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Limp mode after motor swap. Normal?

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Old Mar 8, 2016 | 06:05 AM
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Limp mode after motor swap. Normal?

My question is it normall for a car to still be in limp mode after a motor change and the only way to get it out of limp mode is to get the abs sensor from the donor car ?This is my situation right now car is fixed running but still at shop due to stuck in limp mode. gg
Old Mar 8, 2016 | 07:48 AM
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I've never heard of anything like that. ABS sensors get replaced all the time They're plug and play. I recently replaced the whole ABS computer with one from a salvage yard and it was plug and play too.

Limp mode is usually triggered when the computer thinks that something could damage the motor. If certain sensors read out of range, or don't read at all, it'll go into limp to protect itself. They probably have a sensor unplugged.

Are they sure it's actually limp mode? Unplugging the throttle body in a 3.5 will still let the car run and actually get some throttle response. Other sensors will do the same while not actually in "limp".

Have they pulled any codes?

Last edited by Derrick2k2SE; Mar 8, 2016 at 07:52 AM.
Old Mar 8, 2016 | 09:10 AM
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I bought my sentra from a guy that couldn't get it out of limp mode after TB repair.

I reset the ECU and took it for a test drive. Problem solved lol But I didn't tell him. I did the relearns later to make sure.

Try the pedal dance.
Old Mar 8, 2016 | 12:20 PM
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Originally Posted by mrjamaica98mx
My question is it normall for a car to still be in limp mode after a motor change and the only way to get it out of limp mode is to get the abs sensor from the donor car ?This is my situation right now car is fixed running but still at shop due to stuck in limp mode. gg
I just went by the shop and it seems to be the abs acurator its a big box under rhe air box or by the air box.

Originally Posted by Derrick2k2SE
I've never heard of anything like that. ABS sensors get replaced all the time They're plug and play. I recently replaced the whole ABS computer with one from a salvage yard and it was plug and play too.

Limp mode is usually triggered when the computer thinks that something could damage the motor. If certain sensors read out of range, or don't read at all, it'll go into limp to protect itself. They probably have a sensor unplugged.

Are they sure it's actually limp mode? Unplugging the throttle body in a 3.5 will still let the car run and actually get some throttle response. Other sensors will do the same while not actually in "limp".

Have they pulled any codes?
He stated a guy came out with a computer were they put the vin # in and scanned the car and only code was abs

Last edited by NmexMAX; Mar 8, 2016 at 01:37 PM.
Old Mar 18, 2016 | 06:40 PM
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Originally Posted by Child_uv_KoRn
I bought my sentra from a guy that couldn't get it out of limp mode after TB repair.

I reset the ECU and took it for a test drive. Problem solved lol But I didn't tell him. I did the relearns later to make sure.

Try the pedal dance.

can you send me a link on how to do the pedal dance? Also can u do it with the blutooth device?
Old Mar 18, 2016 | 06:49 PM
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Originally Posted by maxinout93
can you send me a link on how to do the pedal dance? Also can u do it with the blutooth device?
http://www.nicoclub.com/archives/g35-how-to-reset-ecu-throttle-pedal-release-idle-air-volume-learning.html

You can do relearns, timing +-2 and idle adjustment with obd2, but no reset afaik.
Old Mar 19, 2016 | 09:48 AM
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Originally Posted by Child_uv_KoRn
http://www.nicoclub.com/archives/g35-how-to-reset-ecu-throttle-pedal-release-idle-air-volume-learning.html

You can do relearns, timing +-2 and idle adjustment with obd2, but no reset afaik.
thanks alot man!
Old Mar 22, 2016 | 08:54 PM
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Originally Posted by mrjamaica98mx
I just went by the shop and it seems to be the abs acurator its a big box under rhe air box or by the air box.


He stated a guy came out with a computer were they put the vin # in and scanned the car and only code was abs
Car is off to dealership to try to get them to reprogram
Old Mar 27, 2016 | 02:46 PM
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Originally Posted by mrjamaica98mx
My question is it normall for a car to still be in limp mode after a motor change and the only way to get it out of limp mode is to get the abs sensor from the donor car ?This is my situation right now car is fixed running but still at shop due to stuck in limp mode. gg
After 4 months my car is back dealer reset computer $$$$ hopefully this engine will last ...
Old Mar 27, 2016 | 03:09 PM
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Originally Posted by mrjamaica98mx
After 4 months my car is back dealer reset computer $$$$ hopefully this engine will last ...
You can pedal dance and reset the car without spending money to take it to the dealer.
Old Mar 27, 2016 | 05:45 PM
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Originally Posted by Mattx
You can pedal dance and reset the car without spending money to take it to the dealer.
I tried lol
Old Mar 28, 2016 | 04:53 AM
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Originally Posted by Child_uv_KoRn
I tried lol
Some people just refuse to listen or use the search. Why would you ever take your car to the dealer for a reset? That's just mind boggling. Ohh I didn't even read where you already told him. You even posted a link wtf??
Old Mar 30, 2016 | 08:09 AM
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Originally Posted by Mattx
Some people just refuse to listen or use the search. Why would you ever take your car to the dealer for a reset? That's just mind boggling. Ohh I didn't even read where you already told him. You even posted a link wtf??
As stated the mechanic took it the car was not in my pos
Old Mar 30, 2016 | 08:14 AM
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Originally Posted by mrjamaica98mx
As stated the mechanic took it the car was not in my pos
I hope he ate the bill for being incompetent.
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