03 explorer idle problems
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Tuned
Joined: Apr 2006
Posts: 331
Likes: 4
From: grorgetown,in
03 explorer idle problems
i have an 03 explorer with 180k miles on it. the engine has a miss in it at idle and driving down the road. when taking off the engine bogs until it get to about 2500rpm then it will go. codes are p0300,p0304,305,306 and po316. i changed plugs,wires, and coil pack. no change. drained gas out and put new in. no change. compression is good on the three cylinders. any ideas what to try next? any help would be great.
Logistics Pro
Joined: Jun 2009
Posts: 4,818
Likes: 83
From: Cedar Rapids, IA
Sounds like you may have a Camshaft Position (CMP) sensor that is not working correctly, or the CMP sensor synchronizer (not sure if that's used on your engine or not). Does your Explorer have the V6 or V8?
-Rod
-Rod
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
If you have a V6 all those codes indicate misfire on #2 bank (driver side), may not be an ignition issue... check the plugs for rich/lean burn.. plug a scanner in and see what the O2 is doing..... Philip
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Tuned
Joined: Apr 2006
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From: grorgetown,in
can the o2 make it run silly like that?
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
Why else would I direct you to check it!.... if it is not working properly or seeing bad data it could command the CPM to turn the injectors on (rich) or off (Lean)
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Tuned
Joined: Apr 2006
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From: grorgetown,in
just found out from friend that o2 sensor was changed about 200 miles ago but said right before she brought it to me it had a0153 code for drivers upstream sensor. i guess i will get her to change it on warranty if its bad. wish i knew this earlier. will let you know what i find. and it is a v6
Logistics Pro
Joined: Jun 2009
Posts: 4,818
Likes: 83
From: Cedar Rapids, IA
According to the factory service manual, the likely causes for the P0300 random misfire code are:
For the P030x codes, they indicate misfires on each of the bank 2 cylinders as mentioned above. The possible causes for these codes are:
And finally, for the P0316 code indicating the misfire occurred in the first 1000 engine revolutions:
As you can see, there are some possible causes that are common to all three types of codes. I'd start there. It sure would help to have access to a scan tool with datastream mode so you could look at the fuel trim values as well to get a feel for if this is a lean misfire (suggesting a vacuum leak, EGR issue, low fuel pressure) or a rich misfire (suggesting lack of spark, high fuel pressure, leaking fuel injector).
-Rod
- Camshaft Position Sensor
- Low fuel (less than 1/8 tank)
- Stuck open EGR valve
- Blocked EGR passages
For the P030x codes, they indicate misfires on each of the bank 2 cylinders as mentioned above. The possible causes for these codes are:
- Ignition system
- Fuel injectors
- Running out of fuel
- EVAP canister purge valve
- Fuel pressure
- Evaporative emission system
- Base engine
And finally, for the P0316 code indicating the misfire occurred in the first 1000 engine revolutions:
- Damaged CKP sensor
- Ignition system
- Fuel injectors
- Running out of fuel
- Fuel quality
- Base engine
- Damaged PCM
As you can see, there are some possible causes that are common to all three types of codes. I'd start there. It sure would help to have access to a scan tool with datastream mode so you could look at the fuel trim values as well to get a feel for if this is a lean misfire (suggesting a vacuum leak, EGR issue, low fuel pressure) or a rich misfire (suggesting lack of spark, high fuel pressure, leaking fuel injector).
-Rod
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Tuned
Joined: Apr 2006
Posts: 331
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From: grorgetown,in
well i'll be. i changed the driver side upstream 02 sensor and it fixed the problems. thanks everyone for the help.another question is what would cause it to be eating 02 sensor on that side? that is the third one in about 700 miles. im thinking it has something to do with the cat. on that side cause every now and then i hear stuff rattleing around in it when truck is running. It is always fun working on stuff when they dont tell you all the details up front.
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Tuned
Joined: Apr 2006
Posts: 331
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From: grorgetown,in
i did but not sure if i was looking at the right thing. i was comparing or i think i was to the other side and it wasnt the same .one of them was .02v and the other was llike .78. does that make any sense? lol. got the scanner to look at it just not real sure what to look for or what setting.
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
i did but not sure if i was looking at the right thing. i was comparing or i think i was to the other side and it wasnt the same .one of them was .02v and the other was llike .78. does that make any sense? lol. got the scanner to look at it just not real sure what to look for or what setting.
One other reading you should be concerned with is the LTFT (long term fuel trim), should read close to 0 (zero) at idle and at 2000rpm, it will slowly rise or fall +/- 2-3% if everything is OK. Higher values require investigation...
The other readings that most people miss is the CL (closed loop) indication and the engine temp >180* .. at 2000rpm in driveway....no movement...... Philip
Cargo Master
Joined: Aug 2003
Posts: 3,263
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From: BC Canada
BTW, the CAT would have no bearing on the longevity or readings of the upstream O2 sensors...
If you see reading that starts to fluctuate on the downstream (after CAT) O2 (Should stay fairly stable mid range), that would indicate a pending problem with the CAT..... Philip
If you see reading that starts to fluctuate on the downstream (after CAT) O2 (Should stay fairly stable mid range), that would indicate a pending problem with the CAT..... Philip
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