I change the Glow Plug Relay, Temp-senser, Glow plug timer/module and checked all 4 Glow Plugs. This symptoms only happens when my truck is standing over night/when engine is cold...
You have a faulty connection somewhere in your wiring. When engine is started, computer automatically places the engine into "cold start" mode. Don't be concerned about the whit smoke, that's just unburnt fuel when the mixture is enriched in cold start. After warm-up, cold start is shut down and all is normal. I said at first a possible wiring connection imbalance, not sure on this point, but the engine should do the cold start thing with the smoking and higher RPMs as soon s it fires up. I've no idea why the 10 second delay. Thing is, there's really nothing wrong, except for the delay after initial start-up.
SOURCE: 99 olds alero 2.4
I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.
SOURCE: 2004 diesel hard to start when cold
It sounds more like the glow plugs, the older models had trouble out of the module, but the 6.0 is pretty safe from all those problems. And don't forget to use the correct fuel additive for diesel engines, it helps .
SOURCE: TDI Hard Start
This could be an Injector But, Not likely. Try this First, It is a long shot But, It is Cheaper. Replace your Gas cap. You could be Sucking air into the Tank from a Bad Gasket on the Gas Cap Causing your Hard Start.
SOURCE: check engine light comes on and car idle's and
I found this; if it helps.
The injectors need to be cleaned, if an engine is experiencing any of the classic symptoms of dirty injectors, such as lean misfire, rough idle, hesitation and stumbling on light acceleration, a loss of power, and higher hydrocarbon (HC) and carbon monoxide (CO) emissions.
Lean misfire may also trigger a misfire code and turn on the Check Engine light on 1996 and newer vehicles with OBD II systems. The code often will be a P0300 random misfire code, or you may find one or more misfire codes for individual cylinders, depending on which injectors are most affected.
the web page was:
http://www.aa1car.com/library/2003/ic30336.htm
Hope this helps
SOURCE: My 2007 sprinter has difficulty turning over on
The problem is your engine heater booster is running all the time. You will need to replace the dash switch that controls the heater boost (even though not lit) is sending a message to the water control valve to turn on. Replace the switch and it will start up every time on a cold morning
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