Don’t [emoji23], upgraded the maf on my td5 and it seems it’s upgraded the engine to a V8.. well at least fuel consumption wise. Getting loads of power… but the EGT on the madman ems3 peaks at 720 with only the smallest inclines. I’ll take a recording on the nanocom tomorrow. Has any one experienced this new maf with extreamly high fuel consumption @ 6kl per L.
Thanks all
I cannot see how a MAF can do that.
I would be looking at your wastegate thread unwinding and giving low boost=high EGTs.
As I was driving back from Wodonga with my new van , I suddenly saw the EGT gauge looking high and the boost low, and that is what happened. Took me several minutes to diagnose then all well again.
Another reason could be the handbrake dragging or caliper frozen.
Regards PhilipA
Absolutely it can, if the MAF is not reading correctly, the AFR will be totally messed up.
Probably 90% of failed MAF's I see under read, but I think I have had one over read.
You will get better performance with an over reader, but also smoke and high EGT.
This only applies to EU3 though.
I had an over reader and it did not do that.Absolutely it can, if the MAF is not reading correctly, the AFR will be totally messed up.
What it did was revert to zero at high load high revs and caused a big miss and dropout.
Regards PhilipA
A MAF can fail, but the results can be vastly different to another failed MAF.
For instance, in your case I'd take a punt that it had exceeded the stock 710kg/hr reading, then it would read zero, The ECU would fall back to speed density method, you'd get a power glitch and be on your way again.
The other way would be that it could be over or under reading outside of the error checking routine limits in the mapping - not to be confused with the kg/hr limit.
So for instance it could be reading over about 1600mg/stroke at a certain rev range, the ECU will again drop back to speed density, you will get a power glitch and be on your way.
I've had cheap(and some not so cheap) MAFS here that will under read at idle when air temp is low, but then be ok through the mid rev range or when the air temp rises.
This will give you a very very laggy experience off the line, but may be ok when cruising.
The one the OP has may be over reading through mid range flow levels, but then flattening off up high, which will avoid the fuelling method OOR changeover glitch, but still provide smoke and high EGT down lower.
That's why running anything except a genuine or VDO MAF is fraught with issues.
I know fery will say "Genuine only" and I won't argue with him on that, he has probably looked into it much more than I, but I have found the VDO to be at the very least quite serviceable.
It would be interesting to have a new genuine, and VDO and test side by side, but it would take a lot of time and logging.
Cheers
James
I'll have a bit more time shortly and I'll post up a comparison of some different MAF's I have laying around, and also the fuelling consequences of each.
Hi all,
Just back from the property, don't have mobile reception there. Below is heading up a hill with a trailer. I did forget to mention that I've removed the silencer box and replace the mid section with a straight though. The MAF I bought from TR spares and is a VDO sensor. By the time I got to line 2571 or a road speed of 97 down from 103 the EGT was reading 700, I have the ems 3 set at 700 so I started to back of on fuel to keep the temp under 700.
snippit below
Engine speed (rpm) Road speed Coolant temp. (C) Turbo pres. (kPa) Battery volt. (V) Ambient pres. (kPa) Air flow (g/s) Air inlet temp. (C) Fuel temp. (C) Cyl. 1 Cyl. 2 Cyl. 3 Cyl. 4 Cyl. 5 Accel. track 1 (V) Accel. track 2 (V) Accel. track 3 (V) Accel. supply (V) EGR inlet (%) EGR mod. (%) Idle speed error Wastegate mod.(%)
2480 103 89.5 159.8 13.78 93.8 303.2 27.6 71.8 -2 0 7 -5 0 2.834 2.285 2.579 5.015 38.68 0 1525 38.5 2442 102 90 155.8 13.91 93.8 289.8 27.8 68.5 -2 2 3 -2 4 2.773 2.341 2.658 5.01 39.31 0 1490 39.2 2407 100 90 154.9 13.97 94.47 289.8 27.8 68.5 -5 1 3 -8 5 2.773 2.346 2.658 5.01 39.93 0 1445 39.9 2356 97 90 154.9 13.94 94.06 283.8 28.1 68.5 0 1 -1 -4 -2 2.773 2.341 2.663 5.01 40 0 1414 40 2329 97 90.3 156 13.88 93.8 279.2 28.2 68.6 2 1 1 -3 2 2.796 2.319 2.628 5.01 40 0 1368 40 2288 95 90.3 155.8 13.91 93.8 284.7 28.5 68.5 0 4 1 -3 -3 2.806 2.306 2.614 5.01 40 0 1333 40 2253 94 90.3 152 13.94 94.06 272.2 28.5 68.5 -4 2 3 -1 -1 2.757 2.352 2.678 5.01 40 0 1305 40 2224 92 90.3 153.3 13.91 93.94 264.2 28.6 68.5 -1 4 5 -3 -5 2.78 2.335 2.648 5.01 40 0 1272 40 2201 91 90.6 153.7 13.94 94.33 269.8 28.7 68.5 2 2 3 -2 -3 2.78 2.335 2.653 5.01 40 0 1257 40 2173 90 90.6 153.1 13.94 93.94 258.5 28.7 68.5 1 -4 5 -2 -3 2.773 2.341 2.653 5.01 40 0 1227 40 2145 90 91 152.6 13.94 93.8 252.6 28.8 68.5 -1 -1 6 -2 -2 2.773 2.341 2.658 5.01 40 0 1201 40 2133 89 91 153.4 13.94 93.8 252.6 29 68.5 -2 0 4 2 -4 2.773 2.341 2.658 5.01 40 0 1182 40 2107 88 91 152.8 13.72 94.06 253.5 29.1 68.5 0 0 2 -2 -3 2.773 2.341 2.658 5.01 40 0 1168 40 2088 86 91 152.6 13.97 93.94 249.8 29.1 68.5 -1 0 5 -2 2 2.773 2.341 2.658 5.015 40 0 1151 40 2083 86 91.5 152.8 13.91 93.94 251.3 29.2 68.5 1 -1 2 -3 1 2.773 2.341 2.658 5.01 40 0 1136 40 2064 85 91.5 152.6 13.94 93.8 246.3 29.2 68.5 -1 -1 1 0 0 2.78 2.335 2.653 5.01 40 0 1130 40 2056 85 91.5 153.7 13.91 94.06 249.6 29.2 68.5 -1 -1 4 1 -3 2.871 2.25 2.53 5.01 40 0 1111 40 2045 84 91.9 158.4 13.94 94.06 253.5 29.3 68.5 -2 -1 6 -4 -1 2.871 2.25 2.53 5.01 40 0 1108 40 2047 84 91.9 158.1 13.78 93.54 250.1 29.5 68.5 -3 3 5 1 -2 2.865 2.25 2.53 5.01 40 0 1104 40 2041 84 91.9 157.8 13.94 93.94 249.3 29.5 68.5 2 6 3 -3 -2 2.871 2.244 2.526 5.01 40 0 1101 40 2045 85 91.9 157.5 13.85 93.8 255 29.7 68.5 1 -1 1 0 -5 2.865 2.25 2.536 5.01 40 0 1107 40 2041 84 91.5 145.4 13.75 94.06 220.5 29.7 68.3 -4 3 0 -1 -1 2.246 2.852 3.367 5.015 40 0 1093 39.84 2028 84 91.9 139.5 13.56 93.8 224.3 29.7 68.4 1 0 3 -3 -3 2.769 2.346 2.668 5.01 40 0 1094 40 2028 84 91.9 153.5 13.94 93.94 247.1 29.7 68.5 -2 2 6 -2 -4 2.849 2.267 2.561 5.01 40 0 1090 40 2036 84 92.1 155.7 13.91 93.94 249.3 29.7 68.5 -1 -1 2 0 -2 2.849 2.267 2.54 5.015 40 0 1092 40 2040 84 92.1 153.7 13.94 93.68 246.3 29.7 68.5 0 0 2 0 -4 2.806 2.306 2.614 5.01 40 0 1101 40 2050 84 92.1 152 13.94 93.68 243.8 29.8 68.5 0 1 2 0 -2 2.742 2.375 2.701 5.01 40 0 1107 40 2052 85 92.1 149.9 13.91 93.68 242.3 29.8 68.3 0 0 1 0 -3 2.742 2.369 2.701 5.01 40 0 1115 40 2068 85 92.5 149.9 13.91 94.06 242 30.1 68.3 2 1 5 -3 -5 2.742 2.369 2.701 5.015 40 0 1129 40 2069 86 92.5 144.7 13.88 93.8 232.6 29.8 68.3 0 0 3 -1 -1 2.661 2.454 2.815 5.01 40 0 1139 40 2079 86 92.5 147 13.94 94.06 242.8 29.8 68.6 2 2 -1 1 -1 2.72 2.391 2.732 5.01 40 0 1140 40 2085 86 92.3 140.3 13.5 93.94 222.6 30.1 68.3 -1 -1 2 -1 0 2.354 2.75 3.224 5.01 40 0 1147 40 2094 88 92.5 132.8 13.94 94.19 215.8 30.1 68.3 1 -1 0 1 -2 2.461 2.648 3.084 5.01 40 0 1155 40 2102 86 93 137.1 13.94 94.06 229.3 30 68.3 -1 0 4 1 -3 2.569 2.539 2.937 5.01 40 0 1171 40
Could you just post the CSV as an attachment?
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