Rokktech Crank Sensor Installed...

[TexBamBam]

Sounds a little more like a 2nd gen to me... I have the knock, now it knocks on all six... sounds much better but now the tires squeal much easier when starting out so be light on the go pedal.

 

[RSeger]

Installed Crank Sensor, Yellow Engine Light

I installed a crank sensor this afternoon. Started right up, seems to run smoother (wishful thinking?), good power. Planned (tomorrow AM) to drive down from Bay Area to Hwy 1, then onto Raggd Point to meet my Dad for lunch, but I am concerned that I may have a bad sensor, or I may have done something wrong on installation, and concerned about driving about 250 miles with yellow engine light on.



Also noted that steering box is wet on surface, looks fresh.



Comments appreciated.



Ron



2004. 5, 2500 SLT HO, Black QC, 4X4, 48RE, 3. 73

 

[67guzzler]

Now that you've done the swap, it will probably take you 5 minutes to swap them back. I'd swap them back and then see if you lose the yellow light. If you do, the sensor could be bad..... There was another member here who got a bad sensor. Paul @ Rokktech took care of him to his satisfaction if my memory serves me. Good luck.

 

[OHale]

Now that you've done the swap, it will probably take you 5 minutes to swap them back. I'd swap them back and then see if you lose the yellow light. If you do, the sensor could be bad..... There was another member here who got a bad sensor. Paul @ Rokktech took care of him to his satisfaction if my memory serves me. Good luck.

'Twas I, Mr. Gann and all you say is true. My first sensor threw crank codes (and the check engine light). I also had a very rough start.



Paul at Rokktech shipped a new sensor as soon as I emailed him. The new sensor is running well with no codes. Mr. Seger, I recommend that you email Paul at Rokktech today via their website and let him know you have codes. I was very pleased with Rokktech's response.



By the way, after a two weeks of running the sensor I do appear to be getting 1. 5 to 2. 0 mpg better than pre-rokktech. Rather subjective as I am using the overhead computer, but I monitored it regularly over the past year and have noticed a distinct difference. Soon we will be getting into the winter blended fuel and I expect that gain to shrink.



My low-end torque and response is improved. Acceleration is somewhat flat above 2200 rpm by comparison.

 

[RSeger]

Installed Crank Sensor, Yellow Engine Light

Thanks for the feedback. You were right about 5 mnutes to replace original sensor. I will contact Paul @rokktech. Ron

 

[BIG BOB]

By the way, after a two weeks of running the sensor I do appear to be getting 1. 5 to 2. 0 mpg better than pre-rokktech. Rather subjective as I am using the overhead computer, but I monitored it regularly over the past year and have noticed a distinct difference. Soon we will be getting into the winter blended fuel and I expect that gain to shrink.

You are not getting an accurate mileage reading from the overhead computer. Monitoring it will do you absolutely no good, other that get your hope up. You need to "Hand Calculate" to get an accurate mileage comparison.

 

[OHale]

I'm only using the overhead as a relative measure, not as a quantitative measure.



There is a stretch of interstate 95 between two Maine towns I always use as a mileage reference. I set the cruise at 68 and travel about 20 miles between two exits. I've never had fuel economy readings as high (consistently) as I have after the Rokktech install. The cruise control takes out the human factor. However, who knows what other factors may have played a role? Pehaps fuel quality... ... .



The circumstantial evidence provided by the overhead computer is merely indicative, not conclusive, which would also be true of a hand calculation, although the hand calculation should be more precise. The overhead is a running average based on speed and fuel throughput and has value as a trend indicator, IMHO.

 

[BIG BOB]

I'm only using the overhead as a relative measure, not as a quantitative measure.



There is a stretch of interstate 95 between two Maine towns I always use as a mileage reference. I set the cruise at 68 and travel about 20 miles between two exits. I've never had fuel economy readings as high (consistently) as I have after the Rokktech install. The cruise control takes out the human factor. However, who knows what other factors may have played a role? Pehaps fuel quality... ... .



The circumstantial evidence provided by the overhead computer is merely indicative, not conclusive, which would also be true of a hand calculation, although the hand calculation should be more precise. The overhead is a running average based on speed and fuel throughput and has value as a trend indicator, IMHO.

Have fun wasting your time! :-laf :-laf



Whenever you put on any type of performance enhancement it changes the reading of the overhead computer. Has nothing to do with what the actual results are.



When I put the RokkTeck on and drove 220 miles, same road, same speed (70 mph on cruise), my overhead said 18+ mpg, my actual hand calc was 14. 65 mpg. Prior to the RokTeck the same run I got hand calc 16. 96 mpg. So mileage, I'm not sold on yet (result are inconclusive at this time), however low end performance I am sold on!

 

[OHale]

Have fun wasting your time! :-laf :-laf .

Oh, I HAVE had fun with my truck!



BUT, I do know one thing, and I even hand-calculated it... .



I haven't wasted as much time with my overhead display as WE have discussing it!

 

[BIG BOB]

Have fun wasting your time! :-laf :-laf





Oh, I HAVE had fun with my truck!



BUT, I do know one thing, and I even hand-calculated it... .



I haven't wasted as much time with my overhead display as WE have discussing it!

 

[67guzzler]

Actually -- I think that some mods affect the relative accuracy of the overhead and others don't.



The same amount of fuel is running through the system. The number and duration of the fuel pulses is the same. Everything is the same. All that's happened is that the pulses have been moved forward 2 degrees.



This isn't a fueling mod so I doubt (simple logic implies) that it will have an effect on the relative accuracy of the overhead.



I promise not to roll my eyes at anyone.

 

[OHale]

Actually -- I think that some mods affect the relative accuracy of the overhead and others don't.



The same amount of fuel is running through the system. The number and duration of the fuel pulses is the same. Everything is the same. All that's happened is that the pulses have been moved forward 2 degrees.



This isn't a fueling mod so I doubt (simple logic implies) that it will have an effect on the relative accuracy of the overhead.



I promise not to roll my eyes at anyone.

I agree completely, The sensor would have no improper effect on the overhead. I believe Big Bob is just stating that he doesn't believe the overhead is accurate enough to accurately compute mileage, with or without the mod (correct me if that's wrong. ) I've found my overhead to compare well with a hand calc.



I have no doubt that my mileage has increased and it is reflected on the overhead. Unless some other mileage enhancing factor occurred at the exact hour that I installed the rokktech sensor it was due to the sensor. Possible but not likely.



BTW I also note a more 'diesel' sound with the sensor installed, a bit like my 2nd gen only much quieter. JMO but I got my money's worth.

 

[OHale]

Didn't mean to offend !

 

[testraub]

Well I would like to thank Rokktech for getting my sensor to me so quickly. I'm a BETA tester for the new SP Diesel http://www.spdiesel.com/ 2nd gen box. https://www.turbodieselregister.com/forums/showthread.php?t=141932

It works with their box, but I haven't had anything other then a short trip to see. I'm hoping to get more info after a little testing. Please check the above link to check out some info on the new SP Diesel box for the 3rd Gen (their "2nd Generation of boxes) I'm really looking forward to running both together to see how they interact.

 

[BIG BOB]

What I'm saying is, How can you compare an increase to something that isn't accurate. Any performance mods, including the Rokktech change the ECM readings and outputs. Including, crank timing, cam timing, injection timing, duration and injection pressure, it doesn't have to be a fueling mod to effect the PCM output.



If it were me, I would want an accurate reading, this is why I hand calc. Maybe you are satified with just a visual increase and don't care about reality. JMO



You can use the overhead if you want, it is not an accurate reading.



For those of us that know, we want the true and actual hand calc increase.

 

[OHale]

For those of us that know,

LOL



Who is the 'us' you refer to? :-laf



The overhead is fine as a relative measure of mpg change with similar fuel and STP (standard temperature and pressure. ) Remember, relative. We are intrested in delta (change), less so in a quantifiable value that can not be obtained outside of a laboratory.



I don't have a box on my truck so I don't have to factor in the effect you have noted on yours. Apples to orange comparison.



My mileage has increased with a high degree of confidence based on empirical and circumstantial data as indicated by the factory fuel rate per mile calculator supplied on the vehicle. Disclaimer: your mileage may vary.



Geez this is taking away from the time I waste looking at my trip computer :-laf

 

[BIG BOB]

LOL



Who is the 'us' you refer to? :-laf



The overhead is fine as a relative measure of mpg change with similar fuel and STP (standard temperature and pressure. ) Remember, relative. We are intrested in delta (change), less so in a quantifiable value that can not be obtained outside of a laboratory.



I don't have a box on my truck so I don't have to factor in the effect you have noted on yours. Apples to orange comparison.



My mileage has increased with a high degree of confidence based on empirical and circumstantial data as indicated by the factory fuel rate per mile calculator supplied on the vehicle. Disclaimer: your mileage may vary.



Geez this is taking away from the time I waste looking at my trip computer :-laf

What's the deal? Relative does not apply to the overhead when you make electrical or fuelage changes. The slightest change in either will change the ECM and the signal it send to the overhead reading and it's always goes up and doesn't reflect the true results. It was never accurate from the factory in the first place. Are you afraid to get the real and factual mileage by hand calc and give us the comparison of real numbers? Or are you afraid that you may be wrong and are not getting the mileage your overhead reads. Why feed us numbers that don't give the real facts? If it's for the sake of argument, you won. You have just proven your intelligence level.



I'm done! Not worth my time. Hope you enjoy you high mileage truck.

 

[Giachino]

My low-end torque and response is improved. Acceleration is somewhat flat above 2200 rpm by comparison.

Are you saying you lost acceleration above 2200? Or that it's much improved below 2200 and that it makes above 2200 feel flat?? I'm all for more low end, but not at the expense of mid and up... . please clarify.

 

[OHale]

It's pretty subjective. The 'test' I ran was to go to a local highway on-ramp and make a full throttle acceleration to 75 mph. The low end acceleration was improved. That effect tapered off above 60 mph. I didn't lose acceleration, just the improved low-end tapered off.



Again, the iimprovement isn't like installing an Edge or other performance module. I think for the relatively low cost and easy installation I'm happy.

 

[Okey0]

Relative does not apply to the overhead when you make electrical or fuelage changes. The slightest change in either will change the ECM and the signal it send to the overhead reading and it's always goes up and doesn't reflect the true results. It was never accurate from the factory in the first place.

I tend to agree---all I've seen so far is overhead milage increases. I've yet to see anyone post numbers involving hand calculated milage of before and after the install. And I don't buy into the "it feels like its accelerates better" comments. Feelings can be swayed by your inner conscience wanting to justify the cost of the sensor.



so, does anyone have any verifiable numbers on a milage increase due to this sensor?