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Old 02-26-2021, 11:23 PM #16
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Originally Posted by cl4Rk View Post
Update: was just able to test. Brake feel is normal.
Try letting the truck sit for a while. Without starting the truck...step on the brakes. You should have vacuum assist on the first push of the brakes and gradual hard on the second push.
You could have a leaking brake booster check valve or leaking booster. Bottom line is booster cannot hold vacuum.
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Old 02-26-2021, 11:41 PM #17
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Originally Posted by HiLife View Post
Try letting the truck sit for a while. Without starting the truck...step on the brakes. You should have vacuum assist on the first push of the brakes and gradual hard on the second push.
You could have a leaking brake booster check valve or leaking booster. Bottom line is booster cannot hold vacuum.
Ok I’ll check it soon and post my findings. Thank you!
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Last edited by cl4Rk; 02-28-2021 at 08:42 PM.
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Old 02-27-2021, 10:49 AM #18
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Pinch off the vacuum line to the brake booster and see what happens.


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Old 12-01-2021, 01:56 PM #19
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Just to update this thread, I have not really noticed this symptom since finishing the frame swap. So I won't be able to get to the root cause unless it starts happening again.
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Old 02-08-2023, 04:01 PM #20
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Hey everyone Check your Coils you could have a failing coil and the coil is working and as your slowing Down the coil looses power then regains Power and Current spikes on the secondary winding after recovery seen this on Cylinder 1 coil and because it's a waisted spark system 2 cylinders are loosing power momentarily and then recovering to fast for a misfire..... hope it helps all if you need coil ohm specs let me know....



Quote:
Originally Posted by cl4Rk View Post
Over the last week or so, I've noticed something that I can reliably reproduce.

I'm in a 2000 automatic 4wd. I've had the truck for about 2 months now. I don't remember noticing this issue until about a week ago, but it's also possible (likely) I wasn't paying attention to it.

Anyway, with O/D Off, at about 1500 RPMs and 35 MPH, I'll experience a momentary rev drop/rebound when I apply brakes.

Here's the full picture:

Recent work (within last year, previous owner and myself):
- new radiator
- new valve cover gaskets
- new timing belt
- new battery
- new water pump
- new driveshaft
- new cat
- recent oil change
- power steering fluid exchange
- new starter
- new MAF sensor
- new spark plugs
- new coil boots
- new pcv valve
- new fuel filter
- cleaned throttle bottle/IAC
- fixed various vacuum leaks (one that thew a P0171 and another that prevented my 4WD from engaging)

Things that don't seem to matter (this happens either way):
- Coolant temp
- ATF temp
- ECT norm/pwr

Pre-conditions:
- O/D Off
- 3rd gear
- Cruising about 35 mph
- RPMs about 1500

Steps to reproduce:
- Apply brakes to slow down to about 30 mph

Symptom:
- The moment I brake, the engine quickly drops to about 900 RPM before correcting and quickly climbing back up to about 1200 RPM.

Torque converter?
Any thoughts? Something about locking/unlocking/re-locking the torque converter? since i'm in O/D Off, then brake, but not enough for a downshift? Trans fluid is at the correct level, looks pretty nice and red. I'll be adding a Magnefine filter shortly, doing a drain & fill, and adding a B&M external cooler in series. Have not tested this with 4wd engaged.

Also, is this something to be worried about?

Thanks!!
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Old 02-08-2023, 04:18 PM #21
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Quote:
Originally Posted by AntonioCm1983 View Post
Hey everyone Check your Coils you could have a failing coil and the coil is working and as your slowing Down the coil looses power then regains Power and Current spikes on the secondary winding after recovery seen this on Cylinder 1 coil and because it's a waisted spark system 2 cylinders are loosing power momentarily and then recovering to fast for a misfire..... hope it helps all if you need coil ohm specs let me know....
I hope he hasn't been waiting for 2 years for your response lol
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Old 02-13-2023, 02:49 PM #22
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Quote:
Originally Posted by AntonioCm1983 View Post
Hey everyone Check your Coils you could have a failing coil and the coil is working and as your slowing Down the coil looses power then regains Power and Current spikes on the secondary winding after recovery seen this on Cylinder 1 coil and because it's a waisted spark system 2 cylinders are loosing power momentarily and then recovering to fast for a misfire..... hope it helps all if you need coil ohm specs let me know....
Thanks for your reply, although this hasn’t happened for a couple years now since the frame swap..
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Old 02-14-2023, 10:39 AM #23
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Maybe a bad ground issue that was addressed in the frame swap.

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