Delay start and rough idle when hot.

Dec 1, 2008 | 08:33 PM

tonyML

Thread Starter

Junior Member

Joined: Sep 2002

Posts: 71

Likes: 0

From: N. CAL

'00 ML320, '07 E550

Delay start and rough idle when hot.

Hi all,

Please help to pin point what is the problem on my '00 ML320 with 115K on the clock, MAS was replaced around 40K mile, all spark plugs also replaced at 65K and 4 wires at the same time due to mis-fire on 2 of the cylinders.

Here is the symptom:

Everything working fine when the engine is cold but start running a little rough at stop only after the engine reach above 60°C and if I shut down and restart the it takes longer to fire up (about 3 time longer then normal). Also there is no power or mileage lost in the freeway and no code show up.

Thanks in advance.

Tony

Dec 2, 2008 | 10:59 AM

azinn

Senior Member

Joined: May 2003

Posts: 398

Likes: 1

From: In A Van Down By The River

2014 RX 350 F Sport, 2007 Scion tC, 2000 ML 430 Money Pit Finally Gone! Oh Happy Day!

Quote:

Originally Posted by tonyML

If you haven't replaced the CPS (crank position sensor) yet, that would be my guess. CPS failure is a common problem with this engine. My 2 cents.

Dec 2, 2008 | 11:49 AM

tonyML

Thread Starter

Junior Member

Joined: Sep 2002

Posts: 71

Likes: 0

From: N. CAL

'00 ML320, '07 E550

Quote:

Originally Posted by azinn

If you haven't replaced the CPS (crank position sensor) yet, that would be my guess. CPS failure is a common problem with this engine. My 2 cents.

I haven't replace the CPS yet but I thought the failure of CPS is causing the engine to stall while driving when hot or won't start. May be this is early sign.

What else sould I check?

Tony

Dec 2, 2008 | 12:03 PM

azinn

Senior Member

Joined: May 2003

Posts: 398

Likes: 1

From: In A Van Down By The River

2014 RX 350 F Sport, 2007 Scion tC, 2000 ML 430 Money Pit Finally Gone! Oh Happy Day!

Quote:

Originally Posted by tonyML

Hi all,

Here is the symptom:

Everything working fine when the engine is cold but start running a little rough at stop only after the engine reach above 60°C and if I shut down and restart the it takes longer to fire up (about 3 time longer then normal). Also there is no power or mileage lost in the freeway and no code show up.

Thanks in advance.

Tony

Delayed starting problem after shut down sounds like pending CPS failure to me. Also with your milage and number of years on your truck, its amazing you haven't had the CPS failure yet.

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