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Author Topic: ECM?  (Read 1972 times)

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jeffreyeffrey

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ECM?
« on: August 15, 2013, 09:34:24 PM »

I've been prepping my front end and valance the last month for new paint. My buddy uptown called and said his PPG salesman was there and to run it up so we could get the exact shade of 8774 ordered. It hadn't ran for awhile so after I got uptown I let it idle for 20 minutes or so. After I figured it was charged up enough I walked over and shut it off. Twenty minutes later I get in to leave and it just turns over and over and over.

We didn't have time for any precision testing but here's what we were able to find out; There's pressure at the rail (shot up and hit the hood insulation). We pulled a plug and there's spark. What we did find that was not working was the injector(s). When we pulled an injector wire and put a tester bulb on it, it didn't light. So the three questions I'm mulling over is;

-Does the ECM power the injectors?
-If by coincidence the one injector wire we pulled was bad, would the car still run on the other 5?
-Why would a perfectly idling car not have injection after it was shut off?

No codes by the way, which is weird, because it was storing a 42 up until tonight... It did flash a 1-2 1-2 1-2 over and over which I think it means it's clear, but Would a fried ECM even flash a 1-2?

Thanks in advance.
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jeffreyeffrey

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Re: ECM?
« Reply #1 on: August 18, 2013, 01:40:40 PM »

Swapped ECM with one from a '90 supreme. Nothing...
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White93z34

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Re: ECM?
« Reply #2 on: August 18, 2013, 03:57:56 PM »

Check the basics, car needs air, fuel, spark to run do you have all 3?

Code 42 seems to point to Electronic spark control, chances are its been trying to tell you something. If I were to guess I'd check for spark and replace the ignition control module if no spark.
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-Chris D.


1992 Chevrolet Lumina Z34 3.4L TDC Hydramatic 4T60E
1990 Pontiac Turbo Grand Prix 3.1L v6 Hydramatic 4T60
1997  Pontiac Bonneville SSE 3.8L v6, Hydramatic 4T60E
1987 Chevrolet Camaro 5.0L v8, Hydramatic 700R4

GPChief

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Re: ECM?
« Reply #3 on: August 18, 2013, 06:08:45 PM »

Check the basics, car needs air, fuel, spark to run do you have all 3?

Code 42 seems to point to Electronic spark control, chances are its been trying to tell you something. If I were to guess I'd check for spark and replace the ignition control module if no spark.

X2
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2004 GTP -  3.8 Blown - Only modding for MPG.
1997 GTP  - 3.8 Blown - Too many mods to list.
1996 GTP - 3.4 DOHC - Twin to my 1997.
1995 SE - soon to be a 3.8 turbo car.
1990 TSTE x 2 white cloth
1990 TSTE x 1 maroon leather
1990 TGP - 5 speed.
 

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