Need help please

[Tony Almaraz]

1995 z71. It doesn’t happen every time I drive it but sometimes when I’m driving for about 15-20 minutes my service engine light comes on but will come off when I turn it off. Like I said sometimes it happens sometimes it doesn’t... any ideas???

 

[alpinecrick]

1995 z71. It doesn’t happen every time I drive it but sometimes when I’m driving for about 15-20 minutes my service engine light comes on but will come off when I turn it off. Like I said sometimes it happens sometimes it doesn’t... any ideas???

I've had O2 sensors do that. Either buy a scanner or the next time the SEL comes on wheel into the auto parts store and have them read the code (provided they will read it out of fear of the Wuhan Virus), around here they currently won't read them for customers.

 

[PlayingWithTBI]

Try the paperclip trick. TBIs will set an SES and then the light will go out but the PCM will store the code for somewhere around 30 - 40 key cycles. If I had to venture a wild guess, I'd say code 32 - EGR. It'll set once your engine is warmed up and you're cruising at or above 45MPH if it has an issue.

 

[thinger2]

A 95 is still OBD 1 so you don't need a scanner.
Watch a YouTube video on how to retrieve OBD1 codes it's easy to do.

 

[alpinecrick]

Oh crap I didn't read close enough, didn't realize it was a TBI.......

 

[Schurkey]

Still need a REAL scan tool to view the data stream--which is generally more important than reading "codes".

 

[Supercharged111]

Still need a REAL scan tool to view the data stream--which is generally more important than reading "codes".

How easy is an OBDI scanner to come by these days?

 

[PlayingWithTBI]

How easy is an OBDI scanner to come by these days?

Here's some - not cheap. I've seen some at Oreilly's too, IIRC.

https://www.amazon.com/OTC-3211-Sca...hvlocphy=&hvtargid=pla-4584070138255907&psc=1

You can also use TunerPro RT on your laptop with an ALDL (12 pin) to USB cable - cheap, only ~$60 total investment. All you need is the correct definition file for your ECM/PCM from TP website or Gearhead-EFI's site.

 

[Schurkey]

How easy is an OBDI scanner to come by these days?

Any decent scan tool will work on computer-controlled vehicle from 80 1/2 to OBD II.

Consumer-grade cheap-junk will have a later cut-off, perhaps 1984-newer.

 

[98 Nitro]

My 94 use to do the same thing, when warmed up and at highway speeds it would set the SEL. It was the O2 sensor.