1997 Jaguar Vanden Plas no start

SONNYSCARS

MEMBER
1997 JAGUAR VANDEN PLAS
6 CYL
2WD
AUTOMATIC
70,000 MILES

Today I replaced the spark plugs the old ones were champion. Possibly the ones which came in the car but they did not look burned. I hooked up a spark plug adaptor and cranked engine over it had spark but red and weak po0ssibly because of the adaptor. When I loosen the fuel line it sorays fuel I think it may not be firing at the proper crank position anw advice you can give will be appreciated

Wednesday, January 13th, 2010 AT 6:45 PM

1 Reply

DAVE H

MECHANIC
13,384 POSTS

IGNITION SYSTEM
Ignition timing and spark distribution are controlled by ECM according to sensor inputs. Ignition timing is controlled primarily as a function of engine load and speed. Engine load is sensed by Mass Airflow (MAF) sensor. Engine speed is sensed by a Crankshaft Position (CKP) sensor. The ECM processes inputs from the sensors and accesses ignition timing from the ignition timing strategy. Individual ignition coils are located above each spark plug. ECM incorporates the primary circuit for each coil and provides switching for each primary circuit. The correct firing sequence and timing of the ignition coils is determined by ECM from cylinder synchronization input provided by the Camshaft Position (CMP) sensor.

Check/clean or replace CMP and CKP

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Sunday, January 17th, 2010 AT 6:06 AM