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Thread: warm idle issue
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09-15-2007, 04:07 PM #1
- Join Date
- Feb 2006
- Location
- GARDEN GROVE, CA
- Age
- 50
- Posts
- 95
BLACK- 2002, CAMARO Z28
warm idle issue
Once the car gets into closed loop the idle gets rough. Also when I come to a stoplight the car will start to idle slightly low for maybe 5secs then rev back up to normal. In this low idle state the 02 sensors reading all drop to single digits. I have 0 codes and so far have tried another maf, vacuum leak lests, new coolant temp sensor and still have the issue. I'm thinking a slow 02 sensor but I don't think all the 02 readings would drop at the same time. I read live data with just predator. I have tested the throttle position sensor and it checked out fine. Maybe the 160 thermostat or the iat possible? Help me please.
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09-15-2007, 04:36 PM #2
Either the IAC or IAT sensor would be my guess
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09-15-2007, 05:05 PM #3
- Join Date
- Feb 2006
- Location
- GARDEN GROVE, CA
- Age
- 50
- Posts
- 95
BLACK- 2002, CAMARO Z28
I've tried another iat sensor that I have on a stock lid and no difference. I have cleaned the iac many times with throttlebody cleaner to clean the carbon buildup. Is there a way to test it, the iac?
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09-15-2007, 10:10 PM #4
what do your fuel trims look like? What % are they? Any work on the car lately up around the intake area?
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09-16-2007, 07:06 AM #5
- Join Date
- Feb 2006
- Location
- GARDEN GROVE, CA
- Age
- 50
- Posts
- 95
BLACK- 2002, CAMARO Z28
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09-18-2007, 06:04 PM #6
what mods done to the motor? stock cam? stock heads?
this is just a guess:
sounds like Deceleration Fuel Cut Off is staying on too long. also, in looking at the DFCO table, if the TPS reads under 1% at 800 rpms, it keeps the injectors shut off. then, once the engine hits the 400 rpms, it'll shut off the DFCO.
unfortunately, you cannot make any changes to the DFCO tables with the predator.
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09-18-2007, 11:24 PM #7
also just out of curiosity have you tried removing the predator tune and running your stock tune to see if it still does it?
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09-19-2007, 05:27 AM #8
just remembered another reason for this. the rich/lean switch points might be causing this issue as well. look in the mrr23, hptuners part 2 thread for that explanation. again, with the predator, you can't change those points though.
Cold Air Intake, Muffler Delete, Vinci High Performance Dual Valve Springs, Hardened Pushrods, Yella Terra 1.85 Rockers, Some Hydropdipped Stuff, Strut Tower Brace, Some SS Badges, boost/vacuum gauge, fuel pressure gauge, some checkered stripes, drilled/slotted rotors, ZL1addons Stealth wickerbill, Ruxifey LED side markers
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09-19-2007, 06:33 AM #9
- Join Date
- Feb 2006
- Location
- GARDEN GROVE, CA
- Age
- 50
- Posts
- 95
BLACK- 2002, CAMARO Z28
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09-19-2007, 06:12 PM #10
what should you idle at? I idle around 5-800 rpm? 500/600 in P 7/800 in N
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09-19-2007, 08:05 PM #11
no reason to live with this. There's a reason somewhere. List all of your mods for us to give an idea of how modded the car is. Sounds like issues a cammed car would have. Usually an airflow issue.
edit
I just looked at your profile, are those mods current? Are you still running the maft?
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09-21-2007, 06:37 PM #12
- Join Date
- Feb 2006
- Location
- GARDEN GROVE, CA
- Age
- 50
- Posts
- 95
BLACK- 2002, CAMARO Z28
Mods are just a lid. maft, and powerstick muffler in the midpipe. I have tried disconnecting the maft and it still does it.
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09-22-2007, 01:47 AM #13
If you're running the predator I would take the maft off and leave it off. No reason for it since you have a predator. After you tried it without the maft did you give it a little drive time to let the car relearn trims? ~50minutes.
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