Heres one for all you auto guru's out there... im asking again... I have a 1994 Chevy C1500 with around 152,000 miles on it... and when i get in to drive it... after the water climbs over 110 degrees (dont know what this has to do with the engine other than cooling the components) its starts tapping, press on the gas... gets louder and faster... sounds like a piston slap or rod knocking but as i drive longer it cuts off and on during the drive... be going along and itll quit ticking/tapping/knocking.... then back on... anyone with info or suggestions, I welcome you to help me out here... cause this is worrying me, i dont have the money to completely overhaul or anything like that... but if its a simple fix or something...
P.S. Ive narrowed it down to the driver side, rear of block... possibly something behind the block, ive never been able to get back there with my truck sittin like it does... Please, any help is appreciate it
2007-01-18 17:35:39 · 14 answers · asked by cporterfield20062 2 in Cars & Transportation ➔ Maintenance & Repairs
Probably a lifter trying to collapse, try running some engine flush and do a few close oil changes, it may help.
2007-01-18 17:42:45 · answer #1 · answered by misc 75 3 · 0⤊ 0⤋
Without hearing the knock I can venture a couple of guesses. First, possible a spark knock issue. Try running a tank of premium fuel, if you are getting spark knock, it should disappear with the higher octane fuel.
Second, you have a lifter bleeding down, loose rocker arm, worn camshaft lobe.
Third, indeed it is a connecting rod tapping away. Open the hood, put the truck in gear, stand firmly on the brakes and tip into the throttle enough to load up the engine. If it's a rod knock, it should start knocking loudly. If the knock increases, disconnect a single spark plug and repeat. Reconnect the plug and try another. Once you find the offending cylinder, the knock will be distinctly quieter.
Note: if you can lift the engine enough to clear out the oil pan, you will be able to replace the rod bearings without dropping the crank out. This is a bit of a pain, but FAR cheaper than paying for a rebuild. Rent a cherry picker and have one of your buds give you a hand. It's really pretty straight forward, just a bit time consuming.
2007-01-18 17:52:29 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I'm not able to say for sure the problem, but a way to hear better where it is would be easy. Simply take a big screwdriver and put the head of it at the engine. Then put your ear to the handle of it. It will act as a stethiscope for you to locate the place of origan. If it is loudest on the valve cover then you may be looking at lifters, pushrods(if equipt), or rockerarms as the source. Each of which wouldn't be too bad in the costs.
2007-01-18 18:14:32 · answer #3 · answered by D.W. 2 · 0⤊ 0⤋
This is a guess but it sounds(I'm blind so everything "sounds the same") like poor oil circulation through the oil ports at the rear of the engine. Do you have good oil pressure? Your engine oil system might need a proper flush. This will help upper end bearings and lifters. On one occasion, I found a frost plug out of place and touching the flywheel, but also there was a large coolant leak.
Sorry, not blind but can't hear through the net.
2007-01-18 17:56:50 · answer #4 · answered by Lab 7 · 0⤊ 0⤋
go to the auto parts store and get a quart of marvel mystery oil, 4 quarts of 10 w 30, and a filter. change the oil and repeat in 3,000 miles. it should do it, and won't hurt if it doesn't. marvel is a penetrating oil and is safer than a 'flush' product. it will clean out the carbon in the rings, and crud in the lifters. it's small spaces that it gets into and works junk out. i did a chevy 250 that couldn't go on the highway without blowing a quart every 25 miles. after 2 treatments, it went to florida on a quart, from connecticut. 1,500 miles on a quart, no smoke, no taps anymore either. good luck.
2007-01-18 18:00:57 · answer #5 · answered by car dude 5 · 0⤊ 0⤋
I just had that very same problem with my 1977 Lincoln. Your engine is worn out. You need to rebuild it or get a factory re manufactured one. Until then I suggest putting oil in it and check it once every 2 weeks. The sound you are hearing is your bearings and rodes are knocking together. They need oil to properly lube them. Also it wouldn't be a bad idea to replace your oil pump either.
2007-01-23 06:59:28 · answer #6 · answered by Christopher G 2 · 0⤊ 0⤋
Howdy
Have Mr goodwrench check your spark knock box
it is an electronic controls spark knock by timing adjustment
kenny m
2007-01-26 11:43:24 · answer #7 · answered by kenny m 2 · 0⤊ 0⤋
sounds like you may have a rocker arm that is loose, or either a bent push rod. Pull the valve cover and check the rockers, and bump the crank over check intake and exhaust valve movement..you might also have dropped a valve..run compression test on cyclinders....you might want to check your flywheel, you could have a bolt that has came out and is bouncing around..
2007-01-18 17:52:25 · answer #8 · answered by gotspeed7883 3 · 0⤊ 2⤋
drop inspection cover on trans and check torque conv. bolts,and look at flywheel near the bolts at crank for crack.good chance you'll find the problem.no need to drop exhaust, just GENTLY tap insp. cvr. to driver side w/hammer.you'll gain enough room to see
2007-01-25 15:00:32 · answer #9 · answered by JUNKYARD 2 · 0⤊ 0⤋
If it's an intermittent noise, it's not the lower end but likely a lifter.
2007-01-25 05:19:08 · answer #10 · answered by Anonymous · 0⤊ 0⤋