Author Topic: Really bad mileage (Read 2768 times)

SiGmA_X · « **on:** May 22, 2011, 07:27:05 PM »

Evening 42ers! I just finished up a motor replacement in my gf's 318i and its getting horrid mileage. ~17mpg over 5 tanks, mpg=miles/gallons of course. The car is not entirely smooth at idle. Nearly, but not fully.

New parts:
*All timing chain components - M20 fly so used an indicator + cam blocks to set timing
*COP Conversion (new coils)
*Plugs
*O2
*Air filter
*Dyno oil (first oil change on new to us motor, will go to synthetic shortly)
*Deleted TB heater BS

Unrelated:
*All gaskets minus HG
*WP/Tstat
*M20 clutch/fly (Maybe cause of issues?)
*Compression is all even at 220psi/cyl

I scoped all sensors, everything looked good - The O2 was a bit lazy at around 800ms so I replaced it, but the new one is not really any better.... Weird its not <500ms like normal.. And nor is the MPG. So looks like I have an almost-new O2 FS...

Any input would rock, I'm getting fed up with this 4 cylinder lol. Shoulda done an M50 swap, better MPG and more power/reliability/cheaper!! :mad:

Thanks much
Roman

DesktopDave · « **Reply #1 on:** May 23, 2011, 07:17:04 AM »

Sorry you're having trouble, you should be seeing mid-20s in town, mid 30's highway. I'd check for a stuck fuel injector. With the TB hose delete you should have a rock-solid idle.

Maybe do a Mustang 19# swap?

SiGmA_X · « **Reply #2 on:** May 23, 2011, 09:21:00 AM »

You read my mind Dave! I'm bidding on some Ford/Bosch yellow tops, but not the skinny type that doesn't clip in. Super sketchy that so many people are using injectors that do not mount properly.. I have had properly mounted properly shaped injectors pop out on my e36 before due to weak clips, and a bent/not seated clip is sure to come out...

Anyway, glad to see injectors were on your mind too! Thanks sir.

nomade30 · « **Reply #3 on:** May 24, 2011, 12:44:21 AM »

I would say pull out the spark plugs to see how rich you are burning.

Just for reference the P/N of the injectors you are looking for is F2TE-A3A

SiGmA_X · « **Reply #4 on:** May 24, 2011, 12:54:34 AM »

They aren't fouled/don't appear to be excessively rich. Rather odd.

Thanks for the PN. What I was going to buy is 0280150556 which according to MotorMan is a cross reference for the F2TE-A3A. Excellent!