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1 18th March 04:25
External User
Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo


My 1996 Rodeo (V6) makes a noise that can be described as fluttering or
air compressor or diesel engine like! It has 146K miles. Last time
the timing belt was changed was at 75K. Just had a tune up and so the
spark plugs, fuel filter, air filter, PCV valve are all new. Fluids
and oil are all at normal levels.

When I start the car in the morning, it sounds like an air compressor
starting up. After driving around for a bit, it quiets down a bit.
When stopped and idling, it sounds like diesel engine and has a
fluttering noise to it. The funny part is that I filled it with 93
octane gas and the noise seemed to go away for a few days but it's back
now (even with the 93 octane). I live in Boston so it's pretty cold
when I crank it in the mornings.

Any ideas what might be going on? The mechanic suspected that it might
be bad valve covers and that replacing them is not cheap. Would
changing the timing belt solve the problem

Thanks for any ideas.

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2 20th March 06:40
External User
Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo


I currently have my '96 Isuzu Rodeo in the shop right now getting fixed
for bad idling (i.e. sometimes would stall when coming to a stop or
sometimes idling too high when coming to a stop). I too have had issues
starting it in the morning and it sounding very odd. What I usually do
is rev the RPMs to about 2k until the rough idling turns to a nice hum.

What my mechanic had just told me was that the Idle Air Control motor
grinds (part costs approx. $48). Since it's grinding due to possible
suit and/or carbon build up, changing it could cause some of that
carbon or suit to get back into the fuel system, so their going to do a
fuel system flush (approx. $120). Since they're doing that, they said
they might as well change the fuel filter as well (part costs approx.
$14). Labor, in my area, to do all this is approx. $80-$90, plus they
have to charge me for figuring out the problem (approx. $82). Throw in
tax and i'm looking at close to $400. I think I can probably get away
with the fuel system flush by just putting some Red Line injector
cleaner into the gas tank, but I guess since I have the money, might as
well get it all done.

So you could have your mechanic take a look at your Idle Air Control
motor (or even the valve) to make sure it's working (or opening and
closing) properly.

I'd like to know the outcome too, because it happens far too often that
these threads get created and problems asked to be solved, but no one
takes the time (once said problem is solved) to come back and report
the possible fix turned into the absolute fix.

Thanks & Good Luck,
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3 21st March 18:44
External User
Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo

sounds like low oil presure to me what does your guage say on the dash
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4 21st March 18:44
External User
Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo

Sounds like a typical 3.2 Isuzu to me... :-)

Or did you mean worse that usual?

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5 21st March 18:44
joe d
External User
Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo

It sounds like the hydraulic lash adjusters(lifters) have collapsed or are
sticking due to varnish build-up. An Isuzu service bulletin from 2000 (TSB
SB00-01-S009) has a two step remedy.

First step;

A. Make sure engine is fully warmed up-drive at least 15 minutes to your
local Isuzu dealer and buy a genuine Isuzu oil filter and the drain plug
gasket. Then go to your local Wally World and buy 5 quarts of 0W-30 Mobil
One oil or the equivalent.

B. While engine is still warm, drain oil completely-let it drain as long as
possible. Change oil filter and gasket on drain plug.

C. Refill with Mobil One.

D. Start engine and make sure oil pressure is OK.

E. Increase RPMs to 2500 and keep there for 30 minutes(yes, you can drive it
to re-cycle the old oil somewhere). If the noise diminishes then your on the
right track. If the noise lessens on cold starts after a couple of days then
you should schedule some time to repeat every step of this process in a
couple of weeks. After your satisfied the noise level is acceptable, then
you can go back to a good brand of 10w-40 oil(I use Valvoline) and do not
exceed 3-4k miles before a change.

If this procedure doesn't help, then go to second step.

Second step:

A. Take vehicle to a reputable facility and have them replace the problem
lash adjusters. Hang on to your wallet. Parts are expensive.
If you go this route, have them change the oil pick-up tube in the
crankcase. It clogs easily.

I reiterate, change oil every 3-4,000 miles!!!

Joe D
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6 21st March 22:52
External User
Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo

Don't you mean 6 quarts?

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7 21st March 22:52
joe d
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Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo

Maybe it holds 5-1/4 or 5-1/2 but Mobil One is not inexpensive and 3-4 qts
will do the job unless there's a massive leak. I've seen these engines run
with 1-1/2 qts. The Mobil One is cleaning the engine so you shouldn't be
keeping it in there for too long. As I said, if this improves the situation,
you could repeat the process with the M.O. and a new oil filter before going
back to dinosaur oil. You can top it off at that time(maybe with some Marvel
Mystery Oil)

Joe D
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8 21st March 22:52
External User
Posts: 1
Default Noisy idling in 1996 V6 Isuzu Rodeo're way braver than I! :-) I like to keep it within a quart of
full, but good to know it can go lower (if not caught) and likely be ok...

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