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I changed water pump in 03 trailblazer now car is misfiring number 3 really bad is this due to having air in my lines

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  • 40 Answers

No, try swapping the coil pack and see if it changes.

Posted on Jan 04, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 99 buick Lesabre

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.

Posted on Sep 23, 2008

  • 36 Answers

SOURCE: Random Misfire on 2 & 3

I had a problem with a chevy with random misffires on all cylinders. It was the computer. Fords have very few problems with there computers. Does the check engine come on? Maybe have it scanned. 

Posted on Dec 12, 2008

  • 247 Answers

SOURCE: 1996 suburban random misfire or

i would check the fuel pressure first if it is in the good ranges then your pump is good. have you checked your spark plugs and wires? if not i would, if bad replace. otherwise i would have the ignition coils checked to find out if they are working correctly. that is all i can think of. good luck

Posted on Dec 16, 2008

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SOURCE: 1996 chevy blazer heavily misfiring

check to see if the oil cap is on tight,it wont run well if it is off or not tight...if it smells of strong gas fumes then replace the fuel regulator,the catalytic converters could be plugged,let it warm up as much as you can and use an infrared thermometor with the laser light(you can get at Home Depot for about $30.00)and check the temperature of the converters by aiming it at it and the temperature should be no more than 1500 degrees...or pull the distributor cap off and inspect for cracks and corosion..

Posted on May 27, 2009

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SOURCE: How can i tell if my water pump is bad?

most likely the idler pulley
remove the drive belt
there is a pulley just below the alternator that's the idler pulley
you may be able to spin the pulley and hear the noise if not
remove the pulley 13mm or 15mm bolt after u remove spin the pulley on you finger there will be a roughness or a grinding noise
replace the pulley
hope this helps

Posted on Dec 30, 2009

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03 chevy trailblazer, hooked up a code scanner and shows multiple random misfires doesn't give specific cylinder. p0300 code. I changed the spark plugs. no help.

Pull the coil plugs when running. One at a time. If the engine gets worse the coil is good. No difference. Most likely the coil is bad. To check it again, swap it with another. Pull the plug on the suspected bad one. If it gets worse, look to wiring at the one that was no deference. Check for power to the plug.

Dec 23, 2016 | 2003 Chevrolet TrailBlazer

2 Answers

P0303 cylinder 3 misfire

which engine? ; again, and WHAT ENGINE ???????
your fixing and engine and don't know what's there? really?
303 means misfire.
but more accurately it means weak combustion
and can be cause by 3 things. or more.
1: bad spark , be it the plug or wires, or coil
2: low compression, lots of ways. 10 or more, ask.
3: bad air fuel ratio to that cylinder 3, air leaks?

the ECU discovers this with the spark monitor
this monitor (runs all the time) it sees, the crank shaft
not accelerate fast enough, (weak power stroke on #3)
that is all you need to know on P030x codes.

if spark is prefect
and AFR good.
then it must be compression, right?
even water leaks to the combustion chamber can do this.
it is misfiring, that you can bank on.
no engine posted, why do that?

all we know here, is a body. a 05 GC.
5.7L ?????

ill quote the fsm
for you.
i toss coin, lands on 3.7

the FSM listed items for 303, some are IFFY (comments)

  • VISUAL INSPECTION (of spark and injector parts)
  • (F142), (K334) ASD RELAY OUPUT CIRCUIT (i disagree)
  • CHECKING FUEL PRESSURE (why only 1 cylinder?)
  • FUEL PUMP MODULE (ditto)
  • CHECKING FUEL LEAK DOWN (injectors leaks)
  • FUEL INJECTOR (injectors sticks)
  • INJECTOR CONTROL CIRCUIT (shorts or opens in the line)
  • PCM (last , if ever. i bet not it)

Basics is better.
3: BAD COMPRESSION, or even water leaks or cam lobe damage
or valves in head bad. ,

does your engine use COPS? coil over plugs????
why not say what engine.

did you replace the spark plugs and use the correct type
and gap them per the hood EPA sticker (look up)
and if it has COPS, did you at lease make sure the COP boot
on #3 is brand new? if not why not?
using the old boots on #3 is wrong, idea. they all fail. soon.
the 3.7 has COPS
put new boot on it. (buy them, if possible. (i carry spares at all times)
then look in the wells. are the wells full of oil or water. BINGO.
did you even look there?

the one hard part of misfire is , is the AFR, air fuel mix ok on #3
and compression, W.O.T. the tool is like $20 and 15min work.

Sep 04, 2014 | 2005 Jeep Grand Cherokee

1 Answer

03 trailblazer check engine, battery, security, and air bag light on, also guages go up and down

Try changing the ignition switch first, a bad ignition switch can cause any number of strange electrical problems.

Jan 18, 2014 | 2003 Chevrolet TrailBlazer

1 Answer

Car started knocking really bad got a cylinder 2 misfire code after opening coolant bleed valve with enging hot

Okay, it may be due to overheating, that may be the noise you heard, lets hope. first allow engine to cool, open radiator cap or the resivoir cap, which ever is the fill, remove the bleeder at top hose and fill radiator slowly until coolant comes out bleeder.

note if water pump was replaced due to leaking and engine was overheated at that time then it may be a good idea to replace the thermostat .
after filling is done start engine and allow it to run. watch temperature if temp start to climb past half way shut engine down and let sit for 5min. then restart and check level, in res do not open cap . feel air from fan and see if it is getting hot, this may take up to a half hour but do not drive,

A few questions, does this jeep have an electric fan?
when you heard the knocking was engine temp hot?
If you start jeep cold does engine knock?
Did this jeep get a new thermostat with waterpump job?
did it overheat when pump went bad and why did water pump get replaced?

sorry for all the questions ,just trying to get all the info to help you .

Dec 25, 2012 | 2004 Jeep Grand Cherokee

1 Answer

My Trailblazer started idling and running rough intermittently. We thought bad gas. We were on a trip and used a gas teatment to get rid of water. Did not help. Delaer thought the same but now says...

I'm guessing you have the 6 cylinder engine and not the 8? I don't buy what the dealer told you. If you're really worried about a little water in the fuel system, run a bottle of Seafoam through the brake booster/ gas tank, that will solve any water in the system. Change your fuel filter after you do this, it will be dirty now, due to the Seafoam cleaning your gas tank. Wondering what would need to be "sealed" if there were a little water in a cylinder due to bad gas??? There are 6 coils on this engine, one per cylinder. If the coil goes bad, you would get a check engine light for a cylinder misfire and it would be consistantly running rough. Since it your problem happens intermittently, I'd check the wires going to the coil for any faults. I'd also check for a possible 02 sensor starting to go bad.

1 thought, does this only happen when ever you happen to have the defroster on, or the A/C? If so, I can help you solve your problem easily.

Dec 19, 2010 | 2008 Chevrolet Trailblazer

1 Answer

I over heated my 03 4.6L discovery now water is coming out of of the engine mechanic said that the block is crack and tha #7 cilinder is misfiering cuz cilinder wall crack

How long did you drive after it overheated? Water Pump maybe bad and leaking from weep hole, misfire may be due to heat damage, wires etc, but I would get a second opinion before saying the cylinder wall is cracked. Unless you really overheated and drove for a while, you should not have done that much damage.

Jan 04, 2010 | 2003 Land Rover Discovery

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

May 29, 2009 | 1998 Toyota Camry

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