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Old 05-14-2020, 10:02 PM #151
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Engine load?
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Old 05-14-2020, 11:38 PM #152
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Add tps


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Old 05-15-2020, 05:31 PM #153
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YouTube


Here is a datalog
Who knows if I did it right.
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Old 05-19-2020, 03:53 PM #154
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So looks like I have come to a dead end. Im about out of my area of expertise on this.

Need to find a mechanic that has a good scanner and who can figure it out.

If anyone has an input on that catalog deal Im all ears.
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Old 05-20-2020, 12:29 AM #155
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Quote:
Originally Posted by sweet88gt View Post
So looks like I have come to a dead end. Im about out of my area of expertise on this.

Need to find a mechanic that has a good scanner and who can figure it out.

If anyone has an input on that catalog deal Im all ears.
you have checked for a vacuum leak and found nothing correct - I have heard you can spray brake cleaner / other flammable aerosols around the vacuum lines to check for this. Perhaps the O2 sensors are bad ( I don't think they are terribly expensive or hard to replace. Have you changed out the fuel filter? Just swining in the dark.
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Old 05-20-2020, 12:58 AM #156
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From another thread where the fuel filter apparently fixed an idle issue. Probably won't help, but at this point, if I am not mistaken you have already checked: Plugs, Wires, TPS, IAC, Fuel Pressure, Fuel Injectors?, vacuum hoses, MAF. May be worth it to see if its one of these weird gremlins ( O2 sensor, fuel filter), before moving on to ECU stuff.

Quote:
I understand this is an old thread but i figured for the benefit of the next person that is searching for a solution, I'd add my insights here.

I had done a valve cover gasket job and replaced the air boot due to a tear. While I had the throttle body off I cleaned it along with IACV. I replaced the PCV as well. When I got it back together, my idle was high. It's been that way for about a year. Usually when the truck would warm up after driving it around, the idle would return to the normal range. I tried resetting the ECU multiple times. I replaced the MAF. Cleaned the MAF later. Replaced the air K&N air filter. Removed the throttle body and IAC again. Everything looked good. I checked the vacuum hoses looking for leaks. Nothing there either.

Today, i installed a new fuel filter and VOILA! No more high idle. Note I didn't even remove the battery ground to do this. I just unplugged the connection to the fuel pump, ran the fuel line dry (wouldn't start actually) and replaced the filter. Happy to report no high idle. If the problem should return, I will report back.

Hope this helps someone down the road
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Old 05-20-2020, 04:25 AM #157
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Your LTFT for bank 1 is all over the place. Anywhere from 3 to almost 20. That’s your missfire and P0171 codes.

You replaced the injectors correct? If so you may have gotten a bum set or they aren’t seated in the intake correctly.

Or there is a sensor not providing proper data to the ECU.


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Old 05-27-2020, 02:02 PM #158
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So I let this thing sit and walked away from it to clear my mind.

Test drive again and now no misfire codes in the 30 min ride with about 10 miles of driving. Start and stop let it sit in parking lot and such.

So no misfire codes
Just the P0171
I haven't done anything to try to fix. My guess now is a vacuum leak since I have had the intake off a few times.
I have cleaned MAF so Im hoping that is good.

Ran well with no stall. Check engine light only came on right before I shut the engine off when I got home.
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Old 05-27-2020, 02:03 PM #159
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Quote:
Originally Posted by 19963.4lsr5 View Post
Your LTFT for bank 1 is all over the place. Anywhere from 3 to almost 20. That’s your missfire and P0171 codes.

You replaced the injectors correct? If so you may have gotten a bum set or they aren’t seated in the intake correctly.

Or there is a sensor not providing proper data to the ECU.


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I had a set of injectors cleaned and installed them.
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Old 05-27-2020, 02:04 PM #160
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Quote:
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From another thread where the fuel filter apparently fixed an idle issue. Probably won't help, but at this point, if I am not mistaken you have already checked: Plugs, Wires, TPS, IAC, Fuel Pressure, Fuel Injectors?, vacuum hoses, MAF. May be worth it to see if its one of these weird gremlins ( O2 sensor, fuel filter), before moving on to ECU stuff.
Fuel filter was the first step.
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Old 05-27-2020, 02:40 PM #161
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Silicone Boost Vacuum Hose

I see people using this back in the day. Anyone use this ?

Since my local parts store has crap for selection and they collapse under vac.
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Old 05-27-2020, 03:25 PM #162
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Silicone Boost Vacuum Hose



I see people using this back in the day. Anyone use this ?



Since my local parts store has crap for selection and they collapse under vac.
I just buy the OEM ones when they split. Shouldn't be too many that are split or rotted. I think I had to replace 3 total vacuum lines on these 3.4 liters.

Lots of folks buy silicone vacuum lines.



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Old 05-27-2020, 05:45 PM #163
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Quote:
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I just buy the OEM ones when they split. Shouldn't be too many that are split or rotted. I think I had to replace 3 total vacuum lines on these 3.4 liters.

Lots of folks buy silicone vacuum lines.



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From the dealer or aftermarket ?
Its the size and quality I can't find here.
I might check Napa
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Old 05-27-2020, 07:39 PM #164
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I bought the molded PCV and the hoses from the IAC to the two injector rails from the dealer.


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Old 05-27-2020, 07:51 PM #165
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Quote:
Originally Posted by sweet88gt View Post
So I let this thing sit and walked away from it to clear my mind.

Test drive again and now no misfire codes in the 30 min ride with about 10 miles of driving. Start and stop let it sit in parking lot and such.

So no misfire codes
Just the P0171
I haven't done anything to try to fix. My guess now is a vacuum leak since I have had the intake off a few times.
I have cleaned MAF so Im hoping that is good.

Ran well with no stall. Check engine light only came on right before I shut the engine off when I got home.
I have heard you can try and search for a vacuum leak spraying a flammable aerosol around all the hoses while the car is running. I used starter fluid and sprayed into the airbox as a positive control and barely noticed a difference, so I am not sure if its the best test.

You can also try a smoke machine, but I don't think a small leak would cause you so many issues.
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