My '98 E39 (77k mi.) still runs well but have started feeling a
degradation of power..looking at regular service records, a service
tech at the dealership said likely intake needs to be cleaned. Can
anyone recommend an effective additive/product (available in the US)
to clean the deposits? Thanks-
What's his definition of 'intake'? The additives you're talking about could
be used to help clear up the fuel system (injectors, valves), but the stuff
readily available at the stores such as Techron Concentrate or STP or BG44K
will most likely not touch some of the more serious deposits. These
additives, I feel, are more of a preventative measure than anything else.
FYI... clogged fuel injectors can sometimes manifest themselves as unstable
And obviously, those fuel additives will do nothing for air intake. Here,
as adder1969 suggested, you should look at replacing your MAF (cleaning an
old one does not really work all that well), air filter, etc.
Mass Air Flow sensor. It measures the amount of incoming air that enters
the combustion chamber. Based on this, the computer knows how much fuel to
dispense in order to obtain a proper air-fuel mixture. As dirt accumulates
on a MAF, its performance may degrade over time.
I don't think a fresh diff fluid will help with your "degradation of power"
issues, but seeing as you're at 77k miles, it'd be a good idea to replace it
anyway. It's not a lifetime fluid, unless you only expect a life of about
100k miles out of your car.
The "standard" tune-up should do it. Plugs, Air and Fuel filters, double
dose of Techron. At 77k miles, you may consider trans and diff fluid
changes. Contrary to the literature, they are NOT lifetime. Besides, Less
than $100 for fluids beats $mucho for a new trans (plus labor, of course).
BTW, I checked my intake valves (where they said deposits were) when I did
my clutch at 170k miles. NOT A SINGLE DEPOSIT. Good gas and Techron every
4th tank. And the fuel tank was SPOTLESS and without water. So, the
"deposits on your intake (valves)" is a lot of crap. It's just a tactic to
get you separated from your money.
Bill in Omaha (mit SNOW)
Thank you all - had no idea about the LIMITED "lifetime" tranny and
diff oils..idle speed seems steady..just the power seems to have
diminished..will replace tranny and diff oils plus new sparks, oil &
fuel filters..hopefully that should make a difference..thanks, guys!
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