Question about 1997 Isuzu Trooper

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97 trooper. Is the tube off the ignition coil also called the spark plug boot? There is a small crack on the bottom, would that cause a misfire?

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  • thornberg Jun 25, 2009

    Thanks man. Is it possible to replace just the boot?

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Yes and Yes, it would cause a misfire, I would replace all of them

Posted on Jun 25, 2009

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2 Answers

'97 Max. I changed the plugs, boots, f/filter and pcv and still have a rough idle I get codes 1320,0300,and 0325. And I am stumped....can't figure it out I did notice 1 plug was kinda wet


CHECK YOUR MAS AIR FLO SENSOR AND THE TUBE CONNECTING THE AIRCLEANER TO THE MOTOR THERE MIGHT BE A LEAK IN THE TUBE CAUSING THIS CONDITION

Jun 25, 2015 | Cars & Trucks

1 Answer

Misfiring on cylinder #3


Misfiring can be cause by ignition coil,spark plugs,wires,engine valve,cylinder compression,
if it's a quad four then crack around the ignition coil. there is 2 coils like 1-4 coil and 2-3 coil
first check spark plug color or foul of gaz
hope it help

Oct 18, 2014 | 2002 Pontiac Grand Am SE

1 Answer

Engine Code 301


Code # 301??? That is NOT a valid Diagnostic Test Code (DTC) for the engine control system on a 2000 Mercury Sable.

Assuming that you mean P0301, that is a cylinder misfire code that is identifying number 3 cylinder as the cylinder with the misfire problem. MANY things can cause a cylinder to misfire including spark plugs, spark plug wires or boots, burnt valves, broken valve springs, blow head gaskets, cracked cylinder heads, bad or dirty injectors, faulty injector control circuits, Failed ignition coils...the list goes on....proper diagnosis required.

May 30, 2012 | 2000 Mercury Sable

1 Answer

The porcelain spark plugs keep on cracking when the car is being used


Is the porcelain "cracking" or are they getting "carbon-tracked"? (see example photo of carbon-tracked plug below).
It is common for carbon-tracking to occur if your original plugs were carbon-tracked and you replace the plugs without replacing the wires. If the plug is carbon-tracked, the boots on the wires or the coil boots (coil-on-plug ignition) are also carbon-tracked. If you do not replace the wires or the coil boots, the ignition will still misfire by following the carbon-track on the inside of the boot. This will cause your new plugs to also be carbon-tracked within a short period of time (days or weeks).

There is no reason I can think of for the porcelain itself to actually crack other than faulty installation techniques or possibly, cold liquids getting poured on extremely hot plugs.


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May 11, 2012 | Buick LeSabre Cars & Trucks

1 Answer

My 2000 Ford Expedition 4.6l had a manifold seal blown and was leaking fluid in the sparkplug sockets. Seal replaced and spark plugs changed, now I am having to change coil packs because Im getting...


Faulty EGR valves do not cause "false" misfire codes. An EGR valve that is not closing properly can cause misfires (and misfire codes) but they are REAL misfires when this happens.

To understand this, you need to understand what a misfire is and what kinds of things can cause them. It is a very LONG list and I do not have the time or space to get into all that here.

You will also need to understand this if you are going to properly diagnose your misfire codes without wasting a whole bunch of money on parts that you do not need. MANY things can cause misfires other than spark plugs and ignition coils.

I do not know what EGR code you are getting, but I will tell you that in the 37 years that I have been diagnosing and repairing cars, there has only been once that I can remember that I have ever replaced an EGR valve on a Ford engine because the valve itself was faulty. Most EGR codes on Fords are caused by either clogged-up EGR ports or a bad DPFE sensor. Every so often you will find a bad EGR control solenoid or a broken vacuum line, but it is extremely rare that the EGR valve itself the cause. With the exception of leaking vacuum lines and on certain engines, clogged EGR ports (Like the 6 individual EGR ports in the 4.2L engine), none of these causes for EGR codes will cause any misfires.

Also, most of the time when people pull the trigger on the ignition coils on the 5.4L and 4.6L engines, all the thing really needs is new spark plug boots. They get contaminated with oil and water and can cause carbon-tracking on the spark plugs and/or arcing into the spark plug wells instead of sending the spark through the spark plug. It is pretty much the same thing as having bad spark plug wires on a conventional ignition system. You don't throw the coil and distributor away on a conventional system because it needs new wires. Neither should you replace a coil on a COP ignition system that just needs a boot. Some auto makers do not make the boots available seperate from the coil. Ford at least had the insight to understand that people cannot afford the cost of replacing all of their coils just because the boots are defective.

Mar 24, 2012 | 2000 Ford Expedition

2 Answers

I have a 2000 lincoln Navigator that bucks under light load in overdrive. The problem is not the transmission and no codes are present. could this be an ignition coil, and if so, which one?


Hello Mr best wrench.

Certainly could be an ignition coil as it is a common issue.
A small misfire doesn't easily set a code and often a technician will need a scan tool capable of reading the vehicle computer in what Ford calls "mode 6".
This gives live data of each cylinder on a road test.
If it has been a while since the spark plugs were replaced it may be a good place to begin.
Keep in mind that these plugs are difficult to access and proper torquing is essential.
Improper installation can lead to stripped threads very easily on this engine.
Inspecting the boots at the coil for carbon tracks on the inside of the boot often are a clue to misfire.
Also have seen where water intrusion down past the boot and into the spark plug tube causing rust creating misfire as well.
Inspect the tops of the coils for cracks or signs of burn through.
I'd advise also to use Ford original coils as I have had issues with aftermarket suppliers.

There are a few tips for you, I hope it helps.
Thank you for using FixYa.
KL

Mar 24, 2011 | Lincoln Navigator Cars & Trucks

1 Answer

My 98 exployer is misfiring on all 6 cycdeers but runs fine after warmed up


Misfires across all 6 cylinders could indicate the following:

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Priority Action Part Type Cause 1 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s). 2 Inspect Distributor Cap Loose, Burned or Cracked Distributor Cap. 3 Inspect Distributor Cap and Rotor Kit Loose, Burned or Cracked Distributor Cap and Rotor. 6 Inspect Spark Plug Fouled, Damaged, Broken, or Incorrectly Gapped Spark Plug(s). 7 Inspect Coil - Ignition Faulty Ignition Coil. 8 Inspect Condenser-Ignition Faulty Condenser-Ignition. 9 Inspect Point Set Burned, Worn or Incorrectly Set Ignition Points. 15 Inspect Timing Specification Incorrect Ignition Timing. 19 Inspect Fuel Injector Dirty or Worn Fuel Injectors. 21 Inspect Intake Manifold Gasket Leaking, Worn, or Damaged Intake Manifold Gasket. 22 Inspect Distributor Worn, Damaged or Faulty Distributor. 24 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.

Nov 03, 2010 | 1998 Ford Explorer

1 Answer

Check engine light on. 4 cylinder. Light flashes on acceleration. Sometimes idles rough. Computer scan reads random misfire and #2 & #3 misfiring. Added fuel injector cleaner but no help yet. Cleared...


There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

Dec 07, 2008 | 1999 Toyota Camry

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