14ersforfun
New Member
- Joined
- February 12, 2010
- Messages
- 1
- Reaction score
- 0
- City, State
- Denver Colorado
- Year, Model & Trim Level
- 2004 Sport Trac
I'll do the best to describe the symtoms and remedies I've tried on my 04 Sport Trac.
It has 103K on it. I had the 100 K service done at about 98 K. Around 100K I noticed very rarely it would stutter when taking off from idle. It is now nearly constant. I have a superchips installed so can get and research the DTC's. Mostly I'm getting: po171 (lean bank1) po174 (lean bank2) and occasionally po300 po304 (missfires), which seem to coincide when I don't baby it through the stuttering.
Based on my internet research the common theme has been MAF sensor, fuel filter, fuel pump, or a vacuum leak.
I put a bottle of Gumout high mileage fuel injector cleaner in a near empty tank, filled the tank and it ran just fine for the first 3/4 of the tank...then the problem returned?
I then removed the MAF and cleaned it with carb cleaner which specifically said safe for electrical parts including MAF sensors....nope.
I bought a new MAF sensor on ebay, installed it. Doesn't present the same area of stuttering off idle, now hesitates mid range and stalls out. Old sensor back on.
Unable to locate exact information on where the fuel filter is. One thread said it was underneath a gaurd....nope. I think I found it but am not sure, in any event it should have been replaced at the 90K service.
stumped....so here I am trying to avoid a costly dealer attempt to repair it. Any help is greatly appreciated.
Mark
It has 103K on it. I had the 100 K service done at about 98 K. Around 100K I noticed very rarely it would stutter when taking off from idle. It is now nearly constant. I have a superchips installed so can get and research the DTC's. Mostly I'm getting: po171 (lean bank1) po174 (lean bank2) and occasionally po300 po304 (missfires), which seem to coincide when I don't baby it through the stuttering.
Based on my internet research the common theme has been MAF sensor, fuel filter, fuel pump, or a vacuum leak.
I put a bottle of Gumout high mileage fuel injector cleaner in a near empty tank, filled the tank and it ran just fine for the first 3/4 of the tank...then the problem returned?
I then removed the MAF and cleaned it with carb cleaner which specifically said safe for electrical parts including MAF sensors....nope.
I bought a new MAF sensor on ebay, installed it. Doesn't present the same area of stuttering off idle, now hesitates mid range and stalls out. Old sensor back on.
Unable to locate exact information on where the fuel filter is. One thread said it was underneath a gaurd....nope. I think I found it but am not sure, in any event it should have been replaced at the 90K service.
stumped....so here I am trying to avoid a costly dealer attempt to repair it. Any help is greatly appreciated.
Mark
