olddawg

I located this capacitor and see there's one on each bank. I'll assume if cylinder #3 is the issue the capacitor on that bank would be the problem. I'm attempting to order two of them. Hard to find and that site is very slow...

Contacts are corroded so no doubt they are not functioning as they should. Disconnected on Bank 1 (passenger) and found no difference in performance. I'll remove it completely tomorrow and test it. If it tests good, then I'll solder it back on.

The site is still working and I don't believe the order willl go through...

F150Torqued

Capacitors are hard to test. Especially low value ones and I really don't know what value these are supposed to be. But unless you have a 'capacitor tester' and have to use an ohm meter all you can expect to see is a small bump of the meter - then nothing, like open. I would just try to replace them and make sure there is no poor or corroded connections ANYWHERE in that circuit that could result in high resistance - voltage drop under high current draw.

PS:
Then to confuse more - subsequent touches of the meter leads does NOTHING, unless you 'reverse' the ohm meter leads. A capacitor is actually nothing but a very very small battery.

olddawg

I have a capacitor tester. I am researching what value it should read. So far 0.25uFd or 255nFd, but that's an older unit pre 2000.. Still should get me near. It will be obvious if trash.

I need to get it pulled and inspect/test them. It's below freezing 'again' today so may wait till tomorrow...

olddawg

capacitors look good. 264.85nF. Close enough! Just can't do nothing with it today.. No Joy..

olddawg

Both capacitors tested, terminals cleaned and reinstalled.. No Joy..

It was cold yesterday (mid-20's) and I was very hopeful as cold idle it was running smooth! Interesting! Once warmed up though the sputtering came back. I cleared the DTC's and ran it around the block. Not long enough I guess to get the DTC's back..

I'll run it again today and stare at it a bit hoping for a thought of direction...

laterongc

I’ve been following along (hoping to learn) and am curious for a little clarification on what you are experiencing now:

- I thought you were down to a single recurring (same) dtc, but above refers to clearing multiple codes?

- is the sputtering condition only at idle, or does it do it at all rpms/conditions ?

- have you been able to determine if simply “sitting” or “cooling off” makes it run OK again? If so how long does it take?






-

olddawg

[QUOTE=laterongc;7174178]I’ve been following along (hoping to learn) and am curious for a little clarification on what you are experiencing now:

- I thought you were down to a single recurring (same) dtc, but above refers to clearing multiple codes? Main DTC is the PO353. I have a O2 DTC now on bank 1 which makes sense with rough running on #3.

- is the sputtering condition only at idle, or does it do it at all rpms/conditions ? cold idle (below freezing startup) it runs clean. Once warmed up it sputters, once driving it barely make a hill. Cold idle above freezing it sputters a bit.

- have you been able to determine if simply “sitting” or “cooling off” makes it run OK again? If so how long does it take? Once warm it barely holds an idle. Warm it runs like crap.

I'm heading out there soon with temps heading towards 40's. I'll put the computer on it this time and do some run tests and await the DTC's to happen. Hope that clears things up a bit..

Any hints where to go from here?

olddawg

I still have the PO353 and the O2 sensor bank 1.. Still running rough. Cold idle sputters, which I half expected with temps being warmer. No clue why this is.. just adding info.

With no other clue how to proceed, I'm going to start at the beginning again tomorrow. Hope is I did something right and just missed something small along the way. I just have no other thoughts right now as how to proceed...

I'll update again later tomorrow.

needsmoarturbo

I saw another thread where someone was chasing that same code and claimed when they took it to the dealer they told him the mis was on cylinder one and after they fixed that they were good? Sounds odd but might be worth looking at?

olddawg

At this point.. I'm up for anything!