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Spark Plugs make a Difference?

  #1  
Old 01-03-2010, 11:11 AM
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Default Spark Plugs make a Difference?

Hi Folks,
Just had a general tune-up done on my '84. Decided to drop the car off for new wires/plugs, cap/rotor and oil change. Thought it would be a nice Christmas present for my little red sled. Well, it is actually running a little rougher at idle since the tune-up. Asked the mechanic what he thought of the poor performance after the tune-up he said "that it may be because I was using a plug that was too hot (Platinum V Groove) and that he changed the plugs back to the recommended plug. Does this sound right to you? The car was idling fine before. I just thought I'd replace the old ignition wires and plugs as they were getting old
 
  #2  
Old 01-03-2010, 12:51 PM
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Sure, running a hotter plug could have masked a running issue with the car. How rough is rough? I assume he plugged the wires back in the correct order.
 
  #3  
Old 01-03-2010, 01:27 PM
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Hi Doc,
Yeah, he plugged the wires in right, my only minor concern is that the car lost 100rpms at idle, a little rougher than it was. Idle was suprisingly smooth before at 950ish, now I'm idling at 900-. No big deal, although I didn't realize that the switch to a different plug would cause a slight reduction in the prior smooth idle. If I was sure that the hotter plug wouldn't be a concern for premature engine failures, I think I'd prefer the performance of the Platinum V plug, at least in reference to the way my car was running before.
 
  #4  
Old 01-03-2010, 05:06 PM
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Sounds like a simple idle adjustment to increase the RPMS' a 100 or so and you will be good to go.
 
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