car losing power as i drive - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sephrothm2 · 07-09-2011, 01:01 AM

'92 240sx
134,xxx miles

I have been having issues driving my car for the past couple weeks. my car has been losing power when i gas it. by losing power, i mean it feels like it pulls but its very weak. its like the rpm jumps up but there is very weak to no pull.

i have notice that it happens on hot days. i have not encountered this problem driving later at night.

Also, when this happens I noticed the engagement point on my clutch pedal is very high up, almost at the tip.

Notes on car in case its related (im a noob):
a/c low pressure hose replaced about 3 weeks ago. (A/C was working okay before this problem occurred. then my A/C lost its COLD. it is currently not working anymore [a/c light does not even turn on])

my radiator has a small leak(replacing soon)

Clutch master cylinder replaced 2 weeks ago.

jaked23 · 07-13-2011, 10:14 AM

sounds like ur clutch is slipping. try bleeding or replacing the clutch

Mishkin_707 · 07-13-2011, 08:42 PM

[QUOTE=jaked23;4144124]sounds like ur clutch is slipping. try bleeding or replacing the wouldn't a slipping clutch cause his RPM's to raise really high and the car doesn't move faster??

i have a single cam, mine does the same thing and i am not sure what is going on it's done it for years and in the cali heat makes it worse.

i would also like to find a solution cause it's so annoying now.

OP, i was messing with my car the other day when it was doing this, since you replaced the slave cylinder, when you drive your car and it does it, when you come to a stop light, try pumping the clutch pedal to "build pressure" and see if it does it still, i was doing this the other day and it seems as if it helped a lot, i replaced my slave cylinder also and im sure i haven't bled it correctly.

sephrothm2 · 07-14-2011, 12:38 AM

[QUOTE=Mishkin_707;4145296]

Quote:

Originally Posted by jaked23

sounds like ur clutch is slipping. try bleeding or replacing the wouldn't a slipping clutch cause his RPM's to raise really high and the car doesn't move faster??

i have a single cam, mine does the same thing and i am not sure what is going on it's done it for years and in the cali heat makes it worse.

i would also like to find a solution cause it's so annoying now.

OP, i was messing with my car the other day when it was doing this, since you replaced the slave cylinder, when you drive your car and it does it, when you come to a stop light, try pumping the clutch pedal to "build pressure" and see if it does it still, i was doing this the other day and it seems as if it helped a lot, i replaced my slave cylinder also and im sure i haven't bled it correctly.

I only replaced my master cylinder.
and yeah, I step on the gas pedal, the RPM's jump almost as fast as if I'm on neutral or stepping on the clutch, after jumping a few thousand RPMs it starts a very weak pull. I think the hotter it gets the worse the pull.
At one time I could barley drive it but thankfully I was in my school parking already and didn't have to drive faster than 10mph.

Mishkin_707 · 07-15-2011, 03:08 AM

oh ok, yeah thats the clutch, it's done, flywheel may be glazed also, make sure to have the flywheel resurfaced before installing the new clutch

DennisC · 07-15-2011, 07:10 PM

I'm having the same problem sometimes in my S14 too. The rpms would jump and my car isn't going any faster. So I guess it's time for a new clutch.

Mishkin_707 · 07-17-2011, 10:43 PM

Quote:

Originally Posted by DennisC

I'm having the same problem sometimes in my S14 too. The rpms would jump and my car isn't going any faster. So I guess it's time for a new clutch.

Yes sir, it's your clutch

cotbu · 07-18-2011, 01:59 AM

There are some tests you can do to verify a slipping or bad clutch. But if you have to do those tests your clutch is probably bad. Here's a couple. 1: 3gear pull cruise to the speed of 35mph in 3rd rpm and speed should match punch it, does the rpm shoot up and speed stay the same or lag really bad. slipping clutch. 2. 5th gear test. take off normally in 5th gear if you let the clutch out and the car is still running. bad, weak or slipping clutch. Engine should die way before you release the clutch in 5th.

sephrothm2 · 07-18-2011, 02:28 PM

Quote:

Originally Posted by Mishkin_707

oh ok, yeah thats the clutch, it's done, flywheel may be glazed also, make sure to have the flywheel resurfaced before installing the new clutch

thank you sir. just took it to a mechanic to test drive it and he said the same thing.

07-09-2011, 01:01 AM	#1
sephrothm2 Join Date: May 2011 Location: los angeles Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	car losing power as i drive '92 240sx 134,xxx miles I have been having issues driving my car for the past couple weeks. my car has been losing power when i gas it. by losing power, i mean it feels like it pulls but its very weak. its like the rpm jumps up but there is very weak to no pull. i have notice that it happens on hot days. i have not encountered this problem driving later at night. Also, when this happens I noticed the engagement point on my clutch pedal is very high up, almost at the tip. Notes on car in case its related (im a noob): a/c low pressure hose replaced about 3 weeks ago. (A/C was working okay before this problem occurred. then my A/C lost its COLD. it is currently not working anymore [a/c light does not even turn on]) my radiator has a small leak(replacing soon) Clutch master cylinder replaced 2 weeks ago.

07-18-2011, 01:59 AM	#8
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	There are some tests you can do to verify a slipping or bad clutch. But if you have to do those tests your clutch is probably bad. Here's a couple. 1: 3gear pull cruise to the speed of 35mph in 3rd rpm and speed should match punch it, does the rpm shoot up and speed stay the same or lag really bad. slipping clutch. 2. 5th gear test. take off normally in 5th gear if you let the clutch out and the car is still running. bad, weak or slipping clutch. Engine should die way before you release the clutch in 5th. __________________ LoverTechnologies "Half Broken Things!"

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07-13-2011, 10:14 AM	#2
jaked23 Join Date: Apr 2011 Location: st louis Age: 30 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	sounds like ur clutch is slipping. try bleeding or replacing the clutch

07-13-2011, 08:42 PM	#3
Mishkin_707 Zilvia Addict Join Date: Jul 2009 Location: everywhere Age: 39 Posts: 729 Trader Rating: (1) Feedback Score: 1 reviews	[QUOTE=jaked23;4144124]sounds like ur clutch is slipping. try bleeding or replacing the wouldn't a slipping clutch cause his RPM's to raise really high and the car doesn't move faster?? i have a single cam, mine does the same thing and i am not sure what is going on it's done it for years and in the cali heat makes it worse. i would also like to find a solution cause it's so annoying now. OP, i was messing with my car the other day when it was doing this, since you replaced the slave cylinder, when you drive your car and it does it, when you come to a stop light, try pumping the clutch pedal to "build pressure" and see if it does it still, i was doing this the other day and it seems as if it helped a lot, i replaced my slave cylinder also and im sure i haven't bled it correctly.

07-15-2011, 03:08 AM	#5
Mishkin_707 Zilvia Addict Join Date: Jul 2009 Location: everywhere Age: 39 Posts: 729 Trader Rating: (1) Feedback Score: 1 reviews	oh ok, yeah thats the clutch, it's done, flywheel may be glazed also, make sure to have the flywheel resurfaced before installing the new clutch

07-15-2011, 07:10 PM	#6
DennisC Zilvia Junkie Join Date: Dec 2010 Location: Elk Grove Posts: 581 Trader Rating: (9) Feedback Score: 9 reviews	I'm having the same problem sometimes in my S14 too. The rpms would jump and my car isn't going any faster. So I guess it's time for a new clutch.