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Old 07-27-2003, 02:59 PM
zorin's Avatar
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Join Date: Feb 2003
Location: Ottawa, Canada
Posts: 126
Angry '88 260E will not start

'88 260E
It cranks and turns but no start.
I checked for the sparks. It is there but not sure if it's on time.
I unscrewd the fuel inlet to the fuel distributor. When I crank The fuel pours out ok. I guess this means the Fuel pump relay is OK.
The distributor cap and wires are few months old.
It seems that the fuel is not making it to the cylinders.(after cranking I pulled out a plug and it still was dry)

Any other things I can check?

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Old 07-27-2003, 05:34 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Check to make sure the fuel pump runs while you crank -- if it is going bad, you may not get enough fuel. Just pumping fuel with no real pressure won't work -- fuel pressure has to be something like 40 psi for the injectors to open. Dirty fuel filter will cause this too.

You can also gently press down on the mass flow sensor flap while cranking, this will deliver more fuel -- have a care, you can damage the fuel distributor.

You might also pull the cap and see what condition it and the rotor are in -- the rotors have been known to fail, and it if is well off center, the spark could be going to the wrong cyinder. Not likely if you cannot smell gas on the plugs, though.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 07-27-2003, 06:28 PM
zorin's Avatar
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Join Date: Feb 2003
Location: Ottawa, Canada
Posts: 126

Thanks Peter,

I shorted pin 87 and 30 under the fuel pump relay. I could hear the pump running. Then I pressed on the flap couple of times and heard the injectors blow fuel as I did that. Now that I was sure that there was fuel at the cylinders I cranked until the engine started. But I had to keep the rev past 3500 RPM for it to stay running. I left it running like that for a couple of minutes then when I let it idle till it stalled.

I think I have screwed up the fuel/air mixture control.( with the allan key on top of the Air Mas flow control). The diagnostic pin shows about 70 percent duty cycle with the ignition on, engine off. Without the engine running how can I adjsut it back to the way it was before I screwed up?

Any suggestion will be appriciated.
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Old 07-27-2003, 06:32 PM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Check the DIY section on top of this page!

Here is a shortcut!
'86 300E
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Old 07-27-2003, 11:21 PM
zorin's Avatar
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Join Date: Feb 2003
Location: Ottawa, Canada
Posts: 126
Cool Thanks! Starts OK now.

Thanks you for the suggestions. I turned the mixture adjusting screw on top of the Air Mass flow meter util the resistance on the flap felt ok. The I recharged the battery since it was almost drained with all the unsuccessful cranking. The engine then started. While the engine was running the duty cycle was stuck at about 90 percent. I adjusted the screw a bit more and the it started fluctuating at about 50 percent. Perfect.


'86 300E manual
'88 260E
'84 944
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