98 ls1 motor missing and reving by it self issues please help
Thread Starter
On The Tree
Joined: Oct 2006
Posts: 123
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98 ls1 motor missing and reving by it self issues please help I have a 98 ls1 in my s13. It was running great for about 2.5 years. Then randomly on the freeway the engine would just cut out and turn back on. I ignorned that for the most part. Then i started to notice when i would start the car somtimes it would sound like it would start only on a few cyln or start with wrong firing then smooth out after like 1 second and drive perfectly fine. Lately i have been driving and it will randomly hesitate out of no where for a milisec. long enough to feel a jerk in the engine. Then when i come to stop light it will be idling around 800 and out of no where rev up to 1500 to 2000 rpm and drop down a couple times.
I have done many searches and have found people with the idle issues but no fixes but i think this is somthing that has to possibly do with my cam angle sensor and crank angle sensor. I would wrather change the sensor next to the starter before pulling the intake. I have thought about a clogged vette fuel filter or bad fuel pump but It seems as if it a firing issue. I have new plugs and msd wire. I have some extra coilpacks but i doubt thats it.
I have run the scanner on it and only codes i got was that i dont have a ces light hooked up. I have yet to hook it up on my friend snap on scanner to do some test. If anyone has any ideas please let me know. Also i have gone through the wiring and its perfect no issues.
thanks in advance.
I have done many searches and have found people with the idle issues but no fixes but i think this is somthing that has to possibly do with my cam angle sensor and crank angle sensor. I would wrather change the sensor next to the starter before pulling the intake. I have thought about a clogged vette fuel filter or bad fuel pump but It seems as if it a firing issue. I have new plugs and msd wire. I have some extra coilpacks but i doubt thats it.
I have run the scanner on it and only codes i got was that i dont have a ces light hooked up. I have yet to hook it up on my friend snap on scanner to do some test. If anyone has any ideas please let me know. Also i have gone through the wiring and its perfect no issues.
thanks in advance.
Thread Starter
On The Tree
Joined: Oct 2006
Posts: 123
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found out the idle issue with it reving up by it self. When putting driver header in i broke the water temp sensor. on a 98 its the 3 prong on 99 to 2002 its a 2 prong sensor. The housing is all that broke the 3 prings were sticking out so i tried to still use it and i been getting a code for it but it i wiggle the plug it starts surging and idle to rev and back down. I havnt been able to test if this is why its cutting out.
Thread Starter
On The Tree
Joined: Oct 2006
Posts: 123
Likes: 0
I just fixed the problem. I change my water temp sensor and it gave me a code, change to a new temp sensor still the code. Still shitty weird random idle. Then i took connector on harness and use a pick and tightend up the female ends inside and used dialectic grease and pluged it in. Cleared codes and drove it 60 miles and no issues with it cutting out or the weird reving at stop lights anymore. No codes but code 650 that means i have no MIL hooked up. 
I hope this may solve somone elses issues.
I hope this may solve somone elses issues. 
