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.
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
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
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).
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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
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:
- or -
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
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
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.
CHECKING AND ADJUSTMENT
HEI Systems
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