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post #1 of 21 Old July 20th, 2019, 12:23 PM Thread Starter
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2018 XPT - Pre TB Charge temp issue

2018 XPT4 , 2300 miles

So i've ran into an issue the last couple times i've been out now.... After riding a while, and getting hot ( not overheating hot, just hot) when accelerating, or climbing a hill and the engine is under load and needs to make power, it will spit, sputter, pop, and run like crap, more throttle applied, the worse it runs. It only does it after riding for quite a while. If i let it sit for 5-10 min, it will run fine for 5-10 min, and then the issues returns. If its a new day, the machine will run fine for 45min to and hour, then the issue will return. let it sit for 5-10....runs fine for 5-10...repeat until shut down for an extended time period.

The problem initially started when I was in Silverton, CO at 11000' + elevation... I thought maybe there just wasn't enough air up there to support the stage 2 tune i was running, stopped reflashed to stage 1... ran fine the rest of the trip up there, but i wasn't convinced that was the fix.

last night, it came back at my normal riding area, about 5600', so i don't think elevation has anything to do with it. I'm still running the stage 1 tune, and i don't think the tunes have any influence on the problem, as they've always ran fine up until this point.

I took it out this morning, ran fine initially... took 3 good baseline datalogs, and then ran it really hard for 30-45 min, then the issue started. Took 3 datalogs with the issue happening, then headed home.

No CE codes are being thrown.

After looking at the data logs, I've concluded the computer is seeing and issue with the pre TB charge temp data....but only when the issues starts to happen. the baseline log looks normal, and the log with the problem is all over the place. This is the only input sensor i can see that looks out of place... the ECM output for fuel trim, boost, timing, etc is also way out of line, but thats the effect of the data the ECM is seeing from the pre TB charge temp i think. Post TB charge temp is normal on both baseline and problem logs.

Here is the Pre TB graph, smoother purple line is the base log, crazy blue is the problem log:



Very well could be the sensor going bad, or a noise/ ground issue... I'm looking into the problem now, just wanted to put this out here preemptively in case anyone has had the problem or has had any input.

The oddball with it being the sensor or ground is that it only does it after riding for so long, so i'm leaning toward a long term heat exposure issue.

Also, just to add, it's not directly related to engine temp, during the 30-45 min of good running time, I had the engine temp up to 220 and it never missed a beat.

Thanks in advance, and any input is appreciated, I'm off to chase the issue and I'll check back periodically during the day.

"I strive for a level of perfection I don't possess the skillset to achieve"
2018 XPT4 - Bailey

Help me get some info in these threads: Tire Height --- Front Diff
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post #2 of 21 Old July 20th, 2019, 12:51 PM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

After further looking into the service manual and grasping some functionality... it appears the issue could also be from the Boost sensor, Turbo, or Wastegate..... I didn't realize that the pre tb charge temp sensor, is also the boost sensor, the boost graph is also crazy.... as is the wastegate

Boost Graph:



Wastegate:



MAP:

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post #3 of 21 Old July 20th, 2019, 01:15 PM
 
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Re: 2018 XPT - Pre TB Charge temp issue

Welcome to the club ...I am having a similar issue that I have been chasing for 3 weekends now
Today I am changing out my BOV , Wastegate controller. and then Wastegate actuator Pod

Keep us posted I will do the same if I find a fix
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post #4 of 21 Old July 20th, 2019, 01:19 PM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

Quote:
Originally Posted by Max H View Post
Welcome to the club ...I am having a similar issue that I have been chasing for 3 weekends now
Today I am changing out my BOV , Wastegate controller. and then Wastegate actuator Pod

Keep us posted I will do the same if I find a fix
I didn't think about this issue being similar when I spoke to you the other day. Mine may be farther along than yours (or a different issue), as it's basically undriveable past 1/2 throttle when the issue occurs.
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post #5 of 21 Old July 22nd, 2019, 01:55 PM
 
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Re: 2018 XPT - Pre TB Charge temp issue

Richard - send me your data logs and let me take a look. I doubt it's the IAT sensor, they usually just go bad. I haven't looked at what type of sensor but I'm guessing it's a RTD or thermistor and when they go bad they either open or dead short but not read erratically. You can also give me a call if needed.


BTW- I think we fixed Jeff's issue.
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post #6 of 21 Old July 22nd, 2019, 04:09 PM
 
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Re: 2018 XPT - Pre TB Charge temp issue

The common system is it only happens when the ECT is above 200*f. Boost / fuel / timing all looks ok. It could be that the MAP / IAT sensor is breaking down when it's getting hot. It's only $50, probably the 1st thing I would try replacing it. SENSOR-TMAP,3BAR Part# 2413095
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post #7 of 21 Old July 22nd, 2019, 04:16 PM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

Quote:
Originally Posted by RZR_Joe View Post
The common system is it only happens when the ECT is above 200*f. Boost / fuel / timing all looks ok. It could be that the MAP / IAT sensor is breaking down when it's getting hot. It's only $50, probably the 1st thing I would try replacing it. SENSOR-TMAP,3BAR Part# 2413095
Got one on the way already but....

That is a common occurrence between the trouble logs, but it also doesn't happen when the ECT is above 200įF for the first 45 min.... I had it all the way up to 220 running it hard in the 95į heat, and it never skipped a beat.

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2018 XPT4 - Bailey

Help me get some info in these threads: Tire Height --- Front Diff
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post #8 of 21 Old July 22nd, 2019, 04:36 PM
 
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Re: 2018 XPT - Pre TB Charge temp issue

It could be heat soak and it's taking that long to affect the sensor.
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post #9 of 21 Old July 22nd, 2019, 04:49 PM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

We shall see, thanks for taking a look Joe, I appreciate the help


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post #10 of 21 Old July 27th, 2019, 03:19 PM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

Well... I have not solved the problem, but Iíve concluded the problem is not the TMAP (boost/pre TB), the BOV, or the J tube ( between air filter and turbo, didnít think that was the problem tho).. I ordered a new charge tube as well, but it didnít get here in time for todayís session.... any other ideas?

The factory BOV was deformed at both ports, didnít appear to be leaking, but I changed it anyway ( to the RKX youíre running Joe... thanks for doing the work on that, exact same setup worked perfect for me ), there were no visual issues with the sensor or any connections or parts, I replaced the J tube solely because I ordered the matching charge tube as well, but I didnít think that was the issue, thereís a possibility itís the charge tube, but a small one...

Problem has not changed at all, itís 95-100 ambient out today, Coolant temp was 200 within 10 minutes, but the problem didnít appear for about 45 min still.

One observation, and Iíve noticed this before too... my turbo seems like itís glowing hot more than normal I guess, never pair enough attention to have a solid comparison... but I put a temp gun on it when I got back from testing today... I had cruised 20-30 mph on the way back for a couple miles, pulled into that garage, kept it idling, went to grab my temp gun and check the temp... maybe 20-30 sec before I checked temp, and it was 1050-1100... let it idle for 5 min or so... temp was only down to 950 ish... I know itís normal for it to run hot, and Iím not saying those temps are an issue, or related... but I donít have a baseline to compare to either really, and it was an observation I made that may or may not be relevant...


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post #11 of 21 Old July 27th, 2019, 04:24 PM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

Reviewing the data logs from today now...it looks likes changing the sensor did have an effect on the pre TB reading... seems normal now whether the problem is active or not..



looking at the rest, it still seems the ECU is pulling timing,fuel,and boost when the issue is present....the cause of this seems like it would be the problem...

the requested AFR also goes crazy when the issue is present, not sure if that is cause or effect...

"I strive for a level of perfection I don't possess the skillset to achieve"
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Help me get some info in these threads: Tire Height --- Front Diff
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post #12 of 21 Old July 27th, 2019, 04:43 PM
 
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Re: 2018 XPT - Pre TB Charge temp issue

Hmmm...shoot me the logs.
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post #13 of 21 Old July 27th, 2019, 04:59 PM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

Quote:
Originally Posted by RZR_Joe View Post
Hmmm...shoot me the logs.
Headed your way via e-mail
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Help me get some info in these threads: Tire Height --- Front Diff
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post #14 of 21 Old July 28th, 2019, 05:45 AM
 
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Re: 2018 XPT - Pre TB Charge temp issue

What tune AA or stock? I can only compare the logs to the stock tune. Out of the 5 logs you sent which is it the worst?
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post #15 of 21 Old July 28th, 2019, 07:01 AM Thread Starter
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Re: 2018 XPT - Pre TB Charge temp issue

Stage 2 AA tune, 4&5 were the only ones where the issue was happening, both were about the same as far as how bad it was

"I strive for a level of perfection I don't possess the skillset to achieve"
2018 XPT4 - Bailey

Help me get some info in these threads: Tire Height --- Front Diff
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