Re: 1990 Mustang 2.3 Cyl # 3 dead
You need to do a cylinder leakdown test. I don't think your problem is a
worn cam, I'd be more inclined to think you burned a valve.
"Lloyd Cimprich" <email@example.com> wrote in message
>I have a 1990 2.3 Mustang that suddenly started a solid misfire with loss
> power. When I asked if there was and unusual bang, crunch, clatter, etc.
> just before the loss of power the answer was no. When I went to drive the
> car home I am quite sure that for a brief second it ran on all four.
> When I pulled the plugs all were fine except #3 which had large (not oily)
> deposits on the centre and side electrode.
> I replaced plugs with new with no improvement. I quickly removed the plugs
> and tested compression, throttle closed and engine cool. This showed # 3
> 30 and rest at 90. Adding a bit of oil to #3 gave 40.
> At the suggestion of a local rebuilder I removed rocker cover and checked
> cam. Sure enough the lobes were very worn, looked like about 1/16" had
> worn off all lobes. When I reported this to the rebuilder he was quite
> confident this (cam wear) was my problem and suggested I install a cam kit
> (about $200) or bring head in for rebuild/cam kit.
> Any advice/insight would be appreciated, especially as to why the cam
> have been so severely worn.