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What is the base timing for a 1989 5.7L w/TPI and how to set it?

It has a remote coil HEI. I have set the timing by ear but I read that this could cause the code 42 (EST). If I can properly set the timing then the ECM will control the advance. The engine has an aftermarket cam (494l 290d) and shorty headers.

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  • Cars & Trucks Master
  • 42,022 Answers

Set the timing of the timing marks on the pulley. Set to factory and the cpu will adjust to the correct setting for engine rpm. Cams still run in the middle of the engine stroke . They only alter the timing that the valves open and close periods. Headers only allow the easier passage of the gasses

Posted on Apr 20, 2013

6 Suggested Answers

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Posted on Jan 02, 2017

shadtremonky
  • 353 Answers

SOURCE: Code 42 set on an '88 Camaro w TBI.Also very

listen to fuel pump w/ key on , if you hear a spraying sound, you may have a split hose in the tank

Posted on Jun 20, 2009

Mustgo
  • 2359 Answers

SOURCE: 2001 Miata check engine light on. [cause is P0012]

The cam angle sensor need to be replace. Once it's cooked it will never the same.

Have to consider moving to synthetic oil (Like Amsoil) or remove the front license plate (please check state regulation first).

=====

I'm using Amsoil Synthetic
10W-30 in summer and 5W-30 in winter

Use 65/35 Amsoil coolant mix ration instead of 50/50

Removing the license plate does help air flow.

Clean junk collect in front of the A/C condenser and radiator.

Check radiator cap's plastic gasket.
Get a Rad-Cap

Check/Clean the ECU contacts with CRC electronic part cleaner,

@ 85,000+ miles be prepare for timing belt + water pump change.

Clean / change temp sensor ///// monitor electric fan for operation.


Cam sensor can not be overheated.

<230 F is ideal

I listed everything that can keep the motor cool.



Please rate my answer if it's helpful to you.


Cheers,

MUSTGO

Posted on Dec 12, 2009

Molson02536
  • 3854 Answers

SOURCE: I have a 1992 gmc

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

Posted on Oct 10, 2010

  • 1114 Answers

SOURCE: 1987 GMC R1500 2WD Have replaced all electronics

Hello best solution have a scan completed at the dealer ship to pin point your trouble the usual cost is from $25.00 to $75.00 as mentioned guessing could be one of many things that could amount to hundreds of unnecessary dollars.A scan would be the best solution

Posted on Jan 04, 2011

honeymokey
  • 3113 Answers

SOURCE: i get a code 42

"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.

Posted on Aug 02, 2011

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Is this a 1990 jeep? and what engine? you never stated the engine
4.2 L AMC straight-6 engine?

what distributor are you running off what engine, and what year.
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the nutter bypass, 4.2L
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this means ECU advance is killed, on now only the dumb
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here is 7
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/ew7hei.gif


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You tune the spark advance for YOUR engine and setup.
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my guess, is you burned up the ballast when it hit the real
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the HEI would be running way too low , at 8v. running.
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http://www.crankshaftcoalition.com/wiki/Hot_rodding_the_HEI_distributor

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Hi, I have pasted the procedure below. Your spec is 0 degrees (right at TDC).


CHECKING AND ADJUSTMENT

HEI Systems

  1. Start the engine and allow it to reach operating temperature. Stop the engine and connect the timing light to the No. 1 (left front) spark plug wire, at the plug or at the distributor cap. You can also use the No. 6 wire, if it is more convenient. Numbering is illustrated in this section.

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