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Nov 9, 2013 | 08:26 PM

#31

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

Quote:

Originally Posted by Bullstang360

and found zero volts on one pin, 5v on the next pin and 9v on the last pin.

No Idea if shooting any voltage in to the CPS output can harm it. Seems plausible.

Quote:

Originally Posted by Radi

Every time I've heard a PCM/ECU start squealing it's had a failing power supply regulator.

Another 10 Pts to Radi for post #2!...

Last edited by DFlintstone; Nov 9, 2013 at 08:32 PM.

Nov 9, 2013 | 10:56 PM

#32

Bullstang360

Thread Starter

Member

Joined: Oct 2012

Posts: 161

Likes: 0

From: Poulsbo, Wa

Year: 1991

Model: Cherokee

Engine: 4.0 HO

Yah good spark.

Nov 9, 2013 | 11:31 PM

#33

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

If it has spark, compression, and fuel, it will fire if it's not flooded.

Even if the cam or dizzy were out to lunch it should cough, sputter, or backfire or something.

It spurts fuel out the schader valve, (into the rag you are holding there), and does not fire with starting fluid?

This is my first Utube, with my first experiment with a homemade noid light to check injector pulse. I guess a common, (if you can find one) 3 volt LED light works, note, led's are polarity sensitive, will only work one way.

http://www.youtube.com/watch?v=nPdkU...ature=youtu.be

It's allot easier to test your injector pulse that way.

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Last edited by DFlintstone; Nov 9, 2013 at 11:36 PM.

Nov 10, 2013 | 09:02 AM

#34

Bullstang360

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Member

Joined: Oct 2012

Posts: 161

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From: Poulsbo, Wa

Year: 1991

Model: Cherokee

Engine: 4.0 HO

Would a bad MAP sensor cause a complete no start?

Nov 10, 2013 | 01:46 PM

#35

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

Although my 90 has allot different than your 91, I think they share there. Mine will ether do nothing, (just crank), or crank and sputter some if I unplug my MAP. It normally won't start.