Vengaence
New Member
- Joined
- November 19, 2012
- Messages
- 1
- Reaction score
- 0
- City, State
- Indianapolis, IN
- Year, Model & Trim Level
- 1996 Explorer Sport 4.0
Hello ladies and gents,
I'm new to the forums, thanks in advance for your hospitality and help.
I bought a 96 Explorer Sport 4.0L this may for a song and a dance, and it's been a great vehicle so far. It has 90k miles and runs good otherwise.
The vehicle idles a bit rough pretty consistently, and is a bit worse when cold. It does not stall, and doesn't have problems starting. When the vehicle is fully warmed up, the rough idle is reduced somewhat but is still noticeable. The hot idle is about 900RPM on my scan tool, and drops periodically to about 660RPM then back up to 900, in sync with the cycling of the O2 sensors. When the idle is at the 900RPM part of the cycle, it's fairly smooth, when it dips down to 660-700RPM the engine does not knock or miss but you can feel slight vibration.
The vehicle does have a P0133 and P0153 codes, which can be cleared and do come back but usually take a few days of driving to show up. The O2S11 and O2S21 sensors on the scantool do cycle back and forth between .1 to .9 volts, about every 3 seconds or so (a total period of say 5-6 seconds from .9V to .1V to .9V). The O2 sensors look like they are functioning correctly on the scan tool.
A couple of other notes, gas mileage seems to be normal for this vehicle (16-18mpg city, 24mpg highway so far is what I've seen). The problem doesn't appear to be affecting gas mileage much. Additionally, the vehicle seems to have good power under heavy throttle, with no hesitation. It is completely driveable as is.
A snippet from another site lists the following:
This DTC indicates that response rate is below calibration in HO2S as follows:
DTC P0133 for right front HO2S.
DTC P0153 for left front HO2S.
Possible causes are:
Open or shorted circuit.
Exhaust leak.
Excessive fueling.
HO2S coated with contaminants.
Faulty MAF sensor.
Leak in air induction system.
I checked the air intake box/tube and seems everything is tight there. I havnt checked the vacuum lines yet, and I see from others that intake manifold gasket leaks are very common with these vehicles.
I'm not real excited about digging in for the intake manifold gasket. I was looking for other suggestions to eliminate this problem first.
Let me know what your thoughts are please! Thank you.
Vengaence
I'm new to the forums, thanks in advance for your hospitality and help.
I bought a 96 Explorer Sport 4.0L this may for a song and a dance, and it's been a great vehicle so far. It has 90k miles and runs good otherwise.
The vehicle idles a bit rough pretty consistently, and is a bit worse when cold. It does not stall, and doesn't have problems starting. When the vehicle is fully warmed up, the rough idle is reduced somewhat but is still noticeable. The hot idle is about 900RPM on my scan tool, and drops periodically to about 660RPM then back up to 900, in sync with the cycling of the O2 sensors. When the idle is at the 900RPM part of the cycle, it's fairly smooth, when it dips down to 660-700RPM the engine does not knock or miss but you can feel slight vibration.
The vehicle does have a P0133 and P0153 codes, which can be cleared and do come back but usually take a few days of driving to show up. The O2S11 and O2S21 sensors on the scantool do cycle back and forth between .1 to .9 volts, about every 3 seconds or so (a total period of say 5-6 seconds from .9V to .1V to .9V). The O2 sensors look like they are functioning correctly on the scan tool.
A couple of other notes, gas mileage seems to be normal for this vehicle (16-18mpg city, 24mpg highway so far is what I've seen). The problem doesn't appear to be affecting gas mileage much. Additionally, the vehicle seems to have good power under heavy throttle, with no hesitation. It is completely driveable as is.
A snippet from another site lists the following:
This DTC indicates that response rate is below calibration in HO2S as follows:
DTC P0133 for right front HO2S.
DTC P0153 for left front HO2S.
Possible causes are:
Open or shorted circuit.
Exhaust leak.
Excessive fueling.
HO2S coated with contaminants.
Faulty MAF sensor.
Leak in air induction system.
I checked the air intake box/tube and seems everything is tight there. I havnt checked the vacuum lines yet, and I see from others that intake manifold gasket leaks are very common with these vehicles.
I'm not real excited about digging in for the intake manifold gasket. I was looking for other suggestions to eliminate this problem first.
Let me know what your thoughts are please! Thank you.
Vengaence
