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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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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
  • 83810 Answers

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

  • 14036 Answers

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

2 Answers

Random misfire with code PO300 07 Nissan titan. Put new spark plugs in and a fuel pump still hase vary bad miss


P0300 is random misfire code P0301 would be cyl # 1 etc.
With the odb2 scanner at erase codes turn the engine off. With the key in the run position erase the codes. Run the diagnostics again. If you still have P0300 code Check the plug wires. Loss of compression will cause misfire but it would not be random.

Feb 16, 2015 | 2007 Nissan Titan Crew

1 Answer

2000 nissan frontier, started missing engine light came on so we replaced plugs and wires and reset light runs better but still has a little miss... any other suggestions


misfire, has many cause, i have 50 reason list. for get that.
1: bad engine compression, or other major engine issues. mech.
2:bad spark
3: bad fueling. (too much or too little)

it only takes a few tests to find which it is, and in that order.
above assumes, 13.3 to 14.7v at the EFI system at all times running.
and EGR is not leaking.
what does engine light mean.
are you saying the CEL , check (service) engine light glows running? if yes ? why not scan it and report all DTC codes present. P0300 is random misfire. and P0301 is #1 cyl misfire.
as 2 examples.

Oct 08, 2013 | 2001 Nissan Frontier Crew Cab

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

2 Answers

Cylinder 5 and im also getting p0507 idle is higher then expected. ive change plugs wire cap button cam sensor and distributor. but now its throwing the codes p0300 and p0507 it goes from p0300 to p0305...


po 300 is random/ multible cylinder misfire detected po507 idle system rpm high-- go to this site for the po507 meaning--www.obd-codes.com/p507 === please go to this site for the po300 code---- www.obd-codes.com/p0300

Random/Multiple Cylinder Misfire Detected have a good day !!

Feb 15, 2011 | 1997 GMC Sierra

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

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

2 Answers

Random misfire p0300, cylinder 3 and 4 misfire p0303,p0304


change spark plug wires and check corrosion in the distributor coil

Apr 03, 2009 | 2001 Volkswagen Golf

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