I know this might sound crazy, but I'm still fighting this problem on my 92 Camaro 3.1L V6 where it just looses power above ~ 3000 rpm (in nuetral). At this point I have to change something, after troubleshooting damn near everything & completely changing all componets in the distributor. I'm torn between the CAT & the ECM. The reason for my post is that this thing never throws a trouble code. So, as maybe a last step, I'm wondering what senor could I disconnect to see if the ECM is capable of detecting a trouble code. This might sway me away from the CAT. I'm really at my wits end here, but I hate just throwing parts at a car to fix a problem. BTW, the only reason I changed everything in the distributor was a trusted mechanic buddy of mine convinced me that at 110K miles this would be considered maintainence items.

 

When was the last time you changed the fuel pump? That freed up a LOT of power on my car in the upper RPM's.

 

make sure the tune up is good, then i'd check the cat, then fuel preasure

 

Yeah...make sure the tune up is good. This is what I get for letting a teenager take care of a car. I forced a code by disconnecting the MAP. ECM set a trouble code. The night before I read the manual for the GM Tech 1 scan tool. I was reading all my sensor data while in the field service mode, which was a huge mistake, because it causes the CAT to overheat. I realized I needed to use the data list mode. So, I disconneted both battery cables & touched them together to discharge the capacitors in the ECM. I restarted the engine & put the scan tool in the data list mode. Engine still experience the no power problem, but only once. Then I changed the air cleaner & all the spark plugs. Ergo, make sure the tune up is good. I'm still not convinced the problem is solved totally, but there is a dramatic inprovement, meaning the engine will accellerate to any rpm in neutral without dieing out. While driving, the engine will pull to 5000 rpm, with the exception of a hick up early on, after starting the engine. I suspect what is happening is that the ECM is relearning its tables, now that basic engine performance was improved with the new plugs & air cleaner. I'm going to keep road testing to see if the problem totally clears up. I think the ECM has to see a number of start/stop cycles (drive cycles) before it really settles down. I'm still running without the exhaust system until I'm convinced I don't need to change the CAT or the fuel pump. I'm probably really pissing off the neighbors. A V6 w/o a muffler sounds like a sick ***** burner.

 

I'd like to give you my code 32