Over winter, I noticed a ticking noise in the engine on the first cold start of the day but would go away after 2-3 minutes. Over time it would get louder and last longer. Because oil changes seemed to help, mechanic thought it could be bad oil?? Now, 6 months later, getting louder and occurs on every start cold start. I have110,000 and getting plugs changed. Any suggestions for mechanic to look for?
Well my friend....i had the exact same problem in my 2006 HUMMER H3....thought it was a lifter on cold starts but it is not....its the exhaust manifold...it has a leak or cracked...either way, your gona have spend money to fix it...i am paying close to 1200 for this repair in the next few days....it will only get worse and your back presure will be affected thus your fuel milage will be real bad and getting worse...i too thought it was a lifter...but the shop has cleared that right up...not a lifter but a exhaust mmanifold
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COULD BE A HOT SPOT WHEN YOU SHUT IT OFF THE OIL BURNS OFF AND THE COLD START IS THE DRY LIFTER AND ROCKER CONTACT OR THAT SPRING IS WEAK UNTIL IT HEATS UP AND EXPANDS TO CLOSE THE GAP BETWEEN THE ROCKER AND THE VALVE STEM
Lifter noise(s) can be a combination of things........ 1. High mileage on engine. 2. Not using the correct oil. 3. Lots of sludge build up in motor due to lack of oil changes and the quality of oil that you are using. Hydraulic lifters rarely fail but it does happen, given the conditions on how the car was maintained. I can offer you a solution but no guarantees on what might quiet this lifter down. It's a 50/50 chance. On your next oil change, I would recommend taking your vehicle to a facility that sells BG products. It's a company that formulates chemicals that have great cleaning properties to your fuel system and oil lubricating systems in your engine and at the same time, it is safe on all rubber seals in your engine. (Especially Higher Milage Vehicles) Ask for BG MOA to be added in you next oil change or if you do your own oil changes, you can find this product on line and can purchase from there. What the BG MOA does, it helps break up sludge and build up on the inside of your engine and helps to free up your valves, piston rings and noisy lifter(s). Hydraulic lifter(s) tend to make noise when they can't sufficiently pump up with oil due to sludge and build up blocking the oil inlet passage. Worn lifters on cold start up may be very noticeable but eventually the ticking goes away after engine warms up and the hydraulic lifter(s) had time to pump up. Make sure that you don't have a exhaust manifold leaking as well due to a crack or a failing exhaust manifold gasket. This can also emit a ticking noise in which can be misdiagnosed for a ticking lifter. A leaking exhaust manifold can usually be identified by the ticking noise getting louder and faster when accelerating and quieter and slower when decelerating. Ticking noise is loud on cold start ups but not noticeable at all when engine is at operating temperature. Hope this will help you out.
If it goes away after the engine warms up it is likely loose pistons or worn piston skits. As long as it goes away after the engine is warm it won't hurt anything. It is common on engines with some age on them. When the engine get hot the pistons expand and the noise usually goes away.
I had what sounds like the exact same problem. It was an exhaust leak from the left (driver's) side exhaust manifold. This engine has a history of the manifold bolts breaking and causing the exhaust leak. The engine is also used on some Dodge vehicles. It sounds like a tick and I almost mistook it for a bad lifter. I took it to the local Jeep dealer who confirmed the exhaust leak. I replaced the left manifold completely and replaced bolts/gaskets on both sides (left/right) and it fixed the problem. Be careful, as the dealer tried to gouge me on the price. You are looking in the ball park of $600 parts/labor. I got parts for $120 and it took the better part of a work day to do the job.
Flashing check engine light is missfire, fuel pump probably causing multiple tries to start.Having to build fuel preasure,vac leak on one side of intake probably causing rich/lean condition.Also check back preasure to cat ,Sound like you are moving down right track.Mas air flow would probably set lean code bank1 and lean code bank2
usually when there is a ticking noise that changes as the rpm of the engine changes it could be that not all the components in the engine are properly lubricated. you may notice that noise occur temporarily when a car has been sitting for a while and all the oil runs to the bottom of the engine. as soon as the engine is running for a couple of seconds the noise goes away because oil is splashed on all those components. i recommend you check your oil level. i used to have a stealth with an oil leak...and i always knew when the oil was low because i would start to gradually hear the ticking noise. usually and hopefully that's it. it either that or you have bend rods that are slightly tappin on something else in there. but let's be a lil optimistic.