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Matt
Matt, Engineer
Category: Australia Car
Satisfied Customers: 21991
Experience:  Automotive Engineer for 20 years, BEng hons degree,
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Kia pregio van with 2700 diesel engine, starts well when

Customer Question

kia pregio van with 2700 diesel engine, starts well when cold but once heated up will not turn over until it cools down again then starts with out trouble. Have fitted a new battery and new starter motor your help would be appreciated Garry
Submitted: 2 years ago.
Category: Australia Car
Expert:  Matt replied 2 years ago.

hello 1st check that the main battery cables are on tight and the terminals are clean and bright. Do the same for the engine / gearbox earth strap.
Then follow the main positive lead back to the engine and down to the starter motor, and check the connection at this end as well.

There should also be a small wire to the motor which should have 12V when you're turning the ignition switch to crank. If the 12V isn't there, check back along this wire for damage to the insulation or corroded connections

This 12V feed comes directly from the ignition switch so this may be faulty and need replacing

Check the resistance of the main positive lead that runs down to the motor as anything more than a few ohms and it should be replaced

Don't forget to try a jump start from another car / battery as its possible the battery is poor, if you have a voltmeter a healthy battery should read 12.7+V

also try substituting the battery for another as I've known a very flat battery to drag down the system voltage too far even with jump cables

one other thing to consider is that the immobiliser is faulty and preventing the starter from being enabled - however if the dash / ignition lights are on then this usually means that its off

If this is all OK then its possible the car needs a new starter motor

Customer: replied 2 years ago.
Matt if you had read my question correctly you would have been aware that all your suggestions had already done ( new battery, new starter motor, all wiring checked and voltage and ohms checked.) Also set the valves, to no avail . My question is wether this engine has a crank position sensor, as the problem seems to point to this. Waiting on your reply Garry
Expert:  Matt replied 2 years ago.

Hello Garry

I do alpologise, thought you said it won't turn over so I took this to mean it wasn't cranking

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 sensor is the older 2 wire type you can measure its resistance to check its condition as it should be 200-300ohms between the pins

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Expert:  Matt replied 2 years ago.

Hi

do you still need help?

Bear in mind that the site takes a deposit from you at the beginning andthis is held by the site until you rate my answer at which point the cash is splitbetween the site and the expert. so if my answers have been helpful please ratemy answer.

Customer: replied 2 years ago.
Hi Matt, problem is still not fixed, all your suggestions had been tried before I asked the Question. The problem seems to point to a static lockup but I can't pinpoint the cause will get back to it in a couple of days. I'm going to pull the injectors and test them to see if they maybe the trouble. Will let you know the result. Garry
Expert:  Matt replied 2 years ago.

hello Garry

thats a good idea

If the EGR valve is stuck open then this too can effect starting so try disconnecting it to see ifthis 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

Expert:  Matt replied 1 year ago.

Hi

do you still need help?

Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. so if my answers have been helpful please rate my answer.