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enging loping without accessory belt
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=86905		 Page 1 of 1
Author:  npkdm [ Sat Jul 22, 2017 10:50 am ]
Post subject:  enging loping without accessory belt
Thursday afternoon my fan bracket bearing went out. I was extremely lucky because I was in a parking lot idling at the time. The radiator and fan were not damaged. I removed the belt and drove it slowly home (2 miles). When I parked at home I noticed the engine was loping. Is this from the accessory belt not being there? Which accessory would cause that? The temp gauge was at normal straight up.
Author:  papaindigo [ Sat Jul 22, 2017 10:56 am ]
Post subject:  Re: enging loping without accessory belt
Could be related to the alternator and/or AC compressor no longer being driven by the belt. Either one could be cutting in and out and making the ECU do weird things to engine operation. Just a reminder the AC compressor can turn on/off even if AC switch is not "on" depending on what vent mode you are in.
Author:  npkdm [ Sat Jul 22, 2017 11:02 am ]
Post subject:  Re: enging loping without accessory belt
thanks for the reply. I'm curious to see if it corrects itself after I put it back together.
Author:  papaindigo [ Sat Jul 22, 2017 12:40 pm ]
Post subject:  Re: enging loping without accessory belt
I suspect it will.
Author:  WWDiesel [ Sat Jul 22, 2017 1:13 pm ]
Post subject:  Re: enging loping without accessory belt
When my alternator died a couple of years ago, I was about 10 miles from home so I drove it on home with no alternator charging.
When I got home and let it idle, it was loping and sounding weird like it was not happy. :shock:
Battery voltage was down to ~9 volts or a little less measured with a digital Fluke meter.
As soon as I replaced the alternator with a new one and charged the battery up with a charger, it started and ran perfect even at idle. The lope and weird idle completely disappeared.... :roll:

Bet yours does too! :wink:
Author:  joe_ [ Sat Jul 22, 2017 2:41 pm ]
Post subject:  Re: enging loping without accessory belt
npkdm wrote:
When I parked at home I noticed the engine was loping. Is this from the accessory belt not being there?
Most likely.

npkdm wrote:
Which accessory would cause that?
Any/all of them. The belt-driven accessories add a load on the engine (or more than anything, just additional rotating mass), causing engine speed to respond slower to fuel being added/removed. Without the belt, engine RPM can increase/decrease more quickly causing the PCM to have a hard time holding a constant RPM. Basically the belt-driven accessories act like a flywheel.

npkdm wrote:
The temp gauge was at normal straight up.
You're ok there; the water pump is driven by the timing belt on this engine so it's still circulating coolant without the serpentine/accessory belt.
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