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Runs smooth then runs rough & rough back to smooth running.


If your check engine light comes on get it checked. To me it sounds like an engine misfire probably cause by a coil pack or spark plug wire going bad. The misfire should cause the check engine light to come on maybe even flash if the misfire is bad enough

Aug 19, 2015 | 1996 Chevrolet Cavalier

2 Answers

Engine will bog down and only go so fast


Bad O2 sensor, leaking injector, blocked air filter, and other possible causes. A restricted exhaust would also cause loss of power but not make the engine run rich.

Jan 20, 2014 | 1991 Isuzu Pickup

3 Answers

Code p731 p732 p172


code p0731 p0732 are internal gear ratio trans. codes and p0172 vehicle running rich can also be caused if vehicle trans. is slipping

Aug 28, 2012 | 2000 Nissan Maxima

1 Answer

After the engine start running for sometime it starts shaking.


hi this could be a few things, i would check your idle as a very low idle will cause engine shaking when the engine is near stalling, idle should be around 700rpm approx when warm. If that checks out all good check the leads and that one is not getting worn and causing a misfire or a vaccum hose is not off, both will cause similar problem. The last thing i can think of is a broken engine mount causing problem as when motor idles or runs at a certain rpm it will shake harder and may be the cause aswell

Jun 08, 2011 | 2001 Subaru Legacy

2 Answers

The car is running hot..we went to change the thermostat, but discovered it didn't have one in the line. What could be causing it to run hot??


check electric fans to see if they are coming on. and also make sure there is enough anti freeze in system. if fans do not work proper, check the fan relay if relay is ok. then the problem is either a bad wire or the fans itself are bad. to check fans-- take wire connector off of fans, then run a wire from positive on battery to positive on fan, ground other wire if need be. if fans do not run then thats your problem.

Aug 20, 2010 | 1996 Nissan Sentra

1 Answer

Service engine light/ reduced engine speed with new gas cap. auto runs smoother without it. can the gas cap cause problems?


Yes, there is an o-ring in the gas cap for your vehicle. If it is deteriorated it can make the car run poorly and cause an engine light to come on.

However, it would not cause a venting problem that would "reduce" engine speed. That is more likely caused by problems listed below.

The gas cap you use should fit the car snugly when you turn it. There should be a little resistance there as the rubber o-ring grabs against the metal.

Lack of power and a vehicle running rough can be caused by one of two very common problems. One is a leak in the air duct between the air filter and the throttle body. The other is a leak from rubber hoses connecting the intake to the PCV valve at the crankcase causing a vacuum leak. More serious problems such as a misfire from a bad coil pack or a blown head gasket can also cause the vehicle to lose power and run poorly but these are not as common.

Jul 25, 2010 | 2004 Oldsmobile Bravada

1 Answer

98 gm blazer has black soot from muffler giving code insufficiant switching o2 sensor bank 1 and 2 any ideas ?


Your Jimmy is running rich, air fuel ratio is not correct. Start with cleaning your MAF sensor, a dirty MAF sensor will cause your engine to run rich or lean, other causes would be a faulty fuel pressure regulator. Start with the simple and to common and try cleaning your MAF sensor, you can pick up a can of MAF sensor cleaner at most auto parts store like Auto Zone or Part Source.
Also make sure your engine is running at the proper operation temperature 190", cold running engine will cause the ECM to run your engine rich. Causing the back soot and fouling up your spark plugs and intake ports with carbon.
The ECM was programed to recognize the 4.3 vortec to run at 190" and anything cooler will cause it to run rich and poor on economy.
Thank you for using fixya and good luck.

Apr 27, 2010 | 1998 GMC Jimmy

2 Answers

Does thermostat cause service engine lite to come on? is it necesssary to change it?


yes it can,you sould change it, the computer sees its running cool and it make the fuel mixture more rich, this could cause converter damage, also make sparkplugs burnout faster,it make you burn more gas. good luck,hope this helps.

Oct 22, 2009 | 2005 Chrysler 300

1 Answer

Random multiple misfirings


Here is a list of possible causes. You should not drive the vehicle if the check engine light is flashing all the time, you can cause even more damage. It could pay to have a professional find the real cause.

Spark plugs that are incorrect for the application, cracked, improperly gaped or worn can cause the engine to misfire or run rough at all times.
An IC module that failed to correctly control the ignition coil(s) will cause the engine to misfire or run rough at all times.
Poor connections, broken wiring or wiring that has shorts to ground can cause the engine to misfire or run rough at all times. NOTE: Check connectors that might be pulled apart as the engine flexes or wires that short to ground as they pass near brackets or shorts to ground on the exhaust manifold.
Fuel injector(s) that are shorted, plugged or partially restricted can cause the engine to misfire or run rough at all times.
An ignition coil(s) that has low output, corrosion on the coil tower(s), is carbon tracked or arcs to ground will cause the engine to misfire or run rough at all times.
A PCM that failed to properly control the injector or ignition timing will cause the engine to misfire or run rough at all times.

Feb 02, 2009 | Saturn SL1 Cars & Trucks

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