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Old 06-14-2005, 01:11   #1 (permalink)
Tom Levigne
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1988 Ford Bronco II valve noises?

Hello,

I just bought a 1988 Bronco II that has very noisy valves. Its a 2.9
engine with 127,000 miles.

I think the previous owner drove it like this for a long time without
getting this fixed.

Do you think the engine is damaged?

What else is usually a problem with these vehicles?

thank you


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Old 06-14-2005, 01:11   #2 (permalink)
Scott
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Re: 1988 Ford Bronco II valve noises?


"Tom Levigne" <toml37@excite.com> wrote in message
news:jk7re.3177$eM6.3030@newsread3.news.atl.earthlink.net...
> Hello,
>
> I just bought a 1988 Bronco II that has very noisy valves. Its a 2.9
> engine with 127,000 miles.
>
> I think the previous owner drove it like this for a long time without
> getting this fixed.
>
> Do you think the engine is damaged?
>
> What else is usually a problem with these vehicles?
>
> thank you


Hello,

I am on the second of these broncos with the 2.9 and both have
lots of noise from fuel injection or something, but I sure don't
think its valve noise. Sounds sort of similar though.



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Old 06-14-2005, 01:11   #3 (permalink)
TranSurgeon
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Posts: n/a
Re: 1988 Ford Bronco II valve noises?


"Scott" <homealone.com> wrote in message
news:11aq8v2198ut307@corp.supernews.com...
>
> "Tom Levigne" <toml37@excite.com> wrote in message
> news:jk7re.3177$eM6.3030@newsread3.news.atl.earthlink.net...
> > Hello,
> >
> > I just bought a 1988 Bronco II that has very noisy valves. Its a 2.9
> > engine with 127,000 miles.
> >
> > I think the previous owner drove it like this for a long time without
> > getting this fixed.
> >
> > Do you think the engine is damaged?
> >
> > What else is usually a problem with these vehicles?
> >
> > thank you

>
> Hello,
>
> I am on the second of these broncos with the 2.9 and both have
> lots of noise from fuel injection or something, but I sure don't
> think its valve noise. Sounds sort of similar though.
>


but not as bad as the 'sewing machine
2.8'.....................................


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Old 06-14-2005, 01:11   #4 (permalink)
Al Bundy
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Posts: n/a
Re: 1988 Ford Bronco II valve noises?



Tom Levigne wrote:
> Hello,
>
> I just bought a 1988 Bronco II that has very noisy valves. Its a 2.9
> engine with 127,000 miles.
>
> I think the previous owner drove it like this for a long time without
> getting this fixed.
>
> Do you think the engine is damaged?
>
> What else is usually a problem with these vehicles?
>
> thank you


I remember a lot of those engines back then had mechanical lifters.
They put some in the pickups and even the Aerostar occasionally. I
don't know if the Bronco II could have had one also. If so, that would
be a huge source of noise unless adjusted regularly. A trained ear
would be able to tell.

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Old 06-19-2005, 15:01   #5 (permalink)
nobody
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Posts: n/a
Re: 1988 Ford Bronco II valve noises?

Tom Levigne wrote:
> Hello,
>
> I just bought a 1988 Bronco II that has very noisy valves. Its a 2.9
> engine with 127,000 miles.
>
> I think the previous owner drove it like this for a long time without
> getting this fixed.
>
> Do you think the engine is damaged?
>
> What else is usually a problem with these vehicles?
>
> thank you
>
>


You'll get other answers/opinions; but broken/loose valve keepers are
one (very expensive if not fixed) cause of valvetrain noise. I can
personally verify that one. Dropped valves are not conducive to the
block; head(s); piston(s) or your wallet.

Another is lifters and/or oil problems. The 2.9 has hydraulic lifters;
and they do "drain down" (get empty) when the vehicle sits for a few
days. That will cause a hell of a rattle for a short time until they
refill with oil. That's fairly normal. But if the oil pressure is low or
there's severe sludge blockage on the oil galleries feeding the lifters;
it ain't gonna stop.

If you have a Ford "oil pressure?" gauge in the dash; don't trust it.
It's just an idiot light in disguise. It only shows no-half-full; with
no real scaling. It will show "half scale" with anywhere between 5 and
80 lbs of pressure.

What I'd do on the valve clatter is add one of the commercial oil
flushes and run it for a few miles to clean out the passages (and the
lifters as well-they get gummy as well); then change oil *AND* filter.
Run the next oil change "short" (less than 500 miles) and do the flush
again; with another oil and filter change. (reason is that the sludge
may not gome out all at one time; and it can clog up the filter.)

As for other problems:
Automatic trans: The AO4LD is pretty weak as stock. Ford designed it
with 6 "planet gears" in the carriers; but the beancounters cut it down
to 3 each. A good rebuild fixes that and a myriad of other problems.
Raising the line pressure means harder shifts; but better life.

Manual trans : Also weaker than it should be. I'm no expert on these;
but I've heard that a later ('92 on) tranny is far better.

Rear driveshaft: Weak CV joints and "high angles" cause problems. Most
any driveline shop stocks a replacement with double Ujoints that cures
that.

Other than that; it's a decent rig if you know how to maintain it. The
other major problem is a lack of aftermarket goodies. What's out there
is either damned good but pricey or stuff you wouldn't want on a phoney
riceracer. ( I saw a Festiva with a wing and the rest of the horseshit;
about gagged.)

Hope this helps
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Old 06-19-2005, 15:01   #6 (permalink)
TranSurgeon
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Posts: n/a
Re: 1988 Ford Bronco II valve noises?


"nobody" <nobody@nowhere.info> wrote in message
news:Xekte.32680$yw4.9787@trnddc09...
>
> As for other problems:
> Automatic trans: The AO4LD is pretty weak as stock. Ford designed it
> with 6 "planet gears" in the carriers; but the beancounters cut it down
> to 3 each. A good rebuild fixes that and a myriad of other problems.
> Raising the line pressure means harder shifts; but better life.
>


good grief

first off: it's 'A4LD'

second: the 6-gear planets did not appear until the advent of the 4.0
engine

ALL earlier versions had 3-gear planetaries

third: the weak spot is the OD drum, specifically, the return springs which
bow outward under centrigugal force and get mangled by the inner clutch hub
when the band slips and the engine drives the OD assemble at 3X engine speed

amd a 'good rebuild' does not necessarily mean 'raising the line pressure;
what a good 'shift kit' does is to raise line pressure FASTER in response to
throttle opening

now, before you start in on me for 'nit-picking', or tell me all about the
A4 and how you know all out it (because you once owned a vehicle equipped
with one), let me say that I've 'had the drill' with incorrect information
on transmissions.......here, in alt.trucks.chevy, and in
alt.autos.dodge.trucks

anyone posting incorrect information is going to get corrected, and let the
chips fall where they may; I'm sick unto death of 'internet wisdom', not a
week passes without some potential customer coming into my shop clutching a
sheaf of printer paper and declaring that they have 'researched it on the
internet' and 'knows exactly what is wrong' and 'knows exactly how much it
should cost to fix'

TS



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Old 06-20-2005, 01:01   #7 (permalink)
Tom Levigne
Guest
 
Posts: n/a
Re: 1988 Ford Bronco II valve noises?

This is helpful. I am getting lots of things fixed and they told me the
exact same thing about the valves and cv joints. I bought this for $1300
and am putting about $3,000 into it. Almost no rust so hopefully it will be
worth it.

thanks
TL


"nobody" <nobody@nowhere.info> wrote in message
news:Xekte.32680$yw4.9787@trnddc09...
> Tom Levigne wrote:
>> Hello,
>>
>> I just bought a 1988 Bronco II that has very noisy valves. Its a 2.9
>> engine with 127,000 miles.
>>
>> I think the previous owner drove it like this for a long time without
>> getting this fixed.
>>
>> Do you think the engine is damaged?
>>
>> What else is usually a problem with these vehicles?
>>
>> thank you

>
> You'll get other answers/opinions; but broken/loose valve keepers are one
> (very expensive if not fixed) cause of valvetrain noise. I can personally
> verify that one. Dropped valves are not conducive to the block; head(s);
> piston(s) or your wallet.
>
> Another is lifters and/or oil problems. The 2.9 has hydraulic lifters; and
> they do "drain down" (get empty) when the vehicle sits for a few days.
> That will cause a hell of a rattle for a short time until they refill with
> oil. That's fairly normal. But if the oil pressure is low or there's
> severe sludge blockage on the oil galleries feeding the lifters; it ain't
> gonna stop.
>
> If you have a Ford "oil pressure?" gauge in the dash; don't trust it. It's
> just an idiot light in disguise. It only shows no-half-full; with no real
> scaling. It will show "half scale" with anywhere between 5 and 80 lbs of
> pressure.
>
> What I'd do on the valve clatter is add one of the commercial oil flushes
> and run it for a few miles to clean out the passages (and the lifters as
> well-they get gummy as well); then change oil *AND* filter. Run the next
> oil change "short" (less than 500 miles) and do the flush again; with
> another oil and filter change. (reason is that the sludge may not gome out
> all at one time; and it can clog up the filter.)
>
> As for other problems:
> Automatic trans: The AO4LD is pretty weak as stock. Ford designed it with
> 6 "planet gears" in the carriers; but the beancounters cut it down to 3
> each. A good rebuild fixes that and a myriad of other problems. Raising
> the line pressure means harder shifts; but better life.
>
> Manual trans : Also weaker than it should be. I'm no expert on these; but
> I've heard that a later ('92 on) tranny is far better.
>
> Rear driveshaft: Weak CV joints and "high angles" cause problems. Most
> any driveline shop stocks a replacement with double Ujoints that cures
> that.
>
> Other than that; it's a decent rig if you know how to maintain it. The
> other major problem is a lack of aftermarket goodies. What's out there is
> either damned good but pricey or stuff you wouldn't want on a phoney
> riceracer. ( I saw a Festiva with a wing and the rest of the horseshit;
> about gagged.)
>
> Hope this helps



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Old 06-20-2005, 14:01   #8 (permalink)
SnoMan
Guest
 
Posts: n/a
Re: 1988 Ford Bronco II valve noises?

"Tom Levigne" wrote:
>Hello,
>
>I just bought a 1988 Bronco II that has very noisy valves. Its a

2.9
>
>engine with 127,000 miles.
>
>I think the previous owner drove it like this for a long time without


>getting this fixed.
>
>Do you think the engine is damaged?
>
>What else is usually a problem with these vehicles?
>
>thank you


I have never seen a old 2.9 in a bronco that did not tick (though some
more so than others). They must have used lifters in them that were
prone to failure or with piddle valves that were easily fouled. It is
annouying but nothing to get upset about because it is not easy to fix
and it will not really effect engine life either.

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Old 06-22-2005, 23:01   #9 (permalink)
nobody
Guest
 
Posts: n/a
Re: 1988 Ford Bronco II valve noises?

TranSurgeon wrote:
> "nobody" <nobody@nowhere.info> wrote in message
> news:Xekte.32680$yw4.9787@trnddc09...
>
>>As for other problems:
>>Automatic trans: The AO4LD is pretty weak as stock. Ford designed it
>>with 6 "planet gears" in the carriers; but the beancounters cut it down
>>to 3 each. A good rebuild fixes that and a myriad of other problems.
>>Raising the line pressure means harder shifts; but better life.
>>

>
>
> good grief
>
> first off: it's 'A4LD'


All I can say is that's what I found in the Ford literature. If you go
looking on trans fluid cans; they also call it an AO4LD.

> second: the 6-gear planets did not appear until the advent of the 4.0
> engine
>
> ALL earlier versions had 3-gear planetaries


So why was the carrier on mine formed and drilled for 6?? I don't mean
just "holes"; but full machined at same dimension.

> third: the weak spot is the OD drum, specifically, the return springs which
> bow outward under centrigugal force and get mangled by the inner clutch hub
> when the band slips and the engine drives the OD assemble at 3X engine speed


That's the usual fail mode; I didn't say the planet gears were *the*
weak point. That's the one that "getsya" a few (40-60) thousand miles
after the OD drum fix *if* the trans was "just patched" as was done by a
lot of Ford dealers under warranty.

> amd a 'good rebuild' does not necessarily mean 'raising the line pressure;
> what a good 'shift kit' does is to raise line pressure FASTER in response to
> throttle opening


You *are* correct; but the phrase 'raising the line pressure' has been
used for so long that using the 'correct' terminology confuses most people.

> now, before you start in on me for 'nit-picking', or tell me all about the
> A4 and how you know all out it (because you once owned a vehicle equipped
> with one), let me say that I've 'had the drill' with incorrect information
> on transmissions.......here, in alt.trucks.chevy, and in
> alt.autos.dodge.trucks
>
> anyone posting incorrect information is going to get corrected, and let the
> chips fall where they may; I'm sick unto death of 'internet wisdom', not a
> week passes without some potential customer coming into my shop clutching a
> sheaf of printer paper and declaring that they have 'researched it on the
> internet' and 'knows exactly what is wrong' and 'knows exactly how much it
> should cost to fix'



To each his own I guess. I'm not up on auto trans after about 83. I
never did it as a business; either. I don't do much wrenching on my own
anymore; my day job hurts the ol' bod too much.

I am going to ask you nicely (this time) . Did I lie to the original
poster?
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