89 LX Idleing Funny Please Help

Steves LX · November 15th, 2006, 03:19 PM

I have a 89 LX 302 bored .30 over 24 lb injectors, 65 CFM MAF/K&N filter,75MM Throttle Body, 303 cam, Amongst other goodies. I am only idleing at 800 RPM and it varys from higher to a smidge lower. Hard to keep started in cold weather until its warmed up. I have been told that is the throttle position sensor causing all that. Does anyone else have any ideas or is that what it is? I hate to spend 60.00 on something I cant return if thats not it.

And another problem I'm having is if I am idleing all my lights are very dim but if I give it gas everything brightens up. My volt meter goes from 9Volts to 13 or so. It really drops at idle if I have the heater on. I replaced the altenator and still doing it. Anyone have a clue what this might be?

95opal · November 17th, 2006, 05:34 PM

Your dimming lights are probally due to underdrive pullies. What 303 cam do you have b,e,f,x,z ? Your fluctuating idle is more than likely some minor tuning issues I would imagine. Have you checked for vac leaks? You can always reset your base idle again and see what happens.

quiksilvrstang · December 2nd, 2006, 11:05 PM

Sound like your IAC to me.. take it off and check it for carbon build up.

cobraetti · December 9th, 2006, 04:56 PM

for me I had to reinstall the factory ALT. pulley. The under drive pulley caused the dimming and poor idle for me.

88lxpe · December 28th, 2006, 05:29 PM

unless you have had your mass air meter recalibrated to 24# injectors the car is going to be on the rich side especially in colder weather like any engine is supposed to. the idle will be affected by this due to being rich. also if you do have underdrive pullies the idle also will be affected. the tps and the iac depend on a constant 5v reference from the computer. if the alternator cant keep the battery voltage up the 5v wont be accurate to these sensors and therefor the idle will be screwed up.

November 15th, 2006, 03:19 PM	#1
Steves LX Newbie Join Date: Nov 2006 Posts: 32	89 LX Idleing Funny Please Help I have a 89 LX 302 bored .30 over 24 lb injectors, 65 CFM MAF/K&N filter,75MM Throttle Body, 303 cam, Amongst other goodies. I am only idleing at 800 RPM and it varys from higher to a smidge lower. Hard to keep started in cold weather until its warmed up. I have been told that is the throttle position sensor causing all that. Does anyone else have any ideas or is that what it is? I hate to spend 60.00 on something I cant return if thats not it. And another problem I'm having is if I am idleing all my lights are very dim but if I give it gas everything brightens up. My volt meter goes from 9Volts to 13 or so. It really drops at idle if I have the heater on. I replaced the altenator and still doing it. Anyone have a clue what this might be?

November 17th, 2006, 05:34 PM	#2
95opal Enthusiast 95 opalfrost gt Join Date: Nov 2006 Location: Connecticut Posts: 988	Your dimming lights are probally due to underdrive pullies. What 303 cam do you have b,e,f,x,z ? Your fluctuating idle is more than likely some minor tuning issues I would imagine. Have you checked for vac leaks? You can always reset your base idle again and see what happens. __________________

December 9th, 2006, 04:56 PM	#4
cobraetti Regular 2001 svt cobra 10's I wish Join Date: Aug 2006 Location: goose creek,sc Posts: 245	for me I had to reinstall the factory ALT. pulley. The under drive pulley caused the dimming and poor idle for me. __________________ created 5/29/2001 on Tuesday, #1249 of 3867 1 of 556 in silver metallic

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December 2nd, 2006, 11:05 PM	#3
quiksilvrstang Newbie Join Date: Aug 2006 Location: Bowling Green Ky Posts: 13	Sound like your IAC to me.. take it off and check it for carbon build up.

December 28th, 2006, 05:29 PM	#5
88lxpe Newbie Join Date: Dec 2006 Posts: 4	unless you have had your mass air meter recalibrated to 24# injectors the car is going to be on the rich side especially in colder weather like any engine is supposed to. the idle will be affected by this due to being rich. also if you do have underdrive pullies the idle also will be affected. the tps and the iac depend on a constant 5v reference from the computer. if the alternator cant keep the battery voltage up the 5v wont be accurate to these sensors and therefor the idle will be screwed up.

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