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Old 05-14-2019, 04:56 PM   #1
cmderden79
 
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Question No Boost and Live data Help Needed.

Recently purchased a 2006 Sprinter. We knew going in the EGR was throwing a fault and likely needed to be cleaned/replaced. It was very dirty and clogged so we replaced rather than cleaning it. Unsure if the old resonator was causing any issues so we replaced with the aluminum eliminator that seems highly regarded, cheap fix, and easy to do. We have inspected all hoses to the best of our knowledge all seem fine (actually quite good as if they are new, this is 96,000 mile vehicle and the hoses felt very supple with little dirt or grime on them).

We still remain without boost, so I assume we are in LHM. One thing we noticed is the MAF was disconnected upon purchase. When we do connect performance seems to drop even more (noticeable change in idle, sometimes resulting in stall out when cranking, sometimes not).

Hooked up our Autel MD802 (thanks forum) and looked at some live readings while driving around. First time using a scanner and admit ignorance. Noticed the following readings.

Engine load is 96% when accelerating
MAP only fluctuates between 14.1 to 14.2 PSI, which I believe I understand means it is only counting BARO and as there is no boost?
MAF seems to read between .16 and .37 when plugged in (when unplugged constant .67 as a default from the ECU)?
RPM's ranged between 1.5k and 3.5k on the numbers above

Based on what I have read on these forums, and my limited scanner experience I feel like it may be a faulty MAF, MAF wiring, or possibly the turbo actuator linkage. Can anyone advise if I am headed in the right direction, and if not do the numbers above point to anything else? Sorry for the inexperience but want to learn to DYI sooner rather than later.
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Old 05-14-2019, 05:19 PM   #2
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Default Re: No Boost and Live data Help Needed.

Should have mentioned. We did pull the MAF and it is a Bosch and looks clean (again, almost new to an untrained eye). No residue or grime present. Air filter was also checked and good.
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Old 05-14-2019, 05:23 PM   #3
Rickpcmp3
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Default Re: No Boost and Live data Help Needed.

What fault code(s) does a scan w/ the Autel give?
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Old 05-14-2019, 05:35 PM   #4
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Default Re: No Boost and Live data Help Needed.

Quote:
Originally Posted by Rickpcmp3 View Post
What fault code(s) does a scan w/ the Autel give?
originally had both an EGR fault code, and the MAF incomplete and low circuit (I believe) codes present. I have them saved and can check later. We cleared the codes after replacing EGR (at this point we did not know the MAF was unplugged).

After clearing we drove for a time to see if any of the codes would come back or if performance would increase. After 20 miles or so we got the P0299 turbo underboost code. Have not seen a recurrence of the EGR or MAF codes.

To this point I have only performed the ODBII scan as I am not sure the best practice for completing a full/auto scan.
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Old 05-14-2019, 10:29 PM   #5
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Default Re: No Boost and Live data Help Needed.

Remove the heat shield (or the top bolt and kind of bend it a bit so you have good visibility of the turbo actuator arm linkage), start vehicle with MAF plugged in, unplug MAF, when you unplug the MAF does the linkage move? If not, good chance the linkage is stuck or the actuator all together is bad.
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Old 05-15-2019, 01:34 AM   #6
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Default Re: No Boost and Live data Help Needed.

We need the specific code numbers from the sprinter specific menu.
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Old 05-15-2019, 02:19 AM   #7
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Default Re: No Boost and Live data Help Needed.

Quote:
Originally Posted by Midwestdrifter View Post
We need the specific code numbers from the sprinter specific menu.
Ok. Got home and was able to retrieve my saved codes. Apologize but I believe they are from the OBDII scan method, not the sprinter specific, but they are all I have available at the moment. I can try and run the sprinter specific scan in the morning (having trouble updating the Autel as I don't have a large SD card reader or slot on computer which is required for MD802 update).

The codes we received on first scan p0100 (maf), p0102 (maf), p0113 (IAT), p0403 (egr), and p0404 (egr). At this point the MAF would have been unplugged, and we replaced the EGR. Codes cleared.


Shortly after this (roughly 30 miles driving) the p0299 turbo code appeared.

Most recent scan saw the p0100, p0102, p0406 return...p0299 still there as well.

At this point, and since the vehicle is new to us and not sure of all the previous work that has been done, we are thinking of having it professionally diagnosed (pretty well regarded sprinter mechanic close by).

One other thing I noticed when looking at the live data saves. It is showing the BARO as 14.2 (which explains the constant MAP 14.2 reading I suppose), but I found this curious as the BARO pressure for Dallas Texas is generally right around 30.
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Old 05-15-2019, 12:38 PM   #8
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Default Re: No Boost and Live data Help Needed.

At sea level air pressure is 14.7psi approximately.
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Old 05-15-2019, 03:36 PM   #9
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Default Re: No Boost and Live data Help Needed.

Quote:
Originally Posted by Midwestdrifter View Post
At sea level air pressure is 14.7psi approximately.
So does that mean the reading is good? Sorry for the ignorance but the BARO reading and sensor seem to have little information available. I assumed that it should return a value for my area if it was working properly, which would be in the 29-30 range. From what little I have gathered the sensor is actually on the ECU and is not fixable so that had me worried. If the 14.7 is to be expected (or is an ECU plausible value substitution) I will move on and look elsewhere.
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Old 05-15-2019, 03:55 PM   #10
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Default Re: No Boost and Live data Help Needed.

Quote:
Originally Posted by Midwestdrifter View Post
At sea level air pressure is 14.7psi approximately.
As MWD says, standard sea level atmospheric pressure is 14.7 PSI, or the way barometric pressure is usually reported, 29.92 inches of mercury. Essentially just different units of measurement.
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help..help..help, lhm, maf sensor, t1n, turbo boost

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