stupid question
#1
stupid question
Hey guys I work on diesels all day but for a refrigeration company not pickups. I picked my 01 250 7.3 yesterday in PA and drove it home. while driving home I noticed when going down hill or when you let off the throttle the RPMs drop right to idle. But other times the RPMs stop at 1000 the engine stops making any noise then drops to idle and the noises come back. This sounds stupid but I'm just curious if that is normal or could the be related to the CPS??????????
#2
#3
#5
That's not correct.
When it drops to idle the coast clutch is not on and you're in a gear lower than 4th. It does not matter if the torque converter is locked or not, it can drive the engine either way. It will spin the engine about 10% faster during coast if the converter is locked, but it will spin it either way.
If the torque converter is locked, the trans is in 1,2,or 3, and the engine goes to idle speed it means the coast clutch is not engaged when it should be.
When it drops to idle the coast clutch is not on and you're in a gear lower than 4th. It does not matter if the torque converter is locked or not, it can drive the engine either way. It will spin the engine about 10% faster during coast if the converter is locked, but it will spin it either way.
If the torque converter is locked, the trans is in 1,2,or 3, and the engine goes to idle speed it means the coast clutch is not engaged when it should be.
#6
That's not correct.
When it drops to idle the coast clutch is not on and you're in a gear lower than 4th. It does not matter if the torque converter is locked or not, it can drive the engine either way. It will spin the engine about 10% faster during coast if the converter is locked, but it will spin it either way.
If the torque converter is locked, the trans is in 1,2,or 3, and the engine goes to idle speed it means the coast clutch is not engaged when it should be.
When it drops to idle the coast clutch is not on and you're in a gear lower than 4th. It does not matter if the torque converter is locked or not, it can drive the engine either way. It will spin the engine about 10% faster during coast if the converter is locked, but it will spin it either way.
If the torque converter is locked, the trans is in 1,2,or 3, and the engine goes to idle speed it means the coast clutch is not engaged when it should be.
#7
Join Date: Jun 2006
Location: White Mnt's,New Hampshire
Posts: 9,714
Likes: 0
Received 2 Likes
on
2 Posts
Trending Topics
#8
#9
#10
That's not correct.
When it drops to idle the coast clutch is not on and you're in a gear lower than 4th. It does not matter if the torque converter is locked or not, it can drive the engine either way. It will spin the engine about 10% faster during coast if the converter is locked, but it will spin it either way.
If the torque converter is locked, the trans is in 1,2,or 3, and the engine goes to idle speed it means the coast clutch is not engaged when it should be.
When it drops to idle the coast clutch is not on and you're in a gear lower than 4th. It does not matter if the torque converter is locked or not, it can drive the engine either way. It will spin the engine about 10% faster during coast if the converter is locked, but it will spin it either way.
If the torque converter is locked, the trans is in 1,2,or 3, and the engine goes to idle speed it means the coast clutch is not engaged when it should be.
#11
Tested it last night. Flipped my TC switch and kept it locked up down into 1st gear. 15mph, 1000rpm's unlocked it. Injectors were quiet all the way down till I unlocked it.....so to answer the original posters question. Everything is fine, and yes as you were told the noise u hear is after the TC unlocks the rpms drop down to idle and the injectors are firing. Now worries man u r good
#12
#15
I think your trans is shifting from 4 to 3 when the converter unlocks. That's why it drops to idle. What you say just doesn't make sense when you understand the powerflow through the transmission.