well last night my PCV valve that hooks up with oil filler neck pumped out of place. I think a silicone line failed, but anyways i fixed it with new vacuum lines and now my idle is normal but sometimes when i go to brake it hunts up a down a bit. This is a weekend car so its not a problem but you guys have any suggustions what it can be. Thanks! Ps can i elimante this valve and I also checked all lines.

 

No help anyone?

 

I have the same problem... seems to happen to me more at night when I have the headlights on. It's almost like there isn't enough power to run all of the accessories so it makes the engine bog down. But like he said; anyone have any ideas?

 

I have the same problem, Im pretty sure its electrical because before i switched to my mini battery i had no problems.

 

Yea ok i have a big stereo hooked up so I think thats it. Thanks guys for your suggustions, what sorta gets me is this started happening after that incident.

 

I also have the small battery (located in the bin behind the passenger seat) but what confuses me about it is that once the car is running, the alternator should be doing the work, not the battery. A small battery shouldn't make a difference, atleast you wouldn't think?

 

our alternator isnt the most powerful

 

What is happening is your voltage is low with the lights on, fans running, stereo, etc. The low voltage makes the fuel injector drivers duty the injectors at a lower rate than the ECU is mapped, thus creating a leaner idle. Lean idles on our cars like to hunt. Sounds like your electrical load unit is not working because it should step the idle up to help compensate.

If you have a smaller crank pulley and a larger pulley on the altenator, it will not spin fast enough to keep the voltage at 14.5. The ECU is designed for a contant voltage.

 

yea thanks for explanation, It does it for like 3 seconds than idles a little higher than normal. So this expains it. Thanks

 

hey thanks guys for all ur help but i guess i didnt look good enough cause one vaccuum tube was cappped off next to the one by pcv valve and when i looked it wasnt. I plug it and it fixed the problem.