No compression in cylinder 4!!!
#1
No compression in cylinder 4!!!
So my mechanic did the compression test on my car and said cylinder 4 was showing 30, meaning there was no compression in the cylinder and hence the misfire
He believes the problem is the valve and not the piston rings and said its a $2,500 fix but recommended against it since my car has 130K miles on it
What you do guys suggest I should do? Any other fix available? Is there anything I can test?
A new engine?
Drive till the car dies?... but unfortunately it is giving me freaking 14-15mpg right now and I don't think I can afford to drive a guzzler like that.
Thanks in advance for any input(s)!!
He believes the problem is the valve and not the piston rings and said its a $2,500 fix but recommended against it since my car has 130K miles on it
What you do guys suggest I should do? Any other fix available? Is there anything I can test?
A new engine?
Drive till the car dies?... but unfortunately it is giving me freaking 14-15mpg right now and I don't think I can afford to drive a guzzler like that.
Thanks in advance for any input(s)!!
#2
Banned
iTrader: (8)
I believe the FSM suggests pouring a little oil in the cylinder then doing the compression test again. If compression significantly increases with the oil then you have piston/ring problems, if it stays the same you have a valve issue. I would try that first.
If you need the exact info let me know and ill try to dig it up.
Goodluck!
-Rob
If you need the exact info let me know and ill try to dig it up.
Goodluck!
-Rob
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onevoice (11-09-2011)
#3
I believe the FSM suggests pouring a little oil in the cylinder then doing the compression test again. If compression significantly increases with the oil then you have piston/ring problems, if it stays the same you have a valve issue. I would try that first.
If you need the exact info let me know and ill try to dig it up.
Goodluck!
-Rob
If you need the exact info let me know and ill try to dig it up.
Goodluck!
-Rob
Does $2,500 sound reasonable? Or should I just look for a new engine and drive the car as little as possible? Or sell it for whatever I can get?
Thanks!
#4
Banned
iTrader: (8)
The mechanic thinks its the valve so I have no other option but to believe him. I don't own a compression test meter so can't do it on my own. Assuming he is correct, what do you suggest I should do?
Does $2,500 sound reasonable? Or should I just look for a new engine and drive the car as little as possible? Or sell it for whatever I can get?
Thanks!
Does $2,500 sound reasonable? Or should I just look for a new engine and drive the car as little as possible? Or sell it for whatever I can get?
Thanks!
Labor wise i would say around 12hours for an experienced VQ mechanic + whatever you can get the parts for. I really think you can find a used head if your patient, just make sure its within specs for levelness.
Goodluck! Let me know if I can help you with anything!
-Rob
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onevoice (11-09-2011)
#5
If it were me and i was 100% it was valve related, I would look around for a used head, they aren't *that* hard to come by, just replace the entire head since actually fixing the one you have would likely cost more in labor. Its still a pretty big job but it can be done in the car in about a day.
Labor wise i would say around 12hours for an experienced VQ mechanic + whatever you can get the parts for. I really think you can find a used head if your patient, just make sure its within specs for levelness.
Goodluck! Let me know if I can help you with anything!
-Rob
Labor wise i would say around 12hours for an experienced VQ mechanic + whatever you can get the parts for. I really think you can find a used head if your patient, just make sure its within specs for levelness.
Goodluck! Let me know if I can help you with anything!
-Rob
Also what do you think would be a better route? Buy a used engine, replace the head, or replace the valve on the cylinder?
One last thing, can I damage anything else besides the already damaged engine if I continue to drive the car? Or should I try to fix (whichever route I choose) ASAP?
#6
Banned
iTrader: (8)
Thanks for the info! What is the technical term for this part? Is it simply called the 'head'?
Also what do you think would be a better route? Buy a used engine, replace the head, or replace the valve on the cylinder?
One last thing, can I damage anything else besides the already damaged engine if I continue to drive the car? Or should I try to fix (whichever route I choose) ASAP?
Also what do you think would be a better route? Buy a used engine, replace the head, or replace the valve on the cylinder?
One last thing, can I damage anything else besides the already damaged engine if I continue to drive the car? Or should I try to fix (whichever route I choose) ASAP?
Yes its just called a Cylinder head. I wouldn't suggest trying to repair the valve in the current head because 1) it would likely cost more overall since it would take much longer and 2) I wouldn't trust just any mechanic to do such a job.
You could also buy a used engine, and it probably wouldn't cost much more overall than replacing the head, but with tons of VQs out there with spun bearings and/or oil consumption its kinda risky. It would be hard to know that your getting a good reliable one, that's why i say if your bottom end is fine, just replace the head, that way at least you know what you have.
-Rob
#7
[QUOTE=onevoice;6205337]So my mechanic did the compression test on my car and said cylinder 4 was showing 30, meaning there was no compression in the cylinder and hence the misfire
it could be a BENT valve stem, could be broken compression ring( top slot), could be blown head gasket...BUT it could be just a small chunk of carbon stuck on valve lip....try a can of Rislone for about 60 miles...drive slow and let this stuff work in.. cost u about 3 bucks, worked for me in the past..try it u might be surprised...write back and let us know.
it could be a BENT valve stem, could be broken compression ring( top slot), could be blown head gasket...BUT it could be just a small chunk of carbon stuck on valve lip....try a can of Rislone for about 60 miles...drive slow and let this stuff work in.. cost u about 3 bucks, worked for me in the past..try it u might be surprised...write back and let us know.
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#8
[quote=slim17265;6207196]
Rislone fuel injector can? I simply pour it in when I fill up the car, right?
EDIT: I also found Rislone compression repair, Rislone ring seal and Rislone engine treatment. I am assuming you are talking about the compression repair one?
So my mechanic did the compression test on my car and said cylinder 4 was showing 30, meaning there was no compression in the cylinder and hence the misfire
it could be a BENT valve stem, could be broken compression ring( top slot), could be blown head gasket...BUT it could be just a small chunk of carbon stuck on valve lip....try a can of Rislone for about 60 miles...drive slow and let this stuff work in.. cost u about 3 bucks, worked for me in the past..try it u might be surprised...write back and let us know.
it could be a BENT valve stem, could be broken compression ring( top slot), could be blown head gasket...BUT it could be just a small chunk of carbon stuck on valve lip....try a can of Rislone for about 60 miles...drive slow and let this stuff work in.. cost u about 3 bucks, worked for me in the past..try it u might be surprised...write back and let us know.
EDIT: I also found Rislone compression repair, Rislone ring seal and Rislone engine treatment. I am assuming you are talking about the compression repair one?
Last edited by onevoice; 11-11-2011 at 06:48 AM.
#9
#10
[quote=onevoice;6208009]I believe you want engine treatment it is basically 90% kerosene and 10 Xyline. nothing cuts carbon quicker...try it.
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alforque (08-28-2012)
#11
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What the hell is it with these cars and cylinder #4. I lost ALL compression in cylinder #4 with less than 120Kmiles on my '04, turns out the engine ate a big chunk of the exhaust valve on cylinder #4.
I did the work myself with my brother, but I fixed mine.
Here's the thread : https://g35driver.com/forums/g35-sed...back-road.html
Good luck, keep us posted please.
DBarnes
I did the work myself with my brother, but I fixed mine.
Here's the thread : https://g35driver.com/forums/g35-sed...back-road.html
Good luck, keep us posted please.
DBarnes
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