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#1
09-08-2005, 09:47 AM
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Shakes when idle
I have a 94 mustang gt, needed to change my plugs cause car was shaking a bit when accelerating, replaced plugs, car shakes when idling, slight shake when accelerating past 1 rpm otherwise once pasted 1rpm is good. Should i replace my cables? they still look good last i changed was last september 04.
Also my rpm moves sparatically does not stay still. Rpm also surges up & down at times. 
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#2
09-08-2005, 02:06 PM
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I would check all hoses for any cracks-vacuum hoses that is, make sure your pcv valve is sucking out good (pull it out of the engine while it's running, feel for a good suction)..
As far as idling jumping, honestly..i NEVER met a 5.0 that DID'NT do that. My bro has a 5.0 91 tbird, my buddy a 90 fox gt, and i've seen several in the past. They all had that rough idle, hopped from 700 to 800.. AND they did rattle the cabin when accelerating in a "spirited" manner. Those plug wires should be good also..
__________________
"And Death Shall Have No Dominion" Dead men naked, they shall be one With the man in the wind and the west moon When their bones are picked clean and the clean bones gone They shall have stars at elbow and foot Though they go mad, they shall be sane Though they sink through the sea They shall rise again Though lovers be lost love shall not And death shall have no dominion..... ....Dylan Thomas....
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#3
09-08-2005, 03:03 PM
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Re: Shakes when idle
Yes the plug wires should be good, unless they have been laying on the headers or something lol. Also it may be worth your while to check the plugs you just put in to make sure that you didnt accidently close the gap on the electrode-ground during installation. I have seen the confuse people more times than one. As far as the rpm surge or eratic idle could be cause by a failing TPS. I think the voltage should be about .9 on the TP Sensor (correct me if I'm wrong). But as previously stated check pcv, vacuum, plugs/wires, and you may want to look into the TPS. Good luck.
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1969 Cougar 357w & TKO - 475hp
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#4
09-09-2005, 08:07 PM
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I can't say for sure about ur motor, but on my 2.3, the ICM went bad and finally the check engine light came on. The tell tell sign of my problem was the tach started acting erratic since the icm directly outputs to it. Hope this helps.
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1993 Mustang LX 2.3 4 cyl 105 hp Reef Blue Mods:215/60R15 Tires, 3G Alternator Upgrade, Removed Air Intake, K&N Air Filter, Tinted Windows, Upgraded to JL Speakers, JVC KD-AR3000 HU Sealed Box with 2-10" 4000 MTX Road Thunder Subs, MTX Road Thunder RT202 Amp, JL 3.5, 6x8, and Pioneer 6.5 = 6 speakers, UnderBody Neons, Corbeau Sport Seats w/lumbar support,KYB GR2 struts/shocks
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#5
09-15-2005, 10:44 AM
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Re: Re: Shakes when idle
Where is the pcv located?
My 94 5.0 has about 124000 miles on it, is it time to replace the timing chain? I was reading that eratic idle might be caused by a worn timing chain. Last edited by albert3029; 09-16-2005 at 10:24 AM.
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#6
09-16-2005, 10:41 AM
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Re: Re: Re: Shakes when idle
Where is the pcv located?
My 94 5.0 has about 124000 miles on it, is it time to replace the timing chain? I was reading that eratic idle might be caused by a worn timing chain.
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