hi there, I have a 94 3.2 xj40 and cant seem to get a spark at the
coil. I have a live feed going to it and have changed the coil and
amplifer but still nothing. any ideas or tips would be greatly
appriecated.thanks nick–
xj40nick
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In reply to a message from xj40nick sent Mon 23 Jun 2008:
Probably the single most common cause of ignition failure is
the CPS failing.
Without the CPS, the ignition amplifier never gets a signal
to trigger the coil.
Often with a failed CPS the tachometer will not move when
you try and start the engine. I’ve seen the tach move
during a no-start caused by a bad CPS, so it’s not a rock
solid clue for all no-starts but if the tach does not move,
it’s nearly a sure bet its the CPS.–
The original message included these comments:
hi there, I have a 94 3.2 xj40 and cant seem to get a spark at the
coil. I have a live feed going to it and have changed the coil and
amplifer but still nothing. any ideas or tips would be greatly
appriecated.thanks nick
–
91 XJ6, 93 Sov, 97 Sov – Driveway’s crowded!
Tampa Fl, United States
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In reply to a message from Win sent Mon 23 Jun 2008:
hi thanks for the info its much appriciated. by CPS do u mean the
the unit under the dash on the passenger side? thanks again. nick–
xj40nick
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In reply to a message from xj40nick sent Mon 23 Jun 2008:
Nick,
Nope, the CPS is the Crankshaft Position Sensor, front of
the engine, above the main pulley. My apologies, I should
have defined the acronym.
Very easy to replace, has a single bolt (usually a 5mm allen
head, sometimes a 10mm hex head) down at it’s bracket, a
single three wire connector up at the front of the valve
cover and usually a nylon wire tie to secure the wires and
keep them out of the belts.–
The original message included these comments:
In reply to a message from Win sent Mon 23 Jun 2008:
hi thanks for the info its much appriciated. by CPS do u mean the
the unit under the dash on the passenger side? thanks again. nick
–
91 XJ6, 93 Sov, 97 Sov – Driveway’s crowded!
Tampa Fl, United States
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In reply to a message from xj40nick sent Mon 23 Jun 2008:
hi there I changed the c.p.s and still no spark at the coil! does
anyone know what the next thing to check/change would be? any help
would be brillient as im close to pullingmy hair out!–
xj40nick
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hi there this is the latest update on my on going saga! I have no
spark at the coil but have a live feed. I’ve changed the coil,
amplifier, e.c.u and c.p.s. I have movement on the tacho when I
crank it over. I’ve pressed the vcm button to see if it came up with
any fault codes but instead of a number it came up with what looked
like P.A.O. any help would be greatly appriciated as I dont have a
clue what else to try. thanks, nick–
xj40nick
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In reply to a message from xj40nick sent Wed 16 Jul 2008:
Hi Nick,
P.A.O – is actually ‘pad’ as in brake-pad - not related to
the engine at all… but might indicate a worn-out brake pad
or a broken circuit - nothing to do with the real problem
you have…
You say you have a live supply to the coil, can you measure
the resistance of the primary? It should be only 2 or 3
ohms. I wonder if it’s gone open-circuit.–
The original message included these comments:
hi there this is the latest update on my on going saga! I have no
spark at the coil but have a live feed. I’ve changed the coil,
amplifier, e.c.u and c.p.s. I have movement on the tacho when I
crank it over. I’ve pressed the vcm button to see if it came up with
any fault codes but instead of a number it came up with what looked
like P.A.O. any help would be greatly appriciated as I dont have a
clue what else to try. thanks, nickxj40nick
–
Mike. (a)'90 4.0 / (b)'93 4.0 LPG
London, SW17, United Kingdom
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In reply to a message from xj40nick sent Wed 16 Jul 2008:
The VCM fault code you see is ‘PAD’ which is a brake pad
wear sensor warning - nothing to do with your ignition problem.
You say you have power to the coil (battery voltage on the +
terminal on the White/pink wire?). Do you also have battery
voltage to pin 2 of the black 7-way connector on the
ignition amplifier on a White/pink wire when the ignition is on?
Do you hear the half-second priming burst from the fuel pump
each time you turn on the ignition? If not, have you checked
the EMS main relay - the one in the black base in that group
of relays on the firewall in the engine bay? If there is a
problem with that relay you will not get power to the EMS
ECU - and hence no sparks.–
The original message included these comments:
hi there this is the latest update on my on going saga! I have no
spark at the coil but have a live feed. I’ve changed the coil,
amplifier, e.c.u and c.p.s. I have movement on the tacho when I
crank it over. I’ve pressed the vcm button to see if it came up with
any fault codes but instead of a number it came up with what looked
like P.A.O. any help would be greatly appriciated as I dont have a
clue what else to try. thanks, nick
–
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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In reply to a message from MikeSW17 sent Wed 16 Jul 2008:
hi there mike im not good with electrics so your have to bear with
me! I’ve just gone and checked the resistance on the coil and it
showed up as 1 ohm–
The original message included these comments:
the resistance of the primary? It should be only 2 or 3
–
xj40nick
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In reply to a message from Bryan N sent Wed 16 Jul 2008:
hi bryan thanks for the reply. yeh I’ve checked and have a live to
the black connector. what sound should I be listening for with the
priming burst and where from?. thanks again, nick–
The original message included these comments:
Do you hear the half-second priming burst from the fuel pump
–
xj40nick
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In reply to a message from xj40nick sent Wed 16 Jul 2008:
Remove the filler cap from the fuel tank and put your ear to
the filler neck. Then get someone to turn the ignition on
and off a few times - you should hear a short ‘brrrr’ from
the in-tank fuel pump each time the ignition is turned on.–
The original message included these comments:
hi bryan thanks for the reply. yeh I’ve checked and have a live to
the black connector. what sound should I be listening for with the
priming burst and where from?. thanks again, nick
–
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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In reply to a message from Bryan N sent Thu 17 Jul 2008:
sorry I was being stupid I realised what u were talking about after
i sent the post. yes I can hear the fuel pump when I turn on the
ignition. does this mean it wont be the e.m.s–
The original message included these comments:
Remove the filler cap from the fuel tank and put your ear to
and off a few times - you should hear a short ‘brrrr’ from
the in-tank fuel pump each time the ignition is turned on.
–
xj40nick
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In reply to a message from xj40nick sent Thu 17 Jul 2008:
Yes, that should clear the EMS relay.–
The original message included these comments:
sorry I was being stupid I realised what u were talking about after
I sent the post. yes I can hear the fuel pump when I turn on the
ignition. does this mean it wont be the e.m.s
–
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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In reply to a message from xj40nick sent Wed 16 Jul 2008:
Hi
1 ohm is about right for the primary coil.
What do you have on the secondary (between the HT output
terminal and the -ve terminal)? You should see something in
the range 5k ohm to 8k ohm.
What year is your car? In pre-93 cars the tachometer signal
comes from the -ve terminal of the coil. On later models, I
think, the tacho is fed from the ECU.
If yours is pre’93 then the movement you see on the tacho
confirms a pulsed signal at the coil primary.–
The original message included these comments:
In reply to a message from MikeSW17 sent Wed 16 Jul 2008:
hi there mike im not good with electrics so your have to bear with
me! I’ve just gone and checked the resistance on the coil and it
showed up as 1 ohm
–
Mike. (a)'90 4.0 / (b)'93 4.0 LPG
London, SW17, United Kingdom
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In reply to a message from MikeSW17 sent Thu 17 Jul 2008:
i’ll check the secondary when I get home from work today, my car is
a 1994 3.2 so the tacho if fed by the ecu. do you think running a
diagnostic on it might shed some light on whats at fault?–
The original message included these comments:
1 ohm is about right for the primary coil.
What do you have on the secondary (between the HT output
terminal and the -ve terminal)? You should see something in
the range 5k ohm to 8k ohm.
What year is your car? In pre-93 cars the tachometer signal
–
xj40nick
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In reply to a message from xj40nick sent Thu 17 Jul 2008:
Without the right test equipment, it’s difficult to test if
you’re getting a pulsed (on/off) signal at the coil primary
connection. Might need an 'scope.
Alternatively I’ve read about testing the coil by
disconnecting the +ve and -ve wires, connecting the coil -ve
direct to a ground (-ve) on the vehicle and taking a wire
direct from the +ve of the battery and ‘flicking’ it against
the +ve terminal on the coil.
This should generate a spark if the coil is Ok. I’ve not
tried this and can’t confirm it, but it makes sense. But
take care - you can still get a nasty back-emf jolt from the
low volt side of the coil!–
The original message included these comments:
i’ll check the secondary when I get home from work today, my car is
a 1994 3.2 so the tacho if fed by the ecu. do you think running a
diagnostic on it might shed some light on whats at fault?
–
Mike. (a)'90 4.0 / (b)'93 4.0 LPG
London, SW17, United Kingdom
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In reply to a message from MikeSW17 sent Thu 17 Jul 2008:
hi I was checking the coil again and I noticed im getting a slight
earth from the live terminal when I tried a continuity test is this
normal? thanks. nick–
The original message included these comments:
you’re getting a pulsed (on/off) signal at the coil primary
disconnecting the +ve and -ve wires, connecting the coil -ve
direct to a ground (-ve) on the vehicle and taking a wire
direct from the +ve of the battery and ‘flicking’ it against
the +ve terminal on the coil.
–
xj40nick
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any resolution of this non start prob??