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Old 10-12-2006, 07:22 PM   #1
rigpin
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Member#: 31529
Join Date: Jan 2003
Chapter/Region: South East
Location: Greenville SC
Vehicle:
1974 datsun z
soon to be silver

Default odd issue with idle and driving

I've already searched and cleaned the iacv like the sticky said. The car is idling high around 1700 - 1500rpm and it hesitates a little while driving. I've checked the best I could for leaks around the vacuum lines and I'm running out of options

One thing that I've notaced is when I'm driving and let off the gas in gear I'm showing .05 instead of .01 on the factory boost gauge, is that right? Input is appreciated

My mods on the engine are just full catless ehaust with o2 simulator and a homemade grounding kit
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Old 10-13-2006, 02:45 PM   #2
rigpin
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soon to be silver

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bump up
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Old 10-13-2006, 05:29 PM   #3
TMessick
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High idle and high closed throttle manifold pressure both point to an uncontrolled air source going to the engine. Could be the throttle plate hanging up, IACV hanging up, or a vacuum leak happening somewhere after the throttle. This would also make you tend to run a bit lean (air entering the engine that hasn't passed through the MAF sensor) and cause a stumble on tip-in.

If you can't hear the vacuum leak, you may be able to find it with a propane torch. Turn on the propane a bit (don't light the torch) and move the tip around the intake/throttle body. When your RPM jumps, you've narrowed in on the vac leak (engine just sucked in some propane instead of air). Try not to blow yourself up tho...
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Old 10-13-2006, 10:24 PM   #4
rigpin
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1974 datsun z
soon to be silver

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Quote:
Originally Posted by TMessick View Post
High idle and high closed throttle manifold pressure both point to an uncontrolled air source going to the engine. Could be the throttle plate hanging up, IACV hanging up, or a vacuum leak happening somewhere after the throttle. This would also make you tend to run a bit lean (air entering the engine that hasn't passed through the MAF sensor) and cause a stumble on tip-in.

If you can't hear the vacuum leak, you may be able to find it with a propane torch. Turn on the propane a bit (don't light the torch) and move the tip around the intake/throttle body. When your RPM jumps, you've narrowed in on the vac leak (engine just sucked in some propane instead of air). Try not to blow yourself up tho...

Thanks man, appreciate the help, I thought it was a leak somewhere but damned if I could find it, she's now at the stealership and i'll let them tinker with it.
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Old 10-24-2006, 12:50 AM   #5
OvrClkdPmp
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Sage GReen

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bump did we get this figured out?
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