Why is my number 7 injector wire not pulsating?

BECCAENTLER

MEMBER
2000 JEEP GRAND CHEROKEE LAREDO
180 MILES

Have changed injectors plugs and coils it is missin really bad and the gas millage is awful

Tuesday, September 25th, 2012 AT 2:39 AM

8 Replies

KHLOW2008

MECHANIC
41,814 POSTS

If you have tested and confirmed the injector is not pulsing, you either have a break in the wiring corcuit ot a faulty PCM.

What trouble codes are you getting?

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Tuesday, September 25th, 2012 AT 5:30 AM

BECCAENTLER

MEMBER
4 POSTS

I had someone to put the injector test light on it all cylinders pulsated but number 7. When tested number seven light just stayed on didn't pulsate.

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Tuesday, September 25th, 2012 AT 8:18 PM

KHLOW2008

MECHANIC
41,814 POSTS

If the light stays on, it means the PCM is bad and keeping the circuit grounded. This should trigger trouble codes. Do you have any trouble codes?

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Tuesday, September 25th, 2012 AT 8:22 PM

KHLOW2008

MECHANIC
41,814 POSTS

It could also mean the wire from injector to PCM is shorted to ground.

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Tuesday, September 25th, 2012 AT 8:22 PM

BECCAENTLER

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4 POSTS

What is PCM and what can I do about this problem hopefully an easy fix

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Tuesday, September 25th, 2012 AT 8:41 PM

KHLOW2008

MECHANIC
41,814 POSTS

Power Control Module, meaing the engine computer. If it is a shorted wire or PCM, it would be an easy fix but the cost between the 2 would be vastly different. You need to check/test the wire for shorting.

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Tuesday, September 25th, 2012 AT 9:09 PM

BECCAENTLER