Engine troubles! Flashing CEL. P0301 p0171 p0174
06-23-18, 11:24 AM
#1
Driver School Candidate
Thread Starter
Engine troubles! Flashing CEL. P0301 p0171 p0174
So I was driving home from school and my check engine light came on along with the vsc lights. As I was exiting the freeway I noticed my car misfiring and running very rough with a deep Rumble sound. Went to autozone, and their scanner showed p0171, p0174, and p0301. I cleaned the maf sensor and had the battery unplugged for an hour, didnt help. Not sure what to do, looking for a job and can not be carless! Any feedback much appreciated
Edit: cel was flashing when lights came on and started flashing right away after cleaning the sensor
Edit: cel was flashing when lights came on and started flashing right away after cleaning the sensor
Last edited by sexusc430; 06-23-18 at 11:26 AM. Reason: Missing info
06-23-18, 12:31 PM
#3
Driver School Candidate
Thread Starter
i checked just with my eyes and have replaced one of them before, there is sludge around the sparkplugs all over the place, should i check for sludge where the plugs are on the inside?
06-23-18, 12:48 PM
#4
Lexus Test Driver
I found these threads...take some time to read them...
https://www.clublexus.com/forums/sc4...n-highway.html
Vacuum leaks
https://www.clublexus.com/forums/sc4...r-problem.html
this might be the best thread with a solution...let us know what happens.
https://www.clublexus.com/forums/sc4...ot-steady.html
https://www.clublexus.com/forums/sc4...n-highway.html
Vacuum leaks
https://www.clublexus.com/forums/sc4...r-problem.html
this might be the best thread with a solution...let us know what happens.
https://www.clublexus.com/forums/sc4...ot-steady.html
Last edited by Bgw70; 06-23-18 at 07:03 PM.
06-23-18, 05:32 PM
#5
Driver School Candidate
Thread Starter
I found these threads...you might add eehe too.
https://www.clublexus.com/forums/sc4...n-highway.html
Vacuum leaks
https://www.clublexus.com/forums/sc4...r-problem.html
this might be the best thread with a solution...let us know what happens.
https://www.clublexus.com/forums/sc4...ot-steady.html
https://www.clublexus.com/forums/sc4...n-highway.html
Vacuum leaks
https://www.clublexus.com/forums/sc4...r-problem.html
this might be the best thread with a solution...let us know what happens.
https://www.clublexus.com/forums/sc4...ot-steady.html
06-23-18, 07:02 PM
#6
Lexus Test Driver
06-23-18, 08:23 PM
#7
Best post today! 
Certainly agree that vacuum hose connections are the place to start. That jibes with sudden failure as the OP indicates.
However, the sludge around the spark plugs is certainly an interesting clue, assuming its related.
My money is on MAF sensor.
Certainly agree that vacuum hose connections are the place to start. That jibes with sudden failure as the OP indicates.
However, the sludge around the spark plugs is certainly an interesting clue, assuming its related.
My money is on MAF sensor.
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06-23-18, 08:40 PM
#8
Driver School Candidate
Thread Starter
So i noticed the coil being brown and nasty on cylinder 1 and the coil on cylinder 3 was clean, so I switch them around and went to AutoZone to get the code checked and the code came up for cylinder 3 misfire, so I bought a new ignition coil put it in and it's running like new again! Thanks for all the input
06-23-18, 10:15 PM
#9
Pole Position
Good for you. Now go and enjoy your SC.
06-24-18, 03:33 AM
#11
Lexus Test Driver
So i noticed the coil being brown and nasty on cylinder 1 and the coil on cylinder 3 was clean, so I switch them around and went to AutoZone to get the code checked and the code came up for cylinder 3 misfire, so I bought a new ignition coil put it in and it's running like new again! Thanks for all the input
Look for visual abnormalities
When possible, always use a known good part to test with
then execute your theory!
bravo and so glad it’s fixed!!!
06-24-18, 12:53 PM
#12
Driver School Candidate
Thread Starter
06-24-18, 04:23 PM
#13
Lead Lap
Good job tracking that down and diagnosing it. Glad that you got it up and running again.
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