Yesterday driving down the highway my car just shut off (94 Z) so I pulled over to the side and was able to restart and took off again but only after a few minutes of driving it did it again but this time I was not able to restart it. I have a fuel pres. gauge and that was showing normal so I know it wasn't the fuel pump and I just installed a new AC Delco opti in 05' and only have about 40K miles on it so I didn't think it was that. Well I had to have the car towed to a shop and the test reveals that the opti is bad. I know it's mechanical so it's prone to failure but only 40K miles???? What are your thoughts about this???

 

my 97 did the same thing exact thing. I have changed the opti twice. I am not sure what else to do except change the opti electrical plug. any suggestions

 

I've never had an opti go completely out me, changed mine twice over 175k miles, the most recent @ 150k.
Question: now I'm assuming you'd get an SES if the opti wasn't able to read correctly? I would have scanned the sucker before taking it to the shop.

Assuming the opti is to blame (and I keep thinking heat related somewhere if you can drive it for a bit and it dies by the way..) with low mileage like that on a non pos opti (delco)... I'd check the vacuum line that runs into it when you replace it to see if it actually has vacuum :-)

 

I did get a SES light but it took a long time for it to come on and the DTC was # 16. I have a 2 volume GM mannual and it says that most likely you will not get a SES with code 16 and following the mannual it comes down to either a short to ground in the high pulse, short to ground to the low pulse or defective opti