At least one of my plugs looks like this



Car runs better after replacing, but not perfect. Leads me to think at least one more looks like this. Notice they are "RapidFire" plugs. I'm replacing with CR43TS.

Must take them out first, to see.

What's the best method to get to all of them? (I have flex socket to get around PS for the driver side) ..

Thanks.

 

this is how i do it. Through wheel well, put JUST the spark plug socket on the plug, then with an extension you get just enough in the socket to get a good enough bite to pop it loose. works for me

 

Use NGK or Delco plugs. I have had best luck with them in both of the first gens I have had.
gapped to .60

I was able to get them all from under the hood, but depending on if the motor mounts are sagging or broken the #3 on the drivers side is a pain to get to because of the steering shaft. I have tried the through the wheel well method.
But the best I have found to work was to get the spark plug socket on the plug then attach the wrench.

 

There's two thermal recommendations for the plugs. I've been running with the cooler one for years and all the plugs look rather blackened. Once I changed to the hotter recommended plug they started showing brown. 1994 service manual recommends:

4.3 VIN Z + VIN W = AC Type CR43TSM

For replacements various manufacturers list two different replacements. I go with the hotter but that may also depend on your location. In AZ I might go with the cooler ones.

Always running on low rpm and lack of maintenance makes them look like yours. Should not show signs of liquid black stuff on the tip thou. Would need better pic of the tip and description of the deposit.

 

I honestly suspect everything is all original and from 1994 - with 141,000 miles - on this one. My rusted-out muffler which now has a nice hole on it would seem to verify.

Also, I'm changing the plugs as a result of this:

*more relevant video:

https://www.youtube.com/watch?v=ZMlu5JmKix0

This one has some filler. But after the first couple minutes, begins the diagnosis:

https://www.youtube.com/watch?v=xbh7WLsqerU

The plug you saw had the electrode sucked out. And if it wasn't my only ride to work, it would remain parked. I have another car, waiting on an engine replacement.. not being used right now.

If there is no more embed then please click the link.. and richphotos, I have the ones that say CR43TS on the box, I did not know there were different types heat ranges!

 

Had a full tune-up done today. 6 ACDelco CR43TS plugs, ACDelco spark plug wire set, and I assume ACDelco cap and rotor. It runs MUCH better, just still has some shake, whereas there was no shake before.

What suspects remain? What could that "slight roughness" be?

 

Update.

Watch "Trip home. AFTER TUNE UP. PLUGS WIRES CAP ROTOR ACDELCO" on YouTube

https://youtu.be/xZUR8HV_h9k


http://www.youtube.com/watch?v=xZUR8HV_h9k

 

bump

Here, again, is the EMBEDDED view of how it runs.



Thank you for any help on what to next do, and perhaps how to do it.

 

I think the wires are are on wrong

 

Here we go again with another one of your trucks.

*moves hands like a poker dealer to show I have not stolen any cards*

I am out. Good luck.