Good morning Mr. George. I forgot to take the readings you requested this morning before I started the truck. However, I did do both the 1-2 at WOT and the brake drag in 2nd gear at 4K, I will post the photos below but the highest I saw at 1-2 with WOT (at least I'm pretty sure it was WOT as getting to stay somewhat stationary, hold the phone and snap a picture AND not run anything/one over was a bit of a juggle) anyway, 1-2 at approx. WOT was MAF:18.49 with a calculated load percentage of mid 80's, it shifted around 4150-4200 RPM, timing advance was 21.* (I cut off last digit in the photo by accident) coolant temp was 167 Degrees F (this test was AFTER the brake drag test), The brake drag at 4K it DID. NOT. LIKE. AT. ALL. it was bucking and fighting and I had to get off the brake ALOT just to let it get to 4K, the CEL was flashing presumably for the bucking and such, probably misfires, smelled a good bit of cat and brakes when I was turning the truck around lol that MAF reading was:17.29 at 82% calculated load percentage, 21.5 degrees of advance and 3953 RPM,.coolant temp was 165 Degrees F, Air Intake Temp for both test? was 57-59 degrees F. I will get the cold key on no start pic around lunchtime today it'll be cool by then; the temperature will only be up to 43 Degrees f by then outside it was about 29 Degrees F when I did these test. Also, the Barometric pressure when I did these was about 30.03 when I did these test and the Approx. Elevation at work here is 525 A.S. Also, I attached a couple of photos of a hose that looks to be coming from the air pump in the front bumper, from the looks of the hose it LOOKS like it was cut by something because it is not a completely straight cut it doesn't appear but, could also be a atmosphere vent that comes cut at that angle from factory I am not sure but it definitely feels like its pumping air out of it, I did zip tie a glove over it for the day last week just to see if my old diabetes addled hands couldn't tell the difference between push and pull when I capped it by hand, with the fan there it was hard to tell if it was sucking to my hand and being blown away by the fan or blown away because its pushing air not pulling it. This morning before the test I noticed a new code for "secondary air pump, I believe P0410 or P0417 so I am assuming maybe it's the O2 pump but can't be sure, can you look and see if that hose is supposed to go somewhere or if it's just a atmosphere bleed or something, I am sure that sounds stupid to guess between but, I AM stupid with this more modern stuff ( I know it's no longer modern but its modern for what I am accustomed to working on lol) Oh, also, along with the new thermostat I have a fuel pressure tester coming so I can do that part of the test for you? me? eh whichever. Also, I THINK that scanner can graph the O2's like you requested, but I didn't remember I needed to do any data taking until I was already driving and on isolated backroads covered in snow I couldn't figure out or at least find how to get it to do it while driving, according to a web search some models of the Actron Autoscanner Plus CAN graph them, I just don't know the model number of mine off the top of my head but I will check it later before I take the cold, no start readings and if it does, I will start it after taking the cold readings and graph them, is there a particular state you want them graphed, i.e. while driving normal, WOT, idling, idling in gear or what would you like? Again, Thank You SO MUCH for wasting your time on me helping my dense self figure this out because it is driving me crazy driving it with it acting up so bad at times but cant afford another vehicle right now. it's especially frustrating considering for a few moments very randomly, it will run almost as good as it did before this. Anyway, Thank You and I look forward to you reply.

 

Good morning Mr. George, I took the readings for the cold key on no start yesterday like you wanted. at the time the temperature outside was 46 Degrees F and the barometric pressure was 30.02. I attached photos of the scanner data for you to review. fuel pressure gauge should be here this evening so I


will get that later tonight or tomorrow and post those results.

 

All of your sensor readings look ok so far. Your MAP reading on a cold engine was a little off but I dont think thats your issue. Your MAF reading and VE are reasonable.

I look forward to your fuel pressure leak down readings. If the fuel pressure is ok at rest then as i said, tape the gauge to your windshield and see if the pressure fluctuates when the truck is acting up. This will tell us if its a fuel pressure problem. If not then we move on.

You are not wasting my time, I am glad to help.

George

 

Thank You so much. I am trying to get to that today since all the snow we have gotten has made it rather impossible. Thank You!

 

Since you’re dealing with crappy weather, here’s something you can do without driving the vehicle. Hook up your scanner in live data and turn the ignition to key on and then slowly move your accelerator pedal down to the floor and back a couple of times and look at the TPS sensor output and see if the output reading is nice and smooth with no glitches or dropouts..

George

 

Just an aside. In post #31 you asked about the slant cut hose circled in the photo. That is is outlet hose for the secondary air pump and it just stays open as shown. No worries about it.

 

Thanks Les, I completely forgot about that question

George

 

Oh! Thank You! I figured its placement meant it would be open air that and being how perfect the odd cut was but I just wasn't sure because I knew it was coming from the air pump and with the fan there I thought, well if the fan TRIED to cut that I'm pretty sure it would busted all to hell but just wanted to be sure. Thank You!

 

Ok, will do! Thanks for the idea! I don't mind the cold actually prefer it and don't mind the snow, but stuff tends to want to break and get cranky when you try messing with it in 10-degree weather lol

 

Good morning, George, I installed the Fuel Pressure gauge last night and took a single photo after it warmed up for ten minutes or so. Then took variously timed photos this morning. All photos have text on them as to when or what the picture was at the time. Last night it started I believe (see photo) around 48-50 Lbs. and stayed there, it was obviously dark on the way home but from what I could see it never changed by more than a pound or so up and down. But the reading-s from different times, is pretty different but I posted photos of all the different readings. When the car would act up, the gauge was maybe reading a pound lower or so than whatever it was before hand, if that, but didn't seem to go erratic and like flicker or hunt all over so I'm assuming that's not what we were hoping for. I don't know because sometimes when it would be acting up, even acting up towards the worse side than normal, some of the times the pressure would still read pretty much the exact same as it did before it started stumbling/hesitating whatever. Even when it was reading 62 Lbs. and I would get down in it to drop in passing gear, it would still have the surging thing like power was coming in and out. I don't know let me know what you think of the results and what you'd like next. As always, Thank You for your time!