help with jeep ht signal

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help with jeep ht signal

Postby kmgreg » Thu Dec 16, 2010 7:28 pm

i scoped this jeep cherokee today it had a misfire or stumble when throtle applied.can some one tell me what is going on in the burn time line in the capture.i think the coil is faulty.
Attachments
jeep ign cut.PNG
taken with clamp pick up lead on cylinder1 and3
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Re: help with jeep ht signal

Postby Robski » Fri Dec 17, 2010 3:01 pm

Hi

How can you condemn the coil without taking an amps trace ?

What you are seeing could be plugs/leads.The spark line on the brown trace appears to be sloping upwards which could indicate a lean mixture.

Is this a random misfire or cyl specific ?

Take a primary,current ramp & secondary trace from the affected cyl/s with more time on the screen & at idle & snap throttle & possibly post the PSD file,you are also probably better off posting on a car forum.

HTH

Rob.
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Re: help with jeep ht signal

Postby kmgreg » Fri Dec 17, 2010 6:41 pm

thank for your advice robskie i will try a current trace.the plugs and leads are new when you drive the car it has a single cylinder intermitant miss under load.i was condeming the coil on the road test results and did not understand the traces i got when compared to pico examples.thank you for your replie.
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