Obd1 cherokee misfire
#1
Newbie
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Obd1 cherokee misfire
This issue arose recently . I'm having a noticeable random misfire . I've noticed my 94xj taking a bit longer to start initially after sitting overnight . Don't always hear the fuel pump prime as I key on like I used to. On a 20 minute drive I average a handful of misfires throughout the trip . Doesn't matter if off idle or doing 75mph. It feels like you kill the ign for a split second , it will just give you a quick buck but it's extremely quick but noticeable . So far I've changed the plugs, swapped the fuel pump, swapped the fuel pump relay , opened up all the sensor plugs to check for moisture or corrosion. It throws no codes. Next is a new cap /rotor . It idles beautiful and makes good smooth power besides this random issue. Any ideas? Thank you!
#2
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Join Date: Nov 2010
Location: In the middle of Minnesota!
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Year: 1999
Model: Cherokee
Engine: 4.0
Finish the tuneup and then see where you are at.
Still need new plug wires, cap, rotor, fuel filter. All money well spent.
The importance of fresh tuneup hardware cannot be overstated.
Still need new plug wires, cap, rotor, fuel filter. All money well spent.
The importance of fresh tuneup hardware cannot be overstated.
#3
Newbie
Thread Starter
So I swapped out my crank sensor and took it for a ride and it seemed good, no issues. Hope it stays like that.
On the other hand the fuel pump is not priming sometimes on initial start after sitting. If I turn the key I won't hear the pump run and if I keep cranking it won't fire. I then cycle the key and hear the pump prime and it fires right up. What powers the pump when you key on? I'm trying to track down why its intermittent . It never use to do this
On the other hand the fuel pump is not priming sometimes on initial start after sitting. If I turn the key I won't hear the pump run and if I keep cranking it won't fire. I then cycle the key and hear the pump prime and it fires right up. What powers the pump when you key on? I'm trying to track down why its intermittent . It never use to do this
#4
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Join Date: Jan 2015
Location: Oregon Coast
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Year: 1999
Model: Cherokee
Engine: 4.0L I6
Obd1 cherokee misfire
So I swapped out my crank sensor and took it for a ride and it seemed good, no issues. Hope it stays like that.
On the other hand the fuel pump is not priming sometimes on initial start after sitting. If I turn the key I won't hear the pump run and if I keep cranking it won't fire. I then cycle the key and hear the pump prime and it fires right up. What powers the pump when you key on? I'm trying to track down why its intermittent . It never use to do this
On the other hand the fuel pump is not priming sometimes on initial start after sitting. If I turn the key I won't hear the pump run and if I keep cranking it won't fire. I then cycle the key and hear the pump prime and it fires right up. What powers the pump when you key on? I'm trying to track down why its intermittent . It never use to do this
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