89 Cherokee Won't Start - No Fuel Pulse

Hey,
actually Help!


Here's my symptoms:


1. Cranks fine
2. Lots of good spark
3. Timing was set TDC on compression stroke.. verified twice.
4. Fuel Rail is pressurized
5. Crank Pos Sensor functional (as far as we can tell)
6. Map Sensor Functional (voltage too the sensor)
7. Throttle Position Sensor is functional


Big clue is the following and explains why its not firing:


We stuck a Noid light on two or three injector plugs and
there's no pulsing to the injectors. This explains the lack
of starting. But WHY??? What could cause the fuel injectors not
to be pulsed.


We haven't done a compression test but we've got a professionally
built long block so I'm not sure it needs to be done...


Any thoughts or insight would be appreciated..
HELP HELP HELP


Thanks


James

On 10 May 2005 07:09:51 -0700, wrote:

>Hey,
>actually Help!
>
>
>Here's my symptoms:
>
>
>1. Cranks fine
>2. Lots of good spark
>3. Timing was set TDC on compression stroke.. verified twice.
>4. Fuel Rail is pressurized
>5. Crank Pos Sensor functional (as far as we can tell)
>6. Map Sensor Functional (voltage too the sensor)
>7. Throttle Position Sensor is functional
>
>
>Big clue is the following and explains why its not firing:
>
>
>We stuck a Noid light on two or three injector plugs and
>there's no pulsing to the injectors. This explains the lack
>of starting. But WHY??? What could cause the fuel injectors not
>to be pulsed.
>
>
>We haven't done a compression test but we've got a professionally
>built long block so I'm not sure it needs to be done...
>
>
>Any thoughts or insight would be appreciated..
>HELP HELP HELP=20
>
>
>Thanks=20
>
>
>James

IF the CKP and TPS are working, the only reason for no pulse would be a
bad harness to the injectors or a bad ECM.

Did you ever try the booster cable from the battery negative to the
firewall like was suggested on another group? If the body ground is
ratty which is really common, the starter can take up all the power and
the ECU won't turn on.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

wrote:
>
> Hey,
> actually Help!
>
> Here's my symptoms:
>
> 1. Cranks fine
> 2. Lots of good spark
> 3. Timing was set TDC on compression stroke.. verified twice.
> 4. Fuel Rail is pressurized
> 5. Crank Pos Sensor functional (as far as we can tell)
> 6. Map Sensor Functional (voltage too the sensor)
> 7. Throttle Position Sensor is functional
>
> Big clue is the following and explains why its not firing:
>
> We stuck a Noid light on two or three injector plugs and
> there's no pulsing to the injectors. This explains the lack
> of starting. But WHY??? What could cause the fuel injectors not
> to be pulsed.
>
> We haven't done a compression test but we've got a professionally
> built long block so I'm not sure it needs to be done...
>
> Any thoughts or insight would be appreciated..
> HELP HELP HELP
>
> Thanks
>
> James