OBD1 scopes

Guys,

I work on mostly OBD2 type vehicles but I am starting to get more and more OBD1 cars. I have a Verus Pro scope. My question is.. is it worth the money to buy adapters for my scope to look at OBD1 vehicles or should I continue to count the blinks of the Service Engine Soon lights? I also am wondering can you look at fuel trims on fuel injected OBD1 vehicles?
Thanks for your input

Yes. Get the OBD I adapter. There is not near as much info/capabilities as OBD II, but you CAN read some engine data pids.

I would really think hard if tooling up for OBD1 is worth it, these vehicles are already at 20 years old and the numbers on the road will pretty soon fall off the cliff and those that do remain will be in the hands of guys who have their own scantools.

If you do tool up for OBD1 then I would look for secondhand scan tools rather than buy adaptors.

Dave101 wrote: but I am starting to get more and more OBD1 cars

Clearly, you still have a need for OBD-I. I do, as well. Adapters sell for less than $20, each, on Ebay....A whole set for $150.

Clearly, you still have a need for OBD-I. I do, as well. Adapters sell for less than $20, each, on Ebay....A whole set for $150.[/quote]

I am looking for attachments that fit my scope, but I am wondering what data pids can you see? And is it worth it?

The pids you get vary. It was up to the Manufacture's discretion.

My personal truck happens to be OBD-1. (1991 Chevy K2500) I'll connect it, tomorrow, and post a screenshot.

You asked, specifically, about fuel trim. Block Learn and Integrator are your LTFT and STFT. 128 being Zero. Anything above is positive. Anything below is negative.

GM was fantastic about providing data even in the OBD1 days. Always appreciated that.

Dunno how many OBD1 Fords you see, but those adapters are absolutely worth having. Many applications provide data, and even if they don't, being able to do the KOEO Self-Test and KOER Self-Test is worth it all on its own.