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 Post subject: Fixing a 2000 Jaguar S-Type V8 misfire. Knowledge needed.
PostPosted: Thu Aug 14, 2014 2:05 pm 

Posts: 48
Location: CNY
Hey all. So I have a friend that has a very troublesome S-Type with the AJ-28 V8 and for some reason it's coding a cylinder 2 misfire. The symptoms are very obvious such as the whole car and engine rocking slightly while idling. There's a slight extra percussive booming sound coming from the exhaust also. No abnormal engine noises as far as I can tell. Also it usually runs rich (noticeable moistness of the exhaust and smell). All the plugs are new, no water near the plugs or coils as far as I can see, was running fine after a few coil packs were replaced until my friends father gunned it to 70mph one day. Doing some non-invasive maintenance/testing first because I really don't want to have to pull the fuel rail or something... I'll hopefully be doing some further testing today. As of right now my theories are a faulty/weeping/plugged injector, bad coil, worn cam lobe, or a jammed valve. If I'm not mistaken, these engines have 5 valves per cylinder. (very well aspirated for a ford owned brand. lol) The less used extra output valve may have gotten stuck due to carbon deposits getting in the way and therefore causing compression issues. I drove it and when I accelerated quickly the engine light flashed at me for about 15 seconds.

If there's something I have wrong, or if there's something I'm missing, feel free to chime in. Thanks!!

_________________
Matt.
1983 Pontiac Firebird S/E, 262 V8, TH350 3 speed.
1988 Pontiac Firebird, 2.8 V6 (being replaced with a Cadillac Northstar!), 5 speed.
1992 Subaru SVX, 3.3 H6
1985 Mercedes Benz 300SD I5 Turbo Diesel.


Tue Jul 19, 2011 12:55 pm
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 Post subject: Re: Fixing a 2000 Jaguar S-Type V8 misfire. Knowledge needed
PostPosted: Thu Aug 14, 2014 2:09 pm 

Posts: 48
Location: CNY
Also my good computer got wrecked so I don't have access to the service manuals anymore. So if anyone could get me some fuel delivery or ignition system or even a cylinder chart, that would be very helpful.

_________________
Matt.
1983 Pontiac Firebird S/E, 262 V8, TH350 3 speed.
1988 Pontiac Firebird, 2.8 V6 (being replaced with a Cadillac Northstar!), 5 speed.
1992 Subaru SVX, 3.3 H6
1985 Mercedes Benz 300SD I5 Turbo Diesel.


Tue Jul 19, 2011 12:55 pm
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 Post subject: Re: Fixing a 2000 Jaguar S-Type V8 misfire. Knowledge needed
PostPosted: Thu Aug 14, 2014 7:30 pm 
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Rank: Moderator
Posts: 5703
Location: Boerne, TX
Ok if the check engine light is flashing, it's misfiring. Ford and jaguar use the same coils, and ford coils fail regularly. If you don't have a scan tool, unplug the suspected coil and see if it makes any difference. If you have a scan tool, swap the coil from the missing cyl, and see if the misfire changes cyls. 99% of the time it will. Also pull the plug and check it on the affected cyl. That never hurts.

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-Ryan
1989 R32.4 Nissan Skyline GTS-T 4dr Ls/turbo/6spd
1999 Ford F350 7.3l diesel
1971 Dodge Demon
02 Montero full size
1995 s14.5 rhd 240sx 1jz gt35 w58
1 rhd s13 4 regular s13
02 330ci
64 barracuda


Sun Nov 01, 2009 8:39 pm
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 Post subject: Re: Fixing a 2000 Jaguar S-Type V8 misfire. Knowledge needed
PostPosted: Fri Aug 15, 2014 3:08 am 

Posts: 48
Location: CNY
Alright sounds good. At least it isn't hard to get at the coils since they're only under a head cover. I'm hoping that's the problem. Otherwise there's more poking and prodding to be done around the engine. I'll let you know what happens when I get to it. And yes we have a scanner. I think I know which cylinder it is, but it doesn't appear to be labeled. Then again I haven't looked under the cover yet. I think bank one is on the passengers side and cyl 1-4 go from front to back. And then 5-8 on the driver's side.

_________________
Matt.
1983 Pontiac Firebird S/E, 262 V8, TH350 3 speed.
1988 Pontiac Firebird, 2.8 V6 (being replaced with a Cadillac Northstar!), 5 speed.
1992 Subaru SVX, 3.3 H6
1985 Mercedes Benz 300SD I5 Turbo Diesel.


Tue Jul 19, 2011 12:55 pm
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 Post subject: Re: Fixing a 2000 Jaguar S-Type V8 misfire. Knowledge needed
PostPosted: Fri Aug 15, 2014 8:29 am 
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Rank: Moderator
Posts: 5703
Location: Boerne, TX
Yes sir, the passenger bank should be bank 1 and are labeled cyls 1-4.

_________________
-Ryan
1989 R32.4 Nissan Skyline GTS-T 4dr Ls/turbo/6spd
1999 Ford F350 7.3l diesel
1971 Dodge Demon
02 Montero full size
1995 s14.5 rhd 240sx 1jz gt35 w58
1 rhd s13 4 regular s13
02 330ci
64 barracuda


Sun Nov 01, 2009 8:39 pm
 Profile  
 
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