90 C1500 engine problem...HELP!!!

[illlmikeilll]

your knock sensor wont make any noise, it only picks up noise. I would say either a pully if indeed it is a "clanging" noise or it might be a wrist pin or a bearing if you lost oil for some reason. First thing I would do is check the oil level. IF it is a bearing or a wrist pin or something... could be your oil pump. could be a counter weight on the crankshaft hittin on the engine block or oil pump due to a bad thrust bearing. Its really hard to say, but I dont think you should tackle any of that your self. the wrist pin needs to be pressed out at a shop, and is a bear to remove. and i would say that if you are goin to get that far into the motor, just do the whole lower half. Expect to spend a couple days if you have never done it before, i am not sure about your truck specificly but I know every time I have ever had to remove an oil pan post ohhh i dunno 70's model vehicles with out having to raise the engine several inches at the very least just to get the oil pan off. The job is dirty, smelly, can be bloody and makes you cuss alot. I have spent alot of my life turning wrenches, I absolutly hate 2 things...saturns and any thing that involves removing the oil pan. might wanna bite the bullet and go pay 65 bucks to have it diagnosed. If it is easy fix it, if not let them do it. You dont wanna spend 200 bucks and 3 days of cussing (remembering back to my very first time i did some main bearings soo many years ago) only to find out that even with plastigauge and a digital torque wrench you still tightened the main bearing caps up too much and there is way too much friction on the crank... you drive 20 miles and lock up the engine....now yer back where ya started at. and it was 3 solid days from sun up to sun down.... 15 years later, I did an oil pump on an acura legend about a year ago. still took me 2 and a half days... I dont mean any offense, but you dont really seem well versed in the art (yes it can be an art... look at my exhaust if ya dont believe me ) of automotive mechanics. I would never allow some one to believe they can do something that chances are is just going to be a waste of time, money and effort. Like I said I do not mean any offense at all by that statement, you might be a perfectly competent turner of the wrench. But realisticly at least in my mind I dont think you have the knowledge to look at things inside the motor. Sorry its the whole knock sensor thing, points, and what not. Try gettin under the truck and smash yer ear up against the oil pan and listen for a hollow knock. not unlike your knuckles hittin a counter, door, or table.. if the noise is louder from the bottom of yer truck call some one, at least a mechanicly inclined friend that has performed said procedure a few times even if it was on a honda. I know the ear on the oil pan sounds dirty and it prolly will be, but it is a quick easy way of listening to whats goin on inside the pan, on the bottom of the motor. I dunno if the screw driver would work too well on this one, cause yer already trying to hear something through 4 to 6 inches of oil with a loud fan not far away, and exaust making all kinds of noise. Im not saying that it is an impossiblity for you to do the job yourself. But if I knew then what I know now. I coulda saved myself ohhh i dunno prolly about 2000 dollars in total on my first job of this nature. I shoulda called my friend who worked at a dealership, and bribed him into showing me the ins and outs. Just a few words of caution. You could try the screw driver thing on the oil pan bolts because what you are listening to is the sound traveling though metal, first the part making the noise, then the block, then the oil pan screws, then the screw driver. I figure the less things that vibration has to travel through the better..... also try pullin out all the plugs and have some one crank the engine while you listen to it with a water hose or something at each spark plug hole.. other than the woosh of air if it is direcly related to the piston you might get lucky and hear it better that way. No promises there, never done it, but if I had no other ideas, ive tried sillier stuff in the past. the only real question I have is it a knock like on a door with knuckles, a tap like keys or a quarter on a metal surface, or is it a clang like a broken bell?

Mike

[crabtruck]

FWIW:
Robbman
Join Date: 11-08-2005
Last Activity: 11-17-2005
Total Posts 5

[illlmikeilll]

Dunno why i never look at dates on these things. lol. Ive been a member of all kinds of forums for years, and find myself doing alot of these sorts of things. Thanks haha that was a whole lot of typin maybe it will one day do someone some good. I read it and the replys and it reminded me of when I came to dodge truck forums for advise, and they all said oh no problem just get you a floor jack and some wooden blocks, you only need to raise the motor a couple inches........ If some one woulda said "son your prolly in way over yer head" I would have accepted it. Probably woulda had to figure out another way of earning a living after that... shoot back then I . didnt even know you were suposed to change the oil But if not for that instance I would have never even thought of the possibility that I could work on a vehicle in such a manner....I wonder how i came across that old post... i was lookin in new posts on the forum.