'07 XK 4.7L Stalling, Hesitation, misfire. Help - JeepForum.com

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post #1 of 2 Old 04-21-2017, 09:21 AM Thread Starter
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2007 XK Commander 
Join Date: Jun 2009
Location: San Diego
Posts: 49
'07 XK 4.7L Stalling, Hesitation, misfire. Help

I'm having a problem with my '07 4.7L limited. 148k miles. Coughing, sputtering, wild idle and at times it dies and stop lights. After the check engine light comes and i use the remote start, it'll rarely stay running longer than 5-10 secs. After it dies that first time the remote start wont work anymore, it just honks the horn once instead of twice. This mostly happens in and just after being in traffic and it is guarantied to happen if I run the a/c.

stuff I've done to try and fix the issue:
re-flashed the ECM
new OEM spark plugs from Chrysler/Dodge/Jeep
replaced vacuum line on back of intake (had a leak)
replaced the ambient air sensor (like above)(mine looked good, but replaced anyway)

On a trip from San Diego up the mountians to Big Bear (about 3hrs drive time) last month we hit traffic for a few miles and without turning on the a/c it started having idle issues. After we got clear of the stop and go, I could only ease into the throttle a little bit otherwise it'd couch and sputter hard until i let off the gas. I was able to get up to 65-70 mph, but trying accelerate to pass anybody was out of the question. When we got to the mountain's windy road and kept it under 47/50 mph i could accelerate somewhat hard until it hit 50, then it would sputter hard again.

With 148k I understand that there will be things that are ready to be fixed. Do you think it'd be worth it to just replace the Crank position sensor, or should I roll the dice and take it back to the dealer and have them charge me a Boat load and not fix the problem again. I've taken it to them 4 times now. 1st and 2nd time they found nothing wrong with it. 3rd time i had them Flash the ECM...still no change, and the 4th time they fixed the vacuum leak, trany line leak and water pump(these needed to be fixed, but...). All this and it still acts the same. The only thing i do now that is different from then is that i don't run the a/c, but it still happens from time to time. Luckily not as bad and not for very long.

thanks for reading through this.

BigPete is offline  
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post #2 of 2 Old 04-21-2017, 09:08 PM
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Join Date: Mar 2017
Posts: 1
Similar symptoms once with my 1973 Datsun 240Z. Replace the fuel filter.
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