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1992 RS Low/Mid RPM rumble/vibration.

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Old 05-13-2012, 06:02 PM
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1992 RS Low/Mid RPM rumble/vibration.

If been having an issue where I press on the gas bring the car to about 1.6-2k rpm with goes up but immediately drops to about 1.5krpm and shakes the care as if struggling for fuel. If I accelerate a bit harder say for 2-2.2krpm no issue. Pretty recent rotor, distributor cap, plugs, wires, fuel filter, and it does burn a bit of oil id say a little less than a quart between changes not sure if that would contribute. No knocks or pings i can run the codes tomorrow see if and show up but the check engine light come on occasionally. Also heats up if sitting in traffic fan does come on when I turn on the defroster so that working and no fluid leak may be dirty fluid but need a day of work to flush and fill any other thoughts would be appreciated thank you.
Old 05-13-2012, 06:07 PM
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Car: 88 RS Camaro,70 chevelle,92 Geo
Engine: 305 TBI
Transmission: 5 Speed Manual
Re: 1992 RS Low/Mid RPM rumble/vibration.

Engije mounts... Tranny... Torque arm mount?
Old 05-15-2012, 06:43 PM
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Car: 92 rs daily driver work in progress
Engine: 3.1 , 204/214 cam
Transmission: 700 r-4, b& m megashifter
Axle/Gears: I want a posi with rear discs
Re: 1992 RS Low/Mid RPM rumble/vibration.

Sometimes low fuel in the tank during hard cornering or hard braking, can cause almost like fuel starvation.
Check for vacuum leaks?
Throttle position sensor?
Idle air control valve?
All the wires to the coil tight?
All the plug wires pushed on all the way?

Those are top of the head things I can think of.
Fasteddie, maverick and a few others here can help or at least point you in the right direction to look.
There is a great bunch of third gen family here that will try to help as much as possible.

Oh yeah how's the fuel filter look?
Old 05-15-2012, 07:14 PM
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Car: 88 RS Camaro,70 chevelle,92 Geo
Engine: 305 TBI
Transmission: 5 Speed Manual
Re: 1992 RS Low/Mid RPM rumble/vibration.

i replaced my fuel filter... i think i dont have an idle air control valve
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