My 928 will start IMMEDIATELY after a month of sitting....but the 968 is hard to start (almost doesn't) after two weeks...battery and spark are fine...just grinds and grinds...eventually catching. Something going bad? Ideas?

Harvey

 

my 89 944 does the same thing, after about 24 hrs of no use, it will turn over but wont start. Try popping the nood and pushing the throttle cable around a bit, then go back inside the car and give it a little gas and try to start it.
It works 4 me.
my .02

 

There's a check valve near the fuel pump that's supposed to retain fuel in the line between the pump and fuel rail. When it fails or leaks down the fuel pump needs to fill the lines from scratch all over again. This can take a while. The 83 does this also after 2 weeks so time to replace it I guess.

 

I had a similar situation with my 83. Replaced the FPR and now it starts right up even sitting for a week.

____________________________________
1986 944 NA - Guards Red - 90k miles
1983 944 NA - Platinum metallic - beginning a new life
1985.1 944 NA - Guards Red - donor car
1984 911 Carrera Coupe - Guards Red (gone, but not forgotten)
"If you're not living on the edge, you're not living"

 

Yeah....sound like fuel preassure / sustian leak. As mentioned above - fuel accumulator, regulator or preassure damper. Test system for preasure keeping after shutoff - see instructions in manual.

 

Has anyone done a fuel pump, check valve replacement recently on a 968? While I'm in there what other stuff might I as well do or replace? Fuel pump is the pricey part. Thanks.

Harvey

 

the Fuel filter would be another good idea.


by the way, where is this checkvalve ?

I've done fuelpump replacements on 2 cars , replaced a fuel tank (idiot previous owner drilled holes into it while making a speakerbox) and have never seen it.

I always thought it was the FPR's job to keep the fuel in the lines for extended periods.

 

The check valve screws into the fuel pump, directly between it and the fuel line going to the fuel filter.

 

Hey;

All the water pumpers have different starting characters. The early 44s will start immediately. The later Turbos, S2s, and 68s crank for a while before every start. It's just how they are set up.

The most common cause of slow starting is loss of fuel pressure when the car sits idle. Simple to hook up a pressure gauge and see what it tells you. The most common cause of this is a leaking injector(s). Then, other items in the system can leak the pressure down as well, causing the sytem to have to re-pressurize before starting.

There are lots of other things that cause hard starting, but these are ones not mentioned yet, and very common ones at that.

 

oh, that thing!