Cold Start lope, why?
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Joined: Apr 2010
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From: South Shore, MA
Cold Start lope, why?
139k
Clean Oil
What are some things that will cause a lopey idle on cold start? If it sits overnight when its cold out (below 40F) - the next morning, it will crank over normally, and fire up with a VERY lopey idle. The lope will last about 10-15 seconds then idle normally. The idle doesn't 'smooth out', it just goes straight to normal idle.
I don't have a GP LED, but I can watch the voltage change (Aeroforce) when the relay disengages. And I wouldn't suspect the GPR because it fires right up - just doesn't idle smoothly.
Any thoughts?
Clean Oil
What are some things that will cause a lopey idle on cold start? If it sits overnight when its cold out (below 40F) - the next morning, it will crank over normally, and fire up with a VERY lopey idle. The lope will last about 10-15 seconds then idle normally. The idle doesn't 'smooth out', it just goes straight to normal idle.
I don't have a GP LED, but I can watch the voltage change (Aeroforce) when the relay disengages. And I wouldn't suspect the GPR because it fires right up - just doesn't idle smoothly.
Any thoughts?
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Posting Guru
Joined: Apr 2010
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From: South Shore, MA
How do I explain this to my wife???
(This could go down a very different path out of context)
15-40 Rotella. Same as last year, with No Romps.
I haven't ohmed the GPs yet. Guess I should.
Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
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From: Marseilles IL
Could be a glow plug issue. The glow plug relays go bad often. I installed a led light in my gage pod to be able to see if voltage is coming out of the relay, it doesn't tell you if the glow plugs are working only the relay. At least you will know if your relay fails.
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Posting Guru
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From: South Shore, MA
Update
I replaced the GPR with the AIH relay and it still romped. I then changed to 5/40 Delo synthetic and it hasn't romped once.
Senior User
Joined: May 2011
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From: Portland, OR
Got close to twice the miles you do and old injectors are apparently a contributor.
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I switched to Rotella T6 full synthetic and haven't had the romps since. My truck just went past 290K with the original sticks and still runs good. Complains a little if I start it without it being plugged in below 10 degrees but otherwise, no romps and runs smooth.
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