should I have to use mid grade for LG4 86 IROC?
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Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: should I have to use mid grade for LG4 86 IROC?
None of these cars require anything more than regular from the factory.
If you're getting knock then you have a different problem.
If you're getting knock then you have a different problem.
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Car: 1986 Iroc z
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.73
Re: should I have to use mid grade for LG4 86 IROC?
Timing is too far advanced.possibly. i use premium 93 in all my vehicles ONLY!!
#5
Re: should I have to use mid grade for LG4 86 IROC?
Why do you only use 93? I would think I would get better performance out of my tbi w/93 since I have a spark knock sensor.. the lack of knock, the more the timing should stay advanced.. Do you know if this is the case?
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Check your EGR valve. It isn't uncommon for the exhaust passages of the EGR circuit to get plugged, which will give you pinging under light acceleration.
But check the timing as well. Unless it's been moved, though, that shouldn't change.
But check the timing as well. Unless it's been moved, though, that shouldn't change.
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Car: 1986 Iroc z
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.73
Re: should I have to use mid grade for LG4 86 IROC?
I only use 93 because my car seems to perform better. Thats a matter of preference. Some people have better luck with 87 octane. Most manufactures reccommend 87. Although i had a 94 Cadillac eldorado and the book said to use ONLY Premium 93 octane in its Northstar v8. I would check the things that 57kid said as well. Also if your knock sensor has not been changed i would change it anyway. every little bit helps. good Luck
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Car: 1986 Iroc z
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.73
Re: should I have to use mid grade for LG4 86 IROC?
Also remember if you check your timing make sure you unplug the wire that goes to the distributer before you set your timing. Then plug it back in afterwards after timing is set.
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