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September 3rd, 2002, 04:25 PM
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1500 rpm fast idle IAC drops to Zero, TPS is at .42 cannot lower idle?? HELP!!!
Ok, car ran great, installed the intake plate and then the high idle problem occured, removed plate and the same problem, checked all gaskets and cannot find any vaccumm leak anywhere on the vehicle. When the engine warms up it will idle up to 1500rpm, and the iac drops to zero and I checked and it is fully closed. adjusted the air bleed srew all the way and the iac remains at zero. This would tell me that there is a vaccumm leak, but I have checked 5 times. Fuel trims seem to remain pretty close to 128, iac has been replaced. Any help would be great... Thanks
    
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September 4th, 2002, 01:34 PM
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It has to be sucking air some where around the top intake.Check all the lines and can you here it sucking air?
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1987 GN T-Top Best ET/MPH 11.96 113.70 1983 Pro Street S-10 2002 Corvette Coupe 2009 Pontiac G8 GT
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September 5th, 2002, 09:44 AM
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There is no sucking noise that can be heard, I sprayed everything with starting fliud, no idle change. One other strange thing is when I jump the ALDL connector, I am assuning this fully closes the iac, I can set the base idle at 550-650 rpm... Thanks
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September 8th, 2002, 01:46 AM
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Does your scantool see the ECM in the ALDL mode or is it in normal mode? In the diagnostic mode the idle is turned up by the ECM. Maybe somehow your ECM might be in the diagnostic mode?
__________________
87 GN, Kenne-Bell SS dual 2.5" exhaust, THDP w/dump, race Hemco with 62MM TB, AFPR, MaxEffort 8 position chip, ATR ram air kit, stock turbo, injectors & IC. 87 GN SS 2.5" exhaust, THDP, PP, vacuum brakes and ATR chip. Soon to be daily driver. Still sitting in the closet: Knock Detector Alarm, new Autometer Boost and Fuel Pressure Gauge and MSD ignition, TE-44, CAS V4, Razor's PAC Alky Kit, Tom Grant rear LC arm, HRPartsN stuff rear sway bar kit, Walbro 340 and hot wire kit, Hemco 70MM TB, Poly motor mounts, C-Clip eliminator w/ axles and lifetime car cover from Car Motorsports. The Way to salvation: Romans 10:9 - 13
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September 12th, 2002, 12:40 PM
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I use Turbo Link and sometimes the ECM somehow goes into ALDL mode instead of NORMAL. When this happens I notice the idle speed increases up to 1000+ RPMs. According to the T-Link manual it states, "The Assembly Line Diagnostic Link (ALDL) mode allows you to read different data from the ECM. This mode is sometimes referred to as the "Special State" or the "10K Ohm State" in some repair manuals. Fuel injected GM vehicles automatically raise the idle speed to 1000 RPM and add extra spark advance to the spark calculations when in the mode. The ALDL mode feature is primarily used to check the operation of the Electronic Spark Control (ESC)."
Just thought this might be your case as I have experienced this on my car.
__________________
87 GN, Kenne-Bell SS dual 2.5" exhaust, THDP w/dump, race Hemco with 62MM TB, AFPR, MaxEffort 8 position chip, ATR ram air kit, stock turbo, injectors & IC. 87 GN SS 2.5" exhaust, THDP, PP, vacuum brakes and ATR chip. Soon to be daily driver. Still sitting in the closet: Knock Detector Alarm, new Autometer Boost and Fuel Pressure Gauge and MSD ignition, TE-44, CAS V4, Razor's PAC Alky Kit, Tom Grant rear LC arm, HRPartsN stuff rear sway bar kit, Walbro 340 and hot wire kit, Hemco 70MM TB, Poly motor mounts, C-Clip eliminator w/ axles and lifetime car cover from Car Motorsports. The Way to salvation: Romans 10:9 - 13
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