Cold Idle Issue

[rcharris]

Cold Start Idle Issue

I did some hunting around on this forum and couldn't seem to find anything that quite fit my situation. My GF has a 1999 3.4 4Runner that has recently started having some idle issues. On cold start her truck will idle very rough for a few seconds but goes away very shortly. It will occur in park or in gear. Lately it happens every third day or so: it's not consistent. Her truck has around 135K with about 20K on a Toyota installed long block. It hasn't seen any recent changes.

I'm going to start with the basics and check fuel/spark/air. Reading on the forum it doesn't sound like a MAF issue as the problem isn't happening all the time. Any thoughts?

 

[JeremyH]

Does the 3.4L have an Idle Air Control Valve? If so, then it sounds like you need to pull it and clean the plunger. They can get a heavy carbon buildup and cause the plunger to stick...

 

[GottaBeTRD]

mine does this exact same thing! did you ever get it fixed by cleaning the idle control?

 

[shawnstcyr]

Mine started doing that a few weeks before the TPS went bad. Relpaced it and it has never been back. I would meter out that Coolant Temperature Sensor as well. That sensor takes the place of a choke on the old carberated engines. It tells the ECU how much fuel to deliver at various engine temps.