Stage II TT CEL Help!

elliotty

Well it happened again. Car bogged down and cut off. No CEL this time. I looked at the data log and one Bank 1 sensor is a 1.xx volts while Bank 2 is 4.xx. Seems like the MAF is acting up.

SAM@GTM

What is the exact Maf voltage at idle . If one maf is reading 4 volts at idel then you have a bad maf sensor .

Sam

VQStryker

bad sensor like what Sam said. Replace bank 2 (driver side) MAF sensor and you'll be gtg

Or replace them both with these MAF sensors:

UpRev MAF GT

^^^not nessesary, you can get your OEM MAF sensor at Nissan but just another option if you want to do both sensors.

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SOLD- Stryker TT super sleeper (12.35 @ 121mph) no gripZ No Z

elliotty

At idle, both MAF sensors are reading .82. Once I get on the throttle and start to build boost is when the engine hits a wall and cuts out. At this point on the data log, the two sensors are reading very different from each other. Could it be that I have a big boost leak? I have included a screenshot of the two MAF Volt charts (you can see the difference). At one point, Bank 1 is reading 3.96v while Bank 2 is reading 1.27v. It is hard to see in the picture, but the Red and Green lines are the two MAF Volt plots.

Attached Images

Uprev Chart.jpg (72.9 KB, 20 views)

VQStryker

ill go check for you

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SOLD- Stryker TT super sleeper (12.35 @ 121mph) no gripZ No Z

VQStryker

so im in my driveway and did some quick, easy accelerations and you may have a boost leak or a vacuum leak. do you have a boost gauge or controller and have you tried the throttle body cleaner trick I told you? Also, do you have the MAF cleaner?

Im getting almost even voltage to each MAF in both banks and a lot of wheel spin . I need new rear tires

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SOLD- Stryker TT super sleeper (12.35 @ 121mph) no gripZ No Z

elliotty

Thanks for doing your testing! I do have a boost gauge and boost controller tapped into the vacuum lines going to the waste gates. I have not tried the throttle body cleaner trick, but I did do a boost leak test a couple weeks ago and didn't find any. I will have to pick up some MAF cleaner and throttle body cleaner and poke around a bit.

How high do you see your MAF voltages when you are accelerating? Do they ever get as high as 4 volts? It seems like the one sensor could just be acting up.

Thanks again!

VQStryker

I stopped a little before 4,000rpm and was seeing 3.xx volts so im not really sure.

Also:

check your waste gate lines, BOV line, and all fitting to make sure they are still connected and no holes or anything of that nature are present in the lines.

This is one of those things where I wish the person was closer so I could just have them come over and help them finnd the problem. I really hope you find whats causing this and lmk if you need to know where the fittings are that you sould check.

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SOLD- Stryker TT super sleeper (12.35 @ 121mph) no gripZ No Z