Jeep Wrangler Forum banner
  • Hey everyone! Enter your ride HERE to be a part of September's Ride of the Month Challenge!
1 - 20 of 24 Posts

·
Registered
Joined
·
801 Posts
Discussion Starter · #1 ·
My 2012 has always ticked like a wind-up chimpanzee with those little cymbals but I haven't experienced any loss of power and the only time it's thrown a code was something transmission related that occurred around 3k.

But starting around 6500 miles the engine began pinging / detonating more and more to the point where nearly every part throttle acceleration now sounds like the little chimps in the motor with the cymbals have added some tap shoes and are learning to clog.

Even when all that pinging is going on I don't seem to have a power problem and if I put my foot to the floor to get it to downshift it mostly goes away. It's not loud enough to hear when the windows are down or the music is up but as the temps have cooled and the windows are up most days, if I drive without the music it makes me nuts.

I have a little over 10k now and I got to thinking that maybe it's a sensor that has gone out of calibration. So I disconnected the battery for 20 minutes to hopefully reset the computer and then drove it about 45 miles today on three separate around town trips. It pinged a little but as I drove (and hopefully the computer re-learned) it seemed to be pinging far less than normal.

I have my fingers crossed that it was simply a sensor out of calibration and that as the computer goes through its re-learn cycle it will sense the knock and richen up the mixture a bit.

Probably just wishful thinking... I need to turn the radio up. :whistling:
 

·
Registered
Joined
·
3,392 Posts
My 2012 has always ticked like a wind-up chimpanzee with those little cymbals but I haven't experienced any loss of power and the only time it's thrown a code was something transmission related that occurred around 3k.

But starting around 6500 miles the engine began pinging / detonating more and more to the point where nearly every part throttle acceleration now sounds like the little chimps in the motor with the cymbals have added some tap shoes and are learning to clog.

Even when all that pinging is going on I don't seem to have a power problem and if I put my foot to the floor to get it to downshift it mostly goes away. It's not loud enough to hear when the windows are down or the music is up but as the temps have cooled and the windows are up most days, if I drive without the music it makes me nuts.

I have a little over 10k now and I got to thinking that maybe it's a sensor that has gone out of calibration. So I disconnected the battery for 20 minutes to hopefully reset the computer and then drove it about 45 miles today on three separate around town trips. It pinged a little but as I drove (and hopefully the computer re-learned) it seemed to be pinging far less than normal.

I have my fingers crossed that it was simply a sensor out of calibration and that as the computer goes through its re-learn cycle it will sense the knock and richen up the mixture a bit.

Probably just wishful thinking... I need to turn the radio up. :whistling:
you're aware of the cylinder head problems that cause ticking right? sounds like you need a new head.
 

·
Registered
Joined
·
801 Posts
Discussion Starter · #3 ·
you're aware of the cylinder head problems that cause ticking right? sounds like you need a new head.
Yep but my understanding is that it has to throw misfire codes before they will do anything. I haven't read that the pinging is related... although I admit I stopped reading the Ticking Pentastar thread about 12,000 posts ago.
 

·
Registered
Joined
·
92 Posts
i have the same and the little rattle seems to be pinging. my dealer did not want to do anything about it. at least try it .
 

·
Registered
Joined
·
182 Posts
I have a very similar pinging under part throttle in my 2012. It's worse in warm weather. No ticking noise at all, just pinging driving up steep hills at part throttle.

I put in a tankful of 91 octane and the pinging totally disappears. I can drive one higher gear up the same hills. The OP should try a tank as an experiment. I've been following threads on most of the Wrangler forums to try to find out whether there might be a reflash but don't think so. It might be a precursor to the full blown head failure, especisally since the Chrysler guy said "fuel quality" had something to do with the head problem but I don't really know.
 

·
Registered
Joined
·
801 Posts
Discussion Starter · #6 ·
I have a very similar pinging under part throttle in my 2012. It's worse in warm weather. No ticking noise at all, just pinging driving up steep hills at part throttle.

I put in a tankful of 91 octane and the pinging totally disappears. I can drive one higher gear up the same hills. The OP should try a tank as an experiment. I've been following threads on most of the Wrangler forums to try to find out whether there might be a reflash but don't think so. It might be a precursor to the full blown head failure, especisally since the Chrysler guy said "fuel quality" had something to do with the head problem but I don't really know.
No pinging again today after the computer reset but if it comes back I'll let it ping away until the head goes and have Chry$ler replace it on their dime rather than spend my money on more expensive fuel.

I had a Ford Powerstroke diesel years back and it was in and out of the shop a few time for warranty engine work. That was an interesting vehicle to work on... they would take the body off the frame to work on the motor (quite a sight). It had a couple common failure modes, blown EGR cooler and cracked Y-Pipe and it experienced them both in the first 80k miles of ownership. The second happened slightly after it was out of warranty (past 5 year mark) and Ford still fixed it because it was a common problem. It also came with a crimped main bearing seal from the factory and was dripping oil in my driveway from day one. But when it was running man could it tow a camper and belch black soot :)
 

·
Registered
Joined
·
26,921 Posts
I have a very similar pinging under part throttle in my 2012. It's worse in warm weather. No ticking noise at all, just pinging driving up steep hills at part throttle.

I put in a tankful of 91 octane and the pinging totally disappears. I can drive one higher gear up the same hills. The OP should try a tank as an experiment. I've been following threads on most of the Wrangler forums to try to find out whether there might be a reflash but don't think so. It might be a precursor to the full blown head failure, especisally since the Chrysler guy said "fuel quality" had something to do with the head problem but I don't really know.
Same experience except I used mid grade gasoline.
 

·
Registered
Joined
·
182 Posts
I tried mid grade during the summer and it didn't make much difference. The Jeep drives so much nicer when it's not pinging that I'm willing to pay the difference, especially when gas is sort of cheap anyway.

What I'd really like so see is some kind of reflash. A head failure would actually be my best outcome because it would result in a real long term fix.
 

·
Registered
Joined
·
801 Posts
Discussion Starter · #10 ·
Day 2 after the ECU reset and still little to no ping compared to before the reset. However my average fuel mileage readings have dropped more than 1 mpg from previously driving the same commute so the engine is running richer or the hoped for sensor re-calibration is affecting the MPG calculation.

I'd be interested in other people's experience with an ECU reset on their ping issues. I think the battery has to be disconnected for at least 10 minutes (I did 20 minutes to be on the safe side).

Note that you will lose you radio presets. Also don't do this if you are just about to have emissions inspection performed because it will reset the OBD readout and say "Not Ready" for some period of days, or restarts after the reset. I'm sure there is info somewhere on the forum as to how many restarts or time elapsed must pass before OBD shows ready for an emissions report.
 

·
Registered
Joined
·
26,921 Posts
I have had my battery disconnected several times and didn't lose radio presets. Had to reset time is all.
 

·
Registered
Joined
·
26,921 Posts
I lost my all my radio presets (Terrestrial and Satellite) . I have the base model radio with Sirius and a single CD player.
Strange, I have the base radio (130) and single CD player too.
 

·
Registered
Joined
·
801 Posts
Discussion Starter · #15 ·
usually you dont have to wait 10 mintues....most cars are like a min or so...at least thats been my experience....better to know than to think though.
Well I just Googled and on Quadratec's website they say disconnect for 30 seconds and then it takes 50 warm up periods to re-learn. They also recommend grounding the positive cable to the negative (after removing the positive from the post) to drain the charge so maybe if you simply disconnect it takes much longer to discharge.

Those who "know" sometimes don't "think" and sometimes those who "think they know" don't really "know" and some who "know they don't know" say that they "think".

YMMV
 

·
Registered
Joined
·
801 Posts
Discussion Starter · #16 ·
Strange, I have the base radio (130) and single CD player too.
I see you have a 2011. Maybe the 2012 Pentatick CAN bus is different. I've had my battery disconnected twice for extended periods of time. Once right after I bought my Jeep and was installing a HAM radio and again this past Saturday to try and make it forget it's "driving style programming". Both times it lost all the presets.

When I owned a Dodge Challenger the recommendation after a PCM reset was to drive it like you stole it, but that was a bit more fun in a Hemi powered Challenger than my minivan powered Jeep.
 

·
Registered
Joined
·
26,921 Posts
I had a 2011, now have a 2012. Have disconnected battery on 2012 several times. Once for a few hours when I had to remove the battery tray to get to the top of the shock. Strikes me as odd that you lose your presets.
 

·
Registered
Joined
·
26,921 Posts
That's just it, I don't lose presets, they stay stored in the radios memory. ThingsAbove does lose his.
 

·
Registered
Joined
·
182 Posts
I don't think the battery disconnect method is going to be a permanent fix. AFAIK the ECU is adaptive all the time. It might take a while but it's going to adjust the tuning until it reaches the goal it's looking for. Pretty sure it will go back to where it was before eventually. I'll be monitoring this thread. I hope it works since it's so easy to do.

I think the ECU actually resets partially after each fill-up. Say you bought some bad gas or the wrong grade of gas. The ECU would hear the pinging and reset timing. Then you go back to good gas. The ECU needs to understand it should attempt the more aggressive timing, otherwise it would go through the rest of the vehicle's life with an incorrect timing map. So some ECUs (don't know specifically about Chrysler) detects the fill up and try to go back to standard timing.

Now it might be the case that a head that has partially failed but hasn't gone bad so much that it's set the CEL could be sending unusual exhaust gas mixtures down the exhaust pipe. The O2 sensor might see a gas reading that's not right and give the ECU an inappropriate feedback signal leading to a wrong fuel/air mixture. If the mixture is too lean it could lead to overheating in the combustion chamber and/or pinging.

These are just guesses. I'm no expert.
 
1 - 20 of 24 Posts
Top