Question about 1998 GMC Jimmy

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Have a 1998 4.3 v6 vortec, code is po300, i have repleced plug ,wires, cap button, and number 1 injector is new. i checked to see if num1 is getting fire to injector, it is. my snap on is still showing a missfire on num1 what shoul i check. this is the only code shown

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Hi! This can be a PCM (powertrain control module) failure. The PCM has connectivity on all electrical current that runs inside the car which includes the engine and transmission. If the PCM is faulty something else fails. I strongly suggest that you have your PCM resetted to resolve the problem. Hope this helps and thank you for using FixYa!

Posted on Sep 05, 2010

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Posted on Jan 02, 2017

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2000 chevy astro van 4.3 v6/I changed dist.cap 4 times in 1 year rotor too/runs rough,hesitation,bad ildeing,could it be dist.gear /shaft are worn/got code po300


code p 0300 is random/ multiple misfires
each p 0300 code ( 0301,2,3,4 etc) indicates the piston at fault
this code can be from electrical , ( cap plugs wires etc ) but is mostly attributed to problem injectors and ecm injector controls --wiring and connections
check the other areas for the fault as you may be concentration on the wrong area

Oct 24, 2016 | 2000 Chevrolet Astro

1 Answer

Hey I'm mike. Here want going on my s10 blazer


to start with the in front of the cat is different to the one after the cat and will produce different signals for the ecm and that will throw up fault codes

Code p0154 refers to heated oxygen sensor(HO2S) 1 bank 2--no activity detected--===causes --Wiring--HO2S-- ECM

replace with correct sensor (heated sensor )

code p0300 refers to random/ multiple misfires detected---===causes---spark plugs--HT leads --injectors---ignition coil/s---low compression---wiring

The HT lead should be replaced as by pulling it off the plug the internal resistance has been damaged. Check the injectors are firing correctly as my guess is that the injector is faulty and that is what set you to change the HO2S sensor

Aug 31, 2014 | Cars & Trucks

1 Answer

Ford laser 99 no power


Hi there.
well when you throttle up to about 2000rpm do you get blue smoke coming out the exhaust.When driving on flat road will it power up as normal with out missing or getting hot.
what colour was the old spark plugs were they black or light brown.
When you start engine and run for 3 minutes then let it idle and remove oil filler cap do you get smoke coming out.
Number 1 if yes then engine is lacking power due to piston rings worn answer rebuild engine.
Number2 spark plugs brown [good] if black soot as num1.
Number 3 if you get black smoke or blue ,then the engine is lacking compression could be your problem as num1
OTHER WISE GET YOUR TIMING CHECKED AND SET TO BOOK.

May 23, 2014 | 1998 Ford Laser

1 Answer

95 chevy s10 with a vortec v6. has a mis


The Vortec 4.3 liter V6 is notorious for problems with the fuel injector.One injector solenoid feeds all 6 injector nozzles,and sometimes one whole side of the engine will not get any fuel.See if you can smooth out the engine by spraying some starting fluid into the throttle body(remove the rubber hose from the throttle body).If this doesn't seem to make a difference,you may just be dealing with an ignition problem(cap/rotor/wires/carbon tracks on the spark plug insulators).

Mar 24, 2013 | Cars & Trucks

1 Answer

Need spark plug wiring 1998 chevy V6 truck


the cap should be marked on a vortec 4.3 liter. the left side of engine is from front #1 #3 and #5 cylinders. the right side from front is #2 #4 and #6.

Jun 13, 2012 | Chevrolet 1500 Cars & Trucks

1 Answer

4.3 vortec code po300


code p 0300 is random misfires and it is mainly from low fuel pressure
regardless of the make of car the pressure has to be no less than 45 -65psi
check the fuel pressure regulator
the next thing could be a problem ECM unit so substitute it with a known good one and see what happens

Mar 29, 2017 | GMC Jimmy Cars & Trucks

2 Answers

OBD system diagnostic trouble codes? what do they mean? P0123 P0138 P0205 P0305 P0300


po123-tps curcuit high---po138-02 sensor high volts bank 1 sensor 2,--po205--injector curcuit open cylinder 5,---po305-- misfire cylinder 5,--po300 random/multible mis fire,

Jun 02, 2010 | 1998 Dodge Caravan

1 Answer

I have a 02 GMC with a 4.3 liter vortec v6 and its running very ruff. The plug in the #2cyl is black and smells like gas. I replaced it with a new one, cap and roter look fine, did a compresion test and it...


mabee a bad plug wire but if its a dry looking soot black then a leaking fuel injector or the control wire to that injector is shorting to ground.

Mar 22, 2010 | 2002 GMC Sierra C/K1500

1 Answer

CODES NUMBER 1 INJECTOR CIRCUIT OPEN.1998 DODGE INTREPID 2.7


The ground wire from the injector to the pcm is open. The injectors share the same power wire but the pcm grounds each one individually to fire.

Apr 17, 2009 | 1998 Dodge Intrepid

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