Setting timming with engine knocking
Thread Starter
Junior Member
Joined: Nov 2004
Posts: 26
Likes: 0
Car: 1984 FIREBIRD
Engine: 305
Transmission: AUTOMATIC
Setting timming with engine knocking
I installed new timming chain engine runs good but has knock.
I belive the knock is do to timming needing adjustment.
But if the knock sensor is retarding the ignition because of knock how should I set the initial timming.
Car is all stock no mods other than I removed air pump.
Distributer is for VIN code G but cars vin code is H
Previous owner apparently replaced the computer it has 95 writen on it with yellow marker ?????
305 with rochester quadrajet.
I belive the knock is do to timming needing adjustment.
But if the knock sensor is retarding the ignition because of knock how should I set the initial timming.
Car is all stock no mods other than I removed air pump.
Distributer is for VIN code G but cars vin code is H
Previous owner apparently replaced the computer it has 95 writen on it with yellow marker ?????
305 with rochester quadrajet.
Supreme Member
iTrader: (4)
Joined: Oct 1999
Posts: 4,211
Likes: 3
From: GO PACK GO
Car: 83Z28 HO
Engine: Magnacharged Dart Little M 408
Transmission: G Force 5 speed
Axle/Gears: Moser 9" w/Detroit Trutrac
The G and H vin code distributors are the same AFAIK....
When you disconnect the 4 wire connector to set initial timing, the knock sensor doesn't work anyway till you plug it back in. If it's knocking after that, you might have another problem...
You'd have to look up the part # on the computer you have in it now, but chances are it's still for a CC carb system so it shouldn't change anything much I would think.
try setting the initial timing for LG4 specs, and if that doesn't work, set it for L69 specs and see if that helps any. Good luck with it!!
When you disconnect the 4 wire connector to set initial timing, the knock sensor doesn't work anyway till you plug it back in. If it's knocking after that, you might have another problem...
You'd have to look up the part # on the computer you have in it now, but chances are it's still for a CC carb system so it shouldn't change anything much I would think.
try setting the initial timing for LG4 specs, and if that doesn't work, set it for L69 specs and see if that helps any. Good luck with it!!
Supreme Member
Joined: Sep 1999
Posts: 7,072
Likes: 13
From: Philly, PA
When setting the base timing (which I agree you need to check again) you can unplug the 4-wire plug behind the distributor (on top of the bellhousing) as described, above OR..... you can just jumper the A&B terminals of the ALDL connector under the dash and achieve the same thing.
In either case you want to have the car turned OFF when you connect/disconnect them. Don't be plugging/jumping stuff that goes to the ECM while the motor is running. Not that it will definitely blow stuff out (never happened to me), but it could and that's reason enough to be careful.
With the computer supplied timing taken out using one of the above methods your initial timing for a stock engine would be:
LG-4: 0* BTDC
L-69: 6* BTDC
Your timing tab is located straight down behind the water pump.
In either case you want to have the car turned OFF when you connect/disconnect them. Don't be plugging/jumping stuff that goes to the ECM while the motor is running. Not that it will definitely blow stuff out (never happened to me), but it could and that's reason enough to be careful.
With the computer supplied timing taken out using one of the above methods your initial timing for a stock engine would be:
LG-4: 0* BTDC
L-69: 6* BTDC
Your timing tab is located straight down behind the water pump.
Thread
Thread Starter
Forum
Replies
Last Post
