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Intermittent sputtering, major loss of power (No CEL)

Lsxtrucker

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Lsxtrucker Enthusiast

Lsxtrucker

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4 minutes ago, riverbanks said:

Cats are hot, burning of unburnt fuel, from a incorrect air/fuel ratio,got to check that pressure

Can I just have them removed as I was planning on doing exhaust soon anyways? No emissions here. 

riverbanks Senior Enthusiast

riverbanks

Posted
Posted

That looks like a good tester,got all the fittings for other vehicles without test port,and try to keep the cats,good for all of us,and you will get codes without them

Lsxtrucker Enthusiast

Lsxtrucker

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35 minutes ago, riverbanks said:

That looks like a good tester,got all the fittings for other vehicles without test port,and try to keep the cats,good for all of us,and you will get codes without them

I picked up this one locally. Will report back here with results. What should the psi be at the rails? 

Screenshot_20200212-095653.png

Lsxtrucker Enthusiast

Lsxtrucker

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4 hours ago, riverbanks said:

That looks like a good tester,got all the fittings for other vehicles without test port,and try to keep the cats,good for all of us,and you will get codes without them

I picked up this one locally. Will report back here with results. What should the psi be at the rails? 

 

3 hours ago, riverbanks said:

High 50's at idle

It read 48 PSI at idle. 

swathdiver Senior Enthusiast

swathdiver

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On 2/12/2020 at 2:17 PM, Lsxtrucker said:

It read 48 PSI at idle. 

Is that a FlexFuel motor?  Vin code Z, the L59?

 

I was seeing if you were close to me but we're 4 hours or so apart.  I would check the crank, camshaft and throttle position sensors with a scan tool.  If you still have that fuel pressure gauge, can you rig it so you can see pressure while you are driving?  Back in the day, we'd snake it outside the hood and let a wiper blade hold it down while we got on it to check pressure at speed.

Lsxtrucker Enthusiast

Lsxtrucker

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24 minutes ago, swathdiver said:

Is that a FlexFuel motor?  Vin code Z, the L59?

 

I was seeing if you were close to me but we're 4 hours or so apart.  I would check the crank, camshaft and throttle position sensors with a scan tool.  If you still have that fuel pressure gauge, can you rig it so you can see pressure while you are driving?  Back in the day, we'd snake it outside the hood and let a wiper blade hold it down while we got on it to check pressure at speed.

Its a VIN code V. If it helps I did have it scanned with a very expensive scan tool (Snap On) at my mechanics shop with no indication of a problem. I'm ordering a temp gauge to test pre and post cat temps. Thanks

swathdiver Senior Enthusiast

swathdiver

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1 hour ago, Lsxtrucker said:

Its a VIN code V. If it helps I did have it scanned with a very expensive scan tool (Snap On) at my mechanics shop with no indication of a problem. I'm ordering a temp gauge to test pre and post cat temps. Thanks

Ok.  With the Snap-On tool they could also run graphs and record data and run certain tests which should have exposed the problem if they spent the time.  It's near impossible to work on these trucks without a good scan tool.

 

If you are just in testing phase and doing basics, you can get a little wireless adapter that talks to your phone and you can watch cat temps, graph their movements, fuel pressure, etc.  Scotty Kilmer on youtube yesterday did a video about a really good basic scan tool for $35.

Lsxtrucker Enthusiast

Lsxtrucker

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Would you mind linking me to the video you speak of. My mechanic did scan the truck with a $2k tool. Overpriced intercooler found something he would have. But he didn't. His only recommendation was to keep an eye on it as the CEL has been out now for a couple days and counting. I had one bad plug wire out of the art that I installed so I replaced that. There's still a loss of power but it's not very pronounced. I'm doing little by little because if I'm not careful I'll spend Every thing I have on my truck. 

swathdiver Senior Enthusiast

swathdiver

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59 minutes ago, Lsxtrucker said:

Would you mind linking me to the video you speak of. My mechanic did scan the truck with a $2k tool. Overpriced intercooler found something he would have. But he didn't. His only recommendation was to keep an eye on it as the CEL has been out now for a couple days and counting. I had one bad plug wire out of the art that I installed so I replaced that. There's still a loss of power but it's not very pronounced. I'm doing little by little because if I'm not careful I'll spend Every thing I have on my truck. 

 

Scotty is a good salesman, they sold out of them.  But you get the idea.  You can buy a $15 OBDII Bluetooth or WIFI adapter and use Torque Pro or Dash Command apps on your phone too.

 

These trucks were made to be diagnosed and serviced with the Tech-2.  A VXDIAG Nano adapter talking to a laptop or tablet and using Tech-2-Win software works too.  I have a Tech2 for working on mine.

Lsxtrucker Enthusiast

Lsxtrucker

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 I'm not being cheap I just would like to know what it's capabilities are, especially when we are talking a couple hundred bucks, the same cost I need to pay for a good tune. 

swathdiver Senior Enthusiast

swathdiver

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23 hours ago, Lsxtrucker said:

 I'm not being cheap I just would like to know what it's capabilities are, especially when we are talking a couple hundred bucks, the same cost I need to pay for a good tune. 

The Tech-2 is the dealer level scan tool that these trucks were designed to work with.  

 

 

Yes, a good tune cost as much or more but this is the most important tool to have in your tool box.  For without it, you do not which of the other tools to use first!

 

chem_man Enthusiast

chem_man

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If you have an android smart phone, order a BAFX ODBII Bluetooth scanner from Amazon https://www.amazon.com/BAFX-Products-Wireless-Bluetooth-Diagnostic/dp/B005NLQAHS/ref=sr_1_3?crid=3NI1HU0L5HHN8&keywords=bafx+obd2&qid=1581875271&sprefix=bafx+%2Caps%2C197&sr=8-3 and then download Torque or Torque Pro from the Google Play Store.

 

This setup will allow you to read codes, clear codes, get real time data, and between the codes and the real time data, it will help you diagnose what's wrong with your truck.

 

 

 

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