7
votes
Accepted
Canister purge valve constantly opening
The Purge is controlled by the PCM with a pulse width modulated switch signal. It is normal for it to cycle rapidly. This allows small amounts of the fuel vapor to be metered into the cylinders. This ...
- 11.6k
3
votes
Accepted
Will the check engine light come back on if I erase the code using OBD2?
If the problem persists then yes it will come back on. Those type of fault codes are usually not instant tho so it may take some time to see it again.
After fixing the gas cap the code may clear ...
- 3,790
3
votes
3
votes
Accepted
Can I keep driving with P0456?
The code P0456 indicate a leak that is not so severe, compared to a P0455. Since you already replaced the fuel cap, so the problem can be in many other parts of the fuel system that can be very ...
- 1,739
2
votes
95 blazer evap can purge solenoid valve to evap purge pressure switch valve
Don't know if this helps; best I could find...
- 12.4k
2
votes
Accepted
Evaporator canister purge system advice needed
I removed the top hose (engine to canister) and drove. I still experienced the run-on, so I believe this conclusively rules out the canister as the cause of the dieseling.
I also found that the ...
- 476
2
votes
Ford Expedition Eddie Bauer 4.6 V8 2003 automatic rpm goes high
This situation could be Transmission Flare. The engine control briefly ups the RPM to match the transmission downshifting, to prevent an abrupt downshift feel. If the control or sensing systems are ...
- 2,159
2
votes
Can't fill car up with gas
Slow or no flow for fuel in means no or low vapor flow out the vent system.
Steps to test for testing for a blocked vent:
Remove the CAN VENT fuse, #64 in the Underhood Bussed Electrical Center (...
- 11.6k
2
votes
Replaced my upstream O2 sensor, still get P1133 code
Check for an exhaust leak before or right after the o2 sensor, have someone use a rag and plug the exhaust while you listen. Or smoke test the exhaust system. Also check for vacuum leaks or any other ...
- 10.7k
2
votes
Difference between P0133 and P1133
The difference is regulatory not technical. P0133 is the SAE generic version. It satisfies the USEPA and CARB that this failure is covered under a code and conforms to regulated descriptive language. ...
- 11.6k
2
votes
Accepted
Which codes does the front oxygen sensor throw?
From http://o2sensors.com.au/static/o2-sensor-identification-and-locations :
So what is Sensor 1? Sensor 1 is the O2 sensor that is located before
or upstream of the catalytic converter. (Pre-cat)...
- 2,567
2
votes
How are EVAP system leaks detected by the ECU?
The most typical system used by GM is a vacuum decay type system.
The system has 3 major components (for leak detection that is); purge solenoid, vent solenoid and a pressure sensor. Under normal ...
- 16k
2
votes
Accepted
1986 Dodge B250 - EVAP cannister removed, pressure in gas tank, ramifications / solutions
The tank should be vented, and done properly it should vent into a canister. The purge line to the carb is less important, but a hole in the carb under the butterflys is likely creating a vacuum leak....
- 12.4k
2
votes
I need the correct 2010 hyundai veracruz drive cycle steps to clear a "Permanent " P0456 code
I found this PDF with Drive Cycles for Hyundai's, which should include your Veracruz. Here are the relevant parts of the Drive Cycle to include the graphic from the PDF:
General Instructions:
Drive ...
- 152k
2
votes
Evap vent valve normally open - fuel vapors don’t leak out?
The canister is filled with activated charcoal, which is very effective at storing fuel vapors. Effective enough, in fact, that no fuel smell is detectable before the canister is purged by fresh air ...
- 944
2
votes
Accepted
Evap System Leak, Repair and Clear Codes to Pass USA State Emission Inspection?
I wanted to followup on this one, in case anybody else gets here.
Brief review: In many (all?) states within the USA, an annual emission / SMOG test is required at the time of registration renewal. ...
- 6,569
2
votes
Accepted
P171 Bank 1 running too lean - 2006 Mercury Milan
Since you have a scan tool, check the fuel trims to see if the ECM is adding fuel to compensate for a vacuum leak. ECM can add up to 25% more fuel, which would indicate a fairly large leak in the ...
- 1,372
2
votes
Accepted
Understanding the Voltage coming into an Evap Purge Solenoid
From what you are describing, it sounds like you are testing the voltage to the solenoid while the solenoid is unplugged.
If so, that is not a valid test, you need to have a “load” connected to the ...
- 24k
2
votes
Fuel/gasoline smell under car. Normal or problem?
You should not smell gasoline vapors. Usual causes are leaking fuel cap, leaking fuel tank, leaking fuel lines, leaking fuel filter, or issues with the evap system.
The evap should vent itself into ...
- 12k
2
votes
Accepted
If I go in and remove car evaporator, does that mean I will no longer be getting any smell problems?
All parts of the ac circuit get dirty - which is why you need to clean them.
Removing the evaporator will not remove all the smell and will stop the ac working.
The ac can be used to demist the ...
- 34.6k
1
vote
Accepted
2005 Subaru Impreza WRX P1446 Fuel Tank Sensor Control Valve Circuit Low
"Circuit Low" immediately sounds like a voltage problem. I would begin by checking continuity with a multimeter from the sensor to your ecm (engine control module) and finding what voltages ...
- 48
1
vote
Accepted
Evap code and the gas cap
You might try some rust converter like POR-15. If you do use something like that, you'll want to let it completely dry before putting the cap back on. This stuff will bond whatever touches against it ...
- 152k
1
vote
Corolla EVAP Canister Location
From this page about a recall for these cars, it looks like it is mounted in the top of the fuel tank. There may be a panel under the carpet that you need to remove to get access -
- 24k
1
vote
Are mineral oil smoke test machines sensor safe?
If you apply the smoke to the pipes and sensors for extended periods of time (weeks or months) then most likely yes.
However, for a 1 off short period to find a fault probably not - this does assume ...
- 34.6k
1
vote
Does every modern car have an evap vent valve?
Normally, pressure that develops during filling the gas tank is relieved by venting to the atmosphere via the filler tube (some locales require filler nozzles to be equipped with vapor recovery, in ...
- 605
1
vote
Why gas build up in tank?
TL DR: Most likely this is not an issue, but rather the EVAP system at work.
Every emissions controlled vehicle has an EVAP system which controls the amount of fuel which is exhausted to the ...
- 152k
1
vote
How does EVAP interact with a vehicle?
First of all, it looks like my fuel tank has a separate "breather" hose separate from any kind of "EVAP" system. I can see it coming out from the bottom of the vehicle, and I'm guessing it probably ...
- 152k
1
vote
Accepted
Vent Valve (Solenoid) leak and fuel consumption
Well there was a vacuum leak. Plain and simple logic dictates a drop in fuel efficient performance as the gases are not being recycled as the Evap system would when it's running without leaks at ...
- 696
1
vote
EVAP Leak One Day After Engine Work - Unrelated?
You can check the vacuum line for the purge valve and the related connector. If you follow the under hood vacuum diagram, it'll lead you to where the valve is. More than likely it's just a coincidence....
- 10.7k
1
vote
Replace discontinued evap line?
Any competent refrigeration engineer / shop can sort a suitable replacement and they will be able to match fittings etc.
- 34.6k
Only top scored, non community-wiki answers of a minimum length are eligible