[v12-engine] 90 XJS 12 B Bank exhaust Whop, whop, whop

I have been out of action for 6 months and have just tried
to run the Jag. The A Bank purrs. The B Bank runs but
exhaust is whop, whop, whop. I tried Kirbert’s diagnostic
formula and placed a dollar bill on the exhaust. It does
not suck in, just blows out with a whopping sound at idle.
exhaust is hot. Same as A bank. I have tried the 5, 10 20
and the $100 and the results do not get any better. Sounds
like this might be expensive. I installed a new cap and
rotor, new wires and plugs o.025 and switched the
amplifiers. Also changed the coils. No Change…If I
rotate the throttle 1/16 or 2 mm it revs and then drops rpm
before regaining the speed. It is the same for about 1/8th
inch 4mm and it does the same. Above this rpm it does not
drop but the exhaust still whops. If I take it for a
drive, the acceleration is very sluggish and it is skipping
badly…little power. Similar to a melt down but this is
not the problem. It will get up to speed but I am afraid
to run it any further. Cats are not hot. I tried pulling
the B injector clips one at a time. Could not tell
anything. As soon as an injector is pulled out of the
line, the engine compensates and the rpm stays the same.
Last fall I had a B bank failure caused by the rotor arcing
outside of the dist shaft. The burn ran on the outside of
the plastic and then burnt thru. A cat was glowing for a
short time. I instantly cut the engine and had the car
towed home. Changed the cap and rotor and then began
having a slight skip although the car ran fine. Hope ya’ll
have a pleasant answer and fix.
Best, Harry, 90 XJ-S 12 Convertible.–
48 Saloon
Charlotte, NC, United States
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In reply to a message from 3210 sent Tue 17 Jun 2014:

Whop,whop…correction…meltdown was on a bank. Harry–
48 Saloon
Charlotte, NC, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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