245 Air Mass Meter

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I have a 91 245 with about 230,000 miles. The car smells a bit rich,
but we don't have emissions testing here so I don't know for sure if
it's a problem. The odometer hasn't worked in years, so I can't
estimate mileage that way either. The oxygen sensor has been replaced
recently with a genuine Bosh non-universal sensor, and the guts of the
catalytic converter fell out a couple of years ago.

I have a set of (supposedly) good used injectors to go in, but I thought
before I took the car down for work, I would see if there's a simple
test to see if the Air Mass Meter is working properly. If I'm going to
tear it all apart, I might as well replace what's needed...

TIA,
Jeff

(reply to Usenet, please, this address doesn't exist)
 
I have a 91 245 with about 230,000 miles. The car smells a bit rich,
but we don't have emissions testing here so I don't know for sure if
it's a problem. The odometer hasn't worked in years, so I can't
estimate mileage that way either. The oxygen sensor has been replaced
recently with a genuine Bosh non-universal sensor, and the guts of the
catalytic converter fell out a couple of years ago.

I have a set of (supposedly) good used injectors to go in, but I thought
before I took the car down for work, I would see if there's a simple
test to see if the Air Mass Meter is working properly. If I'm going to
tear it all apart, I might as well replace what's needed...

TIA,
Jeff

(reply to Usenet, please, this address doesn't exist)
Click to expand...


Usually they either work or they don't. They tend to fail intermittently
at first, then die completely and the car won't start until you unplug
it, or starts and dies.
 
I have a 91 245 with about 230,000 miles. The car smells a bit rich,
but we don't have emissions testing here so I don't know for sure if
it's a problem. The odometer hasn't worked in years, so I can't
estimate mileage that way either. The oxygen sensor has been replaced
recently with a genuine Bosh non-universal sensor, and the guts of the
catalytic converter fell out a couple of years ago.

I have a set of (supposedly) good used injectors to go in, but I thought
before I took the car down for work, I would see if there's a simple
test to see if the Air Mass Meter is working properly. If I'm going to
tear it all apart, I might as well replace what's needed...

TIA,
Jeff
Click to expand...

A good place to start is the old-fashioned look at the spark plug insulators
surrounding the center electrode. They should be a bone color or slightly
tan. If the engine is usually running rich they will be darker, with medium
grey to black being an indication that it's a problem.

It is rare for an AMM to drift out of adjustment; more common failures cause
the engine to run badly, especially at idle.

Mike
 
I acquired an '85 245 which smoked dark smoke, most especially at idle;
WAY too rich.

I replaced the AMM: problem solved.
 
Hi Jeff,

If you suspect the AMM, pull the plug. Clean the pins and the sockets with
Contact Cleaner, push the plug in and pull it out ten times and then coat
both with Dielectric Grease. (Replace the
plug...........................:-)

I can't help re *testing* the AMM, but the above procedure got me going when
my '93 245 Classic wouldn't even start.

Good Luck.
Andy I.


:I have a 91 245 with about 230,000 miles. The car smells a bit rich,
: but we don't have emissions testing here so I don't know for sure if
: it's a problem. The odometer hasn't worked in years, so I can't
: estimate mileage that way either. The oxygen sensor has been replaced
: recently with a genuine Bosh non-universal sensor, and the guts of the
: catalytic converter fell out a couple of years ago.
:
: I have a set of (supposedly) good used injectors to go in, but I thought
: before I took the car down for work, I would see if there's a simple
: test to see if the Air Mass Meter is working properly. If I'm going to
: tear it all apart, I might as well replace what's needed...
:
: TIA,
: Jeff
:
: (reply to Usenet, please, this address doesn't exist)
 
Typically, how much are air mass sensors new, and is it worth fitting a "low
mileage" second hand item
or do they deteriorate with time as well ?

Thanks

Nick
 
Nick said:
Typically, how much are air mass sensors new, and is it worth fitting a "low
mileage" second hand item
or do they deteriorate with time as well ?
Click to expand...

$155 for a rebuild, $315 for new Bosch (through fcpgroton.com).

I pulled a couple good ones from a wrecking yard.

Tip: bring a VOM to test them before you pull them: look to the Bentley
bible for specs.
 
Mr. V said:
$155 for a rebuild, $315 for new Bosch (through fcpgroton.com).

I pulled a couple good ones from a wrecking yard.

Tip: bring a VOM to test them before you pull them: look to the Bentley
bible for specs.
Click to expand...
Hi, thanks for the tip, and prompt reply.

I guess a VOM is what we call a multimeter here in the UK ?
Am I checking for certain resistance between certain points ?

Thanks,
Nick
 
Nick said:
Hi, thanks for the tip, and prompt reply.

I guess a VOM is what we call a multimeter here in the UK ?
Am I checking for certain resistance between certain points ?

Thanks,
Nick
Click to expand...


Yeah, technically a VOM is an analog meter and multimeter refers to a
digital one that measures more than volts and ohms. You can tell a few
simple things with a meter but the only reliable way to test an AMM is
in a car. Just buy from a wrecker that will accept returns of defective
parts.
 
You should purchase The Volvo 240 Service Manual, put out by Bentley
Publishers, aka "The Bentley Bible."

IPD carries it.

It's all laid out there.
 
Mr. V said:
You should purchase The Volvo 240 Service Manual, put out by Bentley
Publishers, aka "The Bentley Bible."

IPD carries it.

It's all laid out there.
Click to expand...

OK thanks for the info - I am in the UK and I have not noticed "Bentleys" in
the Shops - our mainstream book publisher is "Haines"
and from the reputation they are not a patch on Bentleys.

Thanks again
Nick
 
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