2001 Jeep Cherokee Evaporative Emission Controls
05-03-2018, 09:45 AM
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Model: Cherokee
2001 Jeep Cherokee Evaporative Emission Controls
My 2001 Jeep Cherokee gives a code P0456, stating a "very small leak". I am going crazy trying to find this very small leak. Any suggestion? In 10 days I am due for emission inspection. Thank you.
05-03-2018, 10:38 AM
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Year: 1997
Model: Cherokee
Engine: 4.0L
Gas caps can look ok, but not seal 100%. Doublecheck that. Try a new one if you like, they arent that expensive. Have you gone over every vacuum line? Rubber connections? Give the rubber a squeeze. If you see cracking, replace. Another option is a smoke machine. Or you could reset the CEL and see if it comes back. Sometimes it will. Sometimes it wont.
05-04-2018, 03:58 AM
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Year: 2001
Model: Cherokee (XJ)
Engine: 4.0L
I used small clamps on all the hoses on the evap system and at the charcoal canister and it fixed that code I had over a year ago . I didn't have to tighten to tight just put them on snug .
05-12-2018, 09:38 AM
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Hi tech:
I followed your suggestion and clamped all hoses in the evaporative system. I reset the computer and done about 10 trips but the code still did not clear. How long does it take?
I followed your suggestion and clamped all hoses in the evaporative system. I reset the computer and done about 10 trips but the code still did not clear. How long does it take?
05-12-2018, 12:28 PM
#7
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Did it clear after you reset the computer? If not might disconnect the battery for around a minute. if it did then these other fine people are on the hurt and I'm just on the sidelines cheering on!
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05-16-2018, 09:47 PM
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Model: Cherokee
Hi tech:
I placed clamps on all hoses I could reach. I am running that idiotic Chrysler protocol to set the code for the emission system. I have done more that half of dozen cold starts, idle warm ups and driving various distances with different speeds, but I can't get the computer to clear the code. By the way the engine light is OFF. Today I also drove the jeep for over 70 mile with highway speeds of 65 to 70 MPH, still no results. I do not know how Chrysler does it!
In the mean time I put together a smoke tester for less than $20. If that darn light comes on I will smoke the system, but I hope it does not come to that.
I placed clamps on all hoses I could reach. I am running that idiotic Chrysler protocol to set the code for the emission system. I have done more that half of dozen cold starts, idle warm ups and driving various distances with different speeds, but I can't get the computer to clear the code. By the way the engine light is OFF. Today I also drove the jeep for over 70 mile with highway speeds of 65 to 70 MPH, still no results. I do not know how Chrysler does it!
In the mean time I put together a smoke tester for less than $20. If that darn light comes on I will smoke the system, but I hope it does not come to that.
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