Rough idle and shudders while accelerating
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6th Gear
Joined: Jun 2005
Posts: 6
Likes: 0
From: Littleton
Rough idle and shudders while accelerating
Hi guys, I'm a horse-owning woman who drives a 6.0L, but knows nothing about diesel engines beyond what parts have been replaced or repaired. Thank you in advance for your help and your patience.
On Wednesday night, the truck wouldn't downshift when I was accelerating. It would get to 3000 rpm and the engine would scream, but no downshift. Naturally, it stopped doing it when I went to take it into the shop on Thursday morning and the mechanic couldn't find anything wrong. Then on my way home from the shop in the afternoon, it started to run rough while idling and to shudder while accelerating. When it did this last spring, it died in the middle of the road. Sadly, I'm now on a first name basis with the AAA tow truck driver.
Here's the rundown of recent(ish) maintenance and repairs that I can recall off the top of my head.
- Oil and fuel filter change 500 miles ago. Added Archoil 9100 with the oil change. Been using the Archoil fuel additive with most fill-ups.
- High-pressure oil pump and 4 injectors were replaced last spring
- Leece Neville alternator installed about a year ago to replace the DC Power alternator (which only lasted 2 years!!) Went through 3 Ford alternators before that.
- FICM replaced with a rebuilt one from FICM Repair about 4 years ago.
There were a few other repairs in between, but I already dropped the truck off, and the maintenance records are in the glove compartment, so I can't look them up.
Here are the readings from the ScanGuage (yes, there are a few dupes):
AVG 5.3
CPM 0.328
EGR 23
EOT 123
EOT 87.8
EVD 29
EVM 1
FIP 76
FLP 13.5
FLP 13
FMP 48.5
FSS 420
FVP 13.5
FWT 155
GPH 4.83
HPG 0.9
HPR 82.4
ICP 641
ICP 664
ICV 0.84
ICV 0.86
MAP 12.1
MFD 15
MFD 18.3
SYC 1
TFC 4.02
TFT 143
TFT 110
VFD 7.25
VFD 21.6
VLT 14
Any suggestions on what I should ask him to check when he gets there in the morning?
Thanks!
On Wednesday night, the truck wouldn't downshift when I was accelerating. It would get to 3000 rpm and the engine would scream, but no downshift. Naturally, it stopped doing it when I went to take it into the shop on Thursday morning and the mechanic couldn't find anything wrong. Then on my way home from the shop in the afternoon, it started to run rough while idling and to shudder while accelerating. When it did this last spring, it died in the middle of the road. Sadly, I'm now on a first name basis with the AAA tow truck driver.
Here's the rundown of recent(ish) maintenance and repairs that I can recall off the top of my head.
- Oil and fuel filter change 500 miles ago. Added Archoil 9100 with the oil change. Been using the Archoil fuel additive with most fill-ups.
- High-pressure oil pump and 4 injectors were replaced last spring
- Leece Neville alternator installed about a year ago to replace the DC Power alternator (which only lasted 2 years!!) Went through 3 Ford alternators before that.
- FICM replaced with a rebuilt one from FICM Repair about 4 years ago.
There were a few other repairs in between, but I already dropped the truck off, and the maintenance records are in the glove compartment, so I can't look them up.
Here are the readings from the ScanGuage (yes, there are a few dupes):
AVG 5.3
CPM 0.328
EGR 23
EOT 123
EOT 87.8
EVD 29
EVM 1
FIP 76
FLP 13.5
FLP 13
FMP 48.5
FSS 420
FVP 13.5
FWT 155
GPH 4.83
HPG 0.9
HPR 82.4
ICP 641
ICP 664
ICV 0.84
ICV 0.86
MAP 12.1
MFD 15
MFD 18.3
SYC 1
TFC 4.02
TFT 143
TFT 110
VFD 7.25
VFD 21.6
VLT 14
Any suggestions on what I should ask him to check when he gets there in the morning?
Thanks!
Fleet Mechanic
Joined: Aug 2013
Posts: 1,313
Likes: 19
From: Louisiana
What year truck do you have? If you have a late 2004 and up with the ICP on the passenger side valve cover, try this. Start the truck, pop the hood and move around the ICP pigtail harness to see if you can force the "rough running" condition. You could also unplug the ICP all together and see if that clears it up, could help determining if it's a bad ICP and/or ICP pigtail.
Not sure on the whole not shifting part, as I own a manual transmission.
Not sure on the whole not shifting part, as I own a manual transmission.
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