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Re: 2001 300m won't stay running
[Re: tripleblackcuda]
#1357730
12/23/12 05:03 PM
12/23/12 05:03 PM
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Joined: Jan 2007
Posts: 2,431
SK,Canada
gregsrt
top fuel
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top fuel
Joined: Jan 2007
Posts: 2,431
SK,Canada
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Could be a throttle position sensor or it could be a weak battery. The TPS must read a certain amount of voltage in order to work correctly. Check the battery first .
An association of men who will not quarrel with one another is a thing which has never yet existed, from the greatest confederacy of nations down to a town meeting or a vestry.
Thomas Jefferson
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Re: 2001 300m won't stay running
[Re: tripleblackcuda]
#1357734
12/24/12 01:52 AM
12/24/12 01:52 AM
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Joined: Jun 2003
Posts: 4,872
connecticut
pnypwr
master
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master
Joined: Jun 2003
Posts: 4,872
connecticut
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check your air tube to the maf if it has one...been down that road!
"Are you gonna bark all day lil doggy? Or are you gonna bite?"
05 ram 2500 ctd
74 gremlin x 360
65 mustang 347
70 coronet R/T 440
03 Mach 1
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Re: 2001 300m won't stay running
[Re: Triple Threat]
#1357736
12/24/12 03:44 AM
12/24/12 03:44 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Is the Check Engine lite on ? 9 out of 10 times this is a dirty throttle body. Carbon builds up enough arond the throttle baldes and in the IAC (idle air contol) and it does not get enough air to idle. The IAC will make up for it but it cant do it fast enough so it stalls. The PCM is programed for a certain amout of steps on the IAC at certain temps. Now when you start the car if the idle is to low the PCM will run the IAC steps up and advance the timing some to try and hold an idle. But as I said it cant to it fast enough if the throttle body is dirty enough.
Thats what I see the most but I have had times when the IAC may be bad or the EGR valve may stick open at idle.
Generally the TPS will not cause that as the PCM has a programed idle speed if it doesn't get a reading from .5 to about 1 volt at idle. Most of the time a bad TPS acts like a bad acellerator pump in a carb and causes a hesitation. Also if the battery has gone dead or been drawn down to a low voltage the PCM can forget the idle IAC setting and has to relearn it which takes some time and of course it wont hold and idle when its relearning the IAC steps. Ron
Last edited by 383man; 12/24/12 03:47 AM.
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Re: 2001 300m won't stay running
[Re: 383man]
#1357737
12/24/12 08:11 AM
12/24/12 08:11 AM
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Joined: Feb 2010
Posts: 1,377
Ohio
Todd
pro stock
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pro stock
Joined: Feb 2010
Posts: 1,377
Ohio
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Quote:
Is the Check Engine lite on ? 9 out of 10 times this is a dirty throttle body. Carbon builds up enough arond the throttle baldes and in the IAC (idle air contol) and it does not get enough air to idle. The IAC will make up for it but it cant do it fast enough so it stalls. The PCM is programed for a certain amout of steps on the IAC at certain temps. Now when you start the car if the idle is to low the PCM will run the IAC steps up and advance the timing some to try and hold an idle. But as I said it cant to it fast enough if the throttle body is dirty enough.
Thats what I see the most but I have had times when the IAC may be bad or the EGR valve may stick open at idle.
Generally the TPS will not cause that as the PCM has a programed idle speed if it doesn't get a reading from .5 to about 1 volt at idle. Most of the time a bad TPS acts like a bad acellerator pump in a carb and causes a hesitation. Also if the battery has gone dead or been drawn down to a low voltage the PCM can forget the idle IAC setting and has to relearn it which takes some time and of course it wont hold and idle when its relearning the IAC steps. Ron
 x2
Great job of explaining that  I was going to but didn't want to have to do all that typing. 
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