Re: Ignition Control Module
OK, i just went ahead and replaced the ignition module and still no spark. i have 12v coming into the distributor in the pink wire and -for what it's worth- 4.5v in the yellow wire. what does it all mean? how do i check the coil?
02-02-2016, 07:04 PM
#5
Senior Member
iTrader: (8)
Join Date: Aug 2011
Location: Texas
Posts: 661
Likes: 0
Received 7 Likes
on
7 Posts
Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: Ignition Control Module
This is out of an '88 Firebird service manual. Hope it helps. Are you getting anythings coming out of the distributor?
02-02-2016, 07:40 PM
#6
Member
Thread Starter
Join Date: Aug 2012
Location: florida
Posts: 126
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Re: Ignition Control Module
yes, the car is all stock. the coil is in the distributor.
antares: i'll check out that coil test page but it's different from mine. i turned on the ignition and poked around with my voltmeter but i don't know what i'm doing. there's 12v going into the ignition module on the pink wire and 5v in the yellow wire.
antares: i'll check out that coil test page but it's different from mine. i turned on the ignition and poked around with my voltmeter but i don't know what i'm doing. there's 12v going into the ignition module on the pink wire and 5v in the yellow wire.
02-02-2016, 11:38 PM
#7
Senior Member
iTrader: (1)
Join Date: Dec 2012
Location: Western NY
Posts: 629
Likes: 0
Received 2 Likes
on
2 Posts
Car: 88 convertible
Engine: 5.7L
Transmission: 4+3 maual
Axle/Gears: 3.07
Re: Ignition Control Module
Go to Chevythunder.com and check the HEI/EST section. Very comprehensive and lots of pics and diagrams with trouble shooting sections. HTH!
Trending Topics
02-02-2016, 11:57 PM
#8
Supreme Member
iTrader: (13)
Join Date: Dec 2002
Location: Bowdon, GA.
Posts: 2,535
Likes: 0
Received 16 Likes
on
14 Posts
Car: 1988 Camaro
Engine: 355, 10.34:1, 249/252 @.050", IK200
Transmission: TH-400, 3500 stall 9.5" converter
Axle/Gears: Ford 9", detroit locker, 3.89 gears
Re: Ignition Control Module
I have seen many dead brand new out of the box ICMs. Take the ICM to a local auto zone, advance auto, etc and have them test it.
If the ICM is good and no spark, it's the coil or pickup.
If you want used, I have a whole dist. with coil, cap, rotor, ICM, etc removed from a running '84 z28 with LG4 305.
I have it listed on CL for $60. I will do $65 shipped. http://atlanta.craigslist.org/wat/pts/5425550844.html
If the ICM is good and no spark, it's the coil or pickup.
If you want used, I have a whole dist. with coil, cap, rotor, ICM, etc removed from a running '84 z28 with LG4 305.
I have it listed on CL for $60. I will do $65 shipped. http://atlanta.craigslist.org/wat/pts/5425550844.html
02-03-2016, 07:13 AM
#9
Member
Thread Starter
Join Date: Aug 2012
Location: florida
Posts: 126
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Re: Ignition Control Module
ok, thanks for the replies. i'll take that ignition module for testing then go from there. will also check out, chevythunder.
night rider; if all else fails i'll keep your parts in mind.
night rider; if all else fails i'll keep your parts in mind.
02-03-2016, 10:47 AM
#10
Junior Member
Join Date: Apr 2010
Location: Waxahachie, TX
Posts: 58
Likes: 0
Received 1 Like
on
1 Post
Car: 92 Firebird Convertible
Engine: 383 - First Fuel Injection TPI
Transmission: 700R4
Axle/Gears: 3:23
Re: Ignition Control Module
This site has good info as well: http://easyautodiagnostics.com/gm/4....ed-icm-tests-1
Had issues with a new ICM - took it to Auto Zone and it tested ok - but still no spark.
Set up my own test and the module wouldn't fire a spark plug. Replaced the module with one that would fire a plug and it fired right up!
Had issues with a new ICM - took it to Auto Zone and it tested ok - but still no spark.
Set up my own test and the module wouldn't fire a spark plug. Replaced the module with one that would fire a plug and it fired right up!
Thread
Thread Starter
Forum
Replies
Last Post
89irocz355
Interior Parts for Sale
33
10-08-2023 12:59 PM
Bohemian
Tech / General Engine
4
06-03-2021 01:07 PM
89irocz355
Exterior Parts for Sale
25
04-07-2016 03:34 AM
89irocz355
Engine/Drivetrain/Suspension Parts for Sale
8
12-26-2015 07:44 AM