Almost two years ago I started noticing a little bit of a hesitation when driving the Suburban around. It was hardly noticeable at first and would come and go. Over the last year the hesitation has got worse and seems to be affected by humidity and moisture. Due to the many things I have had going on, I never really addressed the hesitation issue. In the last couple of months with us getting a ton of rain and the humidity being very high, the hesitation problem seemed to have been amplified. The Suburban would sometime barley be able to get up to highway speeds!
Finally, this past weekend, I set a day aside to work on the Suburban. Both Dad and I figured the problem was electrical since it was affected by moisture. Dad thought that it might be a crack in the distributor cap. The only problem with that theory, is the way the motor in the Suburban is put together, it takes about an hour of removing parts to get to the distributor cap! We figured we would start with some of the basic and check the spark plugs. This was a pretty simple task, but required some creative angles to get to each plug.
After we got all eight of the spark plugs out we noticed a couple issues. One of the plugs (#4 cylinder) was completely carboned over. A couple of the other plugs also had some carbon build up, but not as bad the #4 plug. This spark plug being carboned over would seriously impact the performance of the motor.
We went ahead and replaced all eight spark plugs and I was very happy with the test drive! The hesitation was gone! It was no longer a "task" to drive the Suburban! I wasn't going to be breaking any land-speed records having a 3/4 Ton Suburban with a 454 cubic inch motor and almost 200,000 miles, but I was still happy!
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