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98 silverado random misfire

Im getting a random misfire on my 98 chevy truck 5.7 engine p0300 all the time and on my scantool cyl 1 is misfiring really bad so far ive replaced ign system,fuel system,tps,egr,knock sensor,engine,cam and crank sensor,cleaned the mass airflow,o2 sensors,and the problem doesnt go away im thinking i might have gotten a bad injector assy cause its really noisy

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  • Fortyone Keys
    Fortyone Keys Feb 10, 2018

    I had a similar problem. My engine was fifteen years old with 225000 miles on it. Mechanic told me I had a faulty ignitiol coil on number two cylinder. Solved it. Hope this helps. 2002 5.3l vortec

  • roll the ball
    roll the ball Mar 23, 2018

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Run a compression test to check for loose valve seat insert . no 1 cylinder
other wise it is a fuel pressure problem and faulty injector/s

Posted on Sep 26, 2017

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Posted on Mar 23, 2018

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What Causes a P0300 Code?
Low Fuel Pressure
Vacuum Leak
EGR system malfunction
Internal Engine Problems (such as low compression)

Less Common Causes
Faulty Coil
Faulty Spark Plugs and/or Wires
Camshaft or Crankshaft sensors
Ignition module
Computer

Posted on Sep 26, 2017

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Posted on Jan 02, 2017

emissionwiz
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SOURCE: Mass Airflow Sensor 2005 Chevy Malibu. 2.2 ltr.4 cyl.

The MAF is in the flex hose that delivers air to the engine, it has a 5 or 6 wire connector going to it.

Posted on Nov 19, 2008

  • 416 Answers

SOURCE: My 97 Chevy 1500 runs but it will sputter and shut off .

Check the distributor cap/wires/spark plugs. Also might be clogged injectrors (injector cleaner)
Hope that helps
Good Luck

Posted on Mar 18, 2009

  • 22 Answers

SOURCE: mass air flow sensor

the other connector on ur throttle body it the idle air motor. that controls the idle of the car.

Posted on Dec 20, 2009

  • 14585 Answers

SOURCE: 95 5.7 gmc sierra runs bad under load relaced ecm

This engine may just be wore out. Did you check the compression?

Posted on Nov 15, 2010

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SOURCE: 98 Grand Am GT 3.1 engine Very high idle when

MASS AIR FLOW CAN CAUSE PROBLEMS IF ITS DIRTY OR SKEWED .YOUR IDLE AIR INLET PASSAGES OR THROTTLE BORE IS DIRTY OR FULL OF DEPOSITS.BESURE REPLACE EGR VALVE GASKET THE OLD GASKET WILL LEAK.CHECK FOR THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.

Posted on Dec 30, 2010

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2 Answers

Has p0300 code misfire cyl 2 and 3


If it was just cylinder 2 or 3, the code would be 0302 or 0303. Instead, you have random misfires (probably) such that you should be checking things that affect the whole engine. Vacuum leaks, bad plug wires, bad coil(s) or ignition module are most likely, but even clogged exhaust, O2 sensors and bad battery can cause these problems. Yes, a battery can be good enough to start your car but still be bad enough to affect performance. If I had to guess, I would start by testing the ignition module. Most parts stores can test this if you remove it and carry it to them.

May 04, 2015 | 1998 Chevrolet Blazer

1 Answer

What are theses codes for 99 Chevy Prizm 171,300,302,304?


171 Sys lean bank 1 possibly o2 sensor 300, cyl misfire detected random cyl. 302 misfire cyl # 2. 304 cyl misfire cyl #4 with all 3 of these codes it might be time for new spark plugs and wires

Sep 03, 2014 | Cars & Trucks

2 Answers

P0300 Code 99 Chevrolet silverado 1500 5.3L


Random misfire. Computer cannot figure out which cylinder is misfiring or it occurs randomly on all 8 cylinders. A friend of mine found his ABS system was kicking in while driving down the road, feeling like the engine was missing. Computer detected it as a P0300 random misfire. He removed ABS fuse and eliminated the problem.

Mar 01, 2013 | 1999 Chevrolet Silverado 1500

2 Answers

What does code P0300 mean for a 2000 volvo engine


P0300 random misfire P0302 misfire cyl 2 P0304 misfire cyl 4.
Check spark plug and wires and coils

Feb 03, 2013 | 2000 Volvo S40

1 Answer

2002 elantra cyl 2 random misfire


Hi there:A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

For example, a P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2; same condition in P0301 - cyl #1, P0303 - cyl #3 and P0304 - cyl #4.

A code P0300 (or 301, 302, 303 or 304) may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

About your possible solutions, if there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


Hope this helps.

Mar 09, 2012 | Hyundai Motor 2002 Elantra

3 Answers

My 2000 chevy silverado has ap0300 misfire code , how do i fix ti


P0300....Random/Multiple Cylinder Misfire Detected

so its got a misfire and quickest way out here to avoid a expensive garage visit is to change plugs and Ht leads and see what happens ,HT leads is proper english for fire wires by the way ,see iam learning american ---slowly---

Mar 12, 2011 | Chevrolet Chevy Cars & Trucks

1 Answer

Codes: P0304 - Cyl 4 misfire P0170 - fuel trim malf B/1 P0173 - fuel trim malf B/2 P0300 - random - multiple cyl misfire P0105 - manifold absolute pressure/barometric pressure circuit malf P1524 -...


This realy sounds like a fuel problem filter or the pump you are getting to many codes at once and all of these sensor can,t be going bad at the same time Looking at the random misfire and the fuel trim issues map and air charge all at the same time is unlikely The olny other thing you may wan,t to check is the crankshaft pisition sensor but aren,t getting that code so im thinking fuel delevery good luck

Dec 02, 2010 | 2001 Mazda Millenia

1 Answer

99 Silverado code PO 300 what causes it? What parts needed to fix


p0300 is a random misfire. A scanner will need to tell the primary cyls that have problems. A (qualified) repair shop will need to check it. Could be from vac leaks, to fuel pressure, to spark problems????/

Dec 16, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

98 camry engine light on w/misfires & system too lean


take sample of your fuel into clear plastic bottle from fuel line
is there any water present?
this can cause these codes and then not go on storing codes for other bank even though that bank will be missfiring also due to water & P0300 Random/Multiple Cylinder Misfire Detected being logged
check all connections to coils/leads & wiring connectors
due to miss fire codes for cyl 1,3,5 all on the same bank
also look and check for air leaks on that bank (hose knocked off or splithose)inlet manifold gasket,brake booster etc...
3 injectors being blocked slightly on same bank posible!!!
check wires and signal

was it running like this b4 tune up & repairs?
this is what codes are
P0170 Fuel Trim Malfunction (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

the last code is for trans due to misfire/running lean on bank 1 probably a torque problem code
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May 29, 2009 | 1998 Toyota Camry

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