P0101 + P0300 = ?

[drakon543]

contact cleaner would probably work too. i usually stick to carb or starting fluid for it tho

 

[BG1988]

A simple thing you can do is unplug all your connectors and spray them with Deoxit or other type of contact cleaner. Could be oxidation on contacts or not, but a good thing to do anyway.

even if it appears 'clean' it still can have oxidation mciro film it's working with 5vDC so even small resistance changes can cause issues

 

[tlynch]

even if it appears 'clean' it still can have oxidation mciro film it's working with 5vDC so even small resistance changes can cause issues

Thanks!

 

[tlynch]

contact cleaner would probably work too. i usually stick to carb or starting fluid for it tho

It won't hurt to have some carb cleaner around. It's dirt cheap compared to other sprays, too.

 

[BG1988]

Thanks!

clean each with electrical cleaner or 91% iso (ISO and distilled water check the label before buying should only be the two ingredients )

*DISCONNECT THE BATTERY* so you don't accidentally short things out

this appears clean but even a slight micro film is causing an issue .. for me..

a cheap tooth brush did the job just be gentle but firm so they don't get bent

 

[Cole123456]

Just a different path in case you need different ideas.

I had horribly rough idle symptoms similar to yours (with misfires) and i chased my tail for a long time. I then experienced an episode of an engine de-rate due to a mismatch between the
throttle position sensor (petal) and sensor in the throttle body. I took a gamble and replaced the throttle body. while doing that i realized i had a couple broken manifold bolts. I fixed those.

After that all my rough idle issues went away.

 

[tlynch]

Just a different path in case you need different ideas.

I had horribly rough idle symptoms similar to yours (with misfires) and i chased my tail for a long time. I then experienced an episode of an engine de-rate due to a mismatch between the
throttle position sensor (petal) and sensor in the throttle body. I took a gamble and replaced the throttle body. while doing that i realized i had a couple broken manifold bolts. I fixed those.

After that all my rough idle issues went away.

Thanks for the info.

I think I'll spray around a bit looking for vacuum or intake leaks this weekend. Cylinder 4 is the misfire leader, so I'll see what I can find over there.

 

[tlynch]

Update:

No discernible change in idle when spraying carb cleaner. I think I'll replace the plugs in the near future and keep my eyes, ears and Torque app open for more evidence of problems, if they crop up.

I also bought a fresh can of contact cleaner, so when I am under the hood I can spray some connections. For now, the new can is on a shelf next to an older, still nearly full can that I forgot I had.

I appreciate all of the good information and helpful suggestions.

 

[cam3439]

Are you able to look at fuel trims to see if you’re running rich or lean? A vacuum leak could be toward the bottom of the intake (old gaskets) where it’s hard the carb cleaner to get to, which could still hide a leak.

Have you checked all vacuum connections to make sure you don’t have a leak somewhere?

A tune up may help. Poorly installed wires or broken spark plugs can cause similar issues.

I think your year still came with an external fuel filter, so if that hasn’t been changed then it may be worth a shot. While on this note, check your fuel pressure to be within spec. If there are issues with the fuel regulator/pump/etc. and the motor isn’t getting enough fuel, then it can cause your issue.

 

[tlynch]

Are you able to look at fuel trims to see if you’re running rich or lean? A vacuum leak could be toward the bottom of the intake (old gaskets) where it’s hard the carb cleaner to get to, which could still high a leak.

Have you checked all vacuum connections to make sure you don’t have a leak somewhere?

A tune up may help. Poorly installed wires or broken spark plugs can cause similar issues.

Thanks for your input. I appreciate the thought that you and others are putting into my truck.

I can see fuel trim info. I have not reviewed it, mostly because I'm not sure I know enough about what values I am looking for. I'll read up a bit.

I am fairly certain that I did not check all vacuum connections. I wasn't smart enough to review diagrams to plan all the connections to check. I'll plan ahead better the next time I poke around under there.