Jump to content
  • Welcome To Mopar1973Man.Com

    We can see that your guest and been lurking about. When you register on the Mopar1973Man.Com site you'll be able to interact with all the other members. This is the most friendliest Cummins forum you'll ever join. Take the time right now and  REGISTER  on the Mopar1973Man.Com this will open up many more options and functions on the website. Everyone is very friendly and helpful just ask questions and everyone will help you out the best they can. 

Collinst15

Fuel knock or timing knock or something else?

Recommended Posts

Good afternoon everyone,

 

This past week my vehicle situation has changed and I have been driving my 99 daily.  Since I have not driven it much this winter in the cold I don't think it sounds right.  I can hear a knock or a rattle noise when driving it and think it is either a fuel knock or timing knock and hopefully not something else.  The noise does not increase with rpms, but it is there. I believe the injectors are stock with 174k miles and the truck has a Quadzilla XZT+ chip.  Both videos were taken with the chip in the "timing" setting.  I have turned the chip to the off setting,  the noise is there but faint.  I have included a couple video clips, what do you guys think?
https://www.facebook.com/510913837/videos/10157061274603838/?l=8449699577610092840
https://www.facebook.com/510913837/videos/10157061269128838/?l=5694756621128741884
 

Share this post


Link to post
Share on other sites

the motor just sounds different to me since Ive been driving it this week.  It is a daily driver during summer but I try to park it in the winter due to NYS salt roads.  I don't remember it sound like it does during the summer.

 

Tim

Share this post


Link to post
Share on other sites

Thanks Mike.  I figured my injectors are shot.  currently saving the money to have DAP build me a set.   

 

Tim

@mopar1973man - does the MX obdlink allow you to look at engine timing??

Edited by Collinst15

Share this post


Link to post
Share on other sites
2 hours ago, Collinst15 said:

does the MX obdlink allow you to look at engine timing??

 

No. The only thing right now on the market that does is the Quadzilla. You don't see actual timing but commanded timing. If your VP44 is damaged and throwing the P0216 code it still shows the commanded timing but actual could be way off. 

 

OBDLink LX or MX series only shows OBDII PIDs. Nothing more. 

https://en.wikipedia.org/wiki/OBD-II_PIDs

 

There is a way to show all the available data on the Cummins but sad to say the Hex 1C bit that shows what kind of system this reports back 05 which is "Non-OBDII Compliant" So the rules don't hold true for our trucks.

 

Between the Quadzilla and OBDLink tool you can get all the data you need.

Share this post


Link to post
Share on other sites

I would pull your fan belt off and try it. The belt tensioner can knock when they get bad.

Share this post


Link to post
Share on other sites

Thanks for the heads-up on the video.  See below for updated videos.  I have uploaded them to youtube.  Let me know your thoughts everyone.  I hope to purchase new injectors before the end of march from DAP.

 

 

Tim

Share this post


Link to post
Share on other sites

Hey guys, I noticed this morning after trying to start my truck for 10 minutes and eventually white smoking the pasture, that it sounds like a powerstroke 😳..... It has hardly no guts if I unplug my adrenaline, and it hardly runs better with it connected. I haven't made any crazy timing adjustments, I've taken several datalogs, but maybe I'm missing something...... Oh yeah., I was driving down the road last Monday and all the sudden I felt the power leave the skinny pedal, i can floor it and it'll take roughly 10-15 seconds to pick back up but when it does boy it's a rocket,ever since then it's done it randomly at the WORST times possible..... Someone please tell me my VP didn't just take a big healthy steaming poo on me 😰 

Share this post


Link to post
Share on other sites
On 2/28/2019 at 6:27 AM, Mopar1973Man said:

I'm going to stick with my original post. I'm going to still say it's injectors. 

Mike you know iv been complaining of similar issues lately? This is almost exactly what my truck sounds like. 

Share this post


Link to post
Share on other sites

Just a little update.  Truck has been running fine with what I call a fuel knock.  it still sounds like above on colder days, but I hope to fix that in next few weeks.  I ordered a set of 100hp injectors from DAP and am rebuilding my hx35.  I took the XZT+ off and am saving for an Adrenaline.  Ultimate goal for truck is a reliable daily driver.  Not looking for crazy power, but want some power when I want/need it.  

 

Marcus - ill let you know how my truck runs once I install injectors.

 

Tim

  • Thanks 1

Share this post


Link to post
Share on other sites

I noticed this winter that my truck sounds louder too.  This is my first winter with it so I'm not sure if its normal to change in the winter or not.  I posted on here about it. 

 

I know I need injectors too.  165k miles on original injectors.  I need to call DAP and figure out what size I can go with with my HX35 turbo.

Share this post


Link to post
Share on other sites
Posted (edited)
9 hours ago, hdpwipmonkey said:

I need to call DAP and figure out what size I can go with with my HX35 turbo

If you got v2tuning I'd say go with 7x10 vco set at 320bar

Edited by Dieselfuture
  • Like 3

Share this post


Link to post
Share on other sites
Posted (edited)

7 x 0.010 @320 bar works good so far. Still needs more beta test with others. This is not absolute bet yet. For me no issues to report.

Edited by Mopar1973Man

Share this post


Link to post
Share on other sites

Well today is a good day.  Got my 100hp injectors in the mail from DAP and found a Quadzilla Adrenaline local for sale.  I've flashed it with the most recent v2.7 tune from here.  Will be a few weeks until I can install everything but looking forward to seeing how truck runs.

 

Tim

20190329_122932.jpg

  • Like 4

Share this post


Link to post
Share on other sites

@Mopar1973Man what do you use to see engine load on the obdlink? I have an obelisk MX and I only saw corrected load value and absolute load value.  The absolute load value reads 0.0% all the time and the corrected load value I've seen 100% with 1/4 throttle last night.  Just wondering what pid/gauge you are using on your obdlink.

 

Tim

Share this post


Link to post
Share on other sites
Posted (edited)
42 minutes ago, Collinst15 said:

I have an obelisk MX and I only saw corrected load value and absolute load value. 

Just like you got it. The corrected engine load is fine. 

 

42 minutes ago, Collinst15 said:

the corrected load value I've seen 100% with 1/4 throttle last night. 

That means it took 100% fuel to get you rolling at a mere 25% throttle. Drag?

 

Edited by Mopar1973Man

Share this post


Link to post
Share on other sites

Wow.  I know I possibly have a rear drum dragging, but wouldn't this also suggest injectors are not working 100% and are well below pop pressure? I gotta find a free weekend hopefully before May to change everything. 

 

Thanks,

 

Tim

Share this post


Link to post
Share on other sites

Well here is a picture of the rpm from the obdlink.  The calculated load value is all over the place at idle from 0% to 6%, but rpm is solid at 842rpms.

 

Tim

Screenshot_20190406-123028.jpg

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.




×
×
  • Create New...