So I have some questions beyond just this vehicle. What is a good rule of thumb for good/in question VE numbers? This vehicle is a pooch off the line and runs very rough like a dead miss at idle. No codes. Havent scoped cam an crank yet cause I didnt have time. But the scan tool timing data looks good. Its a 2.0 4 cylinder not Ecoboost. Fuel rail an low side pressure is great on WOT run. AFR sensor and rear 02 both show full rich on WOT run. At a WOT 1-2 shift RPM is 6170 and MAF is 96 gps , BAR0 29. Using the ATG VE calculator it shows 80 % VE. I think thats low. I only have 75 psi of compression on all cylinders. Yes you read that correctly 75 psi. Manifold vaccum at idle is 20 inhg steady. I have relearned misfire monitor neutral profile correction learn and it passes and learns. The car has no codes and counts no misfires in Mode 6. My theory is for some reason the crank timing is off. On this engine the balancer is not keyed to the crank and the crank reluctor is on the balancer, if it was removed for any reason in the past it could have been installed correctly in time with the cams but the crank not in the correct position. This wouldnt set a code. Injector balance test all match and numbers are identical to a 2016 Edge 2.0 Ecoboost I did injector balance test on earlier in the week. I am attaching no 1 in cylinder capture at idle. So sorry I didnt put a sync to check ignition timing. I got it late today and im going to resume testing Monday. Just wanted to get opinions on the captures. And please chime in with VE experience. Ive put cursors at each 180 event . Im not very experienced with in cylinder pressure transducers. The towers look leaning to me?? Why is the exhaust pocket so much deeper than the intake pocket?? I have also added 4 photos this morning of the cranking in cylinder no 1.
I have several questions. first off, what are you using for a hose on your transducer? A long soft hose will cause a distortion of the waveforms. It looks like the scaling of your transducer is askew, since the zero line is about midway in the height of the waveform. This is showing a -40 PSI on the vacuum pocket. There is no way the engine will run that way, in fact, it is impossible to draw
Thanks Albin. Yes I am using a Snap On 500 psi transducer. I have spoken with John Thorton an Eric Z about this and they both said yes that transducer is junk as far as scaling goes. I can calibrate it with it in the cylinder engine off and it says 0 zero but unfortunately once the car is running all bets are off. Im just using a 12 in compression hose from my Matco set connected to the
as we had a discussion las t week where I stated the snap on teansducer is garbage for incylinder pressure , you can read the article . how ever if you see the pressure gors on the negative side about 30 psi, simple answer bad snap on transducer not only your I got 2 from snap on 3 different devises sane crapy capture , snap on technical service claim the hose being the problem, guest what the
An engine with each cylinder cranking at only 75 psi compression will not start. Try your compression gauge on a known good engine. The idle engine vacuum measures 20 inches, but your running compression captures show very little engine vacuum, during the intake strokes. Connect your transducer in a known good engine to compare.
Ok thanks. I think I saw another Focus same engine at work last night when I left. I will double check all this Monday morning. Thanks for your time. I plan on playing with my 16 Camry 2.5 today at home even tho I know it's not the same engine.
Caleb definitely play with your own car. The best way to learn is on known good. See what your captures look like on your car compared to the broken car at the shop. As Albin and Ray said the numbers you’re getting don’t look right.
First of all, I agree those readings are wonky. I suggest a cam and crank scope to check out correlation. If you ask me, timing is out to lunch.
This is from a 2015 Focus 2.0 but I don't have the cmp, ckp