Hunting for idle Grrrrrrrrrrr
08-21-2007 | 03:06 PM
#32
Thread Starter
Race Car
Joined: Aug 2005
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From: Terrorizing your neighbourhood!
08-22-2007 | 01:38 AM
#34
Burning Brakes
Joined: Sep 2002
Posts: 814
Likes: 3
From: Southern California
Um, I think it's time to get a new mechanic. 
The mixture can be adjusted (see the 6th post in this thread from Peter Zimmerman, who likely has forgotten more about the 911 than any of us will ever have known in the first place), and your mechanic should know this. Find a qualified mechanic who knows your car's engine, and ask him to check and adjust your mixture. My strong hunch is that your problem will be solved.
The mixture can be adjusted (see the 6th post in this thread from Peter Zimmerman, who likely has forgotten more about the 911 than any of us will ever have known in the first place), and your mechanic should know this. Find a qualified mechanic who knows your car's engine, and ask him to check and adjust your mixture. My strong hunch is that your problem will be solved.
08-22-2007 | 10:16 AM
#35
Thread Starter
Race Car
Joined: Aug 2005
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From: Terrorizing your neighbourhood!
Um, I think it's time to get a new mechanic.
The mixture can be adjusted (see the 6th post in this thread from Peter Zimmerman, who likely has forgotten more about the 911 than any of us will ever have known in the first place), and your mechanic should know this. Find a qualified mechanic who knows your car's engine, and ask him to check and adjust your mixture. My strong hunch is that your problem will be solved.
The mixture can be adjusted (see the 6th post in this thread from Peter Zimmerman, who likely has forgotten more about the 911 than any of us will ever have known in the first place), and your mechanic should know this. Find a qualified mechanic who knows your car's engine, and ask him to check and adjust your mixture. My strong hunch is that your problem will be solved.
I have a lot of respect for this guy and it's more of a favor helping me than anything else.
08-22-2007 | 02:43 PM
#36
Burning Brakes
Joined: Sep 2002
Posts: 814
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From: Southern California
09-11-2007 | 05:44 PM
#37
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Race Car
Joined: Aug 2005
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From: Terrorizing your neighbourhood!
Update.
As I was about to do a few tests on sensors etc., the problem has gone away.
Pretty hard testing a circut when it's running fine.
I'm sure I'll be back to Grrrrrrrrr at some point though.
Rod
BTW Even if it was doing it I don't feel adjusting the richness is the way to go.
As this is intermittent, leaning it out would make it to lean when the problem isn't happening.
Band-aid solution.
As I was about to do a few tests on sensors etc., the problem has gone away.
Pretty hard testing a circut when it's running fine.
I'm sure I'll be back to Grrrrrrrrr at some point though.
Rod
BTW Even if it was doing it I don't feel adjusting the richness is the way to go.
As this is intermittent, leaning it out would make it to lean when the problem isn't happening.
Band-aid solution.
09-11-2007 | 07:28 PM
#38
Burning Brakes
Joined: Sep 2002
Posts: 814
Likes: 3
From: Southern California
Has the weather changed is your area? Hotter/colder? More/less moisture in the air? All of those variables will impact mixture. Do you have a sense of the conditions under which the problem manifests itself?
09-12-2007 | 03:33 AM
#39
Cruisin'
Joined: Jul 2006
Posts: 9
Likes: 0
I experienced the same hunting issues:
As Peter Z and others have stated... it sounds like your AFR needs to be adjusted properly. And scottb is correct in that the outside temp will impact the mixture. In my case, the colder it was outside the harder it hunted. I had a shop adjust the AFM to the correct CO specs and no more embarrassing hunting idle.
Also since you might have a performance chip, make sure the brown wire going to the DME is unplugged. This wire is only used to help pass Cali emissions, but is known to cause a hunting idle with performance chips. Check out Steve Wong's website (911 Chips) for pics and information on the brown wire. BTW I think you can get a stock chip from him for about $35... not exactly sure on price.
Good luck and post your progress. In case these suggestions don't solve your issue, trying searching on Pelican's forum as this seems to be common problem that is posted there frequently.
As Peter Z and others have stated... it sounds like your AFR needs to be adjusted properly. And scottb is correct in that the outside temp will impact the mixture. In my case, the colder it was outside the harder it hunted. I had a shop adjust the AFM to the correct CO specs and no more embarrassing hunting idle.
Also since you might have a performance chip, make sure the brown wire going to the DME is unplugged. This wire is only used to help pass Cali emissions, but is known to cause a hunting idle with performance chips. Check out Steve Wong's website (911 Chips) for pics and information on the brown wire. BTW I think you can get a stock chip from him for about $35... not exactly sure on price.
Good luck and post your progress. In case these suggestions don't solve your issue, trying searching on Pelican's forum as this seems to be common problem that is posted there frequently.
09-12-2007 | 12:13 PM
#40
Thread Starter
Race Car
Joined: Aug 2005
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From: Terrorizing your neighbourhood!
It ran fine in the cold morning but hunted in the heat/humidity of the day.
Now it runs fine under all conditions.
I experienced the same hunting issues:
As Peter Z and others have stated... it sounds like your AFR needs to be adjusted properly. And scottb is correct in that the outside temp will impact the mixture. In my case, the colder it was outside the harder it hunted. I had a shop adjust the AFM to the correct CO specs and no more embarrassing hunting idle.
Making the adjustment maybe if it did this all of the time, but I don't want to lean it out when it's fine sometimes.
Also since you might have a performance chip, make sure the brown wire going to the DME is unplugged. This wire is only used to help pass Cali emissions, but is known to cause a hunting idle with performance chips. Check out Steve Wong's website (911 Chips) for pics and information on the brown wire. BTW I think you can get a stock chip from him for about $35... not exactly sure on price.
Brown wire? On the harness?
I have an aftermarket chip, and have thought about humidity effecting it.
I also have a factory chip and DME that I will try.
Good luck and post your progress. In case these suggestions don't solve your issue, trying searching on Pelican's forum as this seems to be common problem that is posted there frequently.
As Peter Z and others have stated... it sounds like your AFR needs to be adjusted properly. And scottb is correct in that the outside temp will impact the mixture. In my case, the colder it was outside the harder it hunted. I had a shop adjust the AFM to the correct CO specs and no more embarrassing hunting idle.
Making the adjustment maybe if it did this all of the time, but I don't want to lean it out when it's fine sometimes.
Also since you might have a performance chip, make sure the brown wire going to the DME is unplugged. This wire is only used to help pass Cali emissions, but is known to cause a hunting idle with performance chips. Check out Steve Wong's website (911 Chips) for pics and information on the brown wire. BTW I think you can get a stock chip from him for about $35... not exactly sure on price.
Brown wire? On the harness?
I have an aftermarket chip, and have thought about humidity effecting it.
I also have a factory chip and DME that I will try.
Good luck and post your progress. In case these suggestions don't solve your issue, trying searching on Pelican's forum as this seems to be common problem that is posted there frequently.
If this was a woman she'd be long gone
09-12-2007 | 03:34 PM
#41
Burning Brakes
Joined: Sep 2002
Posts: 814
Likes: 3
From: Southern California
Running fine in cool weather and having idle problems in warm/humid weather is a classic symptom of a mixture problem. As the weather heats up and gets humid, there is less oxygen and more moisture per cubic foot of air. If your mixture is just on the edge of being OK in cool weather, it doesn't surprise me that when it gets hot and humid you had problems. Even though your problem seems fixed for the moment, there's no harm in getting your mixture checked and adjusted. If done properly, the correct air/fuel ratio will be set and should prevent a recurrence of the problem.
On another note, I'm sort of dumbfounded at your steadfast refusal to do something as simple as getting your mixture checked and adjusted. Rather than start testing and replacing sensors, vacuum lines, etc., a mixture check and adjustment is a simple process. Don't beat your head against the wall needlessly....eliminate the easy fixes (like mixture) first, and then do the more complicated ones.
On another note, I'm sort of dumbfounded at your steadfast refusal to do something as simple as getting your mixture checked and adjusted. Rather than start testing and replacing sensors, vacuum lines, etc., a mixture check and adjustment is a simple process. Don't beat your head against the wall needlessly....eliminate the easy fixes (like mixture) first, and then do the more complicated ones.
09-12-2007 | 03:44 PM
#42
Thread Starter
Race Car
Joined: Aug 2005
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From: Terrorizing your neighbourhood!
On another note, I'm sort of dumbfounded at your steadfast refusal to do something as simple as getting your mixture checked and adjusted. Rather than start testing and replacing sensors, vacuum lines, etc., a mixture check and adjustment is a simple process. Don't beat your head against the wall needlessly....eliminate the easy fixes (like mixture) first, and then do the more complicated ones.
But it was not acting up at the time.
Steadfast refusal maybe, this is a mechanical adjustment and will change the ratio all of time whether the air is heavy or not.
This has to be a electronic problem ...... I think.