Question about 1998 Plymouth Neon

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Back firing and spiting and sputtering

I have changed the o2 sensore behind the cat and a new map sensore, new air filter the car has no fuel filter the motor is aduel over head cam. it acts almost like the cat is stoped up but its not getting hot and there is good air flow coming out of the exsust.

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Run vehicle with up stream (front) O2 sensor out if fuel pressure is ok

Posted on Nov 18, 2008

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Why is it stalling?


Mass airflow sensor ? Is the check engine light lit ? What engine - 3.8 or 4.6 ? TPS - throttle postion sensor

Mar 19, 2016 | 2004 Pontiac Bonneville

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My check engine light is on the code catalytic efficiency 420 port 2 how do i find


the cat convertor is contaminated with fuel. If the light will not go off (its always on) you have two choices: 1. install new cat(s) or Run premium fuel until light goes out. However before doing either you must first ensure the car's: air filter is new, the spark plugs are new and you put fuel injector cleaner in every tank of fuel. and you might want to replace the O2 sensor in the exhaust pipe. (fuel injectors foul up and cause spilling of fuel instead of spraying atomized fuel and if the spark plugs are fouled they ill not do complete burn of the fuel and therefore cause fuel to get into the cat converter. The O2 sensor can also cause the computer to adjust the timing to fire the plugs and cause similar issues)

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I have a 98 Chevy blazor 4.3 4x4 it has no power and sputters change fuel filter,mass air sensor,o2 sensor,plugs,wires,cap,rotor,module on desributer check fuel pump psi at 55 to 57 the only code random...


Pull the distributor. Check the gear on the bottom of it. Replace a bunch of them for wear. Causes no power and bad timing. Depending on wear. Replace the gear or the distributor.

Nov 08, 2014 | 1998 Chevrolet Blazer

1 Answer

What is causeing my truck to backfire


Hello,when you changed the cap and rotor did you have them check the timming,the timing chain may have jumped a clog,fuel pump may be getting weak,check you air filter make sure you pull it out in case mice filled up the space undernieth the element,check or change fuel filter,,may be a bad batch of gas may have some water in it,,good luck..

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1 Answer

Replaced fuel pump, fuel filter and sensor, 2002 silverado, truck starts but spits sputters and dies..help


Be sure you are getting good fire to the plugs and if you are take a spray bottle and spray fuel into the tbi and if it runs ok then you have a fuel problem, your pressure regulator in the tbi could be week and not putting enough fuel to the tbi. If not you need to pull the o2 sensor out ahead of the catalytic converter and see if it runs ok if it does then you either have a plugged cat or muffler. To much back pressure on the engine will not allow it to draw fuel into the cylinders and fire the fuel. Hope this helps.

Dec 02, 2012 | 2002 Chevrolet Silverado

1 Answer

My 1993 honda accord sputters when accelerating


If you can't answer when the last time you changed the fuel filter it might not be a bad idea to change it. It could also be a vacuum leak as older cars ran on vacuum controls for emissions and things like that. listen for a possible whistle when accelerating or air being sucked in like a vacuum cleaner. Could also be a bad map sensor, or O2 sensor.

Sep 18, 2012 | 1993 Honda Accord

3 Answers

Car shaking and sputtering. just changed o2 sensor and it did nothing. there is no pick up either


Exhaust couldbe stopped up. remove the O/2 and run it for a minute with the leak and see if the power is back like it used to be. If it is change the stopped up part ( cat converter, Muffler or bent pipe) and drive on. When running with a bad O/2 the convetor can melt and cloggup ( happen all at once)

Jul 19, 2010 | 1999 Chrysler Cirrus

3 Answers

'90 3.1 lumina euro idles ok but tries to stall when accelerated.


If the cat is red then it is probably plugged if the motor can't exhale it wont run at high rpm

Apr 11, 2009 | 1990 Chevrolet Lumina

2 Answers

Determine which O2 sensor to replace.


There are many reasons for a PO171 code, these need to be checked before replacing O2's:

  • Vehicle driven low on fuel or until it ran out of fuel
  • One or more injectors restricted or pressure regulator has failed
  • Fuel delivery system supplying too much or too little fuel during cruise or idle periods (e.g., faulty fuel pump, or dirty fuel filter)
  • Air leaks after the MAF sensor, or air leaks in the PCV system
  • Air leaks at the EGR gasket, or at the EGR valve diaphragm
  • Exhaust leaks before or near where the front HO2S is mounted
  • HO2S is contaminated, deteriorated or it has failed
  • Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
  • Base engine "mechanical" fault affecting one or more cylinders.
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