New spark plugs, wires, and fuel filter = backfire???

[Ed Kellock]

Have you rechecked the spark plug wire to/from locations?  Could be a
mis-timed fire on one or more.

Ed

> -----Original Message-----
> From: quattro-bounces at audifans.com 
> [mailto:quattro-bounces at audifans.com] On Behalf Of Doug Yoder
> Sent: Saturday, November 04, 2006 3:33 PM
> To: audi group
> Subject: New spark plugs, wires, and fuel filter = backfire???
> 
> 
> Patient is a 1993 100s - FWD, 12V V6, ~163k mi (my sisters car).
> 
> Complaint of low power.  I asked when plugs & wires were last 
> done, the reply was "not since I've owned it".  Replaced 
> them, the insulation on the plug ends of the wires was almost 
> gone on 5 of the 6 wires.  The old plug electrodes were 
> pretty worn, too.  Also replaced fuel and air filters, since 
> no history on them (air filter was pretty dirty too).  I also 
> suspect a bad head gasket on one side, as there was evidence 
> of coolant splattering the engine bay, and the coolant 
> reservoir hissed when I loosened spark plug #6.
> 
> Put it all back together, started it up, and heard this 
> horrible popping sound coming from the exhaust.  Sounds kind 
> of like misfiring into the exhaust, but the engine itself is 
> smooth.  STRONG exhaust puffs out the tailpipe coinciding 
> with the popping.  Seems almost like extra fuel in the 
> exhaust system is burning off, but if so, where did it come from?
> 
> I'm afraid to drive the car right now, it sounds like the 
> exhaust is going to come flying off the car or something.  
> Anyone have any ideas?
> 
> -- 
> Doug Yoder
> 
> "Don't tell me the sky's the limit - there's footprints on 
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