97 E320 difficult warm start
Thread Starter
Newbie
Joined: Jun 2008
Posts: 4
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From: Greenwich, CT
1997 E320
97 E320 difficult warm start
if I run my e320 until it gets to normal running temperature and switch of the ignition and let it sit for anywhere from about 20 minutes - 2 hours (a.k.a if I don't let the engine return to its cold outdoor air temp) it has a difficult time starting. the engine hesitates to start and requires double the cranking time before it fires up.
if I shut off the warm engine and start it back up within 15 minutes it starts as it normally should.
I took the first preliminary step and replaced the plugs, but that didn't solve anything.
anyone have a similar experience, or advise on what the problem may be?
if I shut off the warm engine and start it back up within 15 minutes it starts as it normally should.
I took the first preliminary step and replaced the plugs, but that didn't solve anything.
anyone have a similar experience, or advise on what the problem may be?
Senior Member
Joined: Apr 2007
Posts: 278
Likes: 0
1997 s320, 1997 e320
cps (crankshaft positioning sensor)??? that would be my guess, and they are not that expensive, around $70-80. haven't changed one yet, but from what the others have mentioned, it takes like 5 minutes to change if you know where it is located and have the right tool.
Member
Joined: May 2006
Posts: 197
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1997 E320
Mine did this a couple of times when I put 92 octane gas from BP. When I use 91 octane from other places it is fine. We don't have any other places with 92 or higher octane in stupid Iowa besides BP. you might try a different brand of gas or go one octane up or down to see if it makes a difference (I'm not suggesting going below 91 though). I would love to run mobile1 93 octane if it was available here.
Member
Joined: May 2003
Posts: 95
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From: Washington DC Area, USA
E430 4matic 2001 & ML430 2000 both Silver / Ash
I have read other similar complaints leading to the CPS (Crankshaft Positioning Sensor) My guess is your CPS dying as tirona mentioned.
Here is one of the complaints I found with same symptoms you have.
LINK: https://mbworld.org/forums/showthrea...&highlight=cps
Search for CPS and you will find many with same symptoms on this forum.
Here is one of the complaints I found with same symptoms you have.
LINK: https://mbworld.org/forums/showthrea...&highlight=cps
Search for CPS and you will find many with same symptoms on this forum.
Member
Joined: Jan 2008
Posts: 154
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From: Sugar Land Texas
ML320
doesn't sound like a crank sensor the symptom would not start when hot and would re start after sitting 20-30 minutes, you might be losing fuel press. and vapor lock is occurring,fuel pressure regulator i believe it is part of the fuel filter on that model
Newbie
Joined: May 2014
Posts: 3
Likes: 0
E430
reviving this old thread. my newly bought mb does exactly the same thing--and i just changed the crankshaft and cam sensors so i know the problem is not cause by those (of course, there's always the possibility that i just happened the bought (new) bad sensors.
is there a way to verify if it's the "fuel pressure regulator"? searched these key words in title search and only one hit by pelican parts.
sorry, i'm new to MBs and am a new DIYfer. thanks in advance!
is there a way to verify if it's the "fuel pressure regulator"? searched these key words in title search and only one hit by pelican parts.
sorry, i'm new to MBs and am a new DIYfer. thanks in advance!
