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Bad gpr or glow plugs or something else?

813 views 4 replies 4 participants last post by  Justin@DP-Tuner 
#1 ·
Since it's been getting a little chilly. It's been about 40-60's my 1999 f350 has been hard starting. Sometimes it starts just fine. Other times it's hard. This morning at 11 am it was about 55 degrees took about 6 cycles of glow plug heating and a lot of white smoke out the tail pipe to get going. On the sixth try it started immediately. Like no time at all to crank over. And then other times it starts with no trouble at all. So it seems somewhat irregular but more common in the chilly days. Thanks for your help.
 
#3 ·
The whooshing sound is the exhaust back pressure valve. It's normal to have it close when cold out. You need to check your glow plug system out. Do a search for cold starting problems on this forum. There is a good right up on the subject.


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#4 ·
Click on the link in my signature for how to check out the GP system.

At 40-50F you should still start quicker than what you're describing.

Also pull the ICP connector and see if there's oil inside the ICP sensor. If so, you need to replace the sensor. If it's sending a biased signal to the PCM, the HPOP may not be putting out enough pressure to correctly start the engine. The PCM wants to see 500 PSI to allow starting, but a goofed up signal could result in an actual pressure less than that, resulting in a coarser fuel spray that's harder to ignite.
 
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