cranking - no injector pulse
Thread Starter
Drifting
Joined: Dec 1999
Posts: 1,361
Likes: 0
From: medina ohio
Cruise-In I Veteran
cranking - no injector pulse
1991 L98 auto - no start.
did all the stupid tests first. 44psi @ rails, have spark on all 8, car starts on starting fluid then is drivable.
noid light on injector harness = no pulse while cranking but pulses as normal when car is fired on starting fluid.
wiring problem? ecm? a sensor?
harness appears to be in good condition, never had electrical gremlins.
did all the stupid tests first. 44psi @ rails, have spark on all 8, car starts on starting fluid then is drivable.
noid light on injector harness = no pulse while cranking but pulses as normal when car is fired on starting fluid.
wiring problem? ecm? a sensor?
harness appears to be in good condition, never had electrical gremlins.
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
1991 L98 auto - no start.
did all the stupid tests first. 44psi @ rails, have spark on all 8, car starts on starting fluid then is drivable.
noid light on injector harness = no pulse while cranking but pulses as normal when car is fired on starting fluid.
wiring problem? ecm? a sensor?
harness appears to be in good condition, never had electrical gremlins.
did all the stupid tests first. 44psi @ rails, have spark on all 8, car starts on starting fluid then is drivable.
noid light on injector harness = no pulse while cranking but pulses as normal when car is fired on starting fluid.
wiring problem? ecm? a sensor?
harness appears to be in good condition, never had electrical gremlins.
__________________
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Just had a car that was doing this same thing, wouldn't light the nod light while cranking. Replaced the ECM and it fired right up..this could be your problem if its not the injectors like Jon says...WW
Last edited by WW7; Jul 7, 2009 at 06:16 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Been gone a while, Scorp? 
L98's all batch fire and first of the LT1"s ; SD 92 -93
the '94+ with MAF got sequential
To the OP
The ECM also has to see the pulse signal from the distributor to fire the injectors while cranking
L98's all batch fire and first of the LT1"s ; SD 92 -93
the '94+ with MAF got sequential
To the OP
The ECM also has to see the pulse signal from the distributor to fire the injectors while cranking
Last edited by rodj; Jul 7, 2009 at 10:44 PM.
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Thanks for the answer though! For some reason I thought when the L98 went to MAP it also changed to sequential.
Drifting
Joined: Oct 2006
Posts: 1,554
Likes: 13
From: Romeoville IL
Make sure to check the simple too. My tach signal from the distributor had come loose and wasn't making a connection. I hunter for too long, trying other things first when this happened to mine, before I found the simple loose connection at the distributor. Always check the simplest first before you go spending money on the exotic solutions.
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