1994 Mark VIII engine/power troubles

greenehoosier

New LVC Member
Joined
Jun 28, 2012
Messages
6
Reaction score
0
Location
Southern Indiana
My Mark runs great above about 2200 rpms, really screams. It will still bark the tires at 60mph. Anywhere below that RPM it is a real dog, I get a miss and a backfire. Under steady acceleration, under load, I get a miss. If I floor it above that RPM level it really lets loose. The only things I have done to it are new plugs (did not change anything) and the seafoam treatment. Any ideas? Yes, there is a CEL, but it has been on since I have owned it- before the problem. Is there a cheap code reader for these? Thanks!
 

sprocket

Well-Known LVC Member
Joined
Jan 28, 2013
Messages
448
Reaction score
13
Location
Hastings
Read the codes. How long have you had the car? I would have had the codes read on day one. Actually I wouldn't have bought it without checking the codes if the CEL was on. There's something wrong or the CEL wouldn't be on. Do that right away and then post the results.

Basically you're taking a car that has a problem somewhere and flooring it. I'm not sure that is a good idea...
 

chargerxr

Dedicated LVC Member
Joined
Jan 7, 2010
Messages
965
Reaction score
65
Location
Grain Valley, MO
Bad or dirty mass air flow sensor. Bad Throttle position sensor, or huge vacuum leak are the most likely culprits.
 

soduka

Dedicated LVC Member
Joined
May 19, 2012
Messages
642
Reaction score
38
Location
SD
Take it to Advance or Auto Zone and they'll read the codes for free.

They don't do OBD 1 systems.

As for OP, OBD 1 Ford systems can have their codes extracted for whatever it costs for a paperclip. You jump the EEC-IV connector and then the CEL will flash the codes at you.
 

joeynat

Active LVC Member
Joined
Aug 24, 2010
Messages
152
Reaction score
0
Location
East Brunswick, NJ
For my 1994, I bought the Equus 3145 code reader with the 6 foot extension cable from Amazon. Its a good little code reader it does. koeo, koer, cylinder balance test, and something else i forget. But it works plain and simple.
 

midwest hillbilly

LVC Member
Joined
Mar 14, 2010
Messages
16
Reaction score
0
Location
bloominton
this is what my 94 did with a small crack in spark plug wire tube drove me nuts and replaced alot that i didn't need. problem is you cant see it arching and only did it with a load on the motor. if your wires are old this maybe the problem.
 

greenehoosier

New LVC Member
Joined
Jun 28, 2012
Messages
6
Reaction score
0
Location
Southern Indiana
Thanks for all the replies, guys! Plug wires will be week after next- Spring Break! One of my students says he may have a code reader, if not I will pick one up. It is something simple, I am sure. It runs TOO good to be anything major.... MW Hillbilly- we are neighbors! I live in Bedford. I spent many years in Bloomington, I worked at Royal while I was a student at IU! Good to see another Hoosier on here.
 

greenehoosier

New LVC Member
Joined
Jun 28, 2012
Messages
6
Reaction score
0
Location
Southern Indiana
MWHillbilly- mine is that way too, under load with low rpms. Floor it going downhill and it will SCOOT~!~ Floor it uphill and it falls on its face until you build some RPM's...
 

greenehoosier

New LVC Member
Joined
Jun 28, 2012
Messages
6
Reaction score
0
Location
Southern Indiana
OK, I realized I had a code reader for my 1988 Thunderbird Turbocoupe. The manual says something about EEC-IV, so I am thinking I may have one that will work, if not I may just jump the terminals and see what codes I get from the CEL.
 

Staff online

Members online

Top