Cold start, Unable to drive.

[vfstyles]

start the car and use a multimeter to read sensor output.

backprobe the sensor while running and check voltage at idle. open the throttle by hand and record the change in voltage. your readings should be in the 0-5v range.

[fiftytakedowns]

the fuel pressure was perfectly fine, how do I check the TPS?

[vfstyles]

check the TPS and fuel pump.

[fiftytakedowns]

Ok after I replaced the afm I thoought the cold start would be better. Not the case. Seemed almost worse. Also my milage seems to down a bit.

[fiftytakedowns]

is there a way to test those damn things?

[Danny]

O2 sensor or something fuel related.

I take it back, its your coil packs.

[fiftytakedowns]

replaced the AFM, not the AFM. Hesitates and sputters at 3K

[fiftytakedowns]

We checked the fuel pressure, and it was normal.
Where would I check out the "live data"?

I am not quite sure it would be the 02 sensor, because the car passed smog right before I bought it, unless the person I bought it from swapped it out, with the cat right after it got approved.

[Liam]

Does it buck and kick kind of?

It is an odd one you have there.

I would want to see the "live data" from the DME before I guessed at a diagnoses but the first thing that comes to mind is the O2 sensor (this will not make sense to a lot of techs here because the logic will seem backwards to them).

My second guesses would be the fuel pressure regulator or TPS.

Without seeing on proper BMW diagnostic equipment what computer is doing I'm really shooting in the dark.

[fiftytakedowns]

*sigh*

I took it to my shop, and replaced the coolant temperature sensor, triple checked for vacuum leaks, and cleaned out the AFM, in addition to attempting to adjust it with the little screw behind the plug. Not much of a help..

Checked fuel pressure, checked plugs, both good.

I am guessing it is probably the AFM, because when we searched for vacuum leaks with brake clean,inake cleaner (the fumes change the idle) it smoothed out the idle when it was at the very beginning of the Intake before the filter.

also plugged in a BMW Diagnostics computer. No help. It had diagnosis code 10 not lsited as anything on worldpac. and that was the number we got. (we plugged the mini computer into the jack right near the brake fluid at the lip of the hood.

HELP I want this fixed!

[fiftytakedowns]

my 88 528e does the same thing, sometimes when its cold, anything over 1/4 throttle will make it bog terribly. if you lift throttle slightly, it will rev to about 3500rpm, but no higher in each gear until it warms up a little (maybe 3 miles at 40mph). but it doesn't always do it, and the first time it happened i thought i had blown the head gasket or something because of how bad it ran. if you just hold the gas pedal down it makes a sound like anti-lag on a rally car, but through the intake, not the exhaust.

I am not sure how to respond to this.





but the car does need new plugs, although I dont know how that would only affect warm up period. Thanks

[ieatpeople]

my 88 528e does the same thing, sometimes when its cold, anything over 1/4 throttle will make it bog terribly. if you lift throttle slightly, it will rev to about 3500rpm, but no higher in each gear until it warms up a little (maybe 3 miles at 40mph). but it doesn't always do it, and the first time it happened i thought i had blown the head gasket or something because of how bad it ran. if you just hold the gas pedal down it makes a sound like anti-lag on a rally car, but through the intake, not the exhaust.

[BraveUlysses]

How old are your plugs?

[fiftytakedowns]

My check engine light only goes on sometimes, right after I turn on the motor, then it goes away after a couple of minutes. never goes on when I am driving though.

I will try the engine codes thing. see what I can get.

I might have an easier way to describe the problem also.

as the car warms up the number(Rev) for which it chokes out, and the motor decelerates increases at the same rate as the needle moves along the temp gauges. For example chokes out at 1500 RPM completely cold and then 2000RPm at about 1/4 distance, etc... Also chokes out or bogs, when I am just revving up the motor.

There is also a bumpy,surging Idle until the motor is cold.

Thanks

[fiftytakedowns]

I took a look at the engine bay looking for anything that could be corroded or any leaks that could occur. There was definitley no vacuum leaks that were obviously apparent. The hoses were all replaced by the PO.

I am stuck upon what could be the problem. I have to wait about 10 minutes to drive the car, or else it will agressively bog down at 1500 RPM. Sometimes sputter