IMHO If it is not the opti and that is most likely what it is with all the changes you have made...perhaps, since performance degrades when it warms up -there is a slight chance that it is the engine temp sensor. This repair is a lot quicker, easier and cheaper than replacing the opti. This sensor corrects to the ECM and can affect performance since that feedback is used by the ECM to decide fuel/AIR Mix, idle, other ratios... drivability and performance will be effected.

 

generally an ect will usually only cause an issue with cold temps.

 

Wait, Dangalla, a ect? what? I have been trying to diagnose a problem on my car forever because it runs rough only in cold weather. Anyway, just for clarification.

 

Engine coolant sensor, found in the waterpump.

 

The ECT can affect a cold engine (doesn't tell the PCM the engine is cold), or a hot engine (doesn't tell the PCM the engine is hot).

You will only get a code if the sensor circuit is totally "open" (infinite resistance) or "shorted" (zero resistance).

It pays to look at what the PCM is reading from the sensor, using a scanner.

 

just replaced the opti the other day and all symptoms are gone as well. the nightmare is finally over lol

 

Man, I wonder what's going on with the PartysLady on Ebay(now out of business).... I've purchased from her many times over the years, but she now seems to be screwing over A LOT (hundreds) of customers as you can see from here pages and pages of horrible feedback... and some friends of mine who placed orders from her recently, got nothing... Link>>>>>>>>>http://feedback.ebay.com/ws/eBayISAP...k&myworld=true Link>>>>>>>> http://myworld.ebay.com/thepartsladi/

 

This has been discussed in several threads over the past two weeks. Latest one:

https://www.camaroz28.com/forums/sho...d.php?t=754411

 

i had the same code and it was opti. once u take it out u will see that the bearing in the opti is probly blown up

 

I see......

 

I haven't taken the old opti apart yet but just by turning it I could tell something was terribly wrong, i don't know how the car was even running with that thing on there. BTW, I ordered my opti off amazon for 299 free shipping and it's ac delco. So if anyone is looking for one check there.

 

Woot, nice find. Thanks!

 

Open it up and see what failed.

 

I had the exact same issue with my 94 formula when i bought it ran great in a test drive, then drove it home and started stumbling and running like crap. turned out to be the opti.