Quote:
Originally Posted by andrewwynn
https://www.motor.com/magazine-summa...agnostic-tool/
A very good article.
Suggesting a stuck open purge valve.
If the hose is soft enough you can pinch it shut with a couple pieces of wood and a locking pliers (or pick up the hose pinching pliers made for this job)
Purge valve or dirty / sticky injector.
Have you run injector cleaner? This model engine uses math to estimate the amount of gas per intake stroke. If the fuel pressure is off that's one way for the math to be wrong but when dirty the injectors will shoot less fuel thank designed so fuel trims will have to rise to compensate.
Since there's no feedback loop for How much actually comes out except O₂ sensor and the ECU assumes the injectors are perfect out blames the intake air.
One other test for stuck open valve: I wonder if there's a path to the fuel tank from the purge line a smoke test would feed back out the fuel fill. I can't remember the exact plumbing out might only go into the charcoal canister.
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Yes, I used Red Line S-1 at the beginning of this thread (post 1)
I've been going through the article. Great find!
You may be onto something here. With the car off, I disconnected the purge valve from the harness and applied 12v direct power like the guy did in the video. First 1-2 times I didn't hear a click, then next couple of times I heard the "click". Hoses look fine. The purge line to the gas tank runs under/next to the airbox, by the way.
Then I started the car and scanned things again. This is the first time I noticed the STFTs within range.
Check out the first part of the scan attached.
Purge valve scan.pdf
Then I drive the car for a couple minutes and parked. The elevates STFTs stared to slowly decrease.
Drove the car back home and parked again. The elevates STFTs started to decrease again.
At this stage, I tried clamped the purge valve return line to the tank but I could not get a change in the STFTs.
I thought about removing and cleaning the valve, but at this point, I don't trust it. Going to order a new purge valve tonight.
11-08-2023, 06:41 PM
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