93 sc auto

P

pock1

Registered User
doing some work on the 93 sc auto. changed the motor mounts...........what a !@#$%^&*() in the butt.go everything back together..............now car is stalling when u put in reverse or drive.my idle in neutal 900.when u shift into reverse.idle dropps to bout 700.i rechecked all vacime lines,intercooler pipes. car idles fine and smooth when i rev it, i hear no hissing sounds resealed intercooler pipes.how ever on the passenger side i found the plugsto be old and worn.the car had the nwer double plats in them.......i had a old set of factory spark pugs that i put in. could use some help guys.:(
 
pock1 said:
doing some work on the 93 sc auto. changed the motor mounts...........what a !@#$%^&*() in the butt.go everything back together..............now car is stalling when u put in reverse or drive.my idle in neutal 900.when u shift into reverse.idle dropps to bout 700.i rechecked all vacime lines,intercooler pipes. car idles fine and smooth when i rev it, i hear no hissing sounds resealed intercooler pipes.how ever on the passenger side i found the plugsto be old and worn.the car had the nwer double plats in them.......i had a old set of factory spark pugs that i put in. could use some help guys.:(
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What is your vacuum reading at idle in park?
 
RalphP said:
That really SUCKS!!! 900 inches of vacuum is ... better than absolute! :D:D

Question was "What's the vacuum", not "What's the RPM".

RwP
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oop boost gauge starts in the middle. then at idle 18-19 .in the hg range.if im reading it rite.just checked my 90 and same range.
 
93

90sc35thann said:
That's good vacuum. Is your iac plugged in?
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yes it checked that to ,while car was running at park in idle i unpulgged it.car shut off....hopefully meaning it's working.i was thinking.maybe the old plugs i put in on the passenger side.
 
93

pock1 said:
yes it checked that to ,while car was running at park in idle i unpulgged it.car shut off....hopefully meaning it's working.i was thinking.maybe the old plugs i put in on the passenger side.
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well im still checking today, put the hood all the way up (straight up) held with a long scredriver to get a good look at the rear.egr all behind the back of the fuel rail.......found 1 small thin vac line cracked. tapped it and still the same.i stated the car. put the car in drive.(put my feet on gas nad brake......put a load on it) now i hear funny noise comming from the tb........(humming noise and the ilde is mow going up n down..fluxuaing..how ever u spell it lol.im thinking the iac is hanging up or the ipsenser.
 
pock1 said:
well im still checking today, put the hood all the way up (straight up) held with a long scredriver to get a good look at the rear.egr all behind the back of the fuel rail.......found 1 small thin vac line cracked. tapped it and still the same.i stated the car. put the car in drive.(put my feet on gas nad brake......put a load on it) now i hear funny noise comming from the tb........(humming noise and the ilde is mow going up n down..fluxuaing..how ever u spell it lol.im thinking the iac is hanging up or the ipsenser.
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I know the Throttle Bodies sometimes get vacuum leaks arounnd the throttle plate shaft. It typically doesn't affect engine performance. The roaming idle could be a faulty IAC. Try unplugging the IAC and see if the idle stops roaming. If it does your IAC is defective.
 
93

90sc35thann said:
I know the Throttle Bodies sometimes get vacuum leaks arounnd the throttle plate shaft. It typically doesn't affect engine performance. The roaming idle could be a faulty IAC. Try unplugging the IAC and see if the idle stops roaming. If it does your IAC is defective.
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finally found the problem..........bad IAC........i had a spare cleaned it up put in on,...........idle came up to 1100 rpm an stayed .let in run for 10m ins shifts fine now. thx guys.:D
 
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