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post #1 of 8 Old 09-15-2020, 09:14 AM Thread Starter
jfinkler08
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Check Engine Light

Hey guys I am new to the jeep world and would like some input on my problem I have with my 5.7 hemi I just bought its got the check engine light on and when I scanned the vehicle it says its a cylinder 7 misfire, any help would be appreciate. We did replace the crank shaft censor check engine light went off and then just came back on yesterday.


Thanks in advanced!!

-JFINKLER

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post #2 of 8 Old 09-15-2020, 09:33 PM
NevadaWheeler
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The P3400 code is probably the cause of the misfire. The multi displacement system didn't function properly and resulted in a misfire during transition. This is usually caused by the wrong viscosity oil.

When I got a P3400 code I also got a misfire code and something else. I got an oil change at the Jeep dealership (cheaper than I could have gotten the oil and filter for) and the problem went away. I didn't even clear the codes before the engine light went off after about 30-40 miles around town.

Brizz


'05 WK 5.7 QDII, stock
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post #3 of 8 Old 09-16-2020, 06:05 AM Thread Starter
jfinkler08
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Thank you I appreciate it my husband did do a oil change a few weeks ago. Yesterday I went to back out of the driveway and it stalled on me...it started right back up but now I’m concerned.

-jfinkler
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post #4 of 8 Old 09-16-2020, 07:23 AM
nvrdone1
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5.7 hemis are very sensitive to using the correct oil. factory recommended is 5/20 full synthetic. i only run Mobil 1 and have had no CEL's for misfire etc. Also they are sensitive to correct spark plugs. Plugs should be NGK lzfr5c-11g with the BLACK TIP. ive only found them at the dealer. Another thing you might try is swapping the coil pack from cylinder 7 to another cylinder and see if the code changes. Also, check the fuel cap. make sure its on tight - 5 clicks. a loose cap can cause a vacuum leak and CEL.
The 5.7 is a great engine but does need proper maintance.
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post #5 of 8 Old 09-16-2020, 07:43 AM Thread Starter
jfinkler08
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thanks yes the oil is correct. Now my scanner is just saying cylinder 7 misfire so I will look over and do what you sugguested. Also Im having vibrations and or a deathwobble at 45-60 it stops when I take my foot off the gas. and also it stalling on me yesterday...must be from the misfire?

-jfinkler
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post #6 of 8 Old 09-16-2020, 10:08 AM Thread Starter
jfinkler08
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This is what its reading now....any suggestions?
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-jfinkler
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post #7 of 8 Old 09-16-2020, 08:08 PM
nvrdone1
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again, id swap the coil from #7 to another cylinder and see if the code changes. also, pull the plugs for a look see.
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post #8 of 8 Old 09-17-2020, 05:50 AM Thread Starter
jfinkler08
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Nvrdone1, thank you. The check engine light went off on my way home yesterday...the misfiring codes still remain..ill check.
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