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#1
04-11-2011, 07:34 PM
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TPS or IAC?
Hi All,
Got an '87 GM that has a "slight up/down idle" when first starting. Only lasts a minute or so and then is fine. Sometimes a slight stumble from a stop. Likeliness culprit be a TPS or IAC?? Car has a little over 121K and have had it from brand new. Never remember changing the TPS but did the IAC a couple of years ago. Forgot to clean out the ports before install, though. Boy was that dumb!! Let me know your thoughts!! Thanks....MB 
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#2
04-12-2011, 09:17 AM
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Re: TPS or IAC?
Use a multimeter to check the resistance of the TPS as you move it.
It could also be a fuel pressure problem.
__________________
 2000 Mercury Grand Marquis LS - 119k / 14.89s @ 92.11MPH [ pictures | videos ] > Dual Flowmaster Delta 40s / J-Mod / PI Intake Manifold & Cams / Marauder Air Box & 80mm MAF / 3.55 Trac-Lok > Bumper Tuck / Steeda UD Pulleys / CVPI Zip Tube / Ported & Polished Plenum / BBK 70mm TB > BOC 93 Octane Tune / Headlight Relay Upgrade / 17mm rear stabilizer bar / Heinous Aluminum Billet Rear Control Arms > CVPI aluminum driveshaft
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#3
04-12-2011, 06:33 PM
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Re: TPS or IAC?
There is an Intake Air Temperature sensor on the drivers side front that will cause the problem you describe.
__________________
Being way2old is why I need help from younger minds The sooner you fall behind the more time you'll have to catch up.  HEY Y'ALL--READ THIS Here are some of our old vehicles for sale. 
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#5
04-13-2011, 01:10 PM
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Re: TPS or IAC?
Not sure about on a 5.0L, but on my 4.6L it was located on the top half of the air filter box.
__________________
2000 Mercury Grand Marquis LS - 119k / 14.89s @ 92.11MPH [ pictures | videos ] > Dual Flowmaster Delta 40s / J-Mod / PI Intake Manifold & Cams / Marauder Air Box & 80mm MAF / 3.55 Trac-Lok > Bumper Tuck / Steeda UD Pulleys / CVPI Zip Tube / Ported & Polished Plenum / BBK 70mm TB > BOC 93 Octane Tune / Headlight Relay Upgrade / 17mm rear stabilizer bar / Heinous Aluminum Billet Rear Control Arms > CVPI aluminum driveshaft
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#6
04-13-2011, 05:52 PM
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Re: TPS or IAC?
Yes, I had a '93 and also currently have a '95 and on the 4.6L, that is where it is. Didn't even know a 5.0 has one? Got to check the official manual as Rock Auto does list one for the 5.0.....MB
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#7
04-13-2011, 06:08 PM
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Re: TPS or IAC?
Look on the intake between 5 and 6 cylinders. it should be licated there if I remember correctly.
__________________
Being way2old is why I need help from younger minds The sooner you fall behind the more time you'll have to catch up. HEY Y'ALL--READ THIS Here are some of our old vehicles for sale.
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#9
04-13-2011, 07:01 PM
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Re: TPS or IAC?
Drivers side. Those little sensors are suspect to carbon build up on them.
__________________
Being way2old is why I need help from younger minds The sooner you fall behind the more time you'll have to catch up. HEY Y'ALL--READ THIS Here are some of our old vehicles for sale.
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