No spark

A

AndyS

NAXJA Forum User

Location

Shrewsbury, MA

• Aug 4, 2004

• #1

'94 XJ 4.0 stick. Went to the corner store, came back outside, and Jeep just cranks and cranks, no spark to the plugs. There appears to be power to the coil, but no output. Does this sound like a CPS failure? Is it possible to test the CPS at the connector on top of the intake? Thanks -

 

S

skipc

NAXJA Forum User

Location

Georgia & points west and south

• Aug 4, 2004

• #2

Could also be a ground connection. Try taking a jumper cable from battery neg to the coil frame or such. See if it starts that way. If so (seen it happen) it's grounding.

Also try disconnecting the CPS connector and reconnecting it. Seems to be the other reason for no starts...

 

A

AndyS

NAXJA Forum User

Location

Shrewsbury, MA

• Aug 4, 2004

• #3

Those both sound like easy and possible solutions - this motor hold oil like a cheesecloth.

Any other suggestions as how to test the cps from the connector itself?

 

J

jneary

NAXJA Forum User

Location

springfield, virginia

• Aug 4, 2004

• #4

probably the cps. but on hot restart problems, dont rule out the coil

 

A

AndyS

NAXJA Forum User

Location

Shrewsbury, MA

• Aug 5, 2004

• #5

Well, the motor isn't hot anymore - it crapped out last night and it's been sitting all night...

If I crank the motor and use an ohmmeter on the end of the connector for the CPS, should I see a pulse signal for every revolution?

 

B

buffalomatt350

NAXJA Forum User

Location

Manchester, MI

• Aug 5, 2004

• #6

I don't know if it will help you, but I just had a similar problem on a '98 and there are some good tips on the thread that I started, called "Jeep No Start"
Mine turned out being the crank position sensor.

 

A

AndyS

NAXJA Forum User

Location

Shrewsbury, MA

• Aug 5, 2004

• #7

Cool - thanks for the tip!