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Would a gas cap not seated properly cause a misfire code

My misfire code is po300 if my gas cap was not seated properally would it show a code all the time

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What do dtc's po172,po300,po455 mean together


code p 0172 refers to system too rich bank 1=== causes --intake blocked --EVAP canister purge valve ---fuel pressure --EGR system---injector/s---HO2S ( heated oxygen sensor )
code p 0300 refers to ransom/ multiple cylinder/s ---misfires detected===causes --spark plug/s---HT lead/s---injector/s---coil/s - low compression
code p 0455 refers to evaporative (EVAP) emission system--large leak detected ===causes ---hose connections --intake leak--- EVAP canister---EVAP canister purge valve
AS a side idea , check that the fuel cap is properly installed first as it may not be properly tightened or fitted

Feb 24, 2016 | Cars & Trucks

1 Answer

PO440


http://www.obd-codes.com/p0442
P0440 indicates the failure of the EVAP system to develop proper vacuum. If you got
and replaced a proper good quality gas cap, you have corrected the most common cause.
However, in fully searching the causes of this code (http://engine-codes.com/p0440_chevrolet.html ) (pardon the generic GM info, but will apply for you)-----you will find there are 5 other causes of the vacuum failure, which are independent of the gas cap. Your good local mechanic can sort those out; I would save your gas cap
receipt if you were advised to buy one not needed. As you probably know, your
State emission test facility checks your gas cap----so that is another way to find that specific portion of this answer,
(for their fee).
P0300 is a generic misfire code. For this, a specific Cadillac forum may be most
helpful = 2001 Deville intermittent service engine soon light code P0300
co-logo-100x100.png 2001 Deville intermittent service engine soon light code... I recently bought this car from an owner who took decent care of it but a week after i bought it, the service engine light appeared. After a few View on www.cadillacforums... Preview by Yahoo You will see that this generic code is perhaps more serious, costly, and harder
to track down than the P0440. You will also discover that P0301 is cylinder 1 misfire, P0302 is cylinder 2, and etc, etc. If you get a good diagnostic, they will generally
be able to localize the problem fairly specifically---and get a more specific fix. The person who reported this code was unhappy because he was given several ($$) fixes,
before he got one that erased the code, and was a solution. (Be forewarned ----A generic misfire can have umpteen issues--or one! !; use your own local preferred method for solving this with a mechanic who gives you good service, and stands behind what they do.)
2001 Deville intermittent service engine soon light code P0300

Jun 04, 2014 | 2001 Cadillac DeVille

1 Answer

Error code P0300


code po300 refers to random/multiple cylinder/s--misfire/s detected.===causes-- spark plug/s--HT leads /s--injector /s--ignition coil/s--low compression ---wiring
Check that the HT leads are not touching each other causing spark cross over . Ensure that the coil wires are properly connected . From what you have done, I would revisit everything ( all connections ) to ensure that everything is in order including firing order of the leads

Apr 20, 2014 | 1999 Mitsubishi Galant

1 Answer

My 99 grand prix bucks and jumps in reverse and when idling in drive or park


The codes pretty much explain the bucking and jumping. The engine is obviously misfiring on several cylinders.

With the P0171 code, the lean condition (and therefore, the misfiring) could very possibly be caused by a bad Mass Airflow (MAF) sensor, a faulty fuel pump, a clogged fuel filter, or a HUGE vacuum leak.

However, the P0171 code can also be caused by excess unburned air/fuel mixture going down the exhaust due to cylinders misfiring for other reasons like a faulty ignition coil, ignition module or bad spark plugs (as well as other possibilities).

So, now you are faced with trying to determine if the lean condition is caused by the misfires or if the misfires are being caused by a lean condition. (PROPER DIAGNOSIS REQUIRED)

Mar 24, 2012 | Cars & Trucks

2 Answers

Trouble codes for saturn ls2 car is showing the following trouble codes. po300, po306, po451 p2bo3 and c112b


P0300 Multiple Cylinder Misfire Detected

P0306 Cylinder 6 Misfire Detected

P0451 EVAP Pressure Sensor Range/Performance

I have no idea what those last two are. Typo, maybe?

Your first two codes could be caused by old spark plugs and/or leaking plug wires.

Your EVAP code could be a bad fuel tank pressure sensor or a malfunctioning EVAP system. With that code, if you remove your fuel cap and get a whoosing sound, then it is an issue with your EVAP system not properly venting the tank. If you don't get that sound, then the tank pressure sensor is bad.

Mar 05, 2010 | 2000 Saturn Ls 4dr Sedan

2 Answers

P0300 code on a engine its says random multiple cylinder misfire ???? changed the plugs and plug wires


recheck the plugs and wires check for proper gap on plugs also check that wires not crossed and that wires are properly seated on cap and plug

Nov 12, 2009 | 1998 Chevrolet Camaro

1 Answer

02 4Runner 3.0 showing service code 300. Replaced


Replace all your plugs, po300 code is random misfire which could absolutely be caused by bad gas causing detonation. Try an octane booster and gas stabilizer when parked for long periods.

Sep 12, 2009 | 2002 Toyota 4Runner

1 Answer

1997 E-420


Hello, Check/replace distributor caps and rotors. They will cause this problem.
If you find this information to be correct would you please enter a "fixya" rating.
Thanks, Gator241

Jan 24, 2009 | 1997 Mercedes-Benz E-Class

2 Answers

2000 bonneville


P0300 is a random misfire code, if you are not mechanically inclined the first thing i would do if you havent done so in the past year or more, is change the plugs and wires, a random misfire code can be caused by worn plugs and/or wires not firing properly. let me know if that fixes it.

Jul 03, 2008 | 2000 Pontiac Bonneville

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