Hey guys iīm Stuardo from Guatemala, i own a 2001 Stang, 3.8 and 6 cylinder engine and manual tranny with 81,XXX miles.. LOL everybody knows about engine specs.
well i have a problem, a tried everything.. when iīm driving at 3,500 rpms my car is OK, but when i want to pass over 4,000 RPM my car stumble, it feels like when a car doesnīt have much gas, few seconds later it passes from 4,000 rpms
y tried this:
- cleaned MAF (i had the 171 code)
- remove catalyc converter
- clean EGR VALVE
- change DPFE sensor
- clean TPS, IAC and throttle body
- it has AUTOLITE DOUBLE PLATINUM SPARKS (they have like 500 miles)
- new spark plug wires
- new fuel filter
- new air filter
- the oil has just 500 miles
i had check engine light on, but yesterday it turns off, i checked the bulb and itīs ok
I would recheck the plugs and wires. Things that are happening has happened to me and it was usually a bad plug or wire/cop.
what did you gap the plugs at?
__________________
1995 Mustang GT-Heavily Modded-Sold 2003 Ford Lightning-Sold 1997 Saleen-5.4 conversion-Sold 2005 Mustang GT-Torch Red-Sold 2003 Mustang Cobra-Oxford White 2003 4Runner V8 Sport Edition 4X4
I would recheck the plugs and wires. Things that are happening has happened to me and it was usually a bad plug or wire/cop.
what did you gap the plugs at?
Could be alot of things, bad O2 sensors, bad fuel pump, bad gas, computer issues/fuel mapping/spark/air...when you removed the catty what replaced it?
__________________
"Goose, Hollywood's fine, I want Viper"
1995 Mustang GT Cnv 347(427 stroker being built!) almost done!
1996 Cobra with Kenne Bell 2.1 Supercharger and every other conceivable part you can bolt on it...650hp upgrade in the works
2003 Infiniti M45 V8 340 hp...a methadone treatment for reformed Mustang drivers
Hey guys iīm Stuardo from Guatemala, i own a 2001 Stang, 3.8 and 6 cylinder engine and manual tranny with 81,XXX miles.. LOL everybody knows about engine specs.
well i have a problem, a tried everything.. when iīm driving at 3,500 rpms my car is OK, but when i want to pass over 4,000 RPM my car stumble, it feels like when a car doesnīt have much gas, few seconds later it passes from 4,000 rpms
y tried this:
- cleaned MAF (i had the 171 code)
- remove catalyc converter
- clean EGR VALVE
- change DPFE sensor
- clean TPS, IAC and throttle body
- it has AUTOLITE DOUBLE PLATINUM SPARKS (they have like 500 miles)
- new spark plug wires
- new fuel filter
- new air filter
- the oil has just 500 miles
i had check engine light on, but yesterday it turns off, i checked the bulb and itīs ok
PLEASE HELP ME... I DONT KNOW WHAT ELSE TO DO...
p0171 is bank1 running lean (LTFT +25%)
since you dont also have a p0174 (bank2 running lean) ; i would start checking for vacuum leaks.
-if the MAF was causing your car to run lean, it would be running lean on both banks.
also, you could doublecheck your ignition system with the engine running by spraying the wires and coil with salty water and look/listen for arcing.
p0171 is your only code? you're sure there are no pending dtc's?
po171 indicates that bank1 is running lean.
it has nothing to do with the ECT or cylinder head temp sensor. if you have a code for one of those, your car has most likely overheated at some point. and it is highly improbable that your pcm is bad.
Mustang 2001 @ 4000 rpms issues 
/
