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Old 01-31-2007, 06:15 PM   #1
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Default '94 troubles - ecu?

After 10 years of care free ownership, I finally ran into some problems this week. It first started with loosing the speedometer accompanied with a real high idle (2500 rpm). The next day almost no idle and frequent stalling after start up or at stop. Also would not start a couple of times but after waiting a few would start again. Still no speedo. Of course the check engine light is on but can't retrieve the code(*) due to the hybrid obd i/ii nonsense.

So I researched this site and others and seems the ECU might be the culprit so found a cheap used one on ebay. While I am waiting for it to arrive thought I would ask if anyone had other thoughts or suggestions. Also when the ECU arrives will I need to install the eprom from my old unit into the replacement? I assume I access to eprom through the cover on the back portion of the ECU?

Thanks in advance

'94 Bonneville SE approx 115K
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Old 01-31-2007, 08:02 PM   #2
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With the Acess Pannel removed you will need to swap out your factory EPROM from you old PCM into the new one..


Cover removed with EPROM

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Old 01-31-2007, 08:19 PM   #3
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Thanks much, the picture really helps. Should be a quick change out once I get the replacement. Hope that resolves the problem. Aside from the master cylinder and a couple of broken rear brake springs this has been one of the most sound cars I have ever owned (I have had my share).

Thanks again
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Old 01-31-2007, 08:25 PM   #4
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The 94-95'* were hard on PCM'*... GM only used this PCM for the 94-95 Model years in the C & H body as well as the U Body Minivan... I am on #3 at 154,000 miles, my 95 SE has been a reliable car for what I have put it through

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