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06-04-2008, 11:18 PM
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#1
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1,800 to 2,000 RPM idle in neutral
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Registered User
Join Date: Jan 2008
City: San Francisco
State: California
Posts: 64
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What could be the cause of this? I have already had the coolant sensor changed, the ACT sensor changed along with PCV Valve, PCV valve mesh. Sometime ago i cleaned the IAC and throttle body but this time it didn't work. Could it be that I need a new IAC? Could it be from a small anti-freeze leak from waterpump gasket? 
This is for a factory 1988 Mustang 5.0 GT. |
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06-05-2008, 09:20 AM
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#2
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Re: 1,800 to 2,000 RPM idle in neutral
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WTF^^...
Join Date: May 2003
City: Hoover / Florence
State: Alabama
Posts: 27,220
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you checked the timming to see how its set
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2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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06-05-2008, 09:37 AM
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#3
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Re: 1,800 to 2,000 RPM idle in neutral
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Mustang Evo NEWB
Join Date: Aug 2004
City: millville
State: New Jersey
Posts: 4,934
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Timing advance should be between 8 and 14, much different from that could cause idle issues
My 89 would 'stick' or 'hang' at 1200-1500 quite often, after replacing the IAC it was fine for about a year then started doing it again... wouldn't hurt to try a new IAC... Idle set screws should be fine... try the idle relearn procedure...
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1992 Mustang LX hatchback.. 1 of 542 black on black
2003 Regal GS - the beater/daily driver - somewhat stock. No its not a mustang, at least it's blown.
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06-05-2008, 12:00 PM
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#4
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Re: 1,800 to 2,000 RPM idle in neutral
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Human Mamogram
Join Date: May 2008
City: Baton Rouge
State: Louisiana
Posts: 1,760
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is that you in the avatar? if so ill just fly over and take a look for ya 
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2002 GT,T56,99 cobra aluminum block, Eagle rods,Mahle coated pistons,04 cobra crank,04 cobra heads/cams,UPR tubular K-member kit,full UPR solid race rear suspension,NOS direct port wet kit,fidanza flywheel, spec2+ clutch,motorsport 4:10s,full Hearthrob exhaust.(pretty much stock)
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06-05-2008, 02:30 PM
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#5
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Re: 1,800 to 2,000 RPM idle in neutral
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Deranged
Join Date: Jan 2005
City: Largo
State: Florida
Posts: 6,290
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Book Rob and myself a seat
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Mods-MAc CAI , True Dual Flowmaster 40,3.73 ,T-Lok, 25% UDP, 3/8 Phenolic Intake Spacer ,Steeda Tri-ax, SCT Chip/ Tune
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06-05-2008, 02:31 PM
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#6
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Re: 1,800 to 2,000 RPM idle in neutral
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Imma Ho...
Join Date: Aug 2004
City: Baton Rouge
State: Louisiana
Posts: 10,053
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Yeah, someone will need to supervise that youngin....
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06-05-2008, 11:36 PM
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#7
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Re: 1,800 to 2,000 RPM idle in neutral
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Registered User
Join Date: Jan 2008
City: San Francisco
State: California
Posts: 64
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It's at 11 degrees where it has been for many many years before this idle problem came along. |
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06-05-2008, 11:38 PM
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#8
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Re: 1,800 to 2,000 RPM idle in neutral
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Registered User
Join Date: Jan 2008
City: San Francisco
State: California
Posts: 64
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Last edited by Mercedez L.; 06-05-2008 at 11:42 PM.
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06-05-2008, 11:40 PM
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#9
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Re: 1,800 to 2,000 RPM idle in neutral
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Registered User
Join Date: Jan 2008
City: San Francisco
State: California
Posts: 64
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I was thinkin of getting a new IAC as I have already cleaned t his original IAC and throttle body but it didn't help this time. I believe LateModelRestoration sells it for $89.95 and hopefully it is a Ford part. |
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06-08-2008, 03:32 PM
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#10
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Re: 1,800 to 2,000 RPM idle in neutral
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ME hometown supporter
Join Date: Jan 2005
City: Harvest
State: Alabama
Posts: 948
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just pick one up at your local auto-junk parts store. I think thats going to be your best bet, sure sounds as if your IAC/IAB is hanging open... they will be cheaper than 50resto.
can I ask another question though? why is your base timing set at 11?
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5.4 liters of pushrod 
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06-09-2008, 03:45 PM
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#11
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Re: 1,800 to 2,000 RPM idle in neutral
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Talula Does the Hula
Join Date: Dec 2005
City: Baton Rouge
State: Louisiana
Posts: 2,869
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oh wow.... rob, herb, and jarod... good god i never seen someone get shutout so quick lol
QUICK!!! PURGE THE NOS! lmao
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06-10-2008, 01:18 PM
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#12
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Re: 1,800 to 2,000 RPM idle in neutral
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Deranged
Join Date: Jan 2005
City: Largo
State: Florida
Posts: 6,290
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Then you should have been at Joe Wheeler 
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Mods-MAc CAI , True Dual Flowmaster 40,3.73 ,T-Lok, 25% UDP, 3/8 Phenolic Intake Spacer ,Steeda Tri-ax, SCT Chip/ Tune
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06-10-2008, 01:29 PM
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#13
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Re: 1,800 to 2,000 RPM idle in neutral
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Imma Ho...
Join Date: Aug 2004
City: Baton Rouge
State: Louisiana
Posts: 10,053
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Yeah, no kidding....
Then again, I wasn't talking about her anyhow so...it doesn't matter to me. I was referring to the youngin' Jarrod....
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06-10-2008, 02:04 PM
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#14
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Re: 1,800 to 2,000 RPM idle in neutral
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Human Mamogram
Join Date: May 2008
City: Baton Rouge
State: Louisiana
Posts: 1,760
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ppsshhhht...ppsshhhht, hey ill drop it when i find out the answer to my question.
i aint no youngin'
yea just buy one from auto-zoo or something...sooo is it you or ur girlfriend???
__________________
2002 GT,T56,99 cobra aluminum block, Eagle rods,Mahle coated pistons,04 cobra crank,04 cobra heads/cams,UPR tubular K-member kit,full UPR solid race rear suspension,NOS direct port wet kit,fidanza flywheel, spec2+ clutch,motorsport 4:10s,full Hearthrob exhaust.(pretty much stock)
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