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Blaze69 · 11-14-2008, 08:47 PM

I thought that the PCM when into a open mode (but still monitors all the sensors) when the engine was cold and then once it reached a certain temp it would go into the closed mode and actually start controlling and making adjustments. One other thing about this is where is the actual sensor located? I read somewhere that it was on the drivers side near the radiator.
What about the IAC motor? Could it have an effect on this? Does the computer use this in a open mode?

As for the plugs, there was no reason for me to change them originally, I just did to try something new (the bosch platinum 4). I ended up going back to the original because I really saw no improvement. Isn't the factory plug an Iridium based plug?

11-14-2008, 08:47 PM	#6
Blaze69 Registered User Join Date: Apr 2001 Location: Arizona Posts: 147	Re: Possible intake gasket leak I thought that the PCM when into a open mode (but still monitors all the sensors) when the engine was cold and then once it reached a certain temp it would go into the closed mode and actually start controlling and making adjustments. One other thing about this is where is the actual sensor located? I read somewhere that it was on the drivers side near the radiator. What about the IAC motor? Could it have an effect on this? Does the computer use this in a open mode? As for the plugs, there was no reason for me to change them originally, I just did to try something new (the bosch platinum 4). I ended up going back to the original because I really saw no improvement. Isn't the factory plug an Iridium based plug? __________________ 1969 Blazer: 350/350, 4X4, HEI, Edlebrock carb/intake, dual flowmasters, np205, 3:07's and the rest is mostly stock. The front end disc swap is finally complete 2002 Z71 Tahoe. CAI, Flowmaster 40, Silverstars in high, low and fogs and a bunch of mods (upgrades) inside and out.