noob question things to check for long cranking & fire up on 2nd start

[iwantspeed]

Hey guys.
After trouble shooting some other issues, I have thrown a lot of parts at my car.

last annoying issue is that intermittently the car will take a long time to crank and will start on the first try.

other times it will not start on the first try
but start right away on the second start.

my theory is,
that the fuel pressure regulator is on its way out and is slowly letting pressure out.
on the first crank it builds pressure and on the second start it starts right away.

new parts
main relay
o2 relay
fuel pump relay
engine ground strap
crank position sensor
multimeter tested throttle position sensor
new dme temp sensor
new cluster temp sensor( while i was there kind of thing)
o2 sensor( the orginal one was installed)
fuel pump
fuel filter
rubber fuel lines
rebuilt and calibrated fuel injectors
cap, rotor, spark plugs
air filter
starter
battery
coil
things I want to replace to possibly fix this issue.

• plug leads
• fuel pressure regulator

[Mike]

You need to do a fuel pressure test first. It is very simple to do, and the cost of the fuel pressure guage is not very expensive. If you have an 325i, it should make around 43.5psi, at idle. When you shut the car down, it should hold pressure in the line as well. If not, your in the market for a new fuel pump. Some e30's have two pumps, some have one. Search for the details about what setup your car has. Stay away from those chinese ebay pumps too.

[iwantspeed]

this e30 has one intake fuel pump.

thanks for the tips

[SocalianSD]

Check your injectors also. I had a one that was leaking and flooding the cylinder which was causing my hard start. I had them rebuilt through CruzinPerformance and my car runs like a champ now! :up:

EDIT - Nvm! I read over the part you said you already have rebuilt injectors... My blunder.

[iwantspeed]

still have the same problem...

[payney8]

Check your line to from your fuel pump to the external connector. Sometimes these can leak loosing fpr after a while and no leaks can be found because it leaks back into tank

[iwantspeed]

thanks for the tip
can you be a little bit more specific?

is it a hose pictured here?

http://www.realoem.com/bmw/showparts.do?model=1113&mospid=47309&btnr=16_0303&hg=16&fg=15

[payney8]

http://www.realoem.com/bmw/showparts.do?model=1113&mospid=47309&btnr=16_0181&hg=16&fg=15

Number 14 or 20 I dont know on the twin pump set up. It's the line that runs from the pump to the external hard line on the lid. It can erode or get loose on the fittings

[iwantspeed]

ok perfect thanks

I will check it asap

[iwantspeed]

issue still persistent

[hotballs]

replace the FPR

[jlevie]

Run the fuel system tests in the Bentley. If the FPR is bad those tests will tell.

Another possibility that no one has mentioned is intake leaks. Have a smoke test run.

[iwantspeed]

still struggling with this issue guys

[digger]

get a good set of injectors, i had a similar problem many years ago and just replaced the injectors.

[iwantspeed]

injectors are rebuilt stock ones. and i think they are working properly