V12 bad throttle response
#21
Resistor pack connector actually had one pin, that clearly was corrected. All eight pins are now cleaned as well as the pack itself. Connector assembled with eight small drops of Vaseline oil.
Engine was not really cold, but it started well. Idle is improved and unfortunately also higher. AAV seems not to close properly, as I was unable to reduce idle speed.
Anyway, engine now runs better than ever in my ownership. Happy days.
Engine was not really cold, but it started well. Idle is improved and unfortunately also higher. AAV seems not to close properly, as I was unable to reduce idle speed.
Anyway, engine now runs better than ever in my ownership. Happy days.
Last edited by leo_denmark; 06-10-2017 at 12:46 PM. Reason: Additional pics
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Doug (06-10-2017)
#22
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Seems like corroded/dirty resistor pack pins are coming up in conversation more and more often. Cleaning them should probably be added to the list of "XJS usual faults and fixes" along with the old standards: crumbly throttle bushings, seized distributor advance mechanisms, dreaded shielded wire, etc.
Cheers
DD
Cheers
DD
The following 2 users liked this post by Doug:
Grant Francis (06-10-2017),
Greg in France (06-11-2017)
#23
Seems like corroded/dirty resistor pack pins are coming up in conversation more and more often. Cleaning them should probably be added to the list of "XJS usual faults and fixes" along with the old standards: crumbly throttle bushings, seized distributor advance mechanisms, dreaded shielded wire, etc.
Cheers
DD
Cheers
DD
#24
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,912
Received 10,973 Likes
on
7,209 Posts
#26
#27
Greg
#28
Seems like corroded/dirty resistor pack pins are coming up in conversation more and more often. Cleaning them should probably be added to the list of "XJS usual faults and fixes" along with the old standards: crumbly throttle bushings, seized distributor advance mechanisms, dreaded shielded wire, etc
Greg
Last edited by Greg in France; 06-11-2017 at 12:11 AM.
#29
#30
#31
The following 2 users liked this post by leo_denmark:
Grant Francis (06-11-2017),
Greg in France (11-05-2017)
#33
Brass bushing mounted at B-bank butterfly axle and pushrod adjusted.
Car drives well, but idle is too high, around 1050 RPM warm in N and of course hunting while cold.
I guess first step in AAV fault finding is to block the hole feeding the AAV to see if idle still is high ?
The 3 Torx screws holding the end cover on the inlet manifold had a funny drive size in my opinion. T30 did undo and tighten them, but felt like a too loose fit. T40 is a lot larger. I didn't try it, but I don't think a T40 bolt can be turned by a T30 tool. Did Jaguar invent their own sizes ?
Car drives well, but idle is too high, around 1050 RPM warm in N and of course hunting while cold.
I guess first step in AAV fault finding is to block the hole feeding the AAV to see if idle still is high ?
The 3 Torx screws holding the end cover on the inlet manifold had a funny drive size in my opinion. T30 did undo and tighten them, but felt like a too loose fit. T40 is a lot larger. I didn't try it, but I don't think a T40 bolt can be turned by a T30 tool. Did Jaguar invent their own sizes ?
#34
The 3 Torx screws holding the end cover on the inlet manifold had a funny drive size in my opinion. T30 did undo and tighten them, but felt like a too loose fit. T40 is a lot larger. I didn't try it, but I don't think a T40 bolt can be turned by a T30 tool. Did Jaguar invent their own sizes ?
Greg
#35
#36
#37
Ignition amplifier can do all sorts of gremlin behavior if overheated over time.
Don't forget to always coat the top of the ignition amplifier (get a new gm quality one) with a layer of dialectic grease.
Yes remove condenser.
Check the wires for cracks and check the connectors for corrosion, damage etc.
If you are handy rebuild the thing while you are in there.
There are members who have completely rebuilt their entire amplifier and now have the performance and piece of mind a Jag owner deserves.
Search forums for details
Don't forget to always coat the top of the ignition amplifier (get a new gm quality one) with a layer of dialectic grease.
Yes remove condenser.
Check the wires for cracks and check the connectors for corrosion, damage etc.
If you are handy rebuild the thing while you are in there.
There are members who have completely rebuilt their entire amplifier and now have the performance and piece of mind a Jag owner deserves.
Search forums for details
The following 2 users liked this post by G. Summers:
Greg in France (11-05-2017),
leo_denmark (11-05-2017)
#38
#39
I would be curious to know your engine vacuum reading at idle. I am fighting a similar problem. Although I have a 92 with Marelli ignition. I have been hunting for vacuum leaks and just can't find any. Im planning to check the timing in case the crank pulls slipped. She's laid up for winter now but I will resume the hunt in a few months.
#40