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No Power or acceleration but runs smoothly .Plugs,filters and exhaust replaced.Good engine.Brakes not binding.No oil consumption.Feels like a 1K cc engine

When folk say the exhaust has been replaced they usually mean a part of the exhaust has been changed, or two parts or even three but rarely do they mean the whole thing has been changed including the cat.
It is not unusual for a cat to become partially blocked and reduce performance.

A restriction to exhaust gas flow is quite distinctive because engines start and run fairly normally and seem to have nothing wrong whatsoever but performance is poor.

I suggest that is worth looking into...

Apr 28, 2016 | Cars & Trucks

1 Answer

Niian 350z exhaust gas from oil filler cap

check the pcv valve is operational

Feb 16, 2014 | Nissan Cars & Trucks

1 Answer

Uses 1quart of oil every 1200miles the oil is clean the coolent is free of oil and holding its level the cat on the exhaust is bad and needs to be replaced i am finding oil on the drivers side on the

Hi Alvin, Take a good look at the engine both from the top and underneath. Look for any wet places. The most likely areas of interest should be the tappet covers, the front and rear crankshaft oil seals, the camshaft oil seals and check the PCV system. Where you see signs of leakage that will be the areas requiring work. If it's around the lower front end, it will most likely be the front crank shaft seal or the camshaft seal and so on. And yes get the cat replaced if its defective. Regards John

Oct 27, 2012 | Dodge Cars & Trucks

1 Answer

My engine management light keeps coming on on my Rav4 (2001) I have had 2 sensors changed - and a new cat - but the fault codes keep saying it is the cat - please help!

The ECU is reporting the cat error code because the O2 sensor(s) outputs are telling it so. This MIGHT be the O2 sensor(s). You say two sensors have been changed, If these were the O2 sensors, then there is another engine issue to fixed.

The usual reason is that the engine is passing excess hydrocarbons into the exhaust, typically because its burning oil due to exhaust valve guide wear or/and worn valve stem seals. For a 2001, you've probably done around 200,000 km, so valve guide wear is likely. A head recondition is the only cure if this is the case. If you see blue smoke on starting, that's burning oil.

Related issue is worn piston rings: also causes excessive oil consumption.

Another problem is leaking (ie dirty) injectors. Most garages can clean them.

Another problem is the engine is running too lean. This can be caused by a dirty air cleaner or any number of other issues.


Sep 16, 2011 | 2004 Toyota RAV4

2 Answers

Missing on passenger side of engine. Gas floods through and comes out exhaust. Replaced fuel pressure change. Checked compression on all cylinders.120 - 190 psi. Dropped exhaust at engine,no...

Its possible that your crankcase is full of gass too, I suggest change oil and filter, also, if it wont go over 40, the converter (catalytic) is probably damaged as well, raw fuel in the exhaust will break up the cat. Oil change is imperitive as too much liquid in the crankcase will destroy an engine in seconds. Can also be caused by the clogged converter, too much backpressure.

Get a vacuum gauge, hook into a manifold vacuum source. Increase RPM to 1500-200 and hold steady, if vacuum gauge falls, exhaust sytem has a restriction, the cat or muffler or a pipe has a broken chunk of the cat blocking it.

Hope helps; keep us updated.

May 29, 2011 | 1990 Subaru Legacy

2 Answers

Vauxall zaffira petrol engine 1.6...put to much oil in engine,got it drained and refilled about 4 days later,was told it would stop smoking after a couple of days which it did,cars performance is no where...

may take about 100 miles before things get back to normal,if the plugs got oiled,try adding petrol additive(injector cleaner)in 5 gallons of petrol and you may be suprised how much smoke you kick out...(oil in exhaust system).

Jan 09, 2011 | Volkswagen New Passat Cars & Trucks

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Hi I traded a 92 Dodge Dakota with trans. problems for a 99 Ford Ranger that throws alot of smoke. Do you think it is the motor or cens. in the cat.

Your cat won't cause your vehicle to smoke, unless there is oil on it, then as the exhaust warms up, the cat will burn off the oil. Chances are, there is something wrong with your engine.

There are a few diagnostic steps you can make to see if you're burning oil, running rich, or have a leaking head gasket:

Check your plugs. If they've got oil or a filmy, soot-like deposit, you've got worn valve guide seals or worn rings, and you're burning oil, or you're running rich, indicative of other problems.

The exhaust "smoke" that you see, if it's like a white/gray cloud, could be steam from a leaking head gasket or water in the intake. If it's blue-ish, that's normally running rich. If it's black, you're probably burning oil.

Jun 27, 2010 | 1999 Ford Ranger SuperCab

2 Answers

Have 2003 Nissan Pathfinder. Engine rattles under acceleration.

I would have to hear it. may be the engine mounts.

Nov 27, 2009 | 2005 Nissan Pathfinder

3 Answers

To much oil was put in truck and now were told

To diagnos the catalytic converter, remove exhaust Y pipe from exhaust manifolds and start up. If engine runs goood and revs up, then suspect a restriction in your exhaust. Exhaust shop should be able to fix the problem. Cannot repair the cat converter. It is a honeycomb of metals inside that superheat the exhaust and burn off any unburnt fuel. When the honeycomb melts from contamination then it blocks exhaust air flow.

Mar 11, 2009 | 1998 Dodge Ram 1500 4WD

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