Question about 1992 Buick Roadmaster

1 Answer

How do I locate the EST(electronic spark timing) module so I can disconnect it in order to check ignition timing on a 1992 Buick Roadmaster?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Buick Master
  • 6,826 Answers

It is flat,and black in color,and has a wide flat connector with multi wires going to it.On firewall,or mounted on air cleaner housing.

Posted on Jul 08, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

No Start Troubleshooting 1992 buick road master


Changing the ignition might have interrupted the antitheft security system on your vehicle. (VATS) If you see a light on the dash that says SECURITY, this is a good indicator of this problem. This link explains the problem and offers solutions.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Feb 03, 2012 | 1992 Buick Roadmaster

1 Answer

I get a code 42 after driving car for a while, but if i shut off car the service engine soon light goes out. i have change the ecm,the ignition module, and coil pack, still have the same code issue (code...


"Code 42" would indicate that the Electronic Spark Timing (EST) signal did not change when the ECM applied bypass voltage to the ignition module. Check for faulty connections, or a faulty ignition module.

Aug 02, 2011 | 1992 Buick LeSabre

1 Answer

Engine stalls driving down the road or on take off. Had code 42. electronic spark tining. E S T circiut fault. Cleared codes and installed a fuel pressure gauge. On test drive the motor, (3.1 EFI) still...


Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system. During cranking, the timing is controlled by the ignition module and the ECM grounds the EST line. It expects to see no activity on this line at this time. When the ECM enters EST mode, it applies +5 volts to the BYPASS line and expects to see voltage variations on the EST line.
Reasons for the ECM to set Code 42:
1. System in BYPASS mode (i.e. EST line supposedly grounded) but activity sensed on EST line
2. System in EST mode (i.e. BYPASS line driven with +5 volts) but no activity seen on the EST line

Possible causes include:
1. BYPASS line is open or grounded
2. EST line is open or grounded
3. Poor connections between ignition module and ECM
4. Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise
5. Faulty or incorrect ignition module
6. Faulty ECM
7. Faulty Pick Up Coil
8. Faulty Ignition Control Module
9. Faulty Crank Sensor or the Crank Sensor magnet probe could be cracked

Jan 15, 2011 | 1991 Chevrolet Lumina

1 Answer

I have a 1992 gmc sonoma 2 wd 4.3L throtle body i am getting the service engine soon light and I checked the codes and I get number 42- Electronic spark timing bypass circuit or EST circuit is grounded...


CODE 42 Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system.
During cranking, the timing is controlled by the ignition module while the ECM monitors the engine speed. When the engine speed exceeds 400 RPM, the ECM sends a BYPASS signal to the ignition module which switches the timing to ECM control. The ECM calculates what the timing should be then "tells" the ignition module via the EST circuit.
An open or ground in the EST circuit will stall the engine and set a Code 42. The engine can be re-started but it will run on ignition module timing.
The conditions for setting this code are:
  • System in BYPASS mode but the ignition module is still controlling timing
    - or -
  • Engine speed > 600 RPM with no EST pulses (ECM controlled timing) going to the ignition module for 200 msec.


Typical causes for this code include:
1) BYPASS line is open or grounded
2) EST line is open or grounded
3) PROM or CALPACK not seated properly in the ECM
4) Poor connections between ignition module and ECM
5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise)
6) Faulty or incorrect ignition module
7) Faulty ECM


Thank you for using fixya and keep us posted

Oct 10, 2010 | 1992 GMC Sonoma

2 Answers

92 buick roadmaster won't start all it does is turn over.


did you check your starter bcuz your car has a seloniond on the starter you can try jumping the car and bypassing it but your best bet is to take your starter off and take to autozone or advance auto and see if its still any good and if it aint thats your problem

Apr 06, 2009 | 1992 Buick LeSabre

2 Answers

92 buick roadmaster won't start


What engine? What fuel system? TBI?

Apr 06, 2009 | 1992 Buick LeSabre

1 Answer

Engine misses with code 41 and service engine soon light on


The code 41 is indicating an EST control issue. I would check you connection at the ignition module, make sure the connector is locked securely and there is no corrosion in the connector or terminal pins on the ignition module.
The EST is your electronic spark timing control, the module is not switching over to ECM controlled timing. The ECM sets the code when it can not take over control of the timing. If the connections look good, you likely have an ignition module that has gone bad.
Good luck and let me know.
Regards,

Feb 24, 2009 | 1992 Buick LeSabre

1 Answer

Ignition Timing


How to check and adjust the timing
Disconnect the tan/black wire EST (electronic spark timing) by-pass connector located near the heater housing in the engine compartment on the S/T series, or near the distributor on all other V-6 models. Do not disconnect the four- (4) wire connector at distributor. Connect the timing light to the No. 1 spark plug wire. Check timing and adjust to "0" degrees BTDC. With the engine off, reconnect the EST by-pass connector and clear the ECM trouble codes by disconnecting the battery.

Aug 19, 2008 | 1991 Chevrolet Corvette

Not finding what you are looking for?
1992 Buick Roadmaster Logo

Related Topics:

317 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts

yadayada
yadayada

Level 3 Expert

76673 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8531 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...