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Old 10-09-2020, 05:52 PM #16
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Quote:
Originally Posted by djpope09 View Post
That test kit looks awesome. How lean is your bank 2? I've noticed that my LTFT on that bank is around 10% while the other bank is closer to 0%. I haven't been able to figure out why. I don't have a whistle like yours, but I also haven't tried to track down any vacuum leaks. I'm interested to hear what you find.
My LTFT bank 2 is 7.81% and bank 1 is 0%. So it has to be at the intake or cylinder level. I was concerned that it was a head gasket leak affecting the fuel trims. So fuel injectors are cheap $30 ea rockauto reman. The gaskets are cheap $5 each. So the plan now is to pull the intake plenum and reseal the runners and replace injectors. The spark plugs are new and I switched the igniters from left to right with no change. Its not ignition related. I do have a p0446 large vac leak and from what I have read seems to be a charcoal canister seam leak. A lot of silicone or JB weld will be used and hopefully resolve that issue. The emissions leak would alter both banks LTFT so these must be different problems.

The test kit is a Lisle tool I bought at Advanced Auto parts. $42. It attaches to the vac port with a hose.
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Old 10-10-2020, 11:45 AM #17
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Long & Short Term Fuel Trim

Great subject with the head gasket and the approach to trouble shooting.
You mention the differences between bank 1 and 2. I'm very green interpreting this information. What exactly is this showing us?
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Old 10-10-2020, 11:51 AM #18
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Great subject with the head gasket and the approach to trouble shooting.
You mention the differences between bank 1 and 2. I'm very green interpreting this information. What exactly is this showing us?



What Fuel Trim Values Should Be
Ideally, the STFT and LTFT should be within a few percentage points of zero when the engine is idling or being held at a steady RPM. Remember, STFT can bounce around quite a bit as when you suddenly snap open the throttle or decelerate. But LTFT can tell you if the average fuel/mixture is running rich or lean.

Good LTFT values should be as close to zero as possible, though they can range from 5 to 8 percent depending on the condition of the engine. If the LTFT is getting up around 10 percent or higher, it usually indicates a problem that needs to be diagnosed.
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Old 10-10-2020, 02:00 PM #19
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In order to get accurate fuel trims the coolant temp should be 175*F or higher first. Then check. It looks like you have a general small vacuum leak because both banks are running lean and adding fuel to compensate. But well within limits the computer can control

Watch this video and it will explain all

Secret of Engine Problem Diagnosis- Fuel Trims Pt.1 - YouTube
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Old 10-10-2020, 04:08 PM #20
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Quote:
Originally Posted by Drcoffee View Post
In order to get accurate fuel trims the coolant temp should be 175*F or higher first. Then check. It looks like you have a general small vacuum leak because both banks are running lean and adding fuel to compensate. But well within limits the computer can control

Watch this video and it will explain all

Secret of Engine Problem Diagnosis- Fuel Trims Pt.1 - YouTube
Awesome,
Thanks
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