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Car hesitates while driving suspect catalytic converter

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You can pull the cat and knockout obstructions if thats what you think it is but hesitation is usually carbon or dirt buildup in fuel system or air intake side with failing ignition parts and older fuel pumps and clogged fuel filters.

Posted on May 08, 2010


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Hard to start. Also, feels like vapor locking. Stalls while running or driving.

If the car runs for a while and then stalls you should suspect that internal parts of the catalytic converter are lodging themselves in the exaust pipe between the first catalytic converter and the second or between the second converter and the exhaust pipe muffler. When the catalyst chunks partially block the hole the car will stall. To test, try opening the exhaust after the first converter just enough to make it really loud and try driving it to see if the problem disappears. If it does you will have to remove pipe sections until you find the catalyst chunks and remove them.

Feb 14, 2017 | Mercury Cars & Trucks

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I have a 2002 Dodge Stratus 3.0, when accelerating the engine chugs and engine light flashes. I heard it's a bad catalytic converter, is this true?

A plugged converter will cause a NO power situation where the vehicle is unable to expell exhaust gasses and cause poor acceleration. A flashing engine light is the result of a misfire. ( spark plug/coil/injector/wiring ). The engine should still be able to accelerate but will have a noticeable hesitation while doing so

Jul 09, 2015 | Dodge Cars & Trucks

1 Answer

For a grand marquis what would make you lose power driving down the road

could be a bad catalytic converter. check to see if you have 20 inches of vacuum. a bad converter will lose vacuum less than 20 suspect the converter

Apr 16, 2015 | Mercury Grand Marquis Cars & Trucks

2 Answers

Hi, so the problem with my car is that my check engine light lid up while I was driving. I took it to the mechanic next day and he told me that the code reader is reading emission problem and I should get...

Toyotas' are not known for cat.converters going bad. I would get a second opinion from another shop. (and don't mention what the first guy recommended) Have them do the scan and see what they conclude, 76 has good gas, I suspect you have bad mechanic..

Jan 06, 2011 | 2003 Toyota Corolla

1 Answer

Trouble code po430 what does this mean? also car sputters or hesitates when drivng runs smooth at idle ?

This code means the Catalytic converter on bank 2 is not working efficiently. If your car is acting up with hesitation the Catalytic may be getting fouled by the way the engine is running. There may be another Code to read for the problem that caused the Catalytic converter to foul.

You have between 25 and 35 Startups before a Code is erased. Consider the Code 430 as the last Code recorded and the other Codes were beyond the 25 to 35 Startup limit.

You have several choices. (Autozone and Oreillys give free scans) There are fuel additives which claim to clean the fuel system and Catalytic converters. You can have the car put on a better machine at a Dealer to find the cause of the hesitation. BUT tell them you want the type of test for cylinder balance and timing issues, not just Code numbers.

Once you restore the engine to Specs, the Catalytic converter may clean itself over time.

Nov 14, 2010 | 2000 Mercury Grand Marquis

1 Answer

2004 Chevy trail blazer hesitating while driving, and check engine light blinking.

Since the Check Engine Light (CEL) is blinking, it is indicating a serious failure condition. You need to have the car scanned for fault codes to determine the failure. Do not drive much longer with this condition, you will damage the catalytic converter.

Oct 10, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Hesitance while driving. The engine will go off. When it is turned on again it seems fine but it will shut off again later.

do you do alot of in town driving? It could be that your catalytic converter is getting plugged up.

Dec 24, 2009 | 1999 Chevrolet Venture

1 Answer

1993 buick park ave will not change gears

Have your Catalytic Converter checked for free flow, (if it is stopped up with calcification from unspent fuel, then the car will have trouble moving at all). A tell tale sign of oncoming Catalytic Converter problems is the overdrive balking or wanting to hesitate, when the transmission is in overdrive the vehicle is running at its lowest r.p.m. and so like at idle it will stumble or hesitate, or cut the engine altogeter, for the motor has to be able to exhale, to exhaust its combustion gases, in order to run properly, stopped up catalytic converters are a big problem with this car.

Apr 16, 2009 | 1993 Buick Park Avenue

1 Answer

Downshift hesitation?

Sounds like a plugged catalytic converter or in rare cases muffler. This will set codes but try this; remove O2 sensor closest to front of catalytic converter, it will be noisy but drive again, if performance is better, suspect plugged catalytic converter,replace cat and reinstall O2. Also check air filter and mas air flow sensor. Have had some luck carefully cleaning sensor with throttle body/air intake cleaner after removing from vehicle with key off. Hope this helps ! Rate me please.

Jan 18, 2009 | 1999 Chevrolet Tahoe

1 Answer

Loss of power with hesitation

Is your check engine light on? If so have someone run a diagnostic scan to try and pinpoint the culprit. This could be caused by any number of ignition/emission/ or fuel system problems such as filters, sensors,plugs,etc. If I had to guess than I'd check the EGR valve system and possibly the O2 sensors. A "clogged" catalytic converter would suggest this. Did you notice a rotten egg like smell from the car. Converters usually rust away these days...

Jul 03, 2008 | 1995 Ford Probe

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