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General Forums => The Mess Hall => Topic started by: kauaijeep on August 04, 2006, 12:28:10 AM

Title: knock sensor?
Post by: kauaijeep on August 04, 2006, 12:28:10 AM

Is there a knock sensor used in the 1991 2.5l yj? If it does, then where would it be located? Thanks.

Title: Re: knock sensor?
Post by: Jeffy on August 04, 2006, 12:13:24 PM

Quote from: "kauaijeep"

Is there a knock sensor used in the 1991 2.5l yj? If it does, then where would it be located? Thanks.

I don't believe it does.

Title: knock sensor?
Post by: yellowta on August 04, 2006, 01:57:42 PM

I think the knock sesnor is an OBD-II item not put in until 96' I think. Could be wrong though :lol:

Title: knock sensor?
Post by: Jeffy on August 04, 2006, 04:49:51 PM

Quote from: "yellowta"

I think the knock sesnor is an OBD-II item not put in until 96' I think. Could be wrong though :lol:

They used knock sensors on the earlier 4.2L's and early Renix 4.0L's.  I think the 3.7L uses one also.

Title: knock sensor?
Post by: kauaijeep on August 05, 2006, 01:57:14 AM

Thanks for the info. By the way is there any way to adjust the timing on a '91 yj?

Title: knock sensor?
Post by: yellowta on August 05, 2006, 09:23:15 AM

Valve timing or ignition timing? For one, you would have to buy a timing chain and gear set that would allow you to see how much you were retarding or advancing the timing... or you could be brave and just mount the stock gear one or two teeth off of tdc. Dangerous I would imaging. Ignition should just be a matter of loosening the hold down clamp and turning the distributor while monitering the engine with a timing light :roll:   I think  :lol:

Title: knock sensor?
Post by: Jeffy on August 05, 2006, 12:33:06 PM

I'm thinking he's refering to engine timing which is controlled by the PCM.  Although you can adjust it a little with the CPS.  You'll have to modify the sensor.

Title: knock sensor?
Post by: kauaijeep on August 07, 2006, 02:26:18 AM

Sorry for not being more specific, but yes it was ignition timing that I was asking about and I will try to slot out the holes on the cps and move it opposite of the engine rotation as posted on another topic. Thanks.