Just bought an 07 with P0172
#62
Good call. On it...
This time around I warmed the engine up and they all performed about he same. about -10 stft with any injector wire pulled.
As it was nearing warmed up (160F) I noticed that the o2 voltage reading was holding a solid .65ish, then dropping to .1, holding that for a second, and then climbing back to .65 for another 10 seconds and then repeating. By the time I finished the test it was just flatlining at around .7v.
This time around I warmed the engine up and they all performed about he same. about -10 stft with any injector wire pulled.
As it was nearing warmed up (160F) I noticed that the o2 voltage reading was holding a solid .65ish, then dropping to .1, holding that for a second, and then climbing back to .65 for another 10 seconds and then repeating. By the time I finished the test it was just flatlining at around .7v.
Last edited by gijoe985; 05-17-2017 at 09:32 PM.
#64
I did. They all had the same effect. Went from -30ish to -10ish dor each injector.
#66
Yes I am, but I did remove it, clean it, and recoat it with the proper amount of oil. The previous owner installed it and I no longer have the airbox. It'd be a pain to locate one. I could run no air filter for a short bit? Everything inside seemed clean. MAP sensor and IAT sensor...
#68
I have stupid idea (wish I had it earlier). When you checked your valve clearances and put #1 cylinder in TDC (lined UP mark of the cam sprocket with cylinder head) have you confirmed that TDC mark on crank pulley lined up with pointer on the timing chain cover as well?
#69
So, if the engine idle speed without load is 850 rpm in neutral with throttle fully closed, the ECU may try to lower the idle by cutting amount of fuel at idle ?? It is unusual behavior to me (however, if RPM is not over 1000 IIRC (in tolerances), the idle will not surge).
Can you post a picture of your intake set up (or link to the model if known)?
When I removed air cleaner assembly on 98 Camry 4 cylinder that uses MAP (speed density control) the rpms went to 1500 and stayed there after I started engine up.
(I did master cylinder port blocking test to troubleshoot soft pedal issue)
Can you post a picture of your intake set up (or link to the model if known)?
When I removed air cleaner assembly on 98 Camry 4 cylinder that uses MAP (speed density control) the rpms went to 1500 and stayed there after I started engine up.
(I did master cylinder port blocking test to troubleshoot soft pedal issue)
#70
Is this a system currently installed?
https://www.knfilters.com/images/m/69-1016TS.jpg
https://www.knfilters.com/images/l/69-1016-1TS_Eng1.jpg
https://www.knfilters.com/images/m/69-1016TS.jpg
https://www.knfilters.com/images/l/69-1016-1TS_Eng1.jpg
#71
Is this a system currently installed?
https://www.knfilters.com/images/m/69-1016TS.jpg
https://www.knfilters.com/images/l/69-1016-1TS_Eng1.jpg
https://www.knfilters.com/images/m/69-1016TS.jpg
https://www.knfilters.com/images/l/69-1016-1TS_Eng1.jpg
#73
I don't think there are any modifications in the fose box, but I'll check.
You are right on the EGR! That's odd. I can't find any pictures online of one pointed like mine...
So, maybe the egr is not circulating exhaust gas in (stuck closed) and the computer is expecting the extra flow, hence running rich? Maybe? Hmm.....
You are right on the EGR! That's odd. I can't find any pictures online of one pointed like mine...
So, maybe the egr is not circulating exhaust gas in (stuck closed) and the computer is expecting the extra flow, hence running rich? Maybe? Hmm.....
#75
Well, another small observation, after pulling a tree stump out with my fit (a small tree... just needed about 105hp of nudging), my car was obviously warmed up and I had the AC running to keep my son cool and the stft was lower -25. Then I turned it off and it went to -29. And back and forth. With the extra load on the motor it is slightly less rich.
Also, I visually inspected the EGR and if someone had it apart, there are 3 screws inside. I think you could reassemble it wrong and have it face ar 3 o'clock like mine. I guess I could take it apart. I'm short on ideas...
Also, I visually inspected the EGR and if someone had it apart, there are 3 screws inside. I think you could reassemble it wrong and have it face ar 3 o'clock like mine. I guess I could take it apart. I'm short on ideas...
#76
Hmm, this Delphi rep on youtube said that a stuck open EGR could cause the p0172. "It will dilute the fresh air and so less dense exhaust air will get in and it will be rich. " The only problem with that theory is that I assume the idle would be garbage.
I do have that 850 idle. What might cause that? Should I try adjusting my idle, just to see...
EDIT- I just kept watching, possible a rupture in the vacuum operated fuel pressure regulator. It can leak fuel from the regulator into the vacuum line. (I'm I just getting desperate?)
I do have that 850 idle. What might cause that? Should I try adjusting my idle, just to see...
EDIT- I just kept watching, possible a rupture in the vacuum operated fuel pressure regulator. It can leak fuel from the regulator into the vacuum line. (I'm I just getting desperate?)
Last edited by gijoe985; 05-20-2017 at 09:55 PM.
#77
On Club Jazz, someone described their stuck closed EGR as "Symtoms as described by others: at 1500rpm cruise it behaved like a rat was dancing on the throttle cable" and I can say that my one performance complaint is that at very low throttle, cruising, it does kinda bounce. I just thought it was me... I'm going to take it off and look...
#78
The fuel line is returnless with relief valve type pressure regulator in the gas tank; in the fuel rail the gas only goes one way.
the idle that high can be due to "hacking" idle up diode, programming of the ECU or low restriction intake (as observed on 1997 Camry after removing entire air cleaner box)
The leaking EGR will cause vacuum loss at idle (which will reflect MAP reading, but it looks normal);if EGR valve head (that seals the gas flow) is ground off on one side (so it seats but not seals) it may allow extensive flow without setting a code
the idle that high can be due to "hacking" idle up diode, programming of the ECU or low restriction intake (as observed on 1997 Camry after removing entire air cleaner box)
The leaking EGR will cause vacuum loss at idle (which will reflect MAP reading, but it looks normal);if EGR valve head (that seals the gas flow) is ground off on one side (so it seats but not seals) it may allow extensive flow without setting a code
#79
There is the cavity on the intake that could coke closed with soot and act like a malfunction in the EGR, as well as a hose that is under there that could leak vacuum if it was old/cracked/loose.
Your motor has a lot of dusty sandy stuff,, I have seen that kind of stuff infiltrate places it shouldn't and cause the most bizarre problems,, Especially sensor heads, connectors and relays,,, so some compressed air in the fuse box area, the connectors Pull the relays and check for grunge under them.
Your motor has a lot of dusty sandy stuff,, I have seen that kind of stuff infiltrate places it shouldn't and cause the most bizarre problems,, Especially sensor heads, connectors and relays,,, so some compressed air in the fuse box area, the connectors Pull the relays and check for grunge under them.