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Old 10-21-2005, 20:01   #1 (permalink)
Lloyd Cimprich
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1990 Mustang 2.3 #3 Cyl dead

I have a 1990 2.3 Mustang that suddenly started a solid misfire with loss of
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 at
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 been
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 would
have been so severely worn.

Thanks


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Old 10-21-2005, 20:01   #2 (permalink)
Ritz
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Re: 1990 Mustang 2.3 #3 Cyl dead

Lloyd Cimprich wrote:
> I have a 1990 2.3 Mustang that suddenly started a solid misfire with loss of
> 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 at
> 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 been
> 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 would
> have been so severely worn.


Extremely unlikely that the worn cam is the culprit, though if it's worn
that much it couldn't hurt to replace it once you fix the real problem.
You're losing a LOT of compression in that cylinder. You could have
any number of problems that can only be ruled out through testing:

1. Worn rings
2. Worn valve(s) or valve seats
3. Blown head gasket
4. Cracked head

Have your mechanic check things out before you waste money on the cam
(which probably won't help anyway...if it was the cam you'd be losing
compression all over, not just markedly on one cylinder).

Cheers,
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Old 10-21-2005, 22:02   #3 (permalink)
cprice@here.com
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Re: 1990 Mustang 2.3 #3 Cyl dead


Worn cam lobes will result in not enough lift at thh valve, and likely
no a loss in compression. I agree with The poster below. You have bad
valve, bad rings, broken ring(s), or other related problem with hole #3.

If you want to keep the car, go to a wrecker and buy a 2.3 longblock
and rebuild it yourself with help from a machine shop. Unfortunately a
1990 2.3 car is not likely worth a new engine from a financial perspective.

Ritz wrote:
>
>
> Extremely unlikely that the worn cam is the culprit, though if it's worn
> that much it couldn't hurt to replace it once you fix the real problem.
> You're losing a LOT of compression in that cylinder. You could have
> any number of problems that can only be ruled out through testing:
>
> 1. Worn rings
> 2. Worn valve(s) or valve seats
> 3. Blown head gasket
> 4. Cracked head
>
> Have your mechanic check things out before you waste money on the cam
> (which probably won't help anyway...if it was the cam you'd be losing
> compression all over, not just markedly on one cylinder).
>
> Cheers,


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Old 10-21-2005, 22:02   #4 (permalink)
Jim Warman
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Re: 1990 Mustang 2.3 #3 Cyl dead

Does your Mustang have the dual plug heads??? Nor sure about the cars but
the 2.3 with dual plugs has the exhaust side plugs as the "primary" ignition
system...


"Lloyd Cimprich" <haffacre@echo-on.net> wrote in message
news:7b5c6$4359a02d$cf706e9b$32527@PRIMUS.CA...
> I have a 1990 2.3 Mustang that suddenly started a solid misfire with loss

of
> 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

at
> 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

been
> 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

would
> have been so severely worn.
>
> Thanks
>
>



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Old 10-22-2005, 09:01   #5 (permalink)
Lloyd Cimprich
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Posts: n/a
Re: 1990 Mustang 2.3 #3 Cyl dead

No it only has one plug per cylinder. It is too bad as the car only has
about 118,000 km (about 70,000 mi.) and otherwise is in really nice shape
with original finish. Even the A/C and cruise control still work fine.

I just tried the compression again on #3 & #2 very cold engine.

#3 30 and 40 after adding 90 gear oil

# 2 90 and 120 after adding 90 gear oil

I am begining to suspect a valve but will have to get the car into the
garage so I can take off the head and see.

Thanks.


"Jim Warman" wrote in message
> Does your Mustang have the dual plug heads???



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Old 10-22-2005, 13:01   #6 (permalink)
Big Al
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Re: 1990 Mustang 2.3 #3 Cyl dead


"Lloyd Cimprich" <haffacre@echo-on.net> wrote in message
news:b6603$435a58cf$cf705b8b$32321@PRIMUS.CA...
> No it only has one plug per cylinder. It is too bad as the car only has
> about 118,000 km (about 70,000 mi.) and otherwise is in really nice shape
> with original finish. Even the A/C and cruise control still work fine.
>
> I just tried the compression again on #3 & #2 very cold engine.
>
> #3 30 and 40 after adding 90 gear oil
>
> # 2 90 and 120 after adding 90 gear oil
>
> I am begining to suspect a valve but will have to get the car into the
> garage so I can take off the head and see.
>
> Thanks.
>


I don't know if this is true on the trucks. Some passenger cars with the 2.3
have a vacuum port on the manifold for the AC. The canister they use for a
reservoir is like a large tin can. It cracks and makes a nice leak that
kills the intake valve. I'd check into it just in case.

Al


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