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I have a 1998 suburban fires up and ideas ok but when put in gear it starts missing replaced spark plugs and wires also replaced cap and rotor . Has a po300 code . Does anybody have any suggestions what else it could be

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  • Cars & Trucks Master
  • 5,309 Answers

Random misfire code usually means some ignition part is bad and most common is ignition module, second is coil.

Posted on Mar 27, 2015

  • Kenneth sperry Mar 27, 2015

    Is there a way to test module and coil

  • David Harrelson
    David Harrelson Mar 27, 2015

    Parts store can test module, but even if it passes may still be bad. If it shows bad definitly replace it. Coil can be tested with meter, but again not 100% accurate, because as these parts heat up they can fail while still testing good cold. If possible, use a know good part from another car for testing.

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Posted on Jan 02, 2017

3dmaster
  • 183 Answers

SOURCE: 1996 Chev. 1500 pickup truck, 305 C.I. PO300 code

Than you problem solved by yourself already,

Dear you had done good job for your dream,

just some modification nedds like,

CHECK YOU ENGINE MOUNTINGS,OR THIGHTEN IT,
YOU HAVE TO ALSO CHECK YOUR PLACEMENTS ORDERS OF YOUR ENGINE THAT NOT TO BE CHENGED AFTER YOUT TRY.

THNX

Posted on May 20, 2008

  • 33 Answers

SOURCE: 1998 nissan sentra wont start

have you checked the timing belt?

Posted on Feb 17, 2009

  • 2841 Answers

SOURCE: proper connecting of spark plug wires to distributor cap

Click this link: http://autorepair.about.com/library/firing_orders/bl-saab-firing-97.htm Choose the correct engine and you will see a diagram of spark plug wiring.

Posted on Aug 10, 2009

  • 29 Answers

SOURCE: 2001 silverado 4.3-v6 miss fire

check the coil pack

Posted on Oct 02, 2009

samtoler
  • 666 Answers

SOURCE: 1991 Chevy Caprice, V8 5.0L, throttle body

tune up is likely what you need from description

Posted on Jun 15, 2010

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3 Answers

Ignition mystery! 1994 GMC Suburban 2500 5.7 mtr. No spark to spark plugs. Have spark from coil to distributor. Have changed coil wire, cap, rotor, ignition module, and coil. have 12.5 volts going to...


I guess you could have the ignition analyzed on an oscilloscope. Maybe a tech could see something then.
I always heard the only gap was the spark plug gap-the rotor has no gap-are you sure you got the correct rotor? And does it touch the top distributor cap coil wire tower?

Let us know. It is a mystery worthy of a solution.

Sep 21, 2013 | Chevrolet Suburban 2500 Cars & Trucks

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Hello...I have a '95 GMC K2500 Suburban with a 5.7L that failed a recent emissions test. I replaced the spark plugs, removed and cleaned the EGR...cap, rotor wires look OK...truck re-tested worst


Retarding the timing will cool the combustion which will lower the Hydrocarbon number,it will run bad but after a passed e test put the timing back to an advanced state which may help with the stumble.

Jul 22, 2017 | 1995 GMC Suburban

1 Answer

Spark plugs and wires


It sounds like the spark plug wires are not plugged into the correct place on the distrubutor. take the distributor cap off and crank the engine over. Make a note of which direction the rotor spins. (Clockwise, or Counterclockwise) then find the firing order for that engine. Sometimes the firing order is on the intake manifold. (if you tell me which engine it has, the 4 cylinder 2.0, or the 6 cylinder 2.5; I could post you the firing order). Now on the distributor cap there is one wire post that has the #1 on it, that would be where you put the spark plug wire from cylinder 1. Following the rotation of the distributor rotor, you would put the spark plug wire for the next cylinder in the firing order after the #1 wire, and so on.

Dec 11, 2011 | 1998 Ford Contour

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When i stopped the 1997 suburban 1500 it was running fine. i tried to start it 2 days later and it wont start. it sounds like the engine is fighting itself. it cranks then stops then cranke a little but...


check the timing and compression as this is a typical chevy senario, runs good it seems and shut off and now fights and locks up. Pull #1 plug, put into wire again and rest on exhaust manifold so electrode is very near metal, this will cause a spark. now put finger in the plug hole and crank motor, does the plug spark at the same time finger gets pushed off plug hole (compression) ? Also you can bring #1 cylinder to top ,(compression ) and remove dist cap, where the tab on rotor aims is it aiming to the plug wire in the cap that goes to the #1 spark plug. If any of this is not in line then the timing is off and you have to check. 1) timing chain and gear, 2) distributer gear on the bottom of dist which messhes with cam gear, (you can check this with cap off and try to spin or turn by hand.) And the most severe case is the cam broke, after all other checks you can pull off a valve cover and turn motor over and check all lifters for open close movement. I hope i didn't scare you . AND i also wish the easiest fix for you as well.

Jan 17, 2011 | 1997 Chevrolet Suburban

2 Answers

What do these trouble codes mean po306 cyclinder misfire detected .how do i fix the problem?


it means you have a misfire on the number 6 cylinder

this could be caused by a whole lot of reasons.

start by inspecting for a bad plug wire if it has them

check for fire on the cylinder with a spark test tool from local part store

if it is a coil-on-plug set-up, check the coil for fire

replace coil/plug wire as needed, replace boot on coil if coil needed, replace spark plugs

Oct 11, 2009 | 1998 Chevrolet Blazer

1 Answer

I replace intake gasket on my 95 suburban and now is out time.


make sure your timing tab is also at 0* degrees and when u put the cap on make sure it lines up with the rotor at #1 spark plug wire if it doesnt line up very easyly pull up dist and u can see it rotate counterclock wise now either turn rotor clockwise or counter 1 gear tooth to get it exact so when it sits flush on the block the cap #1 wire lines up with rotor

Aug 16, 2009 | 1995 Chevrolet Suburban

2 Answers

Engine cough


Go to Auto Zone and have the Suburban scanned for DTC codes, Auto Zone scan for free and most Auto shop will do it for $10.00 to $20.00 since they want your business cause they know most large Auto Parts store scan for free.
It sounds like you have a miss fire which can be caused by and O2 sensor or dirty MAF sensor which can be cleaned or time to replace the rotor and cap, plug wire and spark plugs.
Note that the distributor cap and rotor is made of plastic and is know to crack do to time and heat. There is also a rubber valve or screen at the bottom of the distributor that get's dirty and the inside of the distributor collects with condesation and corrode the rotor and caps too.
Good luck and hope this helps, Get it scanned and see if it's a sensor that is causing the miss fire on the hightway. If not then replace the cap and rotor and clean out the distributor if needed. Inspect the plug wire and replace if needed and change the plugs.

Keep me posted. be glad to help you out.

May 28, 2009 | 1996 Chevrolet Suburban

2 Answers

'83 Monte Carlo - Miss fire at idle/accel./driving


You can have car put on scope and it wll show any irregularities in the ignition system. It can also be dowithout any equipment. First, loosing ALL 8 spark plug wires, Now place the spark plug wires loosly back on, just secure enough to secure. You might need 2 people. Being the miss is more consistant in gear, APPLY THE EMERGENCY BRAKE , put trans into drive and raise rpm's till miss is obvious. Remove ONE plug wire at a time, TILL THERE IS NO DIFFERENCE IN MISS. Thats the cylinder missing. Start with the spark plug, inspect, work back to wires and cap. An EXTREME result will be NO COMPRESSION.

Apr 02, 2009 | 1983 Chevrolet Monte Carlo

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