No peddle response and car has jumping revs!
#1
Rx-8 the protege
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No peddle response and car has jumping revs!
Hay guy I just replaced my upper intake manifold and I started the car and it turns over then jumps up and down between 2000 and 3000 rpms!
Then it jumps to 3000 and stays and revs there!! Then if I give it gas all it does is drop back down and jump up and down again!
There is no response from the peddle
Then it jumps to 3000 and stays and revs there!! Then if I give it gas all it does is drop back down and jump up and down again!
There is no response from the peddle
#2
Grasshopper
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Strange... lets cover the basics...
Few things to double-check:
1) There is a vac line in the rear of the UIM for the vacuum chamber that supplies the SSV, AIR, and VDI solenoids. Make sure you didn't forget to connect that.
2) Make sure the purge line is inserted and secured (its the one with the blue clip that connects in the front of the UIM almost centered).
3) Make sure the electrical connection for the purge solenoid is inserted (on top of where the blue clipped purge line is inserted).
4) Check the VFAD nipple (should have a line if you have a VFAD or capped if you don't).
5) Reconnect the throttle body electrical connection. You can also verify the TB by observing the valve. Turn the key to the 'ON' position and have someone press on the gas pedal. You will see the valve open.
6) Check the MAF connection. Might also be worth it to clean it too.
7) Check the three lines just before the throttle body (probably not it, but worth a look-over).
Did your UIM come with the orange gaskets and/or did you use them?
Few things to double-check:
1) There is a vac line in the rear of the UIM for the vacuum chamber that supplies the SSV, AIR, and VDI solenoids. Make sure you didn't forget to connect that.
2) Make sure the purge line is inserted and secured (its the one with the blue clip that connects in the front of the UIM almost centered).
3) Make sure the electrical connection for the purge solenoid is inserted (on top of where the blue clipped purge line is inserted).
4) Check the VFAD nipple (should have a line if you have a VFAD or capped if you don't).
5) Reconnect the throttle body electrical connection. You can also verify the TB by observing the valve. Turn the key to the 'ON' position and have someone press on the gas pedal. You will see the valve open.
6) Check the MAF connection. Might also be worth it to clean it too.
7) Check the three lines just before the throttle body (probably not it, but worth a look-over).
Did your UIM come with the orange gaskets and/or did you use them?
Last edited by Jon316G; 06-18-2010 at 06:35 PM.
#3
Rx-8 the protege
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Yea It came with all 3 gaskets and I used them!!
My friend just turned the car on and stepped on the gas and nothing happened with the throttle body!
Forgot to mention I have an AEM intake
on the bottom of the UIM one with a green circle and one with a blue clip both are connected
My friend just turned the car on and stepped on the gas and nothing happened with the throttle body!
Forgot to mention I have an AEM intake
on the bottom of the UIM one with a green circle and one with a blue clip both are connected
#4
Grasshopper
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Well... with the key turned to 'ON', you should have a response from the throttle body valve when the gas pedal is pressed.
This is likely what is causing your problem.
Since you just replaced the UIM, the TB is what I would focus on before the APPS (accelerator pedal position sensors).
Check the connector to the TB and verify none of the pins got bent or pushed in.
Check for any breaks in the wires themselves.
This is likely what is causing your problem.
Since you just replaced the UIM, the TB is what I would focus on before the APPS (accelerator pedal position sensors).
Check the connector to the TB and verify none of the pins got bent or pushed in.
Check for any breaks in the wires themselves.
#9
Modulated Moderator
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Yes.......if it triggers limp mode it stays until a reset......
After a reset withthe key on....throttle works until the car is running and goes through a check routine that takes place about 5 sec after start. If it faults on first drive cycle it goes into limp mode right after that...and throttle opening is limited and the car will idle..and rev to about 3K but will allow only very small loads
This can occur with NO CEL's....and no real way to tell WTF is going on....I had his problem after a Haltech install.....I though that I had screwed something up...and spent the better part of a week of my spare time getting very intimate with the ECU, wiring harness and my scope
After a reset withthe key on....throttle works until the car is running and goes through a check routine that takes place about 5 sec after start. If it faults on first drive cycle it goes into limp mode right after that...and throttle opening is limited and the car will idle..and rev to about 3K but will allow only very small loads
This can occur with NO CEL's....and no real way to tell WTF is going on....I had his problem after a Haltech install.....I though that I had screwed something up...and spent the better part of a week of my spare time getting very intimate with the ECU, wiring harness and my scope
#11
Rx-8 the protege
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I started it a few times and I was able to rev then it started jumping and stayed at 3000 and I could gas it anymore
Lol ok so should I do another reset or what would the next step be
Lol ok so should I do another reset or what would the next step be
#21
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So..................what did we learn here?
Why did car go into limp mode in the first place, when changing out the UIM?
I learned that apparently the 20 brake pedal stomp won't reset limp mode, not sure I ever realized that, but I have never faced limp mode. (Knocks on wood!)
Why did car go into limp mode in the first place, when changing out the UIM?
I learned that apparently the 20 brake pedal stomp won't reset limp mode, not sure I ever realized that, but I have never faced limp mode. (Knocks on wood!)
Last edited by Mazurfer; 06-18-2010 at 08:24 PM.
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