Idles fine but runs like crap under load
#1
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Car: 2006 GTO
Engine: LS2
Transmission: M6
Axle/Gears: 3.46 LSD
Idles fine but runs like crap under load
I just installed a new distributor, plugs, and wires. Set base timing. It idles fine, but tach is off. Put it in D and it shakes real bad and has no power. Tach reads 2500 rpm but sounds normal. Bad distributor? Module? Should I reset the ECM? Going to double check all plugs and wire fitting tomorrow, as well.
I would search, but it won't work on my phone.
I would search, but it won't work on my phone.
#2
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Idles fine but runs like crap under load
If it ran fine before you swapped all those parts, recheck your plug wires. It's very common to get 5 and 7 mixed up.
18436572
Rotation is clockwise
When #1 piston is at TDC, the rotor should be pointing at the terminal for the #1 plug wire.
18436572
Rotation is clockwise
When #1 piston is at TDC, the rotor should be pointing at the terminal for the #1 plug wire.
#3
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Car: 2006 GTO
Engine: LS2
Transmission: M6
Axle/Gears: 3.46 LSD
Re: Idles fine but runs like crap under load
It ran ok before the swap, had misfiring issues. Couple plugs had a bridged gap. Its possible I switched up the firing order, I was in a hurry.
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Car: 1988 IROC-Z Camaro, 1981 Trans Am
Engine: 350 TPI, 301 N/A
Transmission: 700r4, 350thm
Re: Idles fine but runs like crap under load
Id say firing orders screwed up, or timing is out of whack.
#5
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Car: 2006 GTO
Engine: LS2
Transmission: M6
Axle/Gears: 3.46 LSD
Re: Idles fine but runs like crap under load
While setting the base timing, it was a steady 6*. But once that EST was connected, it didn't want to run right. But in my haste, I might have messed up with the firing order, or forgot something. Here's hoping for a "D'oh" moment. Haha.
#6
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Car: 2006 GTO
Engine: LS2
Transmission: M6
Axle/Gears: 3.46 LSD
Re: Idles fine but runs like crap under load
It was the cap and rotor. The second MSD cap/rotor to fail on me, out of the box, for a V8. But the one on my Camaro (2.8) works perfectly. So far, O'reilly's premium cap and rotor work better and about 1/2 the price. No issues with other MSD products, just those V8 caps and rotors...I must be unlucky there, haha!
A good lesson here, the cap and rotor can make for a nasty symptom.
A good lesson here, the cap and rotor can make for a nasty symptom.
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