1993 Ranger 4.0 V6 with hesitation until full throttle
#1
1993 Ranger 4.0 V6 with hesitation until full throttle
I have a 93 ranger 4.0 and I am having problems with hesitation during acceleration. The truck idles fine, but when i start to accelerate, it will hesitate until I goose the throttle all the way and then it takes off and starts running great. I have recently changed the plugs, wires, fuel filter, pcv valve and air filter. Someone has suggested to me it could be a loose wire at the battery, coil packs, egr valve, or a dirty MAF sensor... Does anyone have any advice for me?
Thanks
Thanks
#2
May be the MAF, have you been running an oiled filter? May also be an O2 sensor, the ECT (engine coolant temp sensor) or a bad TPS (throttle position sensor).
Not the news your wanting to hear but my friends truck did the same thing (94 4.0 ranger 5speed) and we replaced and thought of everything we thought it could be. We ended up running out of ideas and had to replace the engine. The new one runs fine but it bothers me we didn't figure out what the problem was.
Not the news your wanting to hear but my friends truck did the same thing (94 4.0 ranger 5speed) and we replaced and thought of everything we thought it could be. We ended up running out of ideas and had to replace the engine. The new one runs fine but it bothers me we didn't figure out what the problem was.
#3
its is the maf clean it really good and see if it helps. if not replace it. i replaced a whole ton of **** on my truck too and i had a check engine light. unplug your maf and drive it and see if it is any different my truck wasnt any differnt so i know it was the maf. do you have a check engine light or does it come on and go off?
#4
#5
#6
Blake, the easiest way to fix it would be to read the codes.
Even though the CEL isn't on all the time, there'll still be
codes present. The code will tell which direction to look.
(Most auto parts stores will read the codes for free, in hopes
you'll buy the needed parts from them.)
As to the TPS, it has 3 wires, and the middle wire is the ground.
One of the outside wires is the reference voltage which is 5v.
The other wire is the signal wire, which will vary from about 1v to
about 5v as the throttle is advanced.
I can't tell you which outside wire is which, but you can backprobe
each one with a voltmeter and find the one with 5 v (with key on).
That's the reference voltage wire, and the other outside wire will be
the signal wire, and should have about 1 v on it with the throttle closed.
(A common straight pin is good to stick into the wire for a backprobe)
You are looking for a smooth transition from 1 to 5 v on the signal
wire when the throttle is advanced. If the voltage is erratic, then the
TPS is bad. It's easier to see this with an analog voltmeter if you
have one.
Good luck,
ROE
Even though the CEL isn't on all the time, there'll still be
codes present. The code will tell which direction to look.
(Most auto parts stores will read the codes for free, in hopes
you'll buy the needed parts from them.)
As to the TPS, it has 3 wires, and the middle wire is the ground.
One of the outside wires is the reference voltage which is 5v.
The other wire is the signal wire, which will vary from about 1v to
about 5v as the throttle is advanced.
I can't tell you which outside wire is which, but you can backprobe
each one with a voltmeter and find the one with 5 v (with key on).
That's the reference voltage wire, and the other outside wire will be
the signal wire, and should have about 1 v on it with the throttle closed.
(A common straight pin is good to stick into the wire for a backprobe)
You are looking for a smooth transition from 1 to 5 v on the signal
wire when the throttle is advanced. If the voltage is erratic, then the
TPS is bad. It's easier to see this with an analog voltmeter if you
have one.
Good luck,
ROE
Thread
Thread Starter
Forum
Replies
Last Post
Fumey
SOHC - 2.3L & 2.5L Lima Engines
5
10-10-2014 04:06 PM
BuckGodot
2.9L & 3.0L V6 Tech
1
02-17-2012 04:16 AM
BlakeryBob03
4.0L OHV & SOHC V6 Tech
1
08-06-2009 10:21 AM