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vivaro: , i have a 2007 vivaro 1.9 cdti, when i start it…

hi, i have a 2007...
hi, i have a 2007 vivaro 1.9 cdti, when i start it cranks over and over but eventually starts..when started it runs like a dream. Had a new battery and a new starter motor last week but still cranks and cranks before eventually starting. just doing some research to see if this excessive cranking is a pump or injector problem.
any ideas would be appreciated
thanks
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Answered in 38 minutes by:
2/22/2015
UK Auto Mechanic: Matt, Mechanical Engineer replied 7 years ago
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 26,575
Experience: BEng hons Mech engineering, in auto industry 22 years
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Hello

I'd check that you're getting full power to the glow-plugs, they pull a lot of current so take care when checking but see if the relay is clicking when the ignition is turned on first and also check the fuse if this is OK check to see if the engine earth strap is also OK.

If the plugs haven't been changed in the last 20K then they may have to be replaced.

You can test the glow-plugs with a multimeter by measuring the resistance across the plug ( between the power connection and the body) it should be around 4-8ohms if its tending to infinity / open circuit the plug is faulty or by using a clip on current clamp, either on the supply wire to glow plugs or onto engine earth, with glow plug light on you should see 15-20amps for each glow plug fitted, 4 cylinders would be approximately 60-80amps.

Also if its not injecting at all then check the connections to the crankshaft sensor, unplug it and check for corroded contacts and broken wiring, and consider fitting a new sensor - do the same for the cam position sensor

If the EGR valve is stuck open then this too can effect starting so try disconnecting it to see if this helps or changes anything

Could also be an injector leaking fuel back through the overspill pipe, so not getting enough fuel pressure to tell ECU to fire the injectors, this is trickier to find and you’ll need the garage to do a ‘run back’ test to identify which one is the issue

Lastly it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.

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Customer reply replied 7 years ago

thanks for your reply.

my excessive cranking problem happens whether the engine is hot or cold...so does this rule out glow plug faults,,,sorry should of mentioned this in the first place

UK Auto Mechanic: Matt, Mechanical Engineer replied 7 years ago
Hello

on a modern diesel engine the glow plugs are used on every start , hot and cold as it helps with emissions so still worth checking that they are getting full power

otherwise replace the fuel filter as the next step
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 26,575
Experience: BEng hons Mech engineering, in auto industry 22 years
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Customer reply replied 7 years ago

ok will replace fuel filter and check glow plugs tomorrow.

i have read on many forums about fuel rail pressure on cranking and injector problems. If i had these problems would they effect the running of the van or just start up?

UK Auto Mechanic: Matt, Mechanical Engineer replied 7 years ago
Hello Chris

fuel pressure on cranking will be strongly effected by a clogged filter so its well worth doing that 1st and a clogged filter can also limit power
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