Bad or Dirty Air Bypass Valve???

mimicons · 11-10-2002, 10:28 AM

My car runs fine on the road, but after a while of driving at consistant speeds (highway), when I pull off at a light or whatever, the engine is revving at 1500-1750 rpm. If I shut the engine off, the idle goes back to normal.

Is this the IAB valve, and if so, should I clean it out? Any help will be appreciated. Has anyone else had this problem?

Mike

PKRWUD · 11-10-2002, 10:56 AM

A more common result of a faulty IAB valve is a poor idle when cold, however, if the valve were to stick open, it would result in a high idle when warm. That being said, and the fact that it never hurts to do it anyway, you now have valid reasons to clean yours. Get some wire pipe cleaners and a can of CRC Brakleen (green can), and go to town. Make sure you reset the ECM after you're finished.

Take care,
~Chris

Agent_4573 · 11-10-2002, 02:23 PM

PKRWUD: I'm probably goign to give mine a good cleaning when swapping out intakes... would a can of "gumout" do the same thing as crc brakleen? I only ask cuz im broke and konw that i have a can of gumout at home.

PKRWUD · 11-10-2002, 08:02 PM

It's better than nothing, but Brakleen (in the green can) is the best schit there is. It will even peel paint for you.

Take care,
~Chris

11-10-2002, 10:28 AM	#1
mimicons Registered Member Join Date: Aug 2001 Location: Atlanta Area, USA Posts: 42	Bad or Dirty Air Bypass Valve??? My car runs fine on the road, but after a while of driving at consistant speeds (highway), when I pull off at a light or whatever, the engine is revving at 1500-1750 rpm. If I shut the engine off, the idle goes back to normal. Is this the IAB valve, and if so, should I clean it out? Any help will be appreciated. Has anyone else had this problem? Mike

11-10-2002, 10:56 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	A more common result of a faulty IAB valve is a poor idle when cold, however, if the valve were to stick open, it would result in a high idle when warm. That being said, and the fact that it never hurts to do it anyway, you now have valid reasons to clean yours. Get some wire pipe cleaners and a can of CRC Brakleen (green can), and go to town. Make sure you reset the ECM after you're finished. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-10-2002, 02:23 PM	#3
Agent_4573 Registered Member Join Date: May 2002 Location: New Jersey Posts: 375	PKRWUD: I'm probably goign to give mine a good cleaning when swapping out intakes... would a can of "gumout" do the same thing as crc brakleen? I only ask cuz im broke and konw that i have a can of gumout at home. __________________ '89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com

11-10-2002, 08:02 PM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	It's better than nothing, but Brakleen (in the green can) is the best schit there is. It will even peel paint for you. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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