jbob711

Hey folks. My 99 c2 cab tip has been hard to start on 2 separate occasions. I turn the key and it fires for about a second then dies. and will just crank. a minute or so later it will start and then run fine. No issues. I am thinking a fuel pump relay based on some old posts. I figure its easy enough to try so i will go get one this evening and put it in.

What are your thoughts? Thanks. I appreciate it.

TonyTwoBags

There are quite a few threads on this. Search under slow start. This seems to affect all 996s.

Outputs:
- Cable connecting battery to rear engine compartment loses 1-1.5v in transmission due to it being a crappy cable. Replacement is $75 + ~2hrs labor
- Starter motor second possibility, replacement ~$300 + labor

gl

jbob711

it cranks really fast. that doesnt seem to be the issue. Thanks for the input!

jbob711

Any thought about the MAF? Once the car starts, it run like a champ. Smooth as glass with no CEL. Just a thought.

dporto

"This seems to affect all 996s."

Really? That's news to me...

FRUNKenstein

Could be your fuel pump starting to die. Take a look through this thread:

https://rennlist.com/forums/996-turb...xpectancy.html

TonyTwoBags

For this achievement, you receive one internet.

*many 996s are affected.

https://rennlist.com/forums/996-foru...ard-start.html

https://rennlist.com/forums/996-foru...ng-issues.html

https://rennlist.com/forums/996-foru...arm-start.html

https://rennlist.com/forums/996-foru...er-1-hour.html

https://rennlist.com/forums/996-foru...n-t-start.html

https://rennlist.com/forums/996-foru...ht-needed.html

one of the parts:

http://www.pelicanparts.com/cgi-bin/...07-019-01-M100

some detail from dan_189:

Ashai did a great write up on how to test.

The basics are:

- get the car hot
- turn on headlights, Ac, radio to simulate load
- check voltage from behind the alternator with a insulated bent piece of wire to get to the terminal
- check the voltage at the jump start post

If they differ the cable is cooked and needs to be replaced.

There however are other things that can cause this problem:

- crank angle sensor
- starter
- venting valve (only if the car won't start after filling gas)

Porschetech3

Just to clarify, your engine spins over fast so we can eliminate starter, cables, battery ect. There are no fault codes or any indications that the fuel mixture is lean/rich, can eliminate low/high pressure or fuel control issues.

Sounds like the fuel system is loosing it's prime. After the fuel system has built up pressure and turned off, it should hold that pressure for at least 30min, I think there is a specs of something like 1psi per min, but if there is a starting problem the drop is usually very fast like 15psi per min. On the returnless system the check valves are in the fuel pump and the fuel regulator in the tank. On the return systems the check valves are at each end, one in the fuel pump and one in the fuel regulator on the fuel rail. The most common cause of pressure drop after shutdown is the check valve in the fuel pump( of course a leaking injector will cause this also, but very rare). Hook up a fuel pressure gauge and build up the pressure then turn off and observe the drop. If the pressure drops too fast it can cause fuel to boil on a hot engine and restart will be extremely difficult, not so bad cold.

Also the firing up then dying is an indication of the fuel system loosing its prime ( the fuel in the rail can bubble hot due to pressure lose and vapor lock). The fuel in the rail is enough to fire it up, but then the bubbles enter and it dies.

AWDGuy

what kind of condition is your crankshaft position sensor?