hocuz77
Hasn't posted much yet...
- Joined
- Mar 31, 2018
- Messages
- 5
- Reaction score
- 0
- Points
- 1
- Genesis Model Type
- 1G Genesis Sedan (2009-2014)
I am writing this post to capture lesson learned for others that may run into this issue. This forum was invaluable to me in diagnosing my issue.
I have a 2010 Genesis sedan 4.6 with 117000 miles. I bought it used with the owner stating a misfire. I did my research and found that the worse possible scenario would be a broken valve spring that many other genesis owners were having. Long story short, i did take the plunge in purchasing the vehicle at a really good price.
Im going to try to document the trouble shooting i did and in what order.
Engine codes were:
p0306 misfire #6
p0308 misfire #8
p0304 Misfire #4
p0300 Multiple misfire detected
-Pull spark plugs to check for condition of combustion.
-6 and 8 were a bit wet others were dry (I assumed no combustion)
-check coil pack resistance I believe .8 ohms (i bought 4 used ones for 60 bucks just in case)
-I pulled the valve cover and inspected all the valve springs and l could see any issues
I put everything back with the new coils and guess what, still misfiring. I was pretty irritated at this point because I had about 5 hours into the project. My next plan of attack was to buy a compression tester. I should of did a compression test from the start. I figured I buy a cheap Chinese compression tester from craigslist because I am only going to use it sparsely . Hook it up, tested compression in 2,4,6,8 cylinders and got really low numbers, with number 6 being 0. It was not holding any compression on the gauge. I immediately assume my engine was toast and I should start looking for a replacement. DId some researching and it would cost about 2000 to 2500 for a replacement.
Something didn't sit well with me because the car had decent power after 2500 rpm but just ran really rough. So I took a look at the cheap chinese compression tester and I noticed it did not have a schrader(spelling) valve. It used a plunger with a o ring. So I head down to my local parts store and decided to purchase a decent tester from bosch. Tested it and now I was getting normal readings except for number 6 cylinder with a reading of zero. Lesson learned, don't buy a cheap tester especially one with the conversion fitting that is not a hex(easily removed if get stuck). I removed the compression hose and the fitting was stuck in the head!!!!!!! I figured I put a some locktite and thread the hose back in and the fitting will come out...no luck. I wasted 4 hours trying to remove the adapter fitting. About this time I wanted to set the car on fire.
I finally removed it with some long needle nose pliers and some cussing. Also in the process of removing the adapter fitting for the compression tester, I noticed a brass color in cylinder number 6 and guess what? I found a stuck compressor tester adapter fitting in cylinder number 6 from the previous owner!!!!!!!! He screwed back the spark plug into the adapter fitting from his compression tester!!!!
I immediately had false hope again thinking that was my cause of the low compression and misfire! for shits and giggles I hooked up my quality tester to number 6 and got 0...... feeling like sad again.
I assumed I had some bad rings but wanted to do a leak down test to verify. removed the schrader valve from my compression test hose and put about 40 psi of air in the cylinder at TDC on the compression stroke of number 6. WTF air was coming out of my exhaust!!! HOw could this be? I already inspected the valve springs!!
I proceeded to take the valve cover off again to double check and sure enough exhaust number 6 was cracked. It was so difficult to spot the first time, i glazed over it.
Lesson learned...buy yourself a usb camera to inpect the valve springs...the cam blocks most of what you can see.
If you decide to change the valve springs without removing the head, it is not too bad. MOst spring compressors will not fit because of the tight space of head... to do this, Compress your spring in a vise and use ty wraps to hold it in a compressed state. This will save you at least 8 hours alone.
Right now I am in the process of aligning the timing chain and cams back up and guess what!!!! there is no inspection hole or removable cover to verify TDC on the crank!!!! I have to rip apart the whole front and oil pan just to remove the cast timing cover!!!
Anyone know a easier way? This is going to add another 10 hours to my project.
-
I have a 2010 Genesis sedan 4.6 with 117000 miles. I bought it used with the owner stating a misfire. I did my research and found that the worse possible scenario would be a broken valve spring that many other genesis owners were having. Long story short, i did take the plunge in purchasing the vehicle at a really good price.
Im going to try to document the trouble shooting i did and in what order.
Engine codes were:
p0306 misfire #6
p0308 misfire #8
p0304 Misfire #4
p0300 Multiple misfire detected
-Pull spark plugs to check for condition of combustion.
-6 and 8 were a bit wet others were dry (I assumed no combustion)
-check coil pack resistance I believe .8 ohms (i bought 4 used ones for 60 bucks just in case)
-I pulled the valve cover and inspected all the valve springs and l could see any issues
I put everything back with the new coils and guess what, still misfiring. I was pretty irritated at this point because I had about 5 hours into the project. My next plan of attack was to buy a compression tester. I should of did a compression test from the start. I figured I buy a cheap Chinese compression tester from craigslist because I am only going to use it sparsely . Hook it up, tested compression in 2,4,6,8 cylinders and got really low numbers, with number 6 being 0. It was not holding any compression on the gauge. I immediately assume my engine was toast and I should start looking for a replacement. DId some researching and it would cost about 2000 to 2500 for a replacement.
Something didn't sit well with me because the car had decent power after 2500 rpm but just ran really rough. So I took a look at the cheap chinese compression tester and I noticed it did not have a schrader(spelling) valve. It used a plunger with a o ring. So I head down to my local parts store and decided to purchase a decent tester from bosch. Tested it and now I was getting normal readings except for number 6 cylinder with a reading of zero. Lesson learned, don't buy a cheap tester especially one with the conversion fitting that is not a hex(easily removed if get stuck). I removed the compression hose and the fitting was stuck in the head!!!!!!! I figured I put a some locktite and thread the hose back in and the fitting will come out...no luck. I wasted 4 hours trying to remove the adapter fitting. About this time I wanted to set the car on fire.
I finally removed it with some long needle nose pliers and some cussing. Also in the process of removing the adapter fitting for the compression tester, I noticed a brass color in cylinder number 6 and guess what? I found a stuck compressor tester adapter fitting in cylinder number 6 from the previous owner!!!!!!!! He screwed back the spark plug into the adapter fitting from his compression tester!!!! I immediately had false hope again thinking that was my cause of the low compression and misfire! for shits and giggles I hooked up my quality tester to number 6 and got 0...... feeling like sad again.
I assumed I had some bad rings but wanted to do a leak down test to verify. removed the schrader valve from my compression test hose and put about 40 psi of air in the cylinder at TDC on the compression stroke of number 6. WTF air was coming out of my exhaust!!! HOw could this be? I already inspected the valve springs!!
I proceeded to take the valve cover off again to double check and sure enough exhaust number 6 was cracked. It was so difficult to spot the first time, i glazed over it.
Lesson learned...buy yourself a usb camera to inpect the valve springs...the cam blocks most of what you can see.
If you decide to change the valve springs without removing the head, it is not too bad. MOst spring compressors will not fit because of the tight space of head... to do this, Compress your spring in a vise and use ty wraps to hold it in a compressed state. This will save you at least 8 hours alone.
Right now I am in the process of aligning the timing chain and cams back up and guess what!!!! there is no inspection hole or removable cover to verify TDC on the crank!!!! I have to rip apart the whole front and oil pan just to remove the cast timing cover!!!
Anyone know a easier way? This is going to add another 10 hours to my project.
-
