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Showing results for tags 'compression'.
Found 4 results
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Hey Gang, I'm driving a 2001 GMC Sierra 1500 with a 4.8L V8. Looking for a little bit of help with a Compression diagnoses. Info is as follows; Compression - 115 - 8 7 - 110 110 - 6 5 - 95 120 - 4 3 - 115 115 - 2 1 - 95 Its not Burning oil, burns a bit of coolant but nothing noticeable out of the exhaust and the coolant doesn't look contaminated. there a slight knock/tic when i start from cold but only for the first couple seconds. No drivability issues but she does burn gas pretty decent of late. Had a misfire issues a few years back and replaced all the injectors not sure if that caused any damage. Theres a slight leak in the exhaust manifold. Otherwise it's runs great. Was thinking of doing the head gaskets and valve cover gaskets and having a look while i was in there but i was hoping to get a few educated guesses to what i might keep my eyes open for. Thanks in advanced.
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I have a 2007 2500hd with the 6.0l. Driving home the other day the oil cooler line at the top of radiator blew off. Truck shut down immediately. Now that lines have been replaced, truck wont start. Timing chain and tensioner are good. Appear to have no compression in cyl. 1. While trying to start if I hold it to the floor it will backfire. This truck ran great with no knocking before all this happened.
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Hey all, I can't seem to reliably find the compression on my '14 5.3L. I'm trying to nail this down because I'm quite curious about the fuel debate. I know there are a lot of opinions out there regarding which octane you should use, if it's better for the engine, better for mileage, etc, etc. Well, opinions shouldn't matter here, right? Based on the compression of the motor we should be able to do some basic math and figure out if a higher octane is even being fully burned or not. Maybe I'm off here...but maybe I'm not! Weigh in! -Evan
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im new to the site, im nick i drive a 2002 silverado 4.8L 2wd step side mileage 240k dont tell me to sell or junk my truck the truck has been kept up with pretty well. In the mornings or after the tuck has been sitting a while i will get a pretty noticable ticking for about 30 seconds at startup until the engine warms up, i also get kind of a cough up of white smoke out the pipe at the same time, both of these symptoms go away after about 30 seconds. the truck will drive normal and strong until the first time i have to gas it into traffic or an incline/boat ramp, pretty much anytime i get into the gas pretty hard i get the loud ticking and smoke with a big sluggesh power loss at the same time. things to note- about once every 2 weeks i get a low oil light, i check the stick and its bone dry...heres where it gets funky, if i add only about a quart and a half the stick reads alost an entire half inch PAST full on the stick, so from bone dry to over full with a quart and a half????? No, there is no oil stains on my driveway no coolant in my oil or vice versa it is the oem factory dip stick i did a compression check, all the chambers on the drivers side are even at 140 in all cylinders, all chambers in passenger side are at 170 exept one was 180, im not worried about the pressure changes from that 10psi on the passenger side of the motor but what i do find strange is how one entire side is lower by about 30psi than the other head, warped head? head gasket? the plugs did look a little white corrosive and a few inparticular had a bit of carbon build up on them i took my valve covers off and inspected the lifters checked all the oil passages that i could see from there, no sludge or anything to note, brand new valve cover gaskets, no visible leaks from the exterior of the engine were could all this oil be going, it doesnt seem to be enough smoke in the orning or while im hitting the gas hard to be burning that much oil? could a cracked or bad valve seat be the culpret? im starting to get frustrated and how the heck can it go from empty to full with 1 1/2 quart??? ive tried this while hot and cooled down, always on level ground... im sure whatever is going on with the oil loss is the culprit for the ticking and smoke, I just cant seem to figure it out any help would be appreciated
