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Guest
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 Posted: Wed Nov 14, 2007 2:19 am Post subject: Looking for user history regarding their solution for MPG dr |
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My MPG suddendy fell almost 90%, and then another 30% with the next
gas tank.
The dealer pretty much hinted that they would rip me off, since my car
is OBD-I (88' injector V6 Olds).
What I'm looking for is personal history of people who dealt with a
problem like this and what was the final cause that got the car back
from the dead.
Basically, I'm looking for pointers to start self-diagnistics.
In my case - air filter is clean, spark plugs/wires are relatively
fresh, thermostat & engine coolant sensor are relatively new, and
report ok on the dash.
I do know that the cat is somewhat clogged, but in the past in the
similar condition it didn't cause the MPG drop to such extent.
Car rides very smooth, which probably means that there's no rust on
brakes/wheels.
In the essence, I'm close to be making only 1/3 of normal mileage at
this point, highway or not. |
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Mike Y
Guest
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| Posted: Wed Nov 14, 2007 2:19 am Post subject: Re: Looking for user history regarding their solution for MP |
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<array7@inbox.com> wrote in message
news:1194995152.488533.151800@e9g2000prf.googlegroups.com...
| Quote: | My MPG suddendy fell almost 90%, and then another 30% with the next
gas tank.
The dealer pretty much hinted that they would rip me off, since my car
is OBD-I (88' injector V6 Olds).
What I'm looking for is personal history of people who dealt with a
problem like this and what was the final cause that got the car back
from the dead.
Basically, I'm looking for pointers to start self-diagnistics.
In my case - air filter is clean, spark plugs/wires are relatively
fresh, thermostat & engine coolant sensor are relatively new, and
report ok on the dash.
I do know that the cat is somewhat clogged, but in the past in the
similar condition it didn't cause the MPG drop to such extent.
Car rides very smooth, which probably means that there's no rust on
brakes/wheels.
In the essence, I'm close to be making only 1/3 of normal mileage at
this point, highway or not.
|
Standard tune-up first. Then check the O2 sensors. And don't forget
the ignition wires. My 93 Intrepid had a mileage drop. A big one.
I did the simple tune-up, filters and plugs. Then the O2's (what a pain!).
Finally did the wires. The wires were the single biggest improvement.
I'm back up to the high 20's with 195K miles.
One tip. The Intrepid was 'surging' on the highway with the cruise on.
Not bad. It was REAL bad before I changed the O2 sensors. But
the wires got it all fixed. |
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aarcuda69062
Guest
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| Posted: Wed Nov 14, 2007 2:19 am Post subject: Re: Looking for user history regarding their solution for MP |
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In article
<1194995152.488533.151800@e9g2000prf.googlegroups.com>,
array7@inbox.com wrote:
| Quote: | My MPG suddendy fell almost 90%, and then another 30% with the next
gas tank.
The dealer pretty much hinted that they would rip me off, since my car
is OBD-I (88' injector V6 Olds).
What I'm looking for is personal history of people who dealt with a
problem like this and what was the final cause that got the car back
from the dead.
Basically, I'm looking for pointers to start self-diagnistics.
In my case - air filter is clean,
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Dirty air filters do not effect fuel mileage despite what the TV
commercials claim.
| Quote: | spark plugs/wires are relatively
fresh,
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Are they the right ones and correctly installed/routed?
| Quote: | thermostat & engine coolant sensor are relatively new, and
report ok on the dash.
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The is absolutely no dash readout that correlates to whether or
not fuel is being delivered in the proper quantities.
| Quote: | I do know that the cat is somewhat clogged, but in the past in the
similar condition it didn't cause the MPG drop to such extent.
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"Somewhat clogged?" That's like my sister in law being somewhat
pregnant.
It's either clogged or not clogged.
Anything that changes the volumetric efficiency of the engine
(plugged cat) will have a major effect on fuel economy.
Measure the exhaust back pressure. Test, don't guess.
| Quote: | Car rides very smooth, which probably means that there's no rust on
brakes/wheels.
In the essence, I'm close to be making only 1/3 of normal mileage at
this point, highway or not.
|
You've neglected to divulge what model this car is but if it has
a Mass Air Flow Sensor, I'd be really suspicious and start
looking there IF resolving the plugged exhaust doesn't put things
100% back to normal. |
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