Question about 2003 Cadillac CTS

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135 cylinder is skipping, causing car to run rough. Been in shop for over a week, and problem cant be located. What could cause this. Car is a Cat ceso3 jim@tentbuilders.com

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Coil packs could be shot

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

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What is wrong with my 2004 mazda rx8. Cat. Converter was glowing red,running poorly & louder than normal. Changed cat & resinatorpipe but problem persists.


RAW FUEL IS ENTERING THE EXHAUST AND BURNING IN THE CAT. YOU MUST HAVE AN ENGINE MISFIRE ON ONE OR MORE CYLINDERS CAUSING THE SUPPLIED FUEL TO THE ENGINE NOT TO GET BURNED. I WOULD SUSPECT A BAD SPARK PLUG OR PLUG WIRE GIVING YOU TROUBLE AND CAUSING THE ENGINE TO RUN ROUGH AND ALSO CAUSING THE FUEL TO NOT GET BURNED IN THE CYLINDER

May 03, 2015 | 2004 Mazda RX-8

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Coolant ran out of the bottom of the car. Nechanic found hose leak. Car is running rough while sitting. Could it be a Gasket?


if you haven't had any coolant in your car for a week and you have been driving it you may have blown your head gasket, even though you haven't got 'milkey goo' on your oil dip stick. check for goo under your oil cap to see and have it tested at a garage. but from what ive read im almost certain its your head gasket. hope this helps you and beware of the dangers of a running engine so keep hands and loose clothing out of the way of moving parts and engines get very hot so be careful what you touch.

Feb 11, 2013 | Volvo S40 Cars & Trucks

1 Answer

Glowing Converter/ Muffler Noise/ Power Loss


your cat is plugged remove it and replace with straight pipe or replace cat

Apr 05, 2017 | 1994 Chevrolet Camaro

2 Answers

2003 mustang cylinder 2 misfire. I changed the spark plugs and wires. Its still have code p0302. What should I do next?


A code P0302 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Keep us updated.

Sep 06, 2011 | 2003 Ford Mustang

2 Answers

I have a 2007 Chrysler Sebring with a 2.4 engine. The check engine light came on and the car runs rough. Had the code checked and it came back with a 303, 302 and 300 codes. What is the most common...


Hello Frybird.

The codes you have are engine misfires.
Code 300 is random misfire (could be any cylinder).
Code 302 is cylinder #2 misfire and 303 cylinder 3 misfire.

Most common causes are ignition issues.
Spark plugs, ignition wires/boots and ignition coils.

Next would be fuel issues such as fuel injectors.
Next would be emission components such as EGR valves.
Then in a worst case condition would be engine wear parts (valves, camshafts etc.)

The place to begin is ignition as this is a common failure on most cars.

If you need further assistance regarding your question please ask me here in a comment.
Thank you for using FixYa.

KL

Feb 11, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

MY 98 STRATUS RUNS GREAT UNTILL I BRAKE AND THE RPMS DROP BELOW 800.THE CAR SHAKES AND WANTS TO DIE WHENEVER I NEED TO SLOW DOWN.


THE EGR VALVE MAY BE STICKING ..CAUSES A VACUUM LEAK AND ROUGH RUNNING AT LOWER SPEEDS..4 CYLINDER..LOCATED ON END OF CYLINDER HEAD ON LEFT SIDE OF VEHICLE..HAS METAL TUBE COMING FROM INTAKE..6 CYLINDER..LOCATED ON FRONT CYLINDER HEAD ON LEFT SIDE OF VEHICLE..NEAR RAD..HAVE SEEN THESE CAUSE PROBLEMS ON THESE VEHICLES..LET ME KNOW IF YOU NEED MORE INFO

Jan 01, 2010 | 1998 Dodge Stratus

1 Answer

Engine running very rough and exast under car very hot.


DISCONCT THE EHXAUST BEFORE THE CAT AND ROAD TEST.
A GLOWING CAT HAS MOST LIKELY FAILED.
BUT LOOK FOR OTHER PROBLEMS THE MAY HAVE CAUSED THE CAT TO FAIL.

Oct 21, 2009 | 1998 Ford Explorer

2 Answers

1998 k1500 o2 sensor rattle, truck runs rough. would that cause it to run rough?


If O2 sensor is bad it can cause Rough running. Are you sure it is the O2 sensor ratteling? Have you taken it out to hear Rattle? Is it loose? I have not Hears an O2 Sensor rattle. I have heard Converters Rattle. over time Inner Material of converter will Not have a tight fit due to heating and cooling. expanding and contracting. carses some of the material to wear away. Causing the it to rattle. and can cause rough running also.

Oct 09, 2009 | Chevrolet 1500 Cars & Trucks

2 Answers

Chevy Blazer P0303 and P0420


Most probably and if a cat is not flowing proper is causes back preasure that can result in sticking or burned vavles,mechanic not nice by saying ignore the cat effiency code p0420.Can ussually have cat replaced at aftermarket muffler shop for approx. $200 cheaper than valve job or excessive fuel that you have used and damage that may occur to your engine.

Jun 16, 2009 | 1999 Chevrolet Blazer

3 Answers

Catalytic converter still glowing red


When running does the engine shake back and forth (indicating a skip in the engine) also does it rev up freely. If you were to rev it up to 3500RPMS would it be smooth without the engine shaking back and forth? Also the o2 sensor on the front of the exhaust manifold is pretty easy to get at, if you were able to pull that( 7/8") wrench I beleive) you could tell if it were running rich (sooty black color). In the end you could take it to a muffler shop and for very little money have them inspect your cat, without any cutting or welding. a $20-$30 cost at most. I know the fixya wants us to be self suficiant but even i don't mess with small exhaust work because of the benieft of not dealing with it, especially for such a small price. But if its something you wanted to do, I could explain so. A shop can visually inspect the cat, and see if it is clogged with oil, or excessive fuel. At any rate in the end if they do find that you do need a cat, don't buy a GM one, there are plenty of other sources for an aftermarket cat. IF you decided to go that route i know of a few sources that one could be had for pretty cheap ($50-70) for new. Let me know if any of this helps

Sep 14, 2008 | 1996 Chevrolet Cavalier

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