Code 42: EST Circuit Grounded (HEI Module Fail) ???
03-25-2006, 04:47 PM
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Car: 1984 Trans Am
Engine: BuiLt 350! Hooker 2055's
Transmission: T5-manual trans-centerforce clutch
Code 42: EST Circuit Grounded (HEI Module Fail) ???
just pulled the code in the title, car runs really well jsut has some idle issues n what not, so what all does that code tell me, need a new distributr? its a new cap and rotor and coil and ICM. Thanks for repsonse.
03-25-2006, 11:41 PM
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Car: 1992 RS / 1989 RS
Engine: 3.1L MFI / Vortec 383 TBI
Transmission: T5 / LS-T56
Axle/Gears: 3.42 open / 3.73 Eaton posi
I'm going through the same stuff with my RS. I've had it quit running while driving down the street, then it fired up (stick shift), and I was ok until I was stopped at a red light, would not start up for about 20 minutes. Everything under the hood is new, engine, all ignition parts. I'm thinking maybe an intermittent ignition control module in the distributor or possibly a bad coil from Autozone. I'll probobly end up having both coil and distributor replaced since they are still under warranty.
05-17-2006, 01:49 AM
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Car: 1984 Trans Am
Engine: BuiLt 350! Hooker 2055's
Transmission: T5-manual trans-centerforce clutch
in your case i'd say the icm. they are known to work off and on when they crap out like your saying. happened to me and i replaced, but since i got this code i replaced whole distributer and im still getting it........................................
05-17-2006, 02:36 AM
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Car: too many ...
When you set the timing on a TPI car you have to disconnect a plug on the pass side of the engine bay by the fan blower motor. When the car is started up to set the timing the ECM will get a code 42 because that plug is disconnected. Even when you re-connect the plug the ECM will still have the error code stored. What I would do is first make sure that plug is connected (if you cant find it, do a search on EST Plug and you'll find pictures of the plug). Next after thats connected then I would clear the codes in the ECM by disconnecting the battery for 5 or 10 minutes. Then I would start it back up and pull the SES codes again. If you still have a code 42 then you will need to do troubleshooting. The EST system involves the EST module in the distributor (or as some call it the ICM), the ECM itself, and the knock sensor. If you do a search on EST you'll probably find a post I started where someone posted an awesome troubleshooting chart for troubleshooting EST issues, only thing is you'll need a dwell meter.
05-17-2006, 07:11 PM
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Car: 1984 Trans Am
Engine: BuiLt 350! Hooker 2055's
Transmission: T5-manual trans-centerforce clutch
kool ill look for it, im a carb though and no knock sensor on 84' but i do also disconnect something when doing timeing so ill check it out, thanks
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