OK, couple mornings ago when I fired up my daily ('99 GMC Jimmy) a terrible knocking sound from the motor suddenly appeared and disappeared within say 20-30 seconds. Tried to duplicate the later in the afternoon after letting the car sit all day but no knock. Next morning the knock came back and also disappeared 30 seconds later.
Yes the motor was full of newly installed oil. Decided to take it to my mechanic who said that per my description, it might be a lifter issue which could result into a cam issue. He kept it over the weekend and I was ready for some real bad news and a high quote to fix it, when he calls me saying "I fixed it, come down and pick it up"
I asked what was the problem and was thinking to myself (why didn't he call me with a quote first before doing all that work?).
He said after listening to the sound that maybe some junk was stuck on 1 or 2 of the lifters so he put a quart of automatic tranny oil in the motor, let it idle, drain the pan and put in new motor oil and filter. All fixed. He said since auto tranny oil is a cleanser, it was able to get up to the lifters and clean them. An old school trick.
I was extremely in total denial that this actually fixed it waiting for this morning to come along so I could fire it up myself. Went out and fired it up. No more knocking. Hopefully this little $155 trick didn't do any harm but hell, if it delays me having to replace the cam and lifters.....
WOW! :thu
Yes the motor was full of newly installed oil. Decided to take it to my mechanic who said that per my description, it might be a lifter issue which could result into a cam issue. He kept it over the weekend and I was ready for some real bad news and a high quote to fix it, when he calls me saying "I fixed it, come down and pick it up"
I asked what was the problem and was thinking to myself (why didn't he call me with a quote first before doing all that work?).
He said after listening to the sound that maybe some junk was stuck on 1 or 2 of the lifters so he put a quart of automatic tranny oil in the motor, let it idle, drain the pan and put in new motor oil and filter. All fixed. He said since auto tranny oil is a cleanser, it was able to get up to the lifters and clean them. An old school trick.
I was extremely in total denial that this actually fixed it waiting for this morning to come along so I could fire it up myself. Went out and fired it up. No more knocking. Hopefully this little $155 trick didn't do any harm but hell, if it delays me having to replace the cam and lifters.....
WOW! :thu
