I've got a '92 Ford Aerostar that's giving me accelleration problems.
Whenever I hit the gas, such as pulling onto the freeway, I lose
power. It has nothing to do with the transmission (had that checked
already), I've replaced the fuel filter, checked the pump pressure and
will be replacing the EGR valve this weekend. The lines are all
Anything else I should check?
You are probably wasting your time with the EGR valve. It
does not have the flow capacity to reduce power at full
throttle with the RPM up. It is far more likely that you
have a restricted fuel filter unless you have replaced it
since the problem started. I have had a fuel filter foul
within 10 miles after filling up with water contaminated
fuel which resulted in OK acceleration at part throttle but,
zilch at high power demands. This is why I always filled a
gasoline filter with known good fuel before installing just
like a diesel. Once the element is wet with fuel, it is
much less likely to allow water contamination to pass to the
engine in which case the filter has done it's job. If you
have a load of wet fuel, it may take addition of fuel driers
or cleaning the tank in a worst case. Another problem is a
cat that has become plugged. A lean fuel mixture or some
other problem with engine tuning can cause this. A plugged
cat can usually be found with a vacuum guage on the intake
which will show a falling reading as the engine speed is
increased slowly. Have you have a diagnostic scan done?
This can pay for itself in just one needlessly replaced
sensor unless you have more time and money you want to throw
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