Question about 1998 Oldsmobile Bravada

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When I step on the gas you can hear the engine but it doesn't move . So i looked under the car while it was still running and i noticed the catalytic converter was glowing red

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Posably a pluged cat or you have a lean condition

Posted on Jan 31, 2010

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Posted on Jan 02, 2017

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1 Answer

Won"t stay running


Look for a loose or bad sparkplug wire. Use gloves and be careful of belts and fan. Move or wiggle the sparkplug wires while someone keeps the van running. If you notice a difference in the way it runs you probably have a bad wire. If it's been more that a couple of years since you changed sparkplugs and wires you should do that anyway. Some gas treatment and oil treatment might help too. You can also borrow a tester from most auto parts stores to hook up to obd2 port and you may get some information on ignition problems or other errors that might help pinpoint the problem. Check and see if the catalytic converter is clogged. You might want to put in a new gas line filter too. Those are just the most common causes of rough running engines.

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Ford five hundred running on 5 cylinders


the code p 0302 refers to no 2 cylinder misfiring===causes --engine mechanical fault ---wiring--ignition / fuel system---injector--ECT/Maf sensor ---ECM
you state that the engine runs normally for several seconds so I would eliminate a mechanical fault at this stage
most misfires are from faulty injectors so reposition the injector to another cylinder and see if the miss moves along as well
if it doesn't move but stays at no 2 cylinder , then it could be a problem ECM
if you can get a substitute ECM of known good performance , swap it out and see if that fixes the fault

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1 Answer

1997 ford aerostar


The catalytic converter may be coming apart inside - the loose catalyst could be moving around and intermittently blocking the exhaust. A malfunctioning Exhaust Gas Recirculation valve could also be part of the problem. Sometimes carbon buildup in the exhaust manifold can cause trouble, but usually this causes stalling upon acceleration after coasting down a hill.
Put your hand near the exhaust pipe outlet while a helper starts the engine. If the exhaust flow is highly variable in volume (not just simply on-off as it would be for a cylinder misfire), you definitely need to check for exhaust blockage.
Fuel delivery problems (e. g. pressure bleed-down followed by fuel vaporization in the line) can cause hot start problems, but that doesn't account for the odd noise under the vehicle.

Oct 20, 2011 | Cars & Trucks

1 Answer

So i have a cadillac STS when i start it up its like it is accelerating on its own without stepping on the the gas but what i am concern is when i place the car in drive D it knocks really bad a loud sound...


Sounds like a vacuum leak. this will affect the idle causing it to idle high but with no power (at idle) so almost dies at idle in drive, (under resistance) The knocking is likely your exhaust pipe shaking and hitting under car, cos of the engine shake.
Look for a vacuum tube hanging loose from around the intake area. Maybe trim off stretched end and reattach. May be able to hear it with engine running.

Aug 18, 2011 | Cadillac STS Cars & Trucks

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My car has 145000km problem 1: the engine is missing and losing power.


Change your catalytic converter. It is clogged. Do you notice a stange odor when you are traveling? Hear is one way to check to see if it bad. Can you see it if you just look under your car or is it hidden? Locate where they are and at night take it for a little ride just enough to get the engine good and hot. Then stop and look under your car and if you can see your converter glowing a pretty bright orange/red, it would be my guess that it need replaced.

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Is this almost like a metallic buzzing sound?

Find the catalytic converter under the car it should have a shield on it. Use a broomstick with the car running and hold the shield still and have someone give it a little gas. Just move from shield to shield until you find the offending shield.

Don't touch these with your hand as they can get hot fast.

Most parts houses sell a very large hose clamp to go around these shield for about $10, they will know exactly what you are looking for.

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1 Answer

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neither one of these would cause gas to leak. sure it is not coolant ? if you think it is gas it is not safe to drive car as it could catch on fire. possible cause would be a leaking injector.

Jan 27, 2009 | 2005 Chevrolet Impala

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