whats the normal idle?

sickfox · June 28th, 2009, 02:31 PM

On my 89 gt it idles at say 900 rpm then after a few minutes it goes to 1000 is that normal, i like it better at 900 it has a good sound to it but when it goes p it sounds like a deep bass which aint bad but just wondering if its normal. my exhuast is ford motorports 1 5/8 equal length shorty headers, flowmaster american thunder exhaust (turndowns after muffler before axle) no cats. any input will be nice on if thats normal or if i need to change the ips or?..

flattusmaximus78 · June 28th, 2009, 02:33 PM

Do you have the factory tach?

sickfox · June 28th, 2009, 02:37 PM

Originally Posted by flattusmaximus78

Do you have the factory tach?

unfortunately i have all the factory gauges :'( my amp lights always on and low coolent also. but its charging and full of coolent. so ha yeah i should get new ones.

1slo5.0 · June 28th, 2009, 02:44 PM

Originally Posted by turbofoxbody

unfortunately i have all the factory gauges :'( my amp lights always on and low coolent also. but its charging and full of coolent. so ha yeah i should get new ones.

Your factory tach is wrong.

sickfox · June 28th, 2009, 02:45 PM

Originally Posted by 1slo5.0

Your factory tach is wrong.

ok great, now lets try this. whats it the answer to the question i asked.

83 5.0 · June 28th, 2009, 02:57 PM

Check the sticky's for idle setting, I,m not sure what the base idle RPM is actually as my car is carbed and I keep it around 700 rpm.

Mustang idle surge and base idle reset

These links might help with your wirirng issues with the dash lights, Good Luck

Mustang FAQ - Engine Information

sickfox · June 28th, 2009, 03:13 PM

Originally Posted by 83 5.0

Check the sticky's for idle setting, I,m not sure what the base idle RPM is actually as my car is carbed and I keep it around 700 rpm.

Mustang idle surge and base idle reset

These links might help with your wirirng issues with the dash lights, Good Luck

Mustang FAQ - Engine Information

thank you for that information.

its good to get useful info!

sickfox · June 28th, 2009, 03:16 PM

Originally Posted by 1slo5.0

Your factory tach is wrong.

answered without answering thanks that sticky in good piece of info.

flattusmaximus78 · June 28th, 2009, 03:35 PM

Like darrel said, along iwht what I was going to get at. It's wrong. My tach idles at 400-500, with a timing light on it shows a solid 750 rpm idle.

83 5.0 · June 28th, 2009, 05:23 PM

Originally Posted by turbofoxbody

thank you for that information. its good to get useful info!

No Problem, if we all share a bit of what we know somethings got to work.

sickfox · June 28th, 2009, 09:38 PM

Originally Posted by flattusmaximus78

Like darrel said, along iwht what I was going to get at. It's wrong. My tach idles at 400-500, with a timing light on it shows a solid 750 rpm idle.

so even with an aftermarket tach it will be wrong?? and what tach do you all suggest?

sickfox · June 28th, 2009, 09:41 PM

Originally Posted by 83 5.0

No Problem, if we all share a bit of what we know somethings got to work.

true story man! i like to learn new things, i didn't pop out of my mother with knowing everything mustang like some did. (altho i wish i did)

flattusmaximus78 · June 28th, 2009, 09:54 PM

No, just factory.

sickfox · June 28th, 2009, 10:08 PM

Originally Posted by flattusmaximus78

No, just factory.

ok i already new that, lets forget i even have one... i can tell by my motor that my car idles low then higher after a few minutes or if i get on the highway when i get off it has an even higher idle and it wont go below that base idle.

i just bought the car, it sat for 4 years. its new i want to know where to start or where to look first.

baine21225 · June 28th, 2009, 10:20 PM

get an aftermarket tack for starters, autometer is nice

Chris951 · June 28th, 2009, 10:35 PM

My factory tach says about 750. I hooked up an aftermarket tach and it read 650. Mine idles at 650..

baine21225 · June 28th, 2009, 10:47 PM

at some spots in the rev range my stocker is about 800 rpms off......pretty substancial difference if you ask me

1fst5.0 · June 28th, 2009, 10:48 PM

is it normal for your idle to drop a little when u push the clutch in?

sickfox · June 28th, 2009, 11:46 PM

ok im just gonna get an autometer tach, its simple enough. but i still am wondering why my idle is staying high when i get off highway. or why it even jumps up when im at idle. just a bad tps?

Chris951 · June 29th, 2009, 12:02 AM

clean the IAC, Throttle body, set TPS voltage. See if that works. Mine did the same as yours and I did those things and it never fixed it. Then I saw darrell's sticky and tried the salt and pepper shaker connecter thing and it solved my idle problems.

June 28th, 2009, 02:33 PM	#2
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	Do you have the factory tach? __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

June 28th, 2009, 02:57 PM	#6
83 5.0 Regular Join Date: Aug 2006 Location: Toronto Ont. Canada Posts: 278 iTrader: 0 reviews	Check the sticky's for idle setting, I,m not sure what the base idle RPM is actually as my car is carbed and I keep it around 700 rpm. Mustang idle surge and base idle reset These links might help with your wirirng issues with the dash lights, Good Luck Mustang FAQ - Engine Information Last edited by 83 5.0; June 28th, 2009 at 03:00 PM.

June 28th, 2009, 03:35 PM	#9
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	Like darrel said, along iwht what I was going to get at. It's wrong. My tach idles at 400-500, with a timing light on it shows a solid 750 rpm idle. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

June 28th, 2009, 09:54 PM	#13
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	No, just factory. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

June 28th, 2009, 10:20 PM	#15
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	get an aftermarket tack for starters, autometer is nice __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

June 28th, 2009, 10:35 PM	#16
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	My factory tach says about 750. I hooked up an aftermarket tach and it read 650. Mine idles at 650..

June 28th, 2009, 10:47 PM	#17
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	at some spots in the rev range my stocker is about 800 rpms off......pretty substancial difference if you ask me __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

June 28th, 2009, 10:48 PM	#18
1fst5.0 Regular 1986 mustang gt Join Date: Apr 2009 Location: el paso tx Posts: 189 iTrader: 0 reviews	is it normal for your idle to drop a little when u push the clutch in?

June 29th, 2009, 12:02 AM	#20
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	clean the IAC, Throttle body, set TPS voltage. See if that works. Mine did the same as yours and I did those things and it never fixed it. Then I saw darrell's sticky and tried the salt and pepper shaker connecter thing and it solved my idle problems.

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