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Re start cat c12 after fuel run out - Cars & Trucks

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98GMC1500:my catalytic converter is clogged but it won't start Basically I'm trying to see if I have more then one problem Battery is good and I don't think its the altinator It turns over,won't start


If the cat is plugged up, the truck won't start. You can unbolt the cat from the exhaust manifold and see if it starts. Just run a few seconds, as running that way can crack valves if they get hot enough, but running a few seconds won't do it, plus it will be loud as sin. That will allow you to see if that is the issue. An engine can't breathe with a plugged cat and won't start. If the cat is the issue, be sure to correct why it is plugged before spending all that money on a new one. Running rich, burning oil or antifreeze will cause a cat to fail.

Feb 20, 2017 | GMC Sierra 1500 Cars & Trucks

1 Answer

99 f250 v10 auto 4x4-cat converter imploded,


The fuel pressure sounds too low. Is it multi-port injection? Check the fuel pressure against your specs for the car and engine. MPFI systems usually require 40-50 psi.

Apr 16, 2013 | 1999 Ford F350 Regular Cab

1 Answer

Not running


could it be the fuel cut off switch or the cats are going have you run cheap fuel in it. it kills the cats

Jan 04, 2012 | 1994 GMC Jimmy

1 Answer

Truck was running and was in parked and it just cut off and will not start back up. can this be my EGR VALVE or my cat or fuel pump ?


This sounds more like the fuel pump. EGR and Cat give warning signs. BUT before you run out and buy a new fuel pump. FIRST check any and all fuses to see if you may have just a blown fuse. NEXT:: Try squirting some fuel down the intake or use a starting fluid spray if she starts you are on the right tract for a bad fuel pump. If she does fire up on the spray and you have no blown fuses then it may be time for the fuel pump RnR. Hope this helps FixYa up.

Sep 11, 2011 | 1996 Chevrolet K1500

1 Answer

02 Olds Bravada all wheel drive 6 cylinder. Starts but wont run. It sputters and then shuts off. It just started doing this. Wife came home yesterday and said the check engine light just cam on and the...


Check the plugs and see if they have fuel on them if not check the catalytic converter it could be plugged and putting back pressure on the engine and not allowing the fuel into the cylinders. Can you spray fuel into the throttle body and get it to run. If so you may have a fuel pump problem or fuel filter issue. I am betting on the cat. you can pull the o2 sensor ahead of the cat and the engine should run if it is plugged. It will run rough but at least it should start.

Jun 23, 2017 | 2002 Oldsmobile Bravada

1 Answer

Hello. my 2000 4runner v6 has been running rough. when i start it, it runs fine untill it warms up. then it begins to miss. have replaced spark plugs, and battery but didn`t make a difference. diagnostic...


Change your oxygen sensors - they're responsible for feedback that the computer uses to determine the air/fuel mixture. They usually are good for about 60k miles and then start to go downhill. When they get to a point that the computer won't trust them, it ignores them and runs on preprogrammed fuel maps that run excessively rich (too much fuel) to safeguard the engine. You've probably seen a decrease in fuel mileage as well. And the O2 sensors have to be up around 900 degrees before they'll work - the car ignores them until then. That's why you run fine after a cold start but run rough once the car is warmed up.

The O2 sensors you want to change are in the exhaust system between the engine and catalytic converters (the "pre-cat" sensors). There are O2 sensors after the cats as well, but those are used comparatively to determine how well the cats are functioning. The primaries are the ones used for fuel mixture. If it's been this way for a few weeks or so, I'd put new spark plugs in as well - rich fuel conditions can foul them and contribute to the rough running.

Dec 09, 2009 | 2000 Toyota 4Runner

3 Answers

I have a 1996 ford crown vick that will not start


Not likly. There are O2 senors typically infront and behind the cat. they send messages to the computer to regulate fuel and air mixtures but even if they go bad your car should still start it may run like **** but it still runs.

Sep 15, 2009 | 1996 Ford Crown Victoria

3 Answers

Runs good when it's cold, warm it chokes and dies


sound like the catalytic converter is going bad or is bad,take out the oxygen sensor before the converter and see if it runs better. if you need more help get back to me please rate my fix

Jul 24, 2009 | 1989 Oldsmobile Cutlass Ciera

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