High Cold Idle
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BonneBill
- SLE Member
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- Year and Trim: 98 Bonneville SE - 106K
07 Lucerne CX - only 25K
High Cold Idle
2000 Bonneville SE, 3800 naturally aspirated. When cold started, idle will range from 1500 to 2000 RPM. When it worked correctly, the idle would start to drop down to 800 after 30 seconds or so. Now it stays at 1500 to 2000 for several minutes. I cleaned the TB and replaced the IAC, but still does the same thing. No codes thrown. No vacuum leaks evident. Am I looking at a computer reflash? Something I've missed? Once it warms up, idle is 800 like normal. Subsequent hot starts have no issue either.
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bonnevillain
- Retired Site Developer
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Re: High Cold Idle
It's pretty normal for cold weather.
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BonneBill
- SLE Member
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- Year and Trim: 98 Bonneville SE - 106K
07 Lucerne CX - only 25K
Re: High Cold Idle
It does it in warm weather as well. Before malfunctioning, it only held high idle in cold weather for a minute or less, then started dropping. Now it doesn't.
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2000Silverbullet
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Re: High Cold Idle
You should hear all the hissing and idle revving up here in Cold country!Sounds normal.
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Archon
- Resident Gearhead
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Re: High Cold Idle
What method did you use to check for the vacuum leaks? Did you spray intake cleaner around all vacuum hoses and fittings? Did you include the EGR tubes?
Most things that would cause a high idle would also show up at times other than just when cold. Some other things to check are: the throttle position sensor, coolant temperature sensor, and the PCV valve.
Are you experiencing any other problems?
Most things that would cause a high idle would also show up at times other than just when cold. Some other things to check are: the throttle position sensor, coolant temperature sensor, and the PCV valve.
Are you experiencing any other problems?
*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.
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harofreak00
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Re: High Cold Idle
I lost a post here from the data transfer.
You are probable experiencing the high idle from the Secondary Air Injection Pump. It creates a higher idle when it is on, which is about 30 seconds from the time you start the car. Its completely normal.
viewtopic.php?f=18&t=3081
You are probable experiencing the high idle from the Secondary Air Injection Pump. It creates a higher idle when it is on, which is about 30 seconds from the time you start the car. Its completely normal.
viewtopic.php?f=18&t=3081
Andrew - owner/operator of Bonnevilles Unlimited
2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
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2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 57k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
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RJGill84
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Re: High Cold Idle
I have high idle for several minutes as well, unless I rev the car a bit...then it settles. Typically it will start lowering the idle shortly after the rear suspension pump goes off.
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BonneBill
- SLE Member
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- Year and Trim: 98 Bonneville SE - 106K
07 Lucerne CX - only 25K
Re: High Cold Idle
But I'm getting high idle for more than the usual 30 sec. My 98 acts normally and my 2000 did until the last month. I'm still wondering if there's a software glitch that needs a reflash.
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DASHAWN1234
- SLE Member
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Re: High Cold Idle
My car is doing the samething but only after I cleaned the TB and accidentally removed 
the TPS anyone know how to set the TPS?
the TPS anyone know how to set the TPS?