Car feels sluggish
02-27-2008, 10:51 AM
#1
Staging Lane
Thread Starter
iTrader: (3)
Join Date: Apr 2007
Location: Atco, New Jersey
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
Car feels sluggish Hey guys im trying to track down some issues with my 99 z28 m6. The symptoms include;
Slight power loss
Poor gas milage (about 200 per tank)
occasional high idle
occasional hesitation in the mid rpm range
Im open to suggestions
Slight power loss
Poor gas milage (about 200 per tank)
occasional high idle
occasional hesitation in the mid rpm range
Im open to suggestions
03-04-2008, 09:24 PM
#6
TECH Fanatic
iTrader: (8)
Join Date: Oct 2005
Location: Holland Twp/Milford, New Jersey
Posts: 1,420
Likes: 0
Received 0 Likes
on
0 Posts
it could be a bad PCV valve causing all of these symptoms. it may be the EGR valve, as well. it could be a vaccuum leak, causing occassional high idle. a hesitation at midrange could mean a bad spark plug wire. it may also mean preignition. have you noticed the coolant temp during the hesitation? that could do it. it may be an 02 sensor causing bad mileage and sluggishness. it could also be a faulty fuel injector. i sure hope you don't have burnt valves, causing weak compression. it could also be a faulty TPS sensor too, although this is uncommon. it may be a clogged catalytic converter, as well.
03-05-2008, 03:09 AM
#7
TECH Addict
iTrader: (1)
Join Date: May 2007
Location: NY
Posts: 2,516
Likes: 0
Received 0 Likes
on
0 Posts
Yes the front O2's tell the computer how rich or lean your exhaust is and adjust the fuel and spark accordingly to compensate. The rear O2's (after the cats) determine by sniffing the exhaust how well the cats are working and will set an emissions code if they are not working up to specs.
