Fuel Injectors not cycling???
#1
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Model: Cherokee
Fuel Injectors not cycling???
I am trying to get the 1988 XJ running after sitting for three years. I have swapped out the tank, fuel pump, hoses, and filter. I have good fuel pressure when cranking and I have spark. I have also tried a new ECM under the dash with no luck. I will be cleaning the electrical connectors and the firewall circuit later this week and have ordered six upgraded injectors. I am curious if there is a relay or fuse that I am not finding that may be causing the cycling issue. Any help or suggestions are appreciated.
#2
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Year: 1997
Model: Cherokee
Engine: 4.0L
Have you tried pouring a little fuel into the throttle body and see if it runs for a couple seconds. Not sure about your model, but cam sensor and crank sensor should be checked next.
#3
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It starts with fuel added to the plenum. Crank sensor is good or there would be no spark. I dont believe I have a camshaft sensor, looks like thats a 2000 up model year.
Last edited by Prater; 08-14-2013 at 12:21 PM.
#4
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
In Renix the gizmo is also called a distributor pickup or sync generator. They'll actually run with them unplugged. Worth a shot.
You getting fuel pressure at the rail? Spark plugs wet with fuel after cranking?
You getting fuel pressure at the rail? Spark plugs wet with fuel after cranking?
#5
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Fuel pressure at the rail (40PSI with vacuum on the regulator), I will double check the plugs but they were dry last time I checked. I have a Noid light on the way, I put my stethescope on the selenoids of the injectors and there is no noise at all when cranking. I will look at the pickup and see if there are any issues there.
Thanks
Thanks
#7
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I am trying to get the 1988 XJ running after sitting for three years. I have swapped out the tank, fuel pump, hoses, and filter. I have good fuel pressure when cranking and I have spark. I have also tried a new ECM under the dash with no luck. I will be cleaning the electrical connectors and the firewall circuit later this week and have ordered six upgraded injectors. I am curious if there is a relay or fuse that I am not finding that may be causing the cycling issue. Any help or suggestions are appreciated.
We will get through this.
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#9
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I cleaned the c101 and a lot of sensers with electrical Cleaner. That C101 was nasty. Dead batery so looks like I will try to start it in the morning.
#10
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After checking the battery and finding a loose power cable on the battery she fired up. Looks like the C101 and loose power cable was causing the issue. she ran like crap though. looks like a fuel injector is stuck or the regulator went bad. I have a new regulator and just waiting for the new injectors to arrive...
thanks for the help everyone.
thanks for the help everyone.
#11
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Year: 1990
Model: Cherokee (XJ)
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Done all of the procedures? The 4 of them yet?
#13
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Year: 1990
Model: Cherokee (XJ)
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