da1spy
New Member
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- #1
I have been reading through the forums and have gleaned a lot from everyone and am looking forward to tackling this "common" issue. Thank you for everyone who has written about these issues and others!
Background:
I started having a random issue over a year ago. All of a sudden, while driving it stuttered/hesitated for a brief moment and then ran rough (CEL, auto start disabled, etc). I pulled over restarted and it didn't have issues and finished trip ok. got home and had it randomly (weeks or more in between) occur thereafter and had my code reader then for the two codes p0300 and p000a. They would come up with a stutter and rough running and resume normal operations.
Took it into the dealership and I had just gotten laid off due to corp acquisition, so didn't have discretionary money for them to dig deep into it (their notes are attached as images). They told me I could keep driving it as it was sporadic, not overheating, etc. It has since started getting worse to the point where it happens at the start of a drive, can restart the engine, may do it a couple of times, and then it runs fine. Usually seems to trigger with that transition at 3k rpm when the oil pressure changes from 30 to 80... Can occur going up or down in RPM. While its occurring, I can shift to neutral and rev it up fine w/o issue, so exhibited more under load. Usually is a thunk/stutter, CEL, and then rough running/loss of power/mis-fire. Once it gets warm (I am assuming?) it runs fine... granted I'm not on it hard to stress it.
I have also had some knocking occur more recently as well... which sounds like the beloved Rocker arms / cams. Again not consistent... but I definitely had a fairly loud occurrence of it today during one of the misfire occurrences... I am driving my XJ now till I resolve it.
The initial random component almost seemed to lean towards a partial clog? Can that cause a knocking as well? Or is rocker/cam going to be a separate issue.. or both intertwined? Which the mis-fire goes away as it warms up and flows through a clog "more better".
I've done hot oil changes. The tech did a VVT swap (see service notes attached). I've seen the recommendations to get after the intake phaser, oil control valve, and camshaft... and I've seen mentioned that it can get a head or full engine issue (in rare cases).
Questions:
1) Clog, rockers/cam, OCV/Phaser? Obviously I will see more when I open it up (to answer "some" of that).
1A) Can you "see" issues with the OCV/Phaser, sans the "ball"?
2) How do those all play together into an intermittent issue? Granted its occurring more often now.
3) Should I invest in the Jscan before starting the adventure or just get after it?
4) What escalates it to a head or full engine?
5) Sell it down the river after its repaired? Am losing faith in this thing as I was over the yearly allowance and under the mileage allowance (which I have seen others have same issue), so not sure I want to have a continual issue. I also learned way after the fact that I could have maybe gotten some "assistance" form Customer Care if I had reached out to them after my initial visit, but now its too late.
6) what is the "kinda strange" the tech is talking about with oil pressure and pump turning off... it seems like when I watch the guages, it goes from 30-80 normally right about 3k rpm.
Background:
I started having a random issue over a year ago. All of a sudden, while driving it stuttered/hesitated for a brief moment and then ran rough (CEL, auto start disabled, etc). I pulled over restarted and it didn't have issues and finished trip ok. got home and had it randomly (weeks or more in between) occur thereafter and had my code reader then for the two codes p0300 and p000a. They would come up with a stutter and rough running and resume normal operations.
Took it into the dealership and I had just gotten laid off due to corp acquisition, so didn't have discretionary money for them to dig deep into it (their notes are attached as images). They told me I could keep driving it as it was sporadic, not overheating, etc. It has since started getting worse to the point where it happens at the start of a drive, can restart the engine, may do it a couple of times, and then it runs fine. Usually seems to trigger with that transition at 3k rpm when the oil pressure changes from 30 to 80... Can occur going up or down in RPM. While its occurring, I can shift to neutral and rev it up fine w/o issue, so exhibited more under load. Usually is a thunk/stutter, CEL, and then rough running/loss of power/mis-fire. Once it gets warm (I am assuming?) it runs fine... granted I'm not on it hard to stress it.
I have also had some knocking occur more recently as well... which sounds like the beloved Rocker arms / cams. Again not consistent... but I definitely had a fairly loud occurrence of it today during one of the misfire occurrences... I am driving my XJ now till I resolve it.
The initial random component almost seemed to lean towards a partial clog? Can that cause a knocking as well? Or is rocker/cam going to be a separate issue.. or both intertwined? Which the mis-fire goes away as it warms up and flows through a clog "more better".
I've done hot oil changes. The tech did a VVT swap (see service notes attached). I've seen the recommendations to get after the intake phaser, oil control valve, and camshaft... and I've seen mentioned that it can get a head or full engine issue (in rare cases).
Questions:
1) Clog, rockers/cam, OCV/Phaser? Obviously I will see more when I open it up (to answer "some" of that).
1A) Can you "see" issues with the OCV/Phaser, sans the "ball"?
2) How do those all play together into an intermittent issue? Granted its occurring more often now.
3) Should I invest in the Jscan before starting the adventure or just get after it?
4) What escalates it to a head or full engine?
5) Sell it down the river after its repaired? Am losing faith in this thing as I was over the yearly allowance and under the mileage allowance (which I have seen others have same issue), so not sure I want to have a continual issue. I also learned way after the fact that I could have maybe gotten some "assistance" form Customer Care if I had reached out to them after my initial visit, but now its too late.
6) what is the "kinda strange" the tech is talking about with oil pressure and pump turning off... it seems like when I watch the guages, it goes from 30-80 normally right about 3k rpm.
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