pulling up to a stop light idles at 700. Then dies

[carmelo2215]

1997 Ford 4.6L Expo. Driving down the road no missing seems to have good power. Coming to a stop light idles at 700RPM. Then stop, idles is ok. After stopped minute, just dies like I turned the Expo off. Starts back up normal drive away. It does not always happen at a long light. When at a short light or at a stop sign Expo is ok.

 

[rex450se]

I'd start with the Idle Air Control valve. It's like $50 and 5 minutes. Easy and fairly cheap to replace. My wife's '98 had a similar issue and replacing the IAC fixed it.

Victor

 

[BigJuicy02]

Give it the sea foam treatment and its probably worth it to change the fuel filter as well. Sounds like minor maintenance issues. +1 on the IAC as well.

 

[carmelo2215]

I have changed the fuel filter to address this problem. Sea Foam the oil and gas? I gotta new IAC coming, be in tomorrow. Thanks.

 

[BANGEREXPO76]

Also check your hoses for leaks.

 

[Jeff532003]

I have changed the fuel filter to address this problem. Sea Foam the oil and gas? I gotta new IAC coming, be in tomorrow. Thanks.

I wouldn't put seafoam in the crank case unless you planned on running it 10-20 min and changing the oil but even then I'd worry about sludge settling in the pan which could eventually cause an oil pump clog. I always recommend staying away from oil additives with the exception being Mystery Oil.
As far as where to use the seafoam I'd dump a can in about a half a tank of gas and run it down to empty. This will clean up the injectors nicely. Also pull off your break booster vacuum line and SLOWLY let it suck in about a third of a can. It's going to run rough while your doing this as there will be a massive vacuum leak. After it gets a third of a can in kill the ignition and let it sit for 10-15 min. Put the vacuum line back on the booster and fire it up. You may have to give it gas and it may initially start hard depending how dirty your top end is. It may also smoke like a son of a gun if there's a lot of carbon burning off. I actually had a fireman stop thinking my buddies Toyota truck was on fire it smoked so bad. My Expy on the other hand wasn't bad at all but the PO had serviced it to the letter so it's pretty clean.
You also may want to pull your throttle body off and check the egr ports but if it normally idles fine then I'd guess they should be clear but you never know.

 

[superexpy]

Take off the IAC and clean it. Everytime I see these fail it just needs a good cleaning

 

[ArtGamer60]

If you decide to use Seafoam , you should change your oil immediately IMO - if used in the crankcase . I have heard alot of good things about this product , I have also read about it fouling spark plugs in rare instances , not sure if they used it correctly ?

Using Seafoam

:Seafoam Motor Treatment and Introducing NEW Seafoam Spray - YouTube