RPM Variation @ Idle & Acceleration
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Junior Member
Joined: Apr 2004
Posts: 9
Likes: 0
From: Houston
Car: 1989 Camaro IROC-Z
Engine: L98 5.7TPI
Transmission: TH700R4
RPM Variation @ Idle & Acceleration
The RPM of the engine goes up and down regardless of being at idle or under acceleration. Engine is very healthy and has OEM Cam. What are the usual bugs to looks for?
Supreme Member
Joined: Apr 2002
Posts: 3,552
Likes: 5
From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
I'd start looking for vaccum leaks.. Cracked vac hoses/lines, disconnected lines, bad diaphram in your brake booster.. anything that uses vaccum.....
Supreme Member
Joined: Jul 2001
Posts: 3,931
Likes: 0
From: Palm Bay, Florida, USA
Car: 95 E-150 & 07 Kawasaki ZX-6R
Engine: A slow one & a fast one
Transmission: A bad one & a good one
Axle/Gears: A weak one & a chained one
Haven't met a third gen V6 that doesn't have a slightly erratic idle so far.....but under acceleration definitely indicates more than some minor glitch.
Any check engine codes? Does it kind of drop out on you or does it actually misfire or backfire or anything?
Any check engine codes? Does it kind of drop out on you or does it actually misfire or backfire or anything?
Supreme Member
Joined: Apr 2002
Posts: 3,552
Likes: 5
From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
V6? I was assuming he was talking about the L98 he has listed under "Engine"
Supreme Member
Joined: Jul 2001
Posts: 3,931
Likes: 0
From: Palm Bay, Florida, USA
Car: 95 E-150 & 07 Kawasaki ZX-6R
Engine: A slow one & a fast one
Transmission: A bad one & a good one
Axle/Gears: A weak one & a chained one
My fault....I usually browse the V6 section only...forgot I was in the general tech section. 
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