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I did a obd2 fault test on my 1996 ford probe gt because it cranks over but won't start and the obd2 test shows nothing

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Does the OBD2 truly show nothing, or were there just no stored codes? You should have the ability to monitor the datastream of the supported sensors. If none of the datastream data is available, you probably have a fuse issue that feeds the PCM or the OBD2 port. If you are able to monitor the supported sensors but there are no diagnostic codes, you need to look at the various sensors to understand what's likely happening.

Of course if you don't have access to a scan tool with datastream mode, then you are somewhat limited to the old school method of determining what you have and what you don't have that an engine needs to start and run. Do you have spark? Do you have fuel? Do you have compression? A simple test for spark is to use a spark plug tester and see if you get a nice bright spark. If so, then try squirting a bit of throttle body cleaner in the intake when cranking to see if the engine tries to start and run. If not, then check the compression to see if you have compression. If no compression you'll usually be able to hear this in the starter motor as an engine that spins over faster than usual.

Once you understand which of these basics you have and which you don't have, that will help you greatly reduce the number of systems you need to consider for troubleshooting.

Posted on May 02, 2017

Testimonial: "yes it truly shows nothing I am in a jiff lube bay and its there tester any other ideals on the problem may be please help"

  • Rodney Schmidt
    Rodney Schmidt May 03, 2017

    Well, does the tester connect to your Probe, it just reports no diagnostic codes, or does the tester never even connect? Have you checked for any of the other items mentioned (fuel pressure or spark)? Since it's in a jiff lube bay, I'm assuming it drove there fine so probably not a compression issue unless the timing belt chose that exact time to break.

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Posted on Jan 02, 2017

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