Here's When Ignition Coils SHOULD BE REPLACED!!

Here's Why You NEVER MESS WITH Your Vehicle's Ignition Coils!! Ignition Coil Replacement!! #ignitionCoil #roughIdle #misfire

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Instagram: @ 1roadgarage
Farris' Insta: @ farrispatton

In this video I change my 2005 GMC Envoy (same as TrailBlazer) ignition coils on my 4.2l inline 6 cylinder engine. Unfortunately, this didn't fix my issue so I still have some diagnosing to do.

***This channel is for entertainment purposes only! Do not do what I do. Do not take my advice. I am not a professional. The methods I use may be completely wrong and/or dangerous. Please seek professional help with anything and everything and do your own due diligence (research). Working on cars is extremely dangerous. I am not responsible for any loss of life or limb or property. DO YOUR OWN RESEARCH. THIS CHANNEL IS FOR ENTERTAINMENT PURPOSES ONLY!***

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00:00 Intro
01:07 New Ignition Coils
01:36 Begin Removal Of Old Coils
01:57 My Theory On Replacing Coils
02:45 Continue Removing Old Coils
03:34 Orignial Delphi Ignition Coils
03:51 Checking Spark Plugs
05:44 Old vs. New Ignition Coils
06:25 Installing New Ignition Coils
07:37 My Wife Farris And Her Car
08:22 Starting Envoy After Install
09:06 Is It Fixed?
10:33 Conclusion

[jacobn]

For the future, coils are easy to diagnose. Unplug them one by one. If a coil is bad, you’ll notice when you unplug it the idle doesn’t change at all.

I’d check for vacuum leaks. Start it up and while it’s cold spray some starting fluid or carb cleaner on the vacuum hoses to see if you can find one

[steveb]

As a DIY person (not a real technician) my only suggestion is to invest in a quality scan tool to isolate the problem. Electrical vs. fuel delivery. But after following you for a while I suspect you already knew that.

[mtdoodles]

Check your engine mounts. Common to fail on the Envoy/Tralblazer. They will give you false sense that you have a misfire and it’s the mounts.

Also, check the throttle body, it tends to gunk up. Also the camshaft positioning sensor can make the vehicle vibrate.

[ironclaw]

I have that same engine in my Buick and the ignition coils are one of the few things I've ever had replace. That they were nearly 20 years old and had fired millions of times might have been the real issue. But, even the scan tool they loan you at the parts store was able to point at the correct cylinder for the misfire. Other that that and a water pump it's been quite trouble-free and it runs smooth as silk. When it's idleing at temp, you can't hardly tell it's running because it's so well balanced.

If it's just running rough, I'd suspect a vacuum leak because that will mess with the AFR. If you have a smoke generator it's not hard to see where a leak is. Otherwise I've had luck with spraying brake cleaner around places I suspect a leak and listening for a change in the idle.

One other possible thing to look at that's cheap to do is to get a can of throttle body cleaner and get the extra carbon out of the throttle body. That engine doesn't have an IAC valve, so it does regulate the idle by just slightly keeping the throttle plate open. Just remember not to move the throttle by hand inside the throttle body. Put the key in the ignition, put it in accessory and use the accelerator pedal to open the throttle plate. Then afterward, google the throttle relearn for that car, I can't remember how it went but it's pretty simple.

Though, if you leave the battery disconnected for more than a few minutes, the PCU will basically run a relearn for the entire engine and it will rev itself up and down for a few minutes before calming down. In fact, that may have been what you experienced after replacing your coils because you did have the battery disconnected for an extended time.

[joeteich]

When you pulled the spark plugs out, I think you should remove the plug from the socket and inspect the ceramic for carbon tracking …a black streak running up and down the ceramic portion. Even a small portion would affect it.

[rifleman_brian]

Hi Jimmy of One Road. Love watching your show. In this video (time index 10:57), you mentioned manifold gasket and fuel injectors. I would smoke-test it for vacuum leaks. As with fuel injectors, when is the last time the fuel filter was replaced? Start with something cheap first.

[andyortega]

Jimmy i had an 05 trailblazer had the same issue andndid oretty much all that you have done to it but my problem was throttle body . I cleaned it many times till i decided to change it problem fixed .hope it helps

[gotcheese]

Auto zone loves you guys! Here comes the parts cannon!

[AntonioClaudioMichael]

Looks like the ignition coils are Wet soaking from what looks like a oil leak into the spark plug wells some spark plug wells were brown and wet and some were shiny and dry 4:09 @1Road

[MM_in_Havasu]

Jimmy, thanks for another cool video! Do include your lovely lady Farris in more of your videos, she is a cool person!
Glad to see your Envoy has an inline 6 engine instead of the dreaded 3.6L V6. You need to buy a good quality scanner tool such as an Autel unit, takes the guesswork out.
If this engine is direct injected, it may have a lot of crud on the back side of the intake valves restricting airflow into the engine.

[Dingleberry]

For the cost of those coils, could have bought a GM Tech2 or scanner from Launch.

[williamwhite]

Check the fuel trim. I have a $30 Launch device that reads engine codes and it will also read fuel trim. The Launch professional scanners are not that expensive. For someone like you who has a youtube channel, you should get one.

[wrksnfx]

You could have variable valve timing sensor and the sensor next to it that's bad but if those two sensors were bad your cruise control would only works sporadically and it won't trip the check engine light and those are the sensors in the head right underneath the duct hosing for the intake from the air box.

[battalian]

My 2 cents.. check the Mass Airflow Sensor as it may need replacing. Second to that, the throttle-body may require some cleaning .. lastly.. check if the O2 sensor is after the Catalytic Convertor, as it may be throwing codes to confuse the engine fuel & air mix. Let me know if it helps.
Cheers!

[idletime]

G'evening Jimmy 🤠 . I have a 98' S10 Blazer w/ 315k on it. It has the 4.3 V6 vortech in it. When I bought it it was throwing multiple random cylinder misfire codes, so I changed the oil and the plugs & started running 2 bottles of Berryman B12 chemtool to a full tank to clean the tank, the fuel lines, the pump and the injectors. After 1 full tank it stopped misfiring and runs great. Take my word for it, give Berryman's a try and I bet you'll be glad you did. I hope this helps 🤠 ..

[keithdenner]

You might try cleaning the throttle body. My 2006 had a similar issue and it went away after I cleaned it.

[RoninDosho]

All parts cannons aside, you did what you thought was best. If it's vibrating, it might be your engine mounts.

[themusicman.fromcanada.]

I had an Evoy 2002 300520 km on it changed spar plugs 2 times and never had a problem with the coils did never leek or burn oil best motor i ever had in a car i have been driving cince 1958

[KevinNadeau]

Man, hope you get more miles out of those Delphi coil pack. I’m still running 4 of the 6 original packs on my 04 Envoy with over 335k miles👍

[seansmyers]

Idle air control or clean the mass air flow sensor with some cleaner? Could always get a cheap fuel pressure tester and see if it's reading a couple less than it should be