Diesel Place banner
Cancel

Sound like a cold fuel problem?

620 Views 5 Replies 3 Participants Last post by  Scrufdog, 
Scrufdog
Needed to run out yesterday when it was 21 degrees F out, snow on the ground. Went out to truck fired her up, easily as always, let her idle for a minute to settle down then hit the high idle switch. Upon high idle the engine would make a stumble every 6 seconds or so, kinda like a quick cut off that lasted less than half a second. Since I was standing outside, while snowing, in bare feet and shorts, I left it and went inside. Came out 5 minutes later and she was purrin pretty at 1070RPM (high idle). Figured it might just be a cold fuel thing.

I currently use just over 6oz of Power Service and 2oz of 2-cycle oil. Already decided to go 8/8 starting on the next fillup.

Any ideas?
Reply
Save
Like
1 - 2 of 6 Posts
G
Fast idle is for PTO and HO alternator and hydraulic winch and other engine-driven loads at normal operating temperature - not for fast warmup at cold-start.

Erratic operation may be expected at ECT's below ~115 deg, where PCM starts throttling back from normal cold-advance\fast-idle
Reply
Save
Like
G
Sure it does, but that's not the function of switched High-idle option - you should expect some erratic operation as PCM tries to compensate for cold-start with normal parameters for cold-advance and fast-idle
Reply
Save
Like
1 - 2 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Diesel Place
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
6.5L Diesel Engine Duramax First Generation: 2001-2004 (LB7) Duramax Second Generation: 2004.5-2005 (LLY) Closed / Archived Marketplace Ads 6.2L Diesel Engine
Top