85 240 DL Not so good mileage on recent rebuild

Hey all,

Recently rebuilt my buddy's 85 240 DL engine (2.3L
F version) auto trannie. Did all tune up parts including:

Timing Belt, Motor Mount, Rod Bearings,Piston Rings
Wire Set, Rotor, Cap, Fuel Filter, Spark Plugs
Air Filter, and Coil. Also, new ECM wire harness
(updated due to the crappy insulation on the
factory one) and gave the ICM wire harness a little
help as well, though we did not replace it.

When we reset the timing, we noticed that it was
pretty lazy to advance on sharp throttle up.
Kinda weird, but we tuned it to as close to 12
degrees +/-2 as we could. The idle was also a little
shaky, so that made it more difficult.

After doing this, I got about 150kms on 24 Litres of fuel, to me
this is pretty lousy mileage. Just wondering
if anyone out there has any experience and can
let me know:

1. Is this acceptable fuel economy for this car?

2. Is it possible that the Ignition control
module is faulty or needs to be replaced or
looked at?

Thanks
t

 

Hi,

Regarding your fuel consumption, 150 km on 24 litres is atrocious! That's
equivalent to 16 litres per 100 km. Your consumption should be closer to 10
litres per 100 km.

A couple of questions:
Is black smoke pouring out of the exhaust?!
Are the brakes dragging??

Andy I.


| Hey all,
|
| Recently rebuilt my buddy's 85 240 DL engine (2.3L
| F version) auto trannie. Did all tune up parts including:
|
| Timing Belt, Motor Mount, Rod Bearings,Piston Rings
| Wire Set, Rotor, Cap, Fuel Filter, Spark Plugs
| Air Filter, and Coil. Also, new ECM wire harness
| (updated due to the crappy insulation on the
| factory one) and gave the ICM wire harness a little
| help as well, though we did not replace it.
|
| When we reset the timing, we noticed that it was
| pretty lazy to advance on sharp throttle up.
| Kinda weird, but we tuned it to as close to 12
| degrees +/-2 as we could. The idle was also a little
| shaky, so that made it more difficult.
|
| After doing this, I got about 150kms on 24 Litres of fuel, to me
| this is pretty lousy mileage. Just wondering
| if anyone out there has any experience and can
| let me know:
|
| 1. Is this acceptable fuel economy for this car?
|
| 2. Is it possible that the Ignition control
| module is faulty or needs to be replaced or
| looked at?
|
| Thanks
| t
|

 

disallow schreef:

No. My dad's '83 244 (B23A engine) needs about 9.5l to 10.5l/100km, so
somewhere around 15l should be enough for 150km.

Groetjes,

Maarten

 

I notice the mileage really goes down hill on that fuel system when the
oxygen sensor stops working. This sends the computer to a default fuel
map that is quite rich.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

No black smoke, and its running relatively well
after the timing was readjusted. Maybe I just need
to drive it a bit.

Brakes are not dragging, we checked.

On the rear tires, is this a limited slip differential?
Just noticed that when we spin one tire, the other
one does not move very much, whereas on a normal
diff, it would spin in the opposite direction.

t

 

Is there a way to test the O2 sensor?

t

 

Are you sure the cam timing is good? As in, does the notch on the
cam gear line up with the notch on the cylinder head when the
crankshaft is TDC? The engine will run with the cam advanced one or
two notches on the belt, but with worse mileage. It will also run
with the cam retarded by one or two notches, but with slightly
improved mileage and reduced power.

 

Timing is bang on, marks line up perfectly. I
noticed that the timing advance on quick throttle
is a little 'lazy'. In other words, it doesn't
advance as quickly as it could, I wonder if the
ICM is a little lazy?

I will have to drive it some more. I have to
keep very close tabs on where I am driving, since
the speedometer is not working. Otherwise I don't
know how far I have driven! lol

t

 

Perhaps it's just the expansion of the universe affecting your indirect
measurement of mileage. For all the work you've done on the car, ya' might
as well fix the speedometer.

 

Very funny...

The big question on this car (not mine, my buddy's)
was where to draw the line. As of now, he is outta
cash, so whatever else is wrong and can't be
'tweaked', is gonna have to wait.

t

 

If you have a high impedance analog voltmeter with a 0-1 volt scale,
then the oxygen sensor output (black wire) should jump back and forth
several times per second, centered around .45 V, after warmup. Digital
meter displays don't refresh quickly enough to show this, but if you
only have a digital meter, then if it jumps around and stays below 1
volt, then it's probably working.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)