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  #1  
Old 01-05-2003, 04:05 PM
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Join Date: May 2002
Location: Orange County,CA
Posts: 190
E320 starting problem

My wife had problem starting the E320 a couple of weeks ago and over the weekend I experienced the same. I had to press the gas pedal to get it to start. I did check the OVP and it already has been replaced with the replacement 000 540 67 52 (along with the wiring harness). It starts fine now but I would like to fix the problem before happening to my wife and kids again.
Thanks!
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68 280SE Coupe restored
01 Audi A8L
05 Volvo XC90 AWD
85 CJ7 (Rockcrawler) GM 5.3 Vortec
02 Excursion XLT 4X4 PSD 700lbs. torque
78 Jeep J-10 4x4 (project)
84 Jeep Wagoneer (donor vehicle)
02 Carson HD Car Hauler

David
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  #2  
Old 01-05-2003, 05:35 PM
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Maybe it's a fuel pressure problem.

Have you checked your fuel pressure regulator?
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #3  
Old 01-05-2003, 07:25 PM
Jackd
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Possible causes:
1) The engine needs a tune-up (spark-plugs, wires, distributor cap, rotor)
2) Fuel pressure regulator (as mentionned by the previous reply)
3) Clogged fuel filter
4) Weak fuel pump
5) Dirty injectors
6) Inoperative cold start valve injector
7) Defective temperature sensor
8) Defective check valve in the fuel system
9) Bad electrical contact at coil
10) Tired battery
or a combination thereof.
JackD
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  #4  
Old 01-05-2003, 07:31 PM
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
All are good points, except #1. This engine has all electronic ignition. There is no distributor cap, rotor, or spark plug wires. This engine has a coil pack, with three coil wires and three high tension leads that "piggy-back" to the next cylinder (each coil wire is responsible for firing two cylinders).

As the coil wires are made of solid copper, they rarely go bad. So the suggestion here would be to replace the three resistor boots on the three coil wires - about $7 each. An engine with a miss is usually due to a poor connection between one of the boots and its coil wire.

My best guess is the problem is still a fuel pressure / supply problem.
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #5  
Old 01-05-2003, 08:24 PM
Jackd
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Thanks for the head-up Suginami. You're totally right on the subject of electronic ignition. I've been living in the dark age for almost 12 years with my 1989 where new the technology was not still invented.
I too would be looming at the fuel system first.
JackD
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  #6  
Old 01-06-2003, 01:09 PM
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Join Date: May 2002
Location: Orange County,CA
Posts: 190
Thanks. I will try fuel regulator. Is it near by the OVP?
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68 280SE Coupe restored
01 Audi A8L
05 Volvo XC90 AWD
85 CJ7 (Rockcrawler) GM 5.3 Vortec
02 Excursion XLT 4X4 PSD 700lbs. torque
78 Jeep J-10 4x4 (project)
84 Jeep Wagoneer (donor vehicle)
02 Carson HD Car Hauler

David
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  #7  
Old 01-06-2003, 03:28 PM
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Join Date: Apr 2002
Location: Surrey, Uk
Posts: 254
So far, no one has mentioned the fuel pump relay. Next time it won't start give the relay a tap with the handle of a screwdriver.
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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)
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  #8  
Old 01-06-2003, 08:04 PM
Jackd
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The fuel pressure regulator is located right besides the fuel pumps in front of the right rear wheel (under the car, and under a black plastic cover) The OVP is located behind the battery in the engine compartment.
JackD
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  #9  
Old 01-06-2003, 09:00 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
E320 fuel pressure regulator is in engine compartment.
Front , left side , 2" fowardward of the dip stick handle.
It has a vac hose connected to it . [ a bad regulator usually has gas coming out the vac hose ].
6" rearward of the dip handle is a fuel pressure test port. That will tell all fuel pressure conditions with a gauge attached.
You are looking for :
46-52 psi at idle
54-61 psi at idle w/vac disconnected
43 + psi after 1/2 hr. rest . [ pressure hold test]
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  #10  
Old 01-07-2003, 12:42 PM
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Join Date: May 2002
Location: Orange County,CA
Posts: 190
Great. I will try it. BTW, what kind of pressure gage should I buy to do the test?
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68 280SE Coupe restored
01 Audi A8L
05 Volvo XC90 AWD
85 CJ7 (Rockcrawler) GM 5.3 Vortec
02 Excursion XLT 4X4 PSD 700lbs. torque
78 Jeep J-10 4x4 (project)
84 Jeep Wagoneer (donor vehicle)
02 Carson HD Car Hauler

David
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