Grumbly/rough downshifting
05-24-2012, 07:15 PM
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Grumbly/rough downshifting
I have a Canadian 1992 Civic CX hatchback, manual transmission.
Downshifting into 2nd or 3rd, when I let off the clutch there isn't a smooth increase of RPMs, rather it's grumbly and stuttery. I've driven other standard cars and this doesn't seem to happen.
Engine (D15B7) has about 200,000 km (124,000 mi) on it.
Downshifting into 2nd or 3rd, when I let off the clutch there isn't a smooth increase of RPMs, rather it's grumbly and stuttery. I've driven other standard cars and this doesn't seem to happen.
Engine (D15B7) has about 200,000 km (124,000 mi) on it.
Last edited by mashed_taters; 05-24-2012 at 07:25 PM. Reason: Misc
05-25-2012, 04:57 PM
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Re: Grumbly/rough downshifting
I'm the third owner of the car. The engine was replaced at about 124,000 mi for reasons unknown to me. I have no idea when the clutch was last replaced either.
Edit: We figure the clutch may have been done when they swapped the engine, which means the clutch has about 73,000 mi on it.
05-26-2012, 06:56 AM
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Re: Grumbly/rough downshifting
shuddering on engagement can be due to:
- Slippage caused by heat checking (hot spots) of Flywheel and/or Pressure Plate, worn Pressure Plate springs (less likely), Oil/Grease contamination of Friction Disc.
- Worn motor mounts.
Try to listen for a muffled squeal as it tries to engage.
Have a friend check for twisting of the engine/transmission in the engine bay as you lightly release the clutch with the parking brake on (make sure he's on the SIDE of the vehicle).
You can also shift from 2nd to 4th while accelerating hard and note whether it bogs the engine significantly.. a good clutch will nearly stall, while a slipping clutch will increase RPM without much acceleration.
Heat checking (hot spots) can really only be checked visually. It will show up as a brownish-bluish pattern on the Flywheel or Pressure Plate surfaces.. this is bad, as these spots can't be machined nor grinded off. Unfortunately, this requires disassembly.
Just relaying what I've learned this semester. Hope this helps.
Have A Great Drive!
JasonGhostz
- Slippage caused by heat checking (hot spots) of Flywheel and/or Pressure Plate, worn Pressure Plate springs (less likely), Oil/Grease contamination of Friction Disc.
- Worn motor mounts.
Try to listen for a muffled squeal as it tries to engage.
Have a friend check for twisting of the engine/transmission in the engine bay as you lightly release the clutch with the parking brake on (make sure he's on the SIDE of the vehicle).
You can also shift from 2nd to 4th while accelerating hard and note whether it bogs the engine significantly.. a good clutch will nearly stall, while a slipping clutch will increase RPM without much acceleration.
Heat checking (hot spots) can really only be checked visually. It will show up as a brownish-bluish pattern on the Flywheel or Pressure Plate surfaces.. this is bad, as these spots can't be machined nor grinded off. Unfortunately, this requires disassembly.
Just relaying what I've learned this semester. Hope this helps.
Have A Great Drive!
JasonGhostz
05-26-2012, 02:05 PM
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Re: Grumbly/rough downshifting
shuddering on engagement can be due to:
- Slippage caused by heat checking (hot spots) of Flywheel and/or Pressure Plate, worn Pressure Plate springs (less likely), Oil/Grease contamination of Friction Disc.
- Worn motor mounts.
Try to listen for a muffled squeal as it tries to engage.
Have a friend check for twisting of the engine/transmission in the engine bay as you lightly release the clutch with the parking brake on (make sure he's on the SIDE of the vehicle).
You can also shift from 2nd to 4th while accelerating hard and note whether it bogs the engine significantly.. a good clutch will nearly stall, while a slipping clutch will increase RPM without much acceleration.
Heat checking (hot spots) can really only be checked visually. It will show up as a brownish-bluish pattern on the Flywheel or Pressure Plate surfaces.. this is bad, as these spots can't be machined nor grinded off. Unfortunately, this requires disassembly.
Just relaying what I've learned this semester. Hope this helps.
Have A Great Drive!
JasonGhostz
- Slippage caused by heat checking (hot spots) of Flywheel and/or Pressure Plate, worn Pressure Plate springs (less likely), Oil/Grease contamination of Friction Disc.
- Worn motor mounts.
Try to listen for a muffled squeal as it tries to engage.
Have a friend check for twisting of the engine/transmission in the engine bay as you lightly release the clutch with the parking brake on (make sure he's on the SIDE of the vehicle).
You can also shift from 2nd to 4th while accelerating hard and note whether it bogs the engine significantly.. a good clutch will nearly stall, while a slipping clutch will increase RPM without much acceleration.
Heat checking (hot spots) can really only be checked visually. It will show up as a brownish-bluish pattern on the Flywheel or Pressure Plate surfaces.. this is bad, as these spots can't be machined nor grinded off. Unfortunately, this requires disassembly.
Just relaying what I've learned this semester. Hope this helps.
Have A Great Drive!
JasonGhostz
Thanks again, all who replied!
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