Fixed the rough idle!
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Senior User
Joined: Jan 2004
Posts: 157
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From: Buckeye, AZ
Fixed the rough idle!
Wow, I can't believe the difference. A little back ground here first.
The truck has the original 352, (it's been rebuilt at least once), with a early 70's C6, Edelbrock intake and 1405 4 bbl.
The idle was always rough, would surge, shudder and shake sometimes and then run smooth as can be at others. Really frustrating.
I replaced plugs, wires, cap, rotor, added Petrox ignition, adjusted the idle mixture and all this helped, but it still wasn't right. Next I went on a mission and started looking for vacume leaks. Replaced lines in the enjine bay and followed line down to the rear of the C6 where the modulator valve lived. After 2 tries at finding the correct one, I replace that this evening.
That was it! Idles so smooth and when in gear too. Before I had kinda feather the gas when in gear to maintain a smooth idle, not any more. I just couldn't believe a $8 modulator valve had such an effect on drivability.
I know it's no big deal, but it made my day big time and if it can help another back yard mechanic, great!
Thanks,
The truck has the original 352, (it's been rebuilt at least once), with a early 70's C6, Edelbrock intake and 1405 4 bbl.
The idle was always rough, would surge, shudder and shake sometimes and then run smooth as can be at others. Really frustrating.
I replaced plugs, wires, cap, rotor, added Petrox ignition, adjusted the idle mixture and all this helped, but it still wasn't right. Next I went on a mission and started looking for vacume leaks. Replaced lines in the enjine bay and followed line down to the rear of the C6 where the modulator valve lived. After 2 tries at finding the correct one, I replace that this evening.
That was it! Idles so smooth and when in gear too. Before I had kinda feather the gas when in gear to maintain a smooth idle, not any more. I just couldn't believe a $8 modulator valve had such an effect on drivability.
I know it's no big deal, but it made my day big time and if it can help another back yard mechanic, great!
Thanks,
