Recent content by ptimhere

My son and I recently swapped a 98 4.0 into our 01 xj. We finally got it to start and run. One of our last hurdles is the o2 sensors. The 01 motor used 4, 2 before and 2 after the 2 cats. The 98 exhaust only uses 2, 1 on the down pipe and 1 post cat. Is it possible to run one sensor in each...

Thanks Tim. These are the 5 locations I've got - oil dipstick tube stud - multiple grounds stud near cam sensor - 2 ground wires bolt holding cam synchronizer - 1 ground direct from battery fender near pcm - multiple ground connections rear firewall - ribbon cable (currently connected to valve...

I'm just trying to verify where the engine grounds are on a 2001 after an engine swap. I have two set of ground wires on the passenger side of the block bolted to the block under the head. Are there others I may be missing?

I checked a new coil at autozone today and it tested with the same resistance 1.9 ohms across the board.

2001 xj, 4.0. I'm trying to test the coil rail. I've seen specs ranging from .7-1.1 ohm as acceptable readings from the #2 pin to pins 1,3,4 on the rail connector. Haynes manual says .95-1.1, cherokeeforum says .7-.88. I'm getting 1.9 across the board. I know it sounds obvious, but is that...

It shouldn't be the cam sensor, but we will check it. It was brand new with the synchronizer we bought to replace the distributor.

I would love for it to be that easy at some point. At the moment, we don't seem to be getting any spark at all. If we pull the coil rail and try to ground a plug when we turn it over, there is no spark there that I can see or hear.

Ok, this is a little complicated. We have an 01 xj. Blew the motor about a year and a half ago. Late last year, we picked up a motor from a 98 cheap. We managed to get the engines swapped out before work went crazy and winter set in. Now they we are a little less busy, my son and I are trying...

Thanks. The last two days, my son has been taking the dash back apart and checking all of the connections. We replaced the heater core a week before the failure and I told him he needs to double check all of the connections to make sure they are secure. In the process of putting it back...

The scan tool does not connect to the pcm at all. I'm trying to check sensors to see if there is a bad one on the loop. I'm very interested to know what relay that is. I will have to go exploring some more.

Thanks for helping to keep me on track. Just updates, the scan tool doesn't connect to the pcm, it doesn't even see it. There is no bus on the dash. The jeep cranks, but refuses to start. Having checked the voltage at the CPS and finding it low, I'm working to check through the other sensors...

Ah, I forgot to include that, meant to put it at the top of the post - 2001 Cherokee Limited. The supply voltage at the harness, disconnected from the sensor is the same as when the sensor is connected - 1 volt, DC.

I've been trying to pin down a no start no bus condition. General consensus was CPS, so got a new one and the condition continued. I was able to crawl under the machine today with a meter and these are the readings I got - old sensor - infinite resistance, 1 volt dc, no ACv new sensor - 4.7 on...

As I'm double checking sensors, the sensor I took out measured infinite resistance on a 200K ohm scale (my meter only has 200 and 200K). The new sensor reads 4.7 on the 200K scale. I'm reading mixed things about whether that is acceptable range or not.

Ok, we replaced the CPS today. And we are still getting the same errors, won't start and no bus on the dash. Is there anything else we might double check before assuming its the computer?