Question about Pontiac Firebird

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Lifter is making loud tapping sound like rocker roller is hitting valve cover, and it squeals when I first start the car. This is a new reconditioned 455 pontiac trans am. 325 miles. is this serious or is it just an adjustment

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  • 455guy Jul 28, 2008

    clutch is good

  • 455guy Jul 28, 2008

    no I did not install it myself a shop did, I will call them, but it will be awhile I am sure before I can get it to them.

  • 455guy Jul 28, 2008

    thats sounds like a very intelligent solution, unfortunatly I am not that skilled, I really just need to know ."will the engine have to come out"

  • 455guy Jul 28, 2008

    its a loud lifter tapp like a thump on the valve cover

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Here is the truth if the lifter is gone no adjustments can be done they will have to be changed it will not do serious harm it will just go tick tick louder and louder the lifter can do this beacuse of to things ,,,its worn out or the oil pump is not pumping the oil up right ,,,,,,

Posted on Jul 28, 2008

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Valve cover must be removed to figure out what is wrong, turning engine manually.

Posted on Jul 28, 2008

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The squealing is probably the accessory drive belts need tightening,the lifter tapping could be you are using the wrong weight oil,or it could be a rocker arm nut has loosened.The weight of the oil should be 10w 30 or 10w40 if using the stock hydraulic,flat tappet camshaft.Using too heavy an oil,like 20w50 can cause the lifters to tap,and clack,and rattle.If the weight of the oil isnt the issue,then pulling the valve covers is pretty easy on that engine,so pull the valve covers,get the engine on Top Dead Center #1,and check the intake and exhaust rocker arms,they should not be loose,there should be tension on them so they are tight.Run through the firing order just as if you were going to adjust the valves,and check and be sure all the rocker arms are tight.With a camshaft that uses hydraulic lifters,they pump up with engine oil,and actually put a slight preload on the rocker arms,while automatically adjusting for any valvetrain wear.

Posted on Jul 28, 2008

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Yes, it could be very serious.
Did you put the motor in, or did a shop put it in for you?

If you believe it to be a lifter, it could be that it broke a rocker arm, or a loose wrist pin.

If you did the work, I would pull off the valve covers to diagnois the problem.
If a shop put it in, I would be on the phone to them first thing in the morning.

Posted on Jul 28, 2008

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Possible issue on the clutch lines, do you know what is the status of your clutch?

Posted on Jul 28, 2008

  • marlon john madrid
    marlon john madrid Jul 28, 2008

    did you get the car with new rings and pistons? because it really can be a serious issue starting with a loose bolt and once it will be removed and the materials its holding will come loose, then the rattling problem will be really serious, have it checked by a technician and piont out the ratling sound

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2 Answers

What's causing valve tapping?


Some tapping is normal with age and mileage. Wear on the cam and lifters and followers causes it.

Apr 08, 2016 | Cars & Trucks

2 Answers

Does this car take a valve lash adjustment and what are the settings


Your car has hydraulic lifters. Hydraulic lifters just means that it uses engine oil to control the valve clearances using a bucket and shim arrangement.
Here's a generic image of what a hydraulic lifter can look like:25949035-hsh3lir2aljnaf1jzrgt1uh1-5-0.jpg

If the car makes a tapping sound at start up, this points to a problem in the camshaft area - including the hydraulic lifers/shims. Valve clearances are controlled by the lifters and shims. It could also be a worn camshaft - the lobes can become rounded.

Usually, there is no adjustment possible with most hydraulic lifters. Replacement (usually) means you have to remove the camshaft, though I am by no means certain about your particular model.

If you have the tools and ability, remove the rocker cover and have a look at things.

25949035-hsh3lir2aljnaf1jzrgt1uh1-5-1.jpg The image above shows a camshaft - the lobe is worn and rounded. When this happens valve clearance is excessive and may lead to a tapping noise. Engine efficiency is also affected.

The image below shows hydraulic lifters (example only..).
The lifter on the left has a 'dished' surface - wear caused by the camshaft or the lifter not being able to 'turn' in its bore.
25949035-hsh3lir2aljnaf1jzrgt1uh1-5-3.jpg The usual cause of this is (a) short trips where the engine hasn't had a chance to warm up properly and pump oil to the camshaft area (b) poor oil/infrequent oil changes (c) stuck lifter.

Before you spend money on parts or repairs, first try adding some oil flush to the engine to clear out carbon and 'sticky' deposits.


25949035-hsh3lir2aljnaf1jzrgt1uh1-5-10.jpg
... follow the instructions on the bottle...
Then change your engine oil and add something like a 'valve train additive' - this will try and quieten the tapping noise.
The (Ebay) link below will give you an idea of what additives are available (and so will your local car accessory shop).

Try the cheapest and easiest first. If that doesn't work .. unless you are confident that you can inspect, diagnose and replace parts .. give a mobile mechanic a call. Those guys are usually quite good.

12results for camshaft additive

Nov 08, 2015 | 2004 Suzuki Forenza

1 Answer

I was quoted $500 to replace all the lifters. Is this a good price?


That is a ridiculously high price to replace lifters on a 4 or 6 cylinder engine. On the Mitsubishi 4 cylinder motor, the only thing that is needed to do is remove the valve cover and remove the rocker rod. (2 rods which hold the rocker assembly.) Next is remove the lifters from the bottoms of the rockers and pop in the new ones. Be sure to soak the new lifters in oil for 24-48hrs prior to install so they are pre-filled before install. Replace the rocker assembly and torque down to specs. replace valve cover and then start the vehicle. Check that there is no loud tapping noise and do not race the engine until the lifters have pumped up with engine oil. You should replace oil and filter for this engine work as well.

Apr 17, 2015 | 1994 Mitsubishi Mighty Max

1 Answer

Ok so ik I'm posting allot haha but does anyone know where or how to adjust lifters just found out mine r just now needed adjustment in near mount Vernon WA or a price at least haha


In engines with rocker arm valve systems, the procedure I'm familiar with is to remove a rocker arm cover, and (one at a time!) while the engine is running, slowly back off the rocker arm retainer nut or bolt just until you hear the lifter tapping, then tighten it a quarter turn. If you can identify a lifter that is already tapping, tighten its rocker arm slowly until it stops tapping, then adjust it. Do not over-tighten! This can damage the engine.

Listen carefully to how the engine sounds; if it starts to stumble when you tighten a loose rocker arm, you've gone too far. If you cannot get the engine to run well without tapping, you may have too much wear in the valve train and may be due for a head overhaul, or you don't have adequate oil pressure in the lifters in question.
Repeat until all rocker arms are done. Replace the rocker arm cover using a new gasket, then (in a V-engine), repeat the procedure on the other side of the engine.

Wearing safety goggles, or better yet, a transparent face shield, is strongly recommended. Sometimes oil will squirt out a considerable distance from the lifter side of the rocker arm during adjustment, and the direction is not readily predictable.

Apr 03, 2015 | Cars & Trucks

1 Answer

Lifter noise


yes they do wear out and will not hold oil pressure. I would be checking the pivot points of the rockers and the face of the rockers where they hit on the valve end. I say this because if the hydraulic tappets were so bad you would have very low oil pressure at idle.

Jun 25, 2013 | Chevrolet Cars & Trucks

1 Answer

Lifters sound loud on 2011 Ultra Classic


This car has hydraulic lifters( tappets} therefore should not adjustment, you probably have a bad or weak lifter. But, in any case you have to remove the valve covers to make the adjustment. You will see the adjustable bolt on the rocker arm. rotate the engine until the valve is all the way to the top, [no tension on the valve spring] then place a feeler Gage in between the rocker arm and the valve stem, adjust the rocker arm until the feeler Gage is snug but not tight. Do this with each valve. Check the book for the correct Gage to use but I think it is a .018.

Oct 05, 2012 | Cars & Trucks

1 Answer

2001 Sunfire 2.2L, Car started Noise seems to coming from top of Eng . Lifters is my guess, is there anything that would make similar noise, or that I should be checking, How can I be sure it is lifters?


You make have a bad or sticking lifter, remove the valve cover and have someone tap the key, make sure to disconnect the ignition coil to avoid the engine from starting, as they tap the key you will look for the valve to close, a good way is to watch the one next to it open, when the valve is open then you will know the other is closed as there are two valves per cylinder. with the valve closed grab rocker arm and see if theres a lot of play in the direction it moves if it does then look at rocker and push rod and if those are good then you have a bad lifter. if this engine use an overhead cam then there will be no rocker arms or push rods you will need to look for any worn lobes on cam, a stethiscope would be a good tool. start engine with cover off and listen to each cylinder and pin point noise, this will get a little messy as oil will be splashing out a little but its the best way to locate the noise. poor oil flow would cause this also or a loose timing chain. i would start at the top first and look inside cover. good day.

Jun 15, 2011 | 2001 Pontiac Sunfire

3 Answers

I have a loud ticking under my valve cover. 97 ford escort. I think its a loose valve but is it some thing i can fix. I know a little about cars. but not an expert


not a valve, but a lifter. I will paste procedure below. You judge if you can do it or not. Recommend you replace them all while you're in there. If you let this go, the lifter will wear out the camshaft. Lifters are $22 each, and you have 8 of them. You will also need a new valve cover gasket.
Please let me know if you have questions, and thanks for using FixYa.

2.0L Engine
SOHC engine
See Figures 6, 7, 8 and 9
  1. Disconnect the engine air cleaner-to-valve cover hose from the cover by compressing the hose clamp with pliers and sliding the clamp back, then separate the hose from the cover.
  2. Remove the spark plug wire separators from the valve cover and set the wire assemblies aside.
  3. Unfasten the three valve cover retaining bolts.
  4. Remove the valve cover and gasket from the cylinder head.
WARNING Do not use any abrasive grinding discs to remove gasket material. Use a plastic manual gasket scraper to remove the gasket residue. Be careful not to scratch or gouge the aluminum sealing surfaces when cleaning them.
  1. Remove the old gasket material from the cylinder head and valve cover mating surfaces.

jturcotte_163.jpg

Fig. Fig. 6: Remove the spark plug wire separators from the valve cover

jturcotte_164.jpg

Fig. Fig. 7: Compress the engine air cleaner-to-valve cover hose clamp with pliers, and slide the clamp back ...


jturcotte_165.jpg

Fig. Fig. 8: ... then disconnect the hose from the valve cover


jturcotte_166.jpg

Fig. Fig. 9: Unfasten the valve cover retainers and remove the valve cover-2.0L SOHC engine


If removing more than one valve lifter (tappet), mark the lifters and their locations as they must be installed in their original bores.

  1. Remove the rocker arm(s).
  2. Unfasten the lifter guide plate retainer.
  3. Remove the guide plate and the lifter.


To install:
  1. The oil feed hole in the lifter must face away from the oil feed hole in the cylinder head.
  2. Lubricate the lifter(s) with clean 5W-30 engine oil and install them in their original bores.

Make sure the lifter guide plate retainer tabs are towards the rear of the cylinder head, and the lifter guide plate tabs are towards the front of the cylinder head.
  1. Install the lifter guide plate and tighten the retainer.
  2. Install the rocker arms.
Do not use any sealer with a silicone type gasket.
  1. Install a new gasket and the valve cover.
  2. Install and tighten the valve cover retainers to 71-97 inch lbs. (8-11.5 Nm).
  3. Attach the spark plug wire separators to the cylinder head.
  4. Connect the engine air cleaner-to-valve cover hose and engage the hose clamp

Jan 19, 2011 | Ford Escort Cars & Trucks

1 Answer

98 TAHOE VORTEC 350 JUST REBUILT REPLACED EVERYTHING BUT CAM AND LIFTERS NOW IT HAS A LOUD LIFTER TAP AFTER IT WARMS UP.I WAS TOLD BY THE MACHINE SHOP THAT THESE ROLLER CAMS AND LIFTERS DONT WEAR OUT .I...


As far as I know all hydraulic lifters can go bad, collapes or stick. And yours are definately hydraulic lifters, rollered yes, which will make them more durable, but they can go bad. The machine shop should have down a leak-down test on the lifters. That is the only way to determine if the lifters are good. I would check that you have proper oil pressure, I'm sure you do. I bought a "rebuilt head" for a Saturn DOHC engine, and the machine shop never did a leak down test on the lifters, and I had the samething happening.

Mar 16, 2010 | 1998 Chevrolet Tahoe

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