ok i did the AC test where you turn the AC on full blast and the rpm's dip and then go back to around 600...well i did the test today and i failed...can someone tell me what is the part that i would have to check in order to fix this...thanks people...

saber

 

Here is some text copied from the factory service manual.

"Idle Air Control Valve (IACV) -- Auxiliary Air Control (AAC) Valve

This system automatically controls engine idle speed to a specified level.
Idle speed is controlled through fine adjustment of the amount of air which
bypasses the throttle valve via the IACV-AAC valve. The IACV-AAC valve
changes the opening of the air bypass passage to control the amount of
auxiliary air. ... "

You may make a quick test of your IACV-AAC in the following way. With the
motor at normal operating temperature, and at idle, switch the A/C from
"off" to "maximum". Keep your eye on the tachometer as you do this. The
idle speed should dip momentarily and then recover. If it does this, the
IACV-AAC is working. If the idle drops and does not recover, the engine
may stumble, falter, and stall. The IACV-AAC may require cleaning,
adjustment, or replacement.

The correct idle speed is...
- 700 +/- 50 (automatic transmission, in Neutral)
- 625 +/- 50 (5-speed)

Here's the factory service manual component inspection procedure for the IACV-AAC.

1) Make this test with the ignition key OFF. Disconnect the IACV-AAC valve harness connector.

2) Looking into the valve connector with the latch at the top, you will see two rows with three terminal positions in each. They are numbered 1-3 (top row, right to left) and 4-6 (bottom row, right to left). Check resistance between the following terminals.
2 and 1.
2 and 3.
5 and 4.
5 and 6.
At a temperature of 68 F, the reading for all measurements should be approximately 30 ohms.

3) Reconnect the IACV-AAC valve harness connector.

4) Remove the idle air adjusting unit assembly (IACV-AAC valve is built-in) from engine. The IACV-AAC valve harness connector should remain connected.

5) Turn ignition switch ON and OFF, and verify that the IACV-AAC valve shaft smoothly moves forward and backward. If NG, replace the IACV-AAC valve.

 

Are you referring to the famous British luxury car? If so, please spell the name correctly. It is Bentley.

http://www.bentleymotors.co.uk/bentley/index.htm

 

ok well im going to try and test this today...is this going to be something that i can do in my driveway or should i take it to my dealer or mechanic...where is this valve located...is it pictured in the service manual...thank you for your help

saber

 

The Idle Air Control Valve - Auxiliary Air Control valve is fastened to the rear of the upper intake manifold just downstream of the Throttle Body. For further information including photos, please refer to the Chilton repair manual (page 4-15) or the Haynes repair manual (page 6-17).

A closer reading of the manuals indicates that your problem may actually be in a related component. There is a fast idle control solenoid valve for A/C which is adjacent to the IACV-AAC valve. Please see Haynes (page 6-18).

I learn something new every day from browsing the manuals.

 

are these manuals available for viewing on the internet...or is it something that has to be bought...thank you for your help...maybe you should get paid for giving all this advice all the time...

saber

thanks for the spell check as well...

 

does the fact that i have my intake setup affect this at all...thank you again...

 

These books may be purchased at large bookstores (BookStar, Borders, Barnes & Nobles). If not in stock, the bookstore can get it for you in a few days. Repair manuals are also sold by auto parts stores (AutoZone, Pep Boys), and by Web vendors ( www.amazon.com and www.bn.com ). You might find them on the shelf at your public library. IMHO Haynes is better than Chilton, but either will do.