Jaguar Forums - Jaguar Enthusiasts Forum - 1996 XJ6 won't stay running

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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

Quote

Welcome to the forum James,

I've moved your question from General Tech Help to X300 forum. This is the place to post technuical questions about your model.

Graham

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 :icon_dance-disco:

eDITING

I will check that out on the sensor. If that is reading that what else could it be. Its weird that it will idle fine with the intake off the throttle body. But wont start with it on.

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