hard long start rough idle your thoughts?

[ben71]

takes about 7 eng revolutions before she fires and even then struggles a little. idle feels like a slight hesitation. not bad but not smooth. turning key on before start a couple of times seems to help (fuel pressure prob?). also, slightly tapping pedal after a few cranks helps too. so far have replaced dis cap, 02 sensor, cleaned throttle body, new icv, swapped mass air meters, new fuel and air filters, plugs, smoke checked for vacuum leaks and pretty sure i ohm checked tps resistance. checked so many things a couple details are getting fuzzy. anywho, just wanted to get some other opinions from some vets. little new to e30s. would fuel pressure regulator on its way out do this? bad wires, or weak fuel injectors? thanks for any help

[mamzak]

Sounds like maybe a clogged fuel filter, or possibly dirty injectors? Try replacing your fuel filter (just in front of rear drivers side tire underneath) I had similar problems and that cured it.

Next step would be to replace/clean injectors


Edit: Can't read apparently. Weird that fuel filter didn't solve it. Try injectors.

[MasukBMW]

Didn't read past the first two words of the title, I'm no longer of any use.

Best of luck to you sir,

[ben71]

yeah, replaced fuel filter week ago. got better for a few days then hard starting again. fuel filter was disgusting by the way. ran two bottles of sea foam through there afterwards with no change.

[ben71]

Didn't read past the first two words of the title, I'm no longer of any use.

Best of luck to you sir,

well at least i got your attention

[mrsleeve]

Fuel Pressure Regulator is leaking off and letting the pressure off the rail would be my next guess.

After that look into the AFM or the injectors them selves. Look for a vac leaks too

[txtorquemade]

1. Vacuum leaks
2. Injectors or seals
3. FPR you can test the pressure at the fuel rail
4. Fuel pump(s)
5. Rust inside the gas tank.

Get a smoke test for vacuum leaks.
Test your FPR
Pull the fuel pump in the tank, you dont say what e30 you have so it could have two fuel pumps. The one IN the gas tank can get clogged if you have a lot of rust in the tank itself.

Good luck

[foofopps]

I had a similar problem, injectors were leaking into the cylinder, so it was running extremely rich on start up hence why it was taking so long, after start up does the car run decent? If so Id get new injectors.

[ben71]

its an 89 325is. kind of sounds like foofopps problem. i can smell a lot of fuel after startup. little shaky at idle. runs fine through rpm range. ive got some 19# injectors i might just go ahead and install and check bottom of tank and fpr. thanks for all the feedback