codes and idling high

[henry tanner]

the gas cap light and code showed up again. i cleared it and the truck has been idling high when i start it up. any ideas?

thanks

hdt

 

[Todd Z]

What are the exact codes you get ?



todd Z

 

[EddieS'04]

idling high when i start it up

Mine also. But it always has in cooler weather, few 100 more rpm. Mine drops back to 1k rpm, in about the same time as warm weather. About 15 seconds. Within a minute 800 rpm.

 

[henry tanner]

mine starts when i carck it up goes up to 2,000 rpm. then settles down to 1,500 rpms.

the code i will look and post it. i have it wrote donw in the truck. the gas cap has been replaced five times. the erg, pvc and the erg regular has been replace. the air contol vvale has been clenaed. both evap canters have been replaced. someone sadi it may be a line or a vvale near the gas cap.

thanks

hdt

 

[EddieS'04]

gas cap has been replaced five times

I would check all hose to the canistors. Some of the hoses do not have clamps. You may need to cut the ends. They may not be sealing good. Might have some vacuum leaks.



In this cold weather mine cranks to 1800rpm. Drops imediatly to 1500. 1000 in 15seconds. Then within a minute to 800 to 850. I have my sct xcal3 set to 850 idle.

In warm weather my crank rpm is 1400 to 1500rpm.

the air contol vvale has been clenaed

If you have many miles on it. Might try replacing it.

 

[henry tanner]

only have 82,500 miles on her.

 

[EddieS'04]

only have 82,500 miles on her.

My moms' grand marquis @ 100K. Kept idling high. Even after 2 cleanings of the IAC and TB. Checked all hoses and connections.

I would drive it 22 miles to walmart. When I put it in park, the rpms were racing. I even pulled the neg batt cable. To let it relearn idle. It was short lived.

I finnaly replaced the IAC. Solved the problem. It was either sticking or the seat was worn.

You might consider replacing the IAC @ your 83K miles.

 

[henry tanner]

now it is ildeing at 2000 rpms the low is 1500 rpms.

 

[EddieS'04]

Have you checked the TB blade. See if some build up is holding it open.



Did you get the codes read.?

 

[henry tanner]

po457 is the code. i will check the tb and clean it along with the iac.

thanks

hdt

 

[scott degroot]

The P0457 is definetely an evap leak code. Now that along with your high idle condition would have me looking at the vapor management vlave that is located in the left front of the engine compartment. See if the vacuum line from the intake to the manifold is broken or if the valve itself is intact. A vacuum issue here could definetely be causing both of your issues.

 

[henry tanner]

pic please.

 

[EddieS'04]

First picis the valve, behind the green cap.

Second is where the tubing (middle rubber one) connects to the intake.

[Broken External Image]:

[Broken External Image]:

 

[henry tanner]

thanks to all i will try the ideas this weekend.

hdt

 

[henry tanner]

i cleaned the troddle boby, cleaned the iac, and the air intake senor. than reset the batt. she is running good now knock on wood. she stays that way.

thanks

hdt.