Author Topic: M42 weird starting issue (Read 8471 times)

slong27 · « **Reply #15 on:** December 04, 2009, 11:53:27 AM »

Pump doesn't run until crank is turning. We check this with a volt meter.
AndyC... so how did you get the 160hp

1991 E30 M42 · « **Reply #16 on:** December 04, 2009, 02:35:57 PM »

Just skimmed the post, one of my e30's used to have a long crank before it would start, it was never anything that concerned me but after doing some upgrades (removed hose nest/heater plate, 4pintle injectors, cop, k&n, and exhaust) it now wants to fire before I even turn the key. the engine turns over maybe 1/2 of a revolution before it fires, it has the fastest start of any car I have ever seen or owned.

tntempest · « **Reply #17 on:** December 05, 2009, 05:28:19 PM »

My pump primes in the #2 position once, I do not know what the conditions are for it. If you try to reprime it does not do it.

Anybody had the line from the pump to the filter break. I noticed mine is and it looks like there is no way to repair it unless you remove the tank, or splice it under the second access port under the seat. The return line looks like it can only be replaced with the tank out.

DesktopDave · « **Reply #18 on:** December 05, 2009, 09:50:11 PM »

Quote from: tntempest;82542

My pump primes in the #2 position once, I do not know what the conditions are for it. If you try to reprime it does not do it.

Anybody had the line from the pump to the filter break. I noticed mine is and it looks like there is no way to repair it unless you remove the tank, or splice it under the second access port under the seat. The return line looks like it can only be replaced with the tank out.

I'm interested in this too...not looking forward to dropping the tank if possible, yet might as well replace all those hoses & filter while I'm at it.

longms · « **Reply #19 on:** December 05, 2009, 11:00:10 PM »

Quote from: 1991 E30 M42;82489

Just skimmed the post, one of my e30's used to have a long crank before it would start, it was never anything that concerned me but after doing some upgrades (removed hose nest/heater plate, 4pintle injectors, cop, k&n, and exhaust) it now wants to fire before I even turn the key. the engine turns over maybe 1/2 of a revolution before it fires, it has the fastest start of any car I have ever seen or owned.

We replaced all the hoses in that mess under the intake, put 4 pintle injectors in, new wires and plugs and a new exhaust...it always fires but takes a little cranking before it fire over

Ramblin MAn · « **Reply #20 on:** December 06, 2009, 10:33:12 PM »

Relevant to this topic, my junk yard bosch fuel pump died a few weeks ago. When I first installed it, the car would crank a couple seconds and fire right up and idle perfectly (oncie I took care of the ICV issue). A few days before it died it would take longer and longer to to start. It would also not idle as well and I would have to keep my foot on the gas for a minute until it warmed up a little.

New pump and it's back to a couple seconds bfore starting and idling smooth again. I don't want to scare people into thinking their pumps are about to go, but it would be cake easy to put a fuel pressure guage at the fuel line to fuel rail connection just for those of you guys who agonize over that kind of stuff (like me). I have a new pump so I'm not worried. Just remember to get a guage that goes high enough

1991 E30 M42 · « **Reply #21 on:** December 06, 2009, 11:38:17 PM »

that is another thing i did, i put a walbro 255lph fuel pump

cjshelley · « **Reply #22 on:** February 02, 2010, 11:20:54 PM »

update on my similar issue - my battery was crap. it was good enough to work 98% of the time, but it wasn't cranking it quite fast enough for the fuel pump to kick on. I could hear the relay clicking erratically whilst cranking. new battery and it starts just fine.

4banger · « **Reply #23 on:** February 02, 2010, 11:30:07 PM »

Quote from: 1991 E30 M42;82589

that is another thing i did, i put a walbro 255lph fuel pump

is the walbro pump a dirrect fit?

dinu.negrean · « **Reply #24 on:** March 09, 2010, 04:08:02 PM »

Experienced the same simptoms. But not worried about it, the car has been like this for almost two years now since I bought it.
I thought about the fix but still don't know if it would be a good idea to keep the system under constant 3bar pressure even when the car is resting.

4banger: you can see the walbeo inhere http://www.srz.ro/imagini/Walbro%20255%20fuel%20pump.jpg they have made me an offer today for 145 Euro. It is an external pump so no fitting problems should arrise.