Steve,

for comparison to your truck before the injector upgrade:

2000 Excursion
stock injectors 230,000 miles
Parked outside overnight - not plugged in
24 degrees at startup
WTS light on for 10 seconds
starting as soon as WTS light goes out
5W-40 oil

She starts a bit better with the 5W-40 oil compared to 15W-40. Can't tell so much at 25 degrees but when it's zero or below it is a huge difference.

 

Rich....just a quick glance at your numbers...My tunes run about 30% more ICP, more DC and less PW. I can see the lesser PW as I have 30% nozzles, and the higher DC is hand in hand with the higher ICP.

 

That's tuning.

AC 160/100s, not plugged in (but not as cold when video was made):

 

Rich...I agree it's tuning...the high ICP that is. I do wonder what the long term effects of high ICP at relatively low MFD has other than atomization. Is is harmful over the long haul on the poppet seats...more so than "normal" ICP? Does it cause a reduction in life span of the injector? I don't know.

 

I'm no expert but I think you already know the answer to your question Dan.......or at least a pretty good hypothesis.

I think the widespread use of AE, Scan Gauges etc. over the past couple years has really allowed folks to really look under the covers at what a particular truck and tuner are doing.......I'm also guessing it is raising some questions around the "how" from various tuners as more data is in the hands of the end user than every before.

Of course, again, I could be totally full of dung......

 

Nope... we'd know if you were, because we've just been empowered with finely-tuned bull dung detectors (AE and other scan tools).

 

Excellent song - Tom Petty

 

Steve,

any news or change with the new MAP sensor?

 

Negative, and this is interesting. I plugged in the new MAP sensor, and it too reads 10.7psi, while EBP and BARO both show the correct 12.3psi (all on a cold engine, KOEO). So I unplugged the MAP hose, and it still read 10.7psi. The problem must be on the electrical side, but the sensor does increase appropriately with boost while driving, so it's not a short in the wiring. I didn't see any MAP mods like Tugly found on Stinky, either. I did switch to 00 on the Hydra, and that had no effect on the reading. So I'm guessing the 5V reference signal is on the low side, which is easy enough to test.

I'm heading into the shop tomorrow to do the new clutch with my buddy. While I'm in there, I'm pulling the VC's to check injector bolt torque, and do a compression test with DanV's new glow plug compression test rig (showed up yesterday Dan, you're the man!). I'll look a little closer at the wiring to the MAP sensor. If it is a low reference signal, I may tap into the reference wire from a different sensor and give it a shot. Tugly Rich - if you've got any insight on the 5V reference feeds (if there's more than one?), and where it/they come from, let me know.

With all the other sensors/readings looking good in AE, if I get the MAP sensor back to normal, and if compression looks good, AND I still get the cold start smoke, I'm going to try a tune from Tony Wildman (since he tuned WhiteBuffalo Rich's rig with the same sticks). Fingers crossed on the compression test...

Anyone have an idea what I should be seeing for compression test psi at 4800' elevation?

 

WhiteBuffalo Rich just got me thinking (coffee is starting to kick in) - on the new version of AE that I have, there isn't a MAP voltage PID available, only the PID where it's converted to psi. What if they scaled it incorrectly? I know older versions had fuel injector pulse width off by a factor of 10. On my AE version, it's off by a factor of 7! Maybe the MAP is just fine, but AE is showing it as being off. Something to keep in mind. I'll pull the reference voltage tomorrow, and I'll see if I can't get some voltage readings at the sensor, KOEO and at idle.

 

I saw a table that reference difference in elevations...can't recall. But I think you're looking for an out liar...1-2 holes way below the others. Record your numbers and we'll dig up the table.

Edit: Found one version

Compression Test Altitude Compensation Factors
Altitude Factor
500 0.987
1500 0.960
2500 0.933
3500 0.907
4500 0.880
5500 0.853
6500 0.826
7500 0.800
8500 0.773

 

so youre seeing essentially a vacuum at idle on the map sensor? That is normal....

However, the fact that you can unplug it and it doesnt change, yeah thats not normal.

Have you tried starting it with the map sensor not hooked up to the intake? just to see if you still have smoke or not? Im starting to think that you're MAP reading is what is causing the issue. That or you need to drop ICP in your tunes at least around the idle range.

No matter how you put it, you're getting too much fuel, or injecting at the wrong time. Only other thing would be low compression, or a lazy injector or two...

 

If there is a MAP fault, the PCM will default to an estimated reading, based on other engine parameters. It's time to do some wire tracing from the PCM to the MAP. I'm looking for the diagram now.

 

When putting the hydra in the 00 position, does it put it in "true stock mode" for troubleshooting and doing KOEO sensor readings?

 

Everything still goes through the chip, but the stock tuning from the PCM is active. It will be weird fueling, but you will get "untainted" readings.