i have a 92 z, with a 305 tpi-5speed. a couple days ago it started acting stupid. when i come to a stop the rpms will drop down to round 500, and just lope, like i got a cam in the thing. Once you go up into the rpms though, it acts like nothings wrong. Granted it ran excellent before this happened, what in the hell could be wrong? Any info would be appreciated.

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92 Z-28
305 -5speed
160 thermo.
K&N Air Filters
B&M Ripper
14.7 @ 96mph

 

hey man i just went through the same thing with my 305 no coeds were comeing up on the computer. it ended up being my plugs.they were a cherry red on one side my guess it was from where my converter clogged up on me.needles to say its not there anymore

 

My MAP sensor was crap(although it was new) and it caused this same symptom. I bought a Borg Warner MAP and it fixed the prob.

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"84Z28/'91 305TPI comp cam flowmaster TB coolant bypass/shutoff valve to heater core MAT relocated Ram-Air(home-made) gutted air-box IROC ground effects/wheels GY245/50's 700R4 superior shift kit/ corvette servo(excellent shift kit BTW) Rebuilt engine and transplanted it myself. Love this engine!
LOW performance people should drive low performance vehicles!

 

Scott,

If you're not getting any "coeds" coming up on your computer, you're not visiting the correct porno sites. Just pullin' yer chain, dude...

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ZDaddy,

Try cleaning the IAC air passages and pintle. If the problem persists, you might want to remove the IAC for a more thorough cleaning and a single drop of engine oil on the pintle worm gear/shaft.

If the TPS and throttle minimum air position are both set correctly, the IAC should be able to modulate air to maintain the proper RPM at idle. Target idle on a TPI is 600-650 RPM in DRIVE, or about 800-850 RPM in neutral on your manual.

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Later,
Vader
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"Make Me Bad"
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