91las
15+ Year Contributor
- 30
- 1
- Mar 1, 2009
-
orem,
Utah
1st off sorry for the long post. Trying to add all the info prior to being asked. Trying to pass IM and figure out where it’s drinking oil.
I am stumped on where my oil consumption is coming from. Gen 1 4g63 NA with roughly 20,000 miles on the top end. Adding 1 1/2 qts, roughly every 500 miles. Slight misfire felt. New plugs and wires, tried a coil with no difference. Tested ign module and is good. Dry and wet comp test shows decent. Dry: #1=181, 2=180, 3=185, 4=190.
Wet: #1=190, 2=205, 3=205, 4=219.
Some slight compromises there, but I have a hard time believing that is the source of consumption. Mostly smokes after a long sit and now getting worse after it sits for 12 hrs or so.
Not seeing evidence of blow by, fresh pcv. Air filter clean.
Leaning towards valve stem seals but with the low mileage on the head and proper maintenance, makes me think more than a few times on that being the faulter. Thought of doing a leak down test and filling valve cavities with oil or soapy water (under the valve cover) and watching for some bubbles. This seems like a far stretch to me.
Thank you in advance! Very much appreciated! Trying to get it through emissions. HC’s are roughly 315 on high and low speed tests. Have a top notch cat and working O2 sens, coolant temp sens, ign timing correct, windings are good in the injectors. I did have the injectors cleaned and flow tested. PCM sent off 2 yrs ago for injector caps. Did recently replace all the small vacuum lines and pretty damn certain the lines are placed correctly.
Thanks again!!!
I am stumped on where my oil consumption is coming from. Gen 1 4g63 NA with roughly 20,000 miles on the top end. Adding 1 1/2 qts, roughly every 500 miles. Slight misfire felt. New plugs and wires, tried a coil with no difference. Tested ign module and is good. Dry and wet comp test shows decent. Dry: #1=181, 2=180, 3=185, 4=190.
Wet: #1=190, 2=205, 3=205, 4=219.
Some slight compromises there, but I have a hard time believing that is the source of consumption. Mostly smokes after a long sit and now getting worse after it sits for 12 hrs or so.
Not seeing evidence of blow by, fresh pcv. Air filter clean.
Leaning towards valve stem seals but with the low mileage on the head and proper maintenance, makes me think more than a few times on that being the faulter. Thought of doing a leak down test and filling valve cavities with oil or soapy water (under the valve cover) and watching for some bubbles. This seems like a far stretch to me.
Thank you in advance! Very much appreciated! Trying to get it through emissions. HC’s are roughly 315 on high and low speed tests. Have a top notch cat and working O2 sens, coolant temp sens, ign timing correct, windings are good in the injectors. I did have the injectors cleaned and flow tested. PCM sent off 2 yrs ago for injector caps. Did recently replace all the small vacuum lines and pretty damn certain the lines are placed correctly.
Thanks again!!!