Doppelgänger

iTrader: (12)

So the car is back on the road and I noticed something pretty quickly today. While driving at highway speeds, 60mph+, it seems my load required to maintain a constant speed is higher than it should be. Normally, I'd be looking at 16-12mmHg of vac. while holding speed. Now I'm in the 11-9mmHg range on the gauge. This might not sound too bad.... or maybe it does. It has also caused me to go through 1/2 a tank of gas in about 100mi. of highway cruising, far more than normal.

Car holds normal vac. at idle/decel.
AFRs are good (dither between 14.6-15.2 when crusing).
No obvious problems anywhere else.
Not leaking fuel anywhere.

Halp?

Fireindc

iTrader: (13)

Did you do anything else to the car around the same time? Did it sit for very long? Stuck brake caliper?

18psi

iTrader: (76)

Timing is sync'd properly?

Doppelgänger

iTrader: (12)

It did sit while the engine was being replaced- but in a garage. See detailed reply below.

IIRC we checked that before installing the engine and all was well.


I've noticed that pretty much under 3k RPMs in any gear, that holding 10mmHg causes me to accelerate- as seems correct- while 18-16mmHg would hold a steady speed. But on the highway, anything above that RPM level, 10mmHg is holding a steady speed. Might this come down to ignition advance timing? Might more timing help with this?

18psi

iTrader: (76)

Sync timing as in the engine with the ecu, not the timing belt

or does the faghydra not do that?

curly

iTrader: (25)

Very true, you have to sync to the hydra. But I have no idea how unless it's a MS.

Fireindc

iTrader: (13)

is the new motor a different compression ratio?

Doppelgänger

iTrader: (12)

Negative- its still 10:1

codrus

First thing I would do is double-check the timing belt alignment.

--Ian

Doppelgänger

iTrader: (12)

I will be doing that this upcoming week when I go in to check/adjust the valve lash.


I'll look into the Hydra stuff...perhaps even get some logs and post them up.