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Need advice about spark knock #4757222
05/14/18 05:29 PM
05/14/18 05:29 PM
Joined: Aug 2012
Posts: 212
Upstate S.C.
The_Captain Offline OP
The_Captain  Offline OP
Joined: Aug 2012
Posts: 212
Upstate S.C.
Fellow Oil brothers and sisters,

I have a 2017 Jeep Wrangler unlimited. It is equipped with an automatic and 3.21 rear end . The problem is I have spark knock (rattle) when I accelerate or accelerate on hill. It doesn't do it all the time but it happens fairly often. I have tried various fuel treatments and different octane fuels from different top tier stations. It seems to not do it as much when I use 89 or 93 octane. The dealership states they can't recreate the issue. The next time I go in for service I will see if I can get a tech to go along for a ride. It has not thrown any codes. The vehicle has just under 14,000 miles. It has done it the entire time I have owned it. Any thoughts? Guess on what the issue may be? I appreciate any tips or advice. Thanks

Last edited by The_Captain; 05/14/18 05:58 PM.

2017 Jeep Wrangler Unlimited 4x4 with Castrol Full Synthetic (gold bottle) with Fram Ultra oil filter.
Re: Need advice [Re: The_Captain] #4757245
05/14/18 05:46 PM
05/14/18 05:46 PM
Joined: Aug 2015
Posts: 325
TX
KJSmith Offline
KJSmith  Offline
Joined: Aug 2015
Posts: 325
TX
Contact whatever manufacturer that owns them this week and start a file.
They can put monitors on it and see what's happening.

Re: Need advice [Re: The_Captain] #4757265
05/14/18 06:13 PM
05/14/18 06:13 PM
Joined: Sep 2015
Posts: 6,118
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,118
Kalifornia Kollective
It's to new to have manually adjustable timing settings. But my guess is the knock sensor is not right, or the ECU is not seeing the signal, etc.

A little bit now and then is OK, and it indicates that you are running as close to the edge as possible - good for fuel economy. But if it's persistent, that is bad ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Need advice [Re: The_Captain] #4757271
05/14/18 06:17 PM
05/14/18 06:17 PM
Joined: Apr 2008
Posts: 38,247
Ontario, Canada
OVERKILL Online content
OVERKILL  Online Content
Joined: Apr 2008
Posts: 38,247
Ontario, Canada
There may be a PCM update for this to rectify it. There was for the 6.4L in the GC.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: Need advice [Re: The_Captain] #4757291
05/14/18 06:31 PM
05/14/18 06:31 PM
Joined: Feb 2003
Posts: 6,003
Cajun Country, La.
BlueOvalFitter Offline
BlueOvalFitter  Offline
Joined: Feb 2003
Posts: 6,003
Cajun Country, La.
Originally Posted By: The_Captain
Fellow Oil brothers and sisters,

I have a 2017 Jeep Wrangler unlimited. It is equipped with an automatic and 3.21 rear end . The problem is I have spark knock (rattle) when I accelerate or accelerate on hill. It doesn't do it all the time but it happens fairly often. I have tried various fuel treatments and different octane fuels from different top tier stations. It seems to not do it as much when I use 89 or 93 octane. The dealership states they can't recreate the issue. The next time I go in for service I will see if I can get a tech to go along for a ride. It has not thrown any codes. The vehicle has just under 14,000 miles. It has done it the entire time I have owned it. Any thoughts? Guess on what the issue may be? I appreciate any tips or advice. Thanks

WOW, what you described here in your post is exactly what happened to my current truck, in 2008.
I bought my 07 F150 new off of the lot with 6 miles on it. From about 7-8K miles the engine would knock, detonate, ping very heavily upon acceleration, or climbing hills. It sounded like 10 wood peckers on a street light! At 14K miles I brought it to the dealer. They could recreate the problem but couldn't figure out why. Finally, the shop foreman told the tech. to look at the piston crowns with a bore scope. Sure enough, HUGE amounts of carbon on the piston crowns.
They kept my truck for 2 weeks. They provided a rental, FREE of charge. A Ford engineer was called in to figure out what was wrong. The PCV system was allowing copious amounts of oil into the intake manifolds, going directly into the cylinders. The engineer figured it out and all was good. But, the WHOLE top end of my engine had to come apart to clean the piston crowns. They were cleaned with some kind of buffer wheel. The intakes were cleaned in parts tanks. They held up the intakes and oil literally poured out from them!
After physically cleaning everything, the tech. put the top end back together. He hooked up a BG Air Intake Cleaning device to my engine. The tech. then ran a few cans of BG cleaning solution thru the engine until he was satisfied EVERYTHING was clean.
My truck has run fine since. I guess you can say a catch can would have helped in this situation.

Re: Need advice [Re: The_Captain] #4757366
05/14/18 07:31 PM
05/14/18 07:31 PM
Joined: Aug 2010
Posts: 1,193
pa
benjy Offline
benjy  Offline
Joined: Aug 2010
Posts: 1,193
pa
like the girlfriends 08 suby legacy 2.5 + 4 spd auto, it pinged on any grade + got poor MPG's, easy cure was dump it after less than a year. she wanted a subie for a while but that cured her!!! VW jetta 5 cyl 2.5L 6 spd automatic replace it, a good car with great MPG's!!

Last edited by benjy; 05/14/18 07:32 PM.
Re: Need advice [Re: BlueOvalFitter] #4757511
05/15/18 01:50 AM
05/15/18 01:50 AM
Joined: Jan 2018
Posts: 540
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 540
San Antonio, TX
Originally Posted By: BlueOvalFitter
The PCV system was allowing copious amounts of oil into the intake manifolds, going directly into the cylinders. The engineer figured it out and all was good.


I wish we knew what the engineer figured out as being the cause.

Re: Need advice [Re: The_Captain] #4768664
05/26/18 10:18 AM
05/26/18 10:18 AM
Joined: Aug 2012
Posts: 212
Upstate S.C.
The_Captain Offline OP
The_Captain  Offline OP
Joined: Aug 2012
Posts: 212
Upstate S.C.
Any other thoughts or suggestions?


2017 Jeep Wrangler Unlimited 4x4 with Castrol Full Synthetic (gold bottle) with Fram Ultra oil filter.

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