98 V70 NA 155000 Miles = misfiring?

[E Showell]

Watch that cylinder with the white powder in particular. If you develop a misfire in that cylinder, time for a new set of plug wires.

[98v70dad]

Watch that cylinder with the white powder in particular. If you develop a misfire in that cylinder, time for a new set of plug wires.

Well, that is what I was thinking, but my wires are high quality (bougicord) and they only have 35K on them. I've never had even a cheap set of wires on other cars fail that soon. At stop lights sometimes my car feels like one of the cylinders isn't firing completely. Hard to tell though. It was exceptionally smooth first thing after the plug change. Now its back to being a little rumbly at lights. The dist cap and rotor (both bosch) are also 35 K of service. I didn't really want to replace the wires on a hunch. I drive 100 miles per day at either 0 or 70 mph so if that cylinder is quite working properly the new wires would pay for themselves pretty quickly.

[BEJinFbk]

What happens if you run it up to about 80, throw it into neutral
and let it roll through your vibration speed with the engine
disconnected from the drivetrain? Just a thought.

[E Showell]

Here's the deal. It is possible that the plug wire on that cylinder was not fully seated on the plug tip and that there was some little bit of arcing between the connector and wire. Use a spray contact cleaner on that wire and always use dielectric grease on the plug tip where it inserts into the plug wire when changing plugs and you should avoid this potential problem. Sorry, but high quality wires will arc just as much as low quality wires if the plug boots aren't fully seated.

[98v70dad]

What happens if you run it up to about 80, throw it into neutral
and let it roll through your vibration speed with the engine
disconnected from the drivetrain? Just a thought.

I did that several times on different days a few months ago. The vibration is still there. I honestly think that it's the passenger side cv axle, but the carrier bearing and the wheel bearing are also suspect because there is a slight droning noise that goes with it. Normally I wouldn't suspect the bearings at 155k miles but my daughter drove this car for 6 years and she was prone to running it up over curbs and medians going about 20 mph.

[98v70dad]

Here's the deal. It is possible that the plug wire on that cylinder was not fully seated on the plug tip and that there was some little bit of arcing between the connector and wire. Use a spray contact cleaner on that wire and always use dielectric grease on the plug tip where it inserts into the plug wire when changing plugs and you should avoid this potential problem. Sorry, but high quality wires will arc just as much as low quality wires if the plug boots aren't fully seated.

Yep. Thought of that. I'm always pretty careful about seating the wires. They get three hard pushes. Occasionally the second push seats the connector a little more. The third one doesn't do more than give me peace of mind. The wires had a good dollop of dielectric grease in them when new and still had some in there when I reinstalled but it wouldn't hurt to add some now. I drove the car to and from work on Tuesday and won't see it again until Sunday. I plan to take a closer look then. The additional grease was part of my plan. In the mean time the car is just sitting so a week wait won't hurt it.

[sleddriver]

....... my daughter drove this car for 6 years and she was prone to running it up over curbs and medians going about 20 mph.

Small wonder you're experiencing front-end vibration issues! Repeatedly doing so, subjects the front end, rims, SFB, wheel bearings, CVJ, steering, strut towers & bolts to tremendous stress.

And here I thought the car hadn't been overly abused!

The fact that it still drives straight and hasn't gone to pieces says a lot about its durability to take such repeated abuse! You may have 155,000mi, however it's been a VERY HARD, ABUSED 155k driven for 6 yrs like that.

Wow.........

[98v70dad]

....... my daughter drove this car for 6 years and she was prone to running it up over curbs and medians going about 20 mph.

Small wonder you're experiencing front-end vibration issues! Repeatedly doing so, subjects the front end, rims, SFB, wheel bearings, CVJ, steering, strut towers & bolts to tremendous stress.

And here I thought the car hadn't been overly abused!

The fact that it still drives straight and hasn't gone to pieces says a lot about its durability to take such repeated abuse! You may have 155,000mi, however it's been a VERY HARD, ABUSED 155k driven for 6 yrs like that.

Wow.........

Definitely not ideal. She didn't do it every day but it happened much more than I'd like. She's dislexic and has problem with left,/right and depth perception. Getting her driving was difficult. She ok now. One time she somehow got on a new road construction site after they sprayed on the tack coat between asphalt layers. The entire bottom of the car on the front end is coated in tack coat. That stuff is now hard as heck and doesn't want to come off... Although in most areas it isn't hurting anything. Sometimes it makes fasteners hard to remove because the sockets won't fit without chipping/cleaning the stuff off.

We intentionally bought a well used car that could take the abuse. Anyhow, absolutely everything in the suspension and front end has been replaced except for that one passenger side axle and the bearings.

[sleddriver]

Both front wheel bearings given this type of abuse. I'd also suspect both front rims are no longer round, as the low-profile tires don't provide any protection from hitting curbs.

[98v70dad]

Both front wheel bearings given this type of abuse. I'd also suspect both front rims are no longer round, as the low-profile tires don't provide any protection from hitting curbs.

I replaced all four rims a few months ago. The old ones were pretty bad. My plan is to replace the passenger side cv axle first. The passenger side axle is a 6 year old aftermarket part and I think that it's past its prime or living on borrowed time. The driver's side was replaced with an overhauled Oem axle a few months ago.

The bearings should probably be replaced at the same time but I thought I'd start with the axle and see how it goes. When I jack up the car and spin the wheels the bearings seem OK.