ken johnson
NAXJA Forum User
- Location
- Kentucky
89xj 4.0 auto. Cranks, has fuel at rail. What is an EASY way to test for spark? Also EASY way to test CPS. It's cold and wet this morning. Gotta go to work soon!
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NO START. HELP!
- Thread starter ken johnson
- Start date
avengerdude27
NAXJA Forum User
- Location
- windber, pa
typically if there is no spark you will smell fuel, telling you the cps is telling the injectors to fire, you can check spark by getting a screwdriver in the boot of the plugwire and holding it near a grounded point while someone cranks
CumminsJeep
NAXJA Forum User
- Location
- Jersey
or get yourself an inline spark tester. prob like 5 or 10 bucks at auto zone or napa
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Or a "spare" spark plug, put the plug wire on it and ground the body of the plug to the engine.
birchlakeXJ
NAXJA Forum User
- Location
- Melrose, MN
That is usually the way I do it.
You are looking for a strong, BLUE, snapping spark.Yellow/orange/white indicates a weak spark which may not be strong enough to
start the engine.
Here is link to a
thread that details testing of the crankshaft position sensor.http://www.naxja.org/forum/showthread.php?t=1044073
If you have verified good spark, it is possible that you have good fuel pressure at the rail, but fuel is not getting TO the injectors.
