1996 XJ6 won't stay running
#1
1996 XJ6 won't stay running
Hi there, so i have a 96 xj6 and have been having issues and it sucks. So i replaced the mass Airflow sensor because when i put it on the computer its not reading it. When i unplug it does nothing. Funny thing is when i take the air intake off the throttle body the car will stay running but if i have it on it won't stay running. I'm lost. I had a mechanic tell me the ecm might be bad but he's not sure. I have no codes. When i do have the intake off i cant rev the motor to quick or it will die. Any help will be appreciated i miss my jag
#3
#4
When you lose certain sensor inputs to ECU it by design will default to a less then optimal set of data maps , you are not at replacing the ECU
Since the engine is originally today a bit out of wack in one way or another the ECU in doing this finds your weakness
To test the MAF the middle wire on the MAF connector should read 1.2 volts DC at the correct idle speed of X
as you throttle up the engine it should climb to but not at the reference voltage of 5.0 DC
The TPS can be tested in the same way on it's middle wire starting at 0.60 + or - 0.02 volts DC at the idle stop
What you don;t want to see is any bips to 0 volts indicating a bad spot on the TPS wiper arm
This ts very precise and should be read with a digital meter
As you slowly rotate the butterfly open you should see a smooth increase in voltage towards that 5.0 reference
This defaults the ECU back to that mode when it sees 0 volts
since the TPS connector is under the throttle body you can nick the wire insulation as it comes over the fuel rail . The wire color is Y
See page 57 and 16
http://www.jagrepair.com/images/Auto.../jagxj1996.pdf
eDITING
Since the engine is originally today a bit out of wack in one way or another the ECU in doing this finds your weakness
To test the MAF the middle wire on the MAF connector should read 1.2 volts DC at the correct idle speed of X
as you throttle up the engine it should climb to but not at the reference voltage of 5.0 DC
The TPS can be tested in the same way on it's middle wire starting at 0.60 + or - 0.02 volts DC at the idle stop
What you don;t want to see is any bips to 0 volts indicating a bad spot on the TPS wiper arm
This ts very precise and should be read with a digital meter
As you slowly rotate the butterfly open you should see a smooth increase in voltage towards that 5.0 reference
This defaults the ECU back to that mode when it sees 0 volts
since the TPS connector is under the throttle body you can nick the wire insulation as it comes over the fuel rail . The wire color is Y
See page 57 and 16
http://www.jagrepair.com/images/Auto.../jagxj1996.pdf
eDITING
Last edited by Lady Penelope; 03-28-2019 at 09:34 AM.
#5
#6
Check that the TPS connector is on , I found mine was just sitting on there because the locking clip was missing
Vee had the suggestion on twisting the pins / blades on the connector a bit to make better contact
THE MAF for the normally aspirated engine is different then the one for the supercharged engine
Continuing to edit above post
Vee had the suggestion on twisting the pins / blades on the connector a bit to make better contact
THE MAF for the normally aspirated engine is different then the one for the supercharged engine
Continuing to edit above post
Last edited by Lady Penelope; 03-28-2019 at 09:18 AM.
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BrentGardner
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
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03-09-2019 06:34 PM
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