g63kaali

Hey Guys,

I have a 2013 G550, we recently got the full tune up done, replacing all coils and plugs. Full service is done and there are no codes on the OBD readers.

Sometimes when you drive the car for couple of hours, park it for 30-60 mins, try to start it again, the starter spins for like 3-5 seconds and then the car starts.

There are no issues with cold starts, cold starts are normal, 1-2 seconds max, but issue only happens when the car is warm after long drives.

I have replaced the crankshaft position sensor myself, the issue still persists, we also have checked the fuel pump and it seems to be working perfectly.

What else should I check next?

croat

I resolved my intermittent long cranks with new fuel filter.

chassis

When was the battery most recently replaced?

g63kaali

Battery says 01/22.

chassis

Starter motor is saying goodbye or there is a fuel pressure or delivery problem. With a 10 year old car I would be tempted to throw a starter at it. On the other hand, MB specifies fuel filter replacement around now. Fuel filter would be cheaper than a starter motor, if that is the issue. If it is a fuel pump it gets more expensive.

Other possibility is the CPS is going bad. What retailer did you buy the CPS from?

What is your goal or intention with this vehicle? Long term hold or dump it when repairs get more expensive?

g63kaali

I purchased the CPS from fcpeuro, so that should be good.

I love this truck, its our weekend truck to go around town. Long term goal, I haven't thought about it yet, I have a warranty on it, so it might cover some stuff. Otherwise Its a solid truck with no issues, (knock on wood).

I will take it to a German auto shop nearby me and see what they find out, it always happens when you do a 1-2 hour drive, and try to start it when the motor is hot/warm.

Cold starts are always instant.

chassis

I wouldn't assume the fcpeuro CPS is good. My policy with electrical parts is always buy from the dealer. Too much Chinesium around.

Have you had the fuel filter changed as part of the regularly specified MB maintenance?

g63kaali

Naah the filter wasn't changed anytime since I bought this truck last year, I will check tomorrow with my mechanic about it.

Apple888

I had the same problem, I fixed it with a new starter

InterimRent12

I just replaced the battery and new alternator on my 13'. Maybe check your alternator as well.

croat

It can't be battery or alternator. If it was alternator, it wouldn't charge battery and your truck would just die.
If battery is below charge, your truck wouldn't even try to crank and would either click or do nothing.

It's either starter, sensor or fuel related

Apple888

Starter 100%

BIILW

The starter has nothing to do with the extended crank time to make it start. sounds fuel related. I dont think the g even has a filter. The filter is the sock/strainer on the bottom of the fuel pump.

Apple888

I had a long crank and it was intermittent after turning it off and restarting it after 20 minutes, I changed the starter and that solved the problem 100%

how did you solve the problem? or you just guessing without knowing?

chassis

Doesn't anyone on this thread have:
- WIS/EPC
- G-Class maintenance booklet?

These resources leave no question unanswered as to what parts (e.g. fuel filter) are in the car, how to replace them, and how frequently they should be replaced.

On an old car like a 2013 G-Wagen I would throw parts at it with abandon. Fuel filter, starter, whatever it needs. It's old.

BIILW

Well i have had my own shop now for 32 years and work on a lot of mercedes as well as many high end exotics. A starters job is to turn the engine over so the intake valves open and ingest air, the fuel injector puts fuel in the cyl, and the spark plug ignites the fuel and creates a explosion to force the piston down.and in in turn the engine starts. If it starts fine cold........and takes a seconds of the motor spinning over before it starts when hot. I would suspect possibly a fuel injector leaking down and the engine needs to regain the 50lbs or so of rail pressure to fire the engine. Next time on a hot start, try just turning the key to the on position 2 or 3 times without cranking the engine ( to build fuel pressure) and then try to start . If it starts right up then, you are bleeding off fuel pressure. also how old are the spark plugs?

streborx

My experience with dirty fuel filters is they'll cause hesitation when accelerating also. If the fuel pump is faulty, there'll be low injector pressure -- there should be a pressure valve somewhere on the fuel plumbing for testing.

g63kaali

Well, just received my truck back from the mechanics, its a nice well known shop in NJ, German Auto. they have a lot of benz's lying around lol. They said it was the crank sensor, it was fully corroded, put in a new one and starts right up. Tested it out and hopefully its fixed for now.

Thanks everyone for their inputs.