Dads98mk8
New LVC Member
I got Dad's 98 Mark 8 out of the garage last week at 29,646 miles and have put about 800 miles on it. While I've had numerous fun moments burning the gunk out with some heavy feet and Lucas injector cleaner I have a couple of problems that aren't going away.
I have no previous maintenance experience with this type of car, so I don't know the regular problems that you guys run into. So, given these symptoms, where do you guys suggest looking first given the known issues of this model. (I have searched, but nothing has jumped out at me.)
1998 Mark 8 that has only had 3,000 miles put on it since 2003.
Runs up to 3,250 rpm like a scalded dog.
At anything less than 50 degrees outside it bucks like a drunken sailor between 3,250-3-750rpm. Even when above 50 degrees and at full operating temperature there is noticable hesitation in this rpm range.
Acceleration from 4,000rpm up is slower than keeping it below 3,200rpm. I haven't put a watch to it, but it's enough slower than you can tell by other cars and scenery.
I've run Lucas fuel injector cleaner with premium unleaded for 2.25 tanks and the following codes have come up when the CEL is illuminated.
Tank1
PO174: System to lean Bank 2.
Twice during the first 1/4 tank and once between 1/4 & 1/2 tank.
2 low speed backfires during this tank during acceleration.
Tank 2
No codes until less than a quarter of a tank, then a PO174: System to lean Bank 2.
1 low speed backfire occured during this tank during accleration in the first 1/4 tank.
Tank 3
About 45 miles of highway driving after fill-up and resetting the CEL from tank 2 then PO171 & PO174: System to lean Bank 1 & 2.
All CELs have occured at highway speeds, not under acceleration.
Average fuel economy a little over 18.5mpg in mixed city/highway driving 22.5mpg on highway only.
I'd guess I need to figure out where the fuel filter is, but I can't explain why it would run all the way to 6K with a partially blocked filter. The way it bucks and hesitates in the 3,000rpm range it seems more like a bad sensor (cheapish) or hopefully not an engine control module (ouch!).
What cha' think?
I have no previous maintenance experience with this type of car, so I don't know the regular problems that you guys run into. So, given these symptoms, where do you guys suggest looking first given the known issues of this model. (I have searched, but nothing has jumped out at me.)
1998 Mark 8 that has only had 3,000 miles put on it since 2003.
Runs up to 3,250 rpm like a scalded dog.
At anything less than 50 degrees outside it bucks like a drunken sailor between 3,250-3-750rpm. Even when above 50 degrees and at full operating temperature there is noticable hesitation in this rpm range.
Acceleration from 4,000rpm up is slower than keeping it below 3,200rpm. I haven't put a watch to it, but it's enough slower than you can tell by other cars and scenery.
I've run Lucas fuel injector cleaner with premium unleaded for 2.25 tanks and the following codes have come up when the CEL is illuminated.
Tank1
PO174: System to lean Bank 2.
Twice during the first 1/4 tank and once between 1/4 & 1/2 tank.
2 low speed backfires during this tank during acceleration.
Tank 2
No codes until less than a quarter of a tank, then a PO174: System to lean Bank 2.
1 low speed backfire occured during this tank during accleration in the first 1/4 tank.
Tank 3
About 45 miles of highway driving after fill-up and resetting the CEL from tank 2 then PO171 & PO174: System to lean Bank 1 & 2.
All CELs have occured at highway speeds, not under acceleration.
Average fuel economy a little over 18.5mpg in mixed city/highway driving 22.5mpg on highway only.
I'd guess I need to figure out where the fuel filter is, but I can't explain why it would run all the way to 6K with a partially blocked filter. The way it bucks and hesitates in the 3,000rpm range it seems more like a bad sensor (cheapish) or hopefully not an engine control module (ouch!).
What cha' think?
Are you Ferris Bueller's friend Cameron, who destroyed his father's Ferarri???
