Timing my LG4 Please Help!!!
#1
Junior Member
Thread Starter
Join Date: Dec 2005
Location: Viroqua, Wi. 30 miles south of LaCrosse
Posts: 28
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87' Firebird Formula
Engine: lg4 305
Transmission: 700r4
Axle/Gears: 3.73's finally
Timing my LG4 Please Help!!!
I have looked for hours for the est connector on my car and cannot find it. I even took all of the harnesses apart from the passenger fender to the back of the motor and no connector. There is a tan wire with a black tracer in one of the harnesses but it with acouple of other wires plug into the transmission. Is it a possibility that my 87 formula might be an early enough model that it might be the older style where you have to unplug the 4 wire connector on the back of the distributor? I did this and the car barely idles. Also, the only 1 wire connector (has an orange wire) that I can find under the hood rides along the passenger frame rail and actually is connected to the battery terminal cable. Is this it? Any help is greatly appreciated! Thanks, Bret
#2
Junior Member
iTrader: (1)
Join Date: Dec 2005
Location: Germany, nearby Saarbruecken
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 Firebird Formula
Engine: TBI, V8, 305cui, w. A/C
Transmission: TH700R4
Re: Timing my LG4 Please Help!!!
Your 87 LG4 does not have a single wire EST cable as described in some manuals ! Your EST connector is located on the backside of the distributor / ignition module (it is a 4 wire pigtail next to the pigtail with the the pink/white wires).
Just disconnect it and adjust the timing to 0 degree. Thereafter reconnect it, erase the ECM-SES failure code by disconnecting the battery for something about 30 seconds.
Thereafter - if you wish - you may observe an EST timing of approx 20 degrees (BTDC) according to the engine rpm. That would be normal, so don´t worry about this.
The tan/blk wire you have seen (together with a purple and a light blue wire) in the harness down to the white pigtail at the tranny is the TCC (torque converter clutch).
P.
Just disconnect it and adjust the timing to 0 degree. Thereafter reconnect it, erase the ECM-SES failure code by disconnecting the battery for something about 30 seconds.
Thereafter - if you wish - you may observe an EST timing of approx 20 degrees (BTDC) according to the engine rpm. That would be normal, so don´t worry about this.
The tan/blk wire you have seen (together with a purple and a light blue wire) in the harness down to the white pigtail at the tranny is the TCC (torque converter clutch).
P.
Last edited by Patrick Freitag; 04-11-2009 at 03:18 AM.
#3
Junior Member
Thread Starter
Join Date: Dec 2005
Location: Viroqua, Wi. 30 miles south of LaCrosse
Posts: 28
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87' Firebird Formula
Engine: lg4 305
Transmission: 700r4
Axle/Gears: 3.73's finally
Re: Timing my LG4 Please Help!!!
Thank you Patrick! Finally there is some sense now to what I was trying to figure out. Since I cant see the timing mark at all with the f wire connector unplugged, I know that my car is waaay out of time hence the car running absolute crap. Thanks again so much patrick, Bret
#4
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 35 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Large cap distributor, coil-in-distributor - flat 4-wire connector.
Small cap distributor, divorced coil - single wire connector.
'87 came from the factory with the latter.
Small cap distributor, divorced coil - single wire connector.
'87 came from the factory with the latter.
Thread
Thread Starter
Forum
Replies
Last Post