1989 xjs v12 no spark
#1
1989 xjs v12 no spark
Hi All,
I am new here and I have 1989 Jaguar XJS 5.3 V12 with Marelli Ignition system and it doesn't starts.
So yesterday I changed:
1. Fuel Pump
2. Ignition Lead Set
3. Spark Plugs
4. Distributor Cap with gasket, filter and new Rotor]
5. 2x Coils
6. 2x Ignition Moduls (Amplifiers)
7. Crankshaft Position Sensor
8. Flywheel Sensor
9. Water Temp Sensor
And after all... the car doesn't starts. There is fuel in the rail, but no spark on both sides. Even I take one plug out and touch it to the engine and nothing, no spark.
Please help. I don't know what to do and where is the problem.
I am new here and I have 1989 Jaguar XJS 5.3 V12 with Marelli Ignition system and it doesn't starts.
So yesterday I changed:
1. Fuel Pump
2. Ignition Lead Set
3. Spark Plugs
4. Distributor Cap with gasket, filter and new Rotor]
5. 2x Coils
6. 2x Ignition Moduls (Amplifiers)
7. Crankshaft Position Sensor
8. Flywheel Sensor
9. Water Temp Sensor
And after all... the car doesn't starts. There is fuel in the rail, but no spark on both sides. Even I take one plug out and touch it to the engine and nothing, no spark.
Please help. I don't know what to do and where is the problem.
#2
#4
Firstky, welcome to teh Forums.
When time permits, please do an Intro in the New Members Area.
No 12v at the coil, mmmm
Does the car have an imobiliser, as in factory or aftermarket. Either of these usually cut voltage to the coil when activated. They also reek havoc now they are getting old.
OR
The ignition switch electrical section needs dismantling and cleaning, It is a seperate item to the Key mechanical section. Locate the rear of the switch, and probe the solid Brown wire with the switch in POS #0 (Off to some), it should have battery voltage. If so, then you have power TO the switch, then test the White/Pink with the switch in POS #1 (accessories to some). You are looking for 12v here also. Then POS #2 (Ignition to some) White wire should have 12v. Then POS #3 (Start to some) White/Yellow, and 12v again.
I reckon the White/Yellow is OK, as you say it cranks but not actually start and run, I think??
If there is NO volts in that Solid Brown wire, then there are supply issues, but one item at a time.
When time permits, please do an Intro in the New Members Area.
No 12v at the coil, mmmm
Does the car have an imobiliser, as in factory or aftermarket. Either of these usually cut voltage to the coil when activated. They also reek havoc now they are getting old.
OR
The ignition switch electrical section needs dismantling and cleaning, It is a seperate item to the Key mechanical section. Locate the rear of the switch, and probe the solid Brown wire with the switch in POS #0 (Off to some), it should have battery voltage. If so, then you have power TO the switch, then test the White/Pink with the switch in POS #1 (accessories to some). You are looking for 12v here also. Then POS #2 (Ignition to some) White wire should have 12v. Then POS #3 (Start to some) White/Yellow, and 12v again.
I reckon the White/Yellow is OK, as you say it cranks but not actually start and run, I think??
If there is NO volts in that Solid Brown wire, then there are supply issues, but one item at a time.
#5
The following 2 users liked this post by xjsv12:
Grant Francis (06-28-2019),
Greg in France (06-28-2019)
#6
#7
Hi Dimitar
The Marelli Car has Two Coils:
Coil 'A' the Red One is the Lower Coil
Coil 'B' the Yellow One is the Upper Coil
Maybe you have got these connected the wrong way round?
If so you won't get a Spark and She won't Start (ask me how I know, or rather don't
Also Check the Fuel Pump Cut out (just to cover all bases)
The Marelli Car has Two Coils:
Coil 'A' the Red One is the Lower Coil
Coil 'B' the Yellow One is the Upper Coil
Maybe you have got these connected the wrong way round?
If so you won't get a Spark and She won't Start (ask me how I know, or rather don't
Also Check the Fuel Pump Cut out (just to cover all bases)
Last edited by orangeblossom; 06-28-2019 at 12:31 PM.
The following users liked this post:
Greg in France (06-28-2019)
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#8
Hi Dimitar
The Marelli Car has Two Coils:
Coil 'A' the Red One is the Lower Coil
Coil 'B' the Yellow One is the Upper Coil
Maybe you have got these connected the wrong way round?
If so you won't get a Spark and She won't Start (ask me how I know, or rather don't
Also Check the Fuel Pump Cut out (just to cover all bases)
The Marelli Car has Two Coils:
Coil 'A' the Red One is the Lower Coil
Coil 'B' the Yellow One is the Upper Coil
Maybe you have got these connected the wrong way round?
If so you won't get a Spark and She won't Start (ask me how I know, or rather don't
Also Check the Fuel Pump Cut out (just to cover all bases)
Most important right now is to get power to the coils...
#10
ENGLISH only on the forums, please.
I think you are writing in BULGARIAN that you also recently bought a 1989 XJS 5.3 v12 and have a problem with the Marelli ignition and it does not start ......?
Graham
Last edited by GGG; 07-01-2019 at 03:14 AM.
The following users liked this post:
Grant Francis (07-01-2019)
#11
The following 2 users liked this post by Dimitar Stoimenov:
Grant Francis (07-02-2019),
Greg in France (07-02-2019)
#13
You should have 12V on the White wire at the coil, If you have no 12V at the white wire you need to fix this first. It comes from the ignition. This voltage also goes to pin 13 of the Marelli ECU and pin4 of the ignition modules. If you have NO 12v at ALL of these places then check the ignition switch
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