Reply to thread

See what others are reading now! Try Forums > Current Activity

Message: <blockquote data-quote="shiroitenshi" data-source="post: 2525545" data-attributes="member: 27518">It's an Idle Air Control Valve (IACV) It's the black cyclinder thing you see behind the intake manifold, on the driver side. What it does is control your idle depending on engine load.. however, when you have an air leak (of any sort) the idle will start to vary as the IACV copes with the sudden loss of vaccuum pressure, and compensates, then realises it compensated too much, and lets off too much, and the cycle repeats.Your brake runs on vaccuum pressure as well, note the black pipe from your brake servo, and notice where it goes. Obviously playing with the brake pedal will result in irregularities, but in most cases, it's a slight rev drop that's not really apparent unless you're looking for it, since it does run with the aid of a vaccuum source as well. That's why with a dead engine, brakes really don't work very well.A lot of other things run on vaccum as well, and the intake can be said to be the main source of vaccuum. Any of the hoses coming out of this 'source' will result in idle looping, depending on amount, the severity may differ.But overall, if you have significant rev drop when you use the brakes up to the point that even when you depress it when you're in a complete stop, the engine dies, then it is cause for concern to check if the IACV is doing it's job, or if it's working fine, or pinpoint other source of leaks.</blockquote>

Verification

The Marketplace Latest

Mitsubishi lancer Evo x front bumper
- Started by jeff6126
- Exterior and Body
Honda jazz fit gk flrs body kit
- Started by jeff6126
- Exterior and Body
Proton S70 body kit
- Started by jeff6126
- Exterior and Body
Proton saga BLM body kit
- Started by jeff6126
- Exterior and Body
Perodua bezza ~accident repair
- Started by jeff6126
- Exterior and Body
Mercedes Benz W205 C-class GT grille
- Started by jeff6126
- Exterior and Body
BMW E90 ~brake caliper spray ~rim spray
- Started by jeff6126
- Exterior and Body
Honda city gm6 FL front bumper
- Started by jeff6126
- Exterior and Body
original rare spec Rays Volk Racing RE30 15x7jj...
- Started by david tao
- Chassis and Wheels
original rare Rays Volk Racing TE37 SAGA S-Plus...
- Started by david tao
- Chassis and Wheels

Posts refresh every 5 minutes

Repairing haltech sprint 500

hi guys,i need to ask something about my problem. I hope any of you can enlight me with a way to solve this problem.

I bought haltech sprint 500 to fix to my campro engine. The thing is bought on february this year...

I wreck my MR2 :(

IT was Monday night. it was raining, there was a puddle at the bend, and I was trying to avoid something on the road.......

End result, I swerved and hit a lamp post with the back of my car. Still waiting to see how...

A non-mid engine owner's question...

Dear sifoos,

I tot of getting a mr2 but i afraid that it's difficult to find parts for it.
Can i know, is it difficult to buy the engine mounts, absorbers, and all other wear n tear parts?
Pls help sifoos...