Question about 1999 Dodge Caravan

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When cold start engine bearing noise. after intial cold start is ok. 3.8 engine . could it be oil pump ?

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If it was the oil pump the warning light on the dash would illuminate so I would say the connecting rod bearing are worn and need to be replaced the bearings themselves are inexpensive but doing the job requires the oil pan to be removed and it can be quite labor intesive, and as we know expensive rymes with intensive. If you can do the job yourself you with save a lot of money but I wouldn't recommend it.

Posted on Oct 05, 2009

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2 Answers

Ticking sound upon acceleration. worse when cold


When you start the car with cold engine the oil light indicator is on even after the engine started?
If the sound comes from the engine itself you could check the oil level with cold engine before start.
If oil level is ok ( between low and maximum marks on the dipstick ) then could be 3 posible causes:
1. Bad oil
2. Faulty oil pump
3. Worn camshaft bearing, worn crankshaft bearing, or faulty piston bolt.
It may help if you bring on some more details like since when is making that noise, in what circumstances appeared and so on.

Mar 13, 2014 | 2001 Jeep Grand Cherokee

1 Answer

Bad oil pump ?


Turn your A/C off, the compressor can make noise if bearings are dry or system is low on compressor oil.
Remove your serpentine belt. Turn pulleys by hand to check for roughness. Bearings in those pulleys routinely go bad.
You may get computer warnings with the following test, but with serpentine belt removed, run engine for 2 or 3 minutes. Do this on a warm engine after serpentine belt is removed. The warm oil will not mask the problem like cold thick oil can. Noise generated means problem is internal.
If this is a stick shift transmission sometimes the clutch bearing can make noise and is a sign that bearing is bad.

May 13, 2013 | Ford Focus Cars & Trucks

1 Answer

Truck made loud noise while driving on freeway.once turned off ,would not start.we replaced starter and silonoid and a fuse that blew.truck started and ran fine until we took it on the freeway again 3 days...


Check this information about "engine noses"...

ENGINE CLICKING NOISES
A clicking or tapping noise that gets louder when you rev the engine is probably "tappet" or upper valvetrain noise caused by one of several things: low oil pressure, excessive valve lash, or worn or damaged parts.

First, check the engine dipstick to see if the oil level is low. If low, add oil to bring it back up to the full mark. Is the engine still noisy? Check your oil pressure. A low gauge reading (or oil warning light) would indicate a serious internal engine problem that is preventing normal oil pressure from reaching the upper valvetrain components. The cause might be a worn or damaged oil pump, a clogged oil pump pickup screen or a plugged up oil filter. Using too thick a viscosity of motor oil during cold weather can also slow down the flow of oil to the upper valvetrain, causing noise and wear.

COLLAPSED LIFTER NOISE
Worn, leaky or dirty lifters can also cause valvetrain noise. If oil delivery is restricted to the lifters (plugged oil galley or low oil pressure), the lifters won't "pump up" to take up the normal slack in the valvetrain. A "collapsed" lifter will then allow excessive valve lash and noise.

VALVE LASH NOISE
If you can rule out lubrication-related problems as a cause, the next step would be to remove the valve cover(s) and check valve lash. On older import engines, mechanical lifters require periodic valve lash adjustments (typically every 30,000 miles). Too much space between the tips of the rocker arms and valve stems can make the valvetrain noisy -- and possibly cause accelerated wear of both parts.

To measure (and adjust) valve lash, you need a feeler gauge. The gauge is slid between the tip of the valve stem and rocker arm (or the cam follower or the cam itself on overhead cam engines) when the piston is at top dead center (valve fully closed). Refer to a manual for the specified lash and adjustment procedure. Also, note whether the lash spec is for a hot or cold engine (this makes a big difference!).

On engines with hydraulic lifters, oil pressure pumps up the lifters when the engine is running to maintain zero lash in the valvetrain. This results in quiet operation. So if the rocker arms are clattering, it tells you something is amiss (bad lifter or worn or damaged parts) or the rocker arms need adjusting.

DAMAGED ENGINE PARTS NOISE
Inspect the valvetrain components. Excessive wear on the ends of the rocker arms, cam followers (overhead cam engines) and/or valve stems can open up the valve lash and cause noise. So too can a bent pushrod or a broken valve spring.

RAPPING OR DEEP KNOCKING ENGINE SOUND
Usually bad news. A deep rapping noise from the engine is usually "rod knock," a condition brought on by extreme bearing wear or damage. If the rod bearings are worn or loose enough to make a dull, hammering noise, you're driving on borrowed time. Sooner or later one of the bearings will fail, and when it does one of two things will happen: the bearing will seize and lock up the engine, or it will attempt to seize and break a rod. Either way your engine will suffer major damage and have to be rebuilt or replaced.

Bearing noise is not unusual in high mileage engines as well as those that have been neglected and have not had the oil and filter changed regularly. It can also be caused by low oil pressure, using too light a viscosity oil, oil breakdown, dirty oil or dirt in the crankcase, excessive blowby from worn rings and/or cylinders (gasoline dilutes and thins the oil), incorrect engine assembly (bearings too loose), loose or broken connecting rod bolts, or abusive driving.

Bearing wear can be checked by dropping the oil pan and inspecting the rod and main bearings. If the bearings are badly worn, damaged or loose, replacing the bearings may buy you some time. But if the bearings are badly worn or damaged, the crankshaft will probably have to be resurfaced - which means a complete engine overhaul or replacing the engine is the vehicle is worth the expense.

ENGINE PINGS OR KNOCKS WHEN ACCELERATING
The cause here may be Spark Knock (Detonation) caused by an inoperative EGR valve, overadvanced ignition timing, engine overheating, carbon buildup in the combustion chambers, or low octane fuel.

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Jun 05, 2012 | Cars & Trucks

1 Answer

Oil change then no oil?


oh my god what a mess,,, firstly when they dropped the pan they could not see any bearings without stripping further into the engine,,and even if they did all they can inspect are the big end bearings which are the bearings that the piston conrods run on,,,, they could not inspect the main bearings which the crankshaft runs on ,,,,also there are many more bearings and bushings that require lubrication in the engine,,,the bearings or bushs on the camshaft which are furthest from the oil pump could also be damaged and as they are the first usually to suffer from lack of oil this could be the problem, assuming that the lower bearings are ok ,,,either way i would get some legal advice because the costs involved are big and faulty workmanship on their part must make them responsible,,,,

Feb 11, 2012 | 2004 Dodge Stratus

2 Answers

Why would my oil press. be 3/4 up on guage all the time.cold starting little knoise fo 30 sec.


The weather you live in, oil weight being used, what type of car/truck. I'm thinking run an engine cleaner through for 5 min to clean the engine. What you are hearing is most likely a sticky valve. Drain the oil, change the filter and fill with a light oil in the cold with light loads and heavier oil in hot weather. A multi viscosity oil can be used to weigh out the cold and hot weather.

Sep 09, 2010 | Ford Excursion Cars & Trucks

2 Answers

How do you know there is a problem with the oil pump?


The oil pressure light or gauge will show that it has low oil pressure and you shouldn't run the engine that way.

Jul 12, 2010 | 2004 Suzuki Forenza

2 Answers

I have an Isuzu Rodeo 3.2 L when the engine is cold, motor sound good oil pressure is between 30 and 55 as it starts to get hotter oil pressure drops and the rocker arms start to rattle. When engine is...


The oil pressure in an engine will naturally drop off as the engine warms up. If the oil pressure is dropping too much it could be cause by several things. I don't know how many miles your engine has on it but the oil pump may be getting weak and may need to be replaced. Worn out cam bearings or crank bearings can also cause low oil pressure. Sounds like your engine may be ready for a rebuild

Jul 16, 2009 | 2002 Isuzu Rodeo

1 Answer

Loosing oil pressure after car is warm, thicker oil is not helping


Your problem unfortunately is bearing related. When any oil is cold (regardless of rating) it is heavier than hot. Therefore, cold, with marginal engine crankshaft bearings, you have less bleed off around the bearing faces. Once warmed up, the oil is thinner and prone to more bleed off, lowering pressure. Once pressure is low enough you will begin to hear lifter noise, later, bearing knock. If in the early stages of failure, replacing engine bearings is an option provided that only rod bearings are worn (can be generally done in car. If mains are involved, engine needs to be removed. Oil pump should be replaced during this repair...changing oil pump without repairing the bearings will not fix the problem.

May 19, 2009 | 1994 Ford Thunderbird

2 Answers

Noise engine


replace oil filter bypass (the boss that the oil filter screws to)... other than that ..oil pump failing...main bearings out of spec not allowing oil to stay under pressure and reach the upper valve train...good luck

Dec 12, 2008 | 2004 Chevrolet TrailBlazer

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