Do not run the vacuum pot on the bottome of the distributor to ported vacuum as the system is really a vacume retard. Meaning when vacuum is applied it will retard timing. It is ment to lessen the amount of retarded timing when the throttle is opened.

 

On HE V12 with a Lucas CEI Distributor? No, it was a vacuum *advance* type system, not vacuum retard.

I believe some of the 70s vintage V12s with the Lucas/Opus ignition were a vacuum retard type system, though.

Cheers
DD

 

I decided to try something (new air pump was 700$?!?!?)...

I took the air pump off...opened it up and "poured the liquid wrench to it. Then I put a 24" pipe wrench on it...It actually came loose!!! lol

It isn't really functioning as an "air pump", but makes a great dummy pully!!!!

Just thought I'd share...in air conditioned comfort!!!

 

I know this is a rather old thread, but I have an 85 xjs and I'm pulling the motor soon and like the original poster I want to delete basically everything possible to give it a better look and remove any potential failure points. A/c compressor is junk so I will be removing that entire system as well.

So what all did you remove/plug? over run valves, air rails, air pump, a/c system, evaporator canisters? Any modifications to the crank case vent?

 

Hey Triton227,
Do you have any more pics on your engine and how you did your modification?

 

In case you didnt notice, the post you quoted is more than 5 years old as is triton's last activity.

 

I did notice. However, I've posted reply on other older posts and received a response from the member that was positive in results. Why would I think this should be any different?

 

I have the Euro Spec Idler pulley that takes the place of the Smog Pump and provides a pulley for the AC compressor. I had it shipped from Simply Performance in the UK. I have $150 in it...I'd like to get $100 plus shipping if interested.

 

Hi:
I know this is from an old post but do you still have this idler pulley kit?
Thanks

 

Sold; but a better alternative...mount a GM SI alternator in the air pumps location. Eliminates the Bosch ribbed belt which is fitted behind the other 3 belts.
Put in an electric fan kit and eliminate the crack prone engine/pulley driven fan and you have a sweet accessible setup. I have a spare GM SI if interested.

 

Do you have pics of this? Iv been wanting to rearrange the engine I can't stand the ugly fred flinstone era AC compressor either. A modern unit could fit where oem alt sits?

 

Ok thanks for the reply and advice.

 

Does anyone know if eliminating the air pump on the 6.0L V12 in a 1994 XJ12 will create a check engine light or other sensor issue? Everything I've read seems to indicate this wouldn't be an issue, but most of the forum discussion is regarding the 5.3L. Thanks.

 

I am sure it will not. Even if the system is working, it runs for less than a minute from a cold start.

 

AFAIK....

On-board monitoring of the air injection system began with the 1995 cars and the introduction of OBDII. I don't think the car has any way of 'knowing' if the pump is in place and working or not.

I'm with Greg. I don't think you'll have a problem

Cheers
DD

 

I have removed it from my 94 V12 6.0 and it does indeed throw a fault code so the check engine light is on permanently. Just an FYI. I will probably put it back on.

 

Same year / car / problem - would love to find a solution!

 

yep. check out my thread. lots of pictures. but you will see one pic of all the stuff I ripped out.

Alt is now where the pump sat. down to 2 fans from 4. (e fans now)

 

I think the problem on the later cars - such as the '94 - is how the O2 sensors react when they don't sense the air being dumped into the exhaust; but I may misunderstand how the circuit and O2 sensors work.

 

We probably need an EPROM copy from a Euro version of the ECU.