|05-30-2012, 04:20 AM||#1 (permalink)|
Join Date: May 2012
Location: Portland, OR.
Thanked 0 Times in 0 Posts
'95 Caprice LT1 idling rough after plug change?
I have a '95 Caprice with a LT1 and it just turned 80,000 miles. At 80,000 I change the Spark Plugs to AC Delco Platinums and had the Transmission Flushed and Serviced. After doing this to it, it has developed a rough idle. The car has always idled so smooth, so this was a big surprise. It seems to idle worse when its in gear. It has plenty of power and doesn't hesitate at all. It just runs rough at idle. All the plugs were gaped 0.050". There are no check engine lights on. I'm really confused here....
|05-30-2012, 06:06 AM||#2 (permalink)|
Join Date: Jan 2009
Thanked 87 Times in 57 Posts
Trying to gap platinum plugs is likely to damage the platinum pucks.
I would look for a plug wire problem.
Look underhood in the dark, maybe bring a spray bottle with water to try and induce arcing.
At one point there was a bad batch of Delco plugs out there that leaked combustion pressure and you could see a blue glow underhood around the plugs when running in the dark.
96 Caprice with AI 200cc package
Best et 11.5
Best MPH 116
Just another taxi
|05-31-2012, 08:37 PM||#3 (permalink)|
The Unscrupulous Lt. Colonel
Join Date: Mar 2011
Thanked 26 Times in 15 Posts
+1 with DJ. But also, make sure all your plug wires are where they are suppose to be, and not crossed by accident. Remember, wire boots must click twice.
2001 Chevy Impala 3.4 - Traded
2004 Chevy Impala 3.4 - Traded
2002 Chevy Impala 3.4 - RIP 1.12.2011/ Ice Storm
1996 Chevy Impala SS - RIP 4.15.2012/ Asswipe
1996 Chevy Impala SS - Current
|06-01-2012, 06:21 AM||#4 (permalink)|
Join Date: Jan 2011
Thanked 233 Times in 127 Posts
Jackass of all Trades
Tri-9 Defined: 1994, 1995 or 1996 B-Body.
1994 9c1- 300,000 miles and counting.
|Thread||Thread Starter||Forum||Replies||Last Post|
|2006 3.9 Spark plug change||peterbilt123||8th Gen Engine Performance||14||06-03-2012 03:14 AM|
|84 Caprice 305/700R4 idling rough||HAFROD||Mechanical and Electrical Problems||2||02-04-2012 10:28 PM|
|3.8L Spark Plug Change Instructions???||54warrior||Chevy Impala 7th Gen Discussion||6||04-11-2011 12:42 PM|
|DIY spark plug change video||ljbrandt||Autocare and Maintenance||6||08-08-2010 05:46 PM|
|advice - spark plug change||elzorro||Chevy Impala 6th Gen Discussion||7||05-26-2009 01:12 AM|