Good Shop in Oakland California area?
- Thread starter LBZ
- Start date
Thanks. I reckon Solano is closed till Monday?
If he does end up there who should he ask for?
Last edited:
Buddy had a local come to his hotel with an Autel scanner and did some tests. #8 cylinder was the one doing the knocking. Changed out the injector, still knocking. Cut the cyl out and it goes away.
Ironically I was working on a Z recently that had the same symptoms and did the same - replaced #8. Same result. Had 300psi compression but the glow plug when I pulled it out was soaked in engine oil. The owner didn’t want to put more money into it so I put it back together and kicked it out. Would have liked to have got it figured out as it may have helped this guy out.
Ironically I was working on a Z recently that had the same symptoms and did the same - replaced #8. Same result. Had 300psi compression but the glow plug when I pulled it out was soaked in engine oil. The owner didn’t want to put more money into it so I put it back together and kicked it out. Would have liked to have got it figured out as it may have helped this guy out.
X2 normally I would swap an injector with another hole to see if the problem follows, or unplugging the injector to see if the knocking goes away.
Well a balance rate would tell you where the issue hole is no? And if that matches up with the area of the noise…….cut it out and see how balance rates change should tell you if you’re cutting out the right hole. Or unplug them one at a time.
An Autel and a snap on. Not sure of models.
I remember some talk about this years ago but I don’t recall if anything concrete was found. I haven’t seen or encountered this issue myself.
Oh and a correction buddies truck is an lly not a Z. Sounds like he’s getting it hauled to the border and he will pick it up from there and figure it out at home. $1300 US to get it there.
I remember some talk about this years ago but I don’t recall if anything concrete was found. I haven’t seen or encountered this issue myself.
Oh and a correction buddies truck is an lly not a Z. Sounds like he’s getting it hauled to the border and he will pick it up from there and figure it out at home. $1300 US to get it there.
Last edited:
300 psi is low in my book, I'll put $100 on that being the issue. I have a lmm here that has been through hell. Owner was told by another tech that he needed injectors. He bought 8 garbage remans. Hacked them in. Still ran like crap, knocking, intermittent misfires. Brought it to me. Told me to replace the hacked up engine harness because thats what he was told must be the problem. I did that, fixed all the fuel leaks, replaced one of the reman injectors again because it was junk, and got it running. As you tip into it, it starts stumbling and misfiring still. It came to me sounding a little like it had bad intake valve seal. So I check compression on all 8 and found 6 to be 290psi, 8 to be 380psi, and the rest leaked down so fast I couldn't get good readings. Pulled the valve covers and found a bunch of bent pushrods. Checked the crank and cam reluctors for tightness and alignment, they were fine. There's some part of the story I'm not getting, but moral of the story is that even an lmm will still start and idle fine with bad compression and valve leaks.
300 is low I agree. And I only checked one hole. But I’ve seen trucks running fine lower than that. Just down on power and were hazy. But not noisey. That said I only checked the one hole on this truck so it may other issues being it has over 350 miles on it.
More importantly is consistency across all cylinders rather then the ultimate number. And how the measurement was taken along with the tool used can greatly effect the reading. But as long as they are close to each other is what we want
