[Deleted]
Champion
Joined: Feb 2005
Posts: 3,710
Likes: 2
From: Skagit County, WA
RE: 1999 1500 5.9L poor power & gas mileage after dealer tune up
sounds like the death flash. Wasn't the death flash intended to reduce pinging under load? I haven't heard anybody recover from this one without switching to the mopar performance ecu and 91 octane gas.
But if they did a hydrocarbon test on your coolant and you're getting exhaust in it then there's either a crack somewhere or a head gasket going bad.
But if they did a hydrocarbon test on your coolant and you're getting exhaust in it then there's either a crack somewhere or a head gasket going bad.
Veteran
Joined: May 2004
Posts: 414
Likes: 0
From: TBK Enterprises
RE: 1999 1500 5.9L poor power & gas mileage after dealer tune up
I agree.
I would buy a Hypertech performance tuner, it will rid of all the problems, and you can always tune it back to stock to take it to the dealer.....
I would buy a Hypertech performance tuner, it will rid of all the problems, and you can always tune it back to stock to take it to the dealer.....