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Old 03-12-2014, 05:40 PM   #1
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Unable to start sometimes. Unable to pull codes. Please help.

I've got a 94Z. Sometimes it has just shut off in the middle of the highway after running fine. Sometimes it won't start. Sometimes it starts up for a brief moment and shuts back off. I can sit there cranking it for over a minute sometimes and it will eventually fire. During those time I can smell fuel accumulating and coming out of the exhaust. I bought an obd1 scanner but I'm not getting any codes. However, the SES light is on whenever I'm driving. I'm so lost. Please help. Thanks.

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Old 03-12-2014, 08:27 PM   #2
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Re: Unable to start sometimes. Unable to pull codes. Please help.

What scanner? Some of the dual OBD-1/OBD-2 scanners will not work on the LT1 PCM. Possibly they are looking for a 12 volt pin in the ALDL connector, and there is none. One, the Innova seems to pull the same incorrect codes on every 94/95 it scans.

Check the "Computer Diagnostics....." forum stickies for the link to a free download of OBD-1 scanning software written specifically for the 94/95 LT1. Works great.
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Old 03-14-2014, 03:14 PM   #3
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Re: Unable to start sometimes. Unable to pull codes. Please help.

I forget the brand. Its whatever they had at Advance Auto parts. It delivers a series of blinks to the dash which you are able to look up in a reference guide of some sort. Guess I got the wrong one.

I don't believe this a dual-scanner because I have a 94 obd1 PCM and harness/connector, which is different than what was on my '95.

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Old 03-14-2014, 04:02 PM   #4
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Re: Unable to start sometimes. Unable to pull codes. Please help.

If those cars were both F-bodies, the 95 is an OBD1 pcm also. It just has an OBD2-style connector.
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Old 03-14-2014, 04:24 PM   #5
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Re: Unable to start sometimes. Unable to pull codes. Please help.

Quote:
Originally Posted by Kurt Crosbie View Post
I forget the brand. Its whatever they had at Advance Auto parts. It delivers a series of blinks to the dash which you are able to look up in a reference guide of some sort. Guess I got the wrong one.

I don't believe this a dual-scanner because I have a 94 obd1 PCM and harness/connector, which is different than what was on my '95.

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They were using a "scanner" that basically shorts 2 pins on the ALDL connector, to flash the codes on the SES light. 1993 is the last year that worked on the LT1.
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Old 03-27-2014, 11:17 AM   #6
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Re: Unable to start sometimes. Unable to pull codes. Please help.

I'm curious if there was a resolution to this Crosby?
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