XJ6 & XJ12 Series I, II & III 1968-1992

xj12c miss

 
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Old 11-09-2011, 11:33 AM
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i have a question ....i have a miss on the right side of my v12 . i did a compression test , checked the injectors , power to the injectors, made sure i had spark to the plugs. im stuck on what to check next .... any suggestions ?
my second question is .... is it possible to strip all the polution control crap off the engine with out hurting the engine or the vaule of the car ?
 
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Old 11-09-2011, 01:47 PM
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I'd do what you suggest, in fact I'd go the whole hog and install fuel injection from an XJS, and dump all that emissions junk. That would certainly add to it's value, not devalue it, and improved throttle response, fuel economy and performance - in fact it opens up a whole new world of possibilities ;-)
 

Last edited by Sean B; 11-09-2011 at 01:50 PM.
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Old 11-09-2011, 02:09 PM
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Checked the injectors....how?


Cheers
DD
 
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Old 11-09-2011, 02:14 PM
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Originally Posted by Doug View Post
Checked the injectors....how?


Cheers
DD
missed that bit!
 
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Old 11-09-2011, 04:17 PM
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what about the air injection rail ... if i pull that is there a way to plug all the holes or somthing i can buy to plug them ? as for the injectors i pulled them, and tested them ...then atfer i put them back used my meter to see if power was making it to the injetors.
 
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Old 11-09-2011, 04:27 PM
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Any change between hot and cold? If OK initially I'd suspect the ignition amp. If it is an original Opus it is way past its best. As a stop gap solution you could open the box and replace the electrolytic capacitors but the permanent cure is new internals (ReOpus from NZ or new box from I think SNG Barratt or one of the others).

Some aftermarket dizzy caps are bad even when looking perfectly good, same for rotors.

Check with a stethoscope (mechanics' rod type) that the clicking sound from the injectors are similar.

Finally you could have an intermittent ignition or injection fault due to fried wiring in the engine valley.
 
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Old 11-10-2011, 05:28 PM
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ok i will check the electrolytic capacitors as soon as i can .... thank you so much for the info guys !!!
 
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Old 11-14-2011, 09:48 PM
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is it possable to remove the air injector rail ? will the car run with out it ?
 
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Old 11-15-2011, 08:33 AM
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Originally Posted by pak308 View Post
is it possable to remove the air injector rail ? will the car run with out it ?
Yes as long as you plug the holes in the manifold airtight. The sole purpose is to introduce extra air to burn unburnt hydrocarbons aka pollution.
 
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Old 11-15-2011, 07:08 PM
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ok i have news today i had my opus ignition amp thingy checked and the main compacitor was bad . its a 0.002mf 600v plus i found a place to buy a repus here in the US its about $424.95 if anyone is looking for one the phone number is 1-800-444-5247 i talked to a guy named John in parts department
 
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Old 11-16-2011, 08:29 PM
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ok i put the new compacitor in the ign amp box had it checked out again . reinstalled it back in the car and still have the miss . whats the next thing i need to chase down ?
 
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Old 11-17-2011, 06:41 AM
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Start by standing at the rear and hold your hands about 20cm from the exhaust engine running. Feel for an uneven beat.
Check the coil to cap lead with an ignition lamp just illuminating a dark surface and preferably at dusk. If no obvious miss try one plug lead at a time and note your findings.
Get back to us with the results.
 
 
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