2004 Trailblazer 6 cyl. idles too low and sometimes will kill but runs great. A scan code of P0606 comes up which relates to the pcm but this has been going on for over a year and it helps idle better after pouring an injector/fuel additive in the tank. I can't justify replacing the pcm and not solving the problem.

Marvin

• 85242 Answers
• Posted on Feb 12, 2009

SOURCE: 1999 Chevrolet Tracker low idle problem when cold

Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

SOURCE: 97 chevy pu 305 vortec, had cyl 6 misfire and

thats usually a sign of a vacuum leak, recheck and make sure you don't have any loose hoses, or cut intake seals

SOURCE: Oil in spark plugs

Could mean a variety of things.....
Possible head gasket leak....(cheap fix if caught early)
Possible Worn piston rings
possible valve guide oil seals

SOURCE: idle problem on a 2006 chevy trailblazer 4.2

The code indicates an issue with the Throttle Actuator control. This is a little motor on the throttle body that opens the throttle plates at idle. That control motor may be bad and thus, causing a low idle.

I hope this helps.

Mike Butler

• 6674 Answers
• Posted on Aug 30, 2009

SOURCE: low idle code PO506

The dealer is looking for an easy way out, even though it may not be a big problem. They have the proper tools & equipment to diagnose it properly (or at least they should have) and repair it properly. I would insist on getting it taken care of , otherwise head for another dealer, have it repaired & send them the bill.