Bouncing RPMs...
05-24-2006, 11:52 AM
#1
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Bouncing RPMs...
And before you can IACV, please read...
My RPMs bounce when under light throttle. Meaning gased around 2000 RPMs, the engine will rev slightly (200 RPMs) every few seconds. When I put the cruise control on at 70, I can stare at the tachometer. It's about every three or so seconds that the engine will rev. It's not just the gauge, I can hear the engine as well.
I wouldn't think that this is the IACV because the engine is completely normal at idle.
Any ideas?
My RPMs bounce when under light throttle. Meaning gased around 2000 RPMs, the engine will rev slightly (200 RPMs) every few seconds. When I put the cruise control on at 70, I can stare at the tachometer. It's about every three or so seconds that the engine will rev. It's not just the gauge, I can hear the engine as well.
I wouldn't think that this is the IACV because the engine is completely normal at idle.
Any ideas?
05-24-2006, 12:36 PM
#7
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Thread Starter
I definitely had this before the Thermoblok spacers. I think it might have started after the pulleys, though. Would pulleys cause this?
I also had this before I change the plugs to Denso Iridiums. So, not the plugs. Maybe a coil pack?
I have a worn spot in my AEM filter (not a hole, but almost), would that effect anything?
I also had this before I change the plugs to Denso Iridiums. So, not the plugs. Maybe a coil pack?
I have a worn spot in my AEM filter (not a hole, but almost), would that effect anything?
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05-24-2006, 01:26 PM
#11
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RPMs change at highway speeds in cruise control and your speed doesn't change? Sounds like your torque converter might be slipping.
The dealer may not have replaced the torque converter when they did your tranny.
The dealer may not have replaced the torque converter when they did your tranny.
05-24-2006, 02:30 PM
#12
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Originally Posted by fla-tls
RPMs change at highway speeds in cruise control and your speed doesn't change? Sounds like your torque converter might be slipping.
The dealer may not have replaced the torque converter when they did your tranny.
The dealer may not have replaced the torque converter when they did your tranny.
05-24-2006, 02:43 PM
#13
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Once you're transmission is in lock-up (like going 70 in cruise control on the highway) if the RPMs change, your speed should change as well. Pushing the brake, or moving the gas pedal too far (either up or down) will cause it to go out of lock-up.
Hmm - maybe you have a short in your brake switch (the one that turns your brake lights on) and it's causing you to come out of lock-up.
If you were closer, I'd have you run by the shop and we'd check it out for you...
Hmm - maybe you have a short in your brake switch (the one that turns your brake lights on) and it's causing you to come out of lock-up.
If you were closer, I'd have you run by the shop and we'd check it out for you...
05-24-2006, 02:54 PM
#14
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Thread Starter
Originally Posted by fla-tls
Once you're transmission is in lock-up (like going 70 in cruise control on the highway) if the RPMs change, your speed should change as well. Pushing the brake, or moving the gas pedal too far (either up or down) will cause it to go out of lock-up.
Hmm - maybe you have a short in your brake switch (the one that turns your brake lights on) and it's causing you to come out of lock-up.
If you were closer, I'd have you run by the shop and we'd check it out for you...
Hmm - maybe you have a short in your brake switch (the one that turns your brake lights on) and it's causing you to come out of lock-up.
If you were closer, I'd have you run by the shop and we'd check it out for you...
BTW, it doesn't matter which speed the cruise control is set at, that was just an example.
05-24-2006, 03:46 PM
#16
Senior Moderator
and it doesnt do it at all in park or neutral?
05-24-2006, 04:34 PM
#17
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Originally Posted by fsttyms1
and it doesnt do it at all in park or neutral?
05-24-2006, 05:59 PM
#18
Senior Moderator
Then id agree with fla-tls. If its only doing it while driving but your speeds arent fluctuating it sounds like a torque converter issue
05-24-2006, 07:41 PM
#19
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woot i was right!..
go to the dealership get one of em to test drive wit u, then pop up the answer, torque converter blah blah.."
first time blabbing "TRANNY" was right
go to the dealership get one of em to test drive wit u, then pop up the answer, torque converter blah blah.."
first time blabbing "TRANNY" was right
05-24-2006, 11:16 PM
#21
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Originally Posted by phipark
hmmm...I thought it was all in the same. The tranny was replaced due to a "torque converter failure."
05-24-2006, 11:34 PM
#22
Did you have the climate control on (air conditioning?). When the A/C compressor engages the ISC servo is supposed to raise the RPM just a bit to compensate for the HP loss.
05-25-2006, 08:19 AM
#24
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Originally Posted by fsttyms1
Then id agree with fla-tls. If its only doing it while driving but your speeds arent fluctuating it sounds like a torque converter issue
Oh, it's not the ECU and/or climate control.
Thanks for everyones help.
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