Re: 1989 YJ 4.0L Engine Swap question
Fuel pump is powered up on key up, then processor keeps fuel pump
running as long as it sees the PIP signal from the distributor. Check your injectors to see if they are firing with a noid light...if they are, then you have a good PIP signal. If they fade out, then you are losing the PIP (Profile Ignition Pickup) and that can also turn off the fuel pump. Possible processor or relay concern, or wiring. |
Re: 1989 YJ 4.0L Engine Swap question
I know this thread is over 7 months old, but just for anyone else who
might be looking for the answer, here goes.. The PCM (computer) you are using has the SKIM (Sentry Key Imobilizer Module) active. This shuts down the engine after 5 to 10 seconds of running. Best solution is to get a new PCM. Also, check out http://www.cjoffroad.com/forums/ for 4.0L swap info. -Brent Bogrees '89 YJ 4.0L w/ 33" BFG MT's '94 XJ 4.0L w/ 31" BFG AT's http://www.chrr.ohio-state.edu/~bogrees/html/Jeep.html > I have finally gotten my shiny (not really) 4.0L engine in my 89 YJ. It > turns over and trys to start, it runs for about 5 - 10 seconds and dies. > It feels to me like a timing issue, or power is getting cut after that > time period. I'm out of ideas. Does anyone out there who knows their > 4.0 well have any ideas? I'm using the computer and wiring harness from > the donor YJ, and I'm using a CPS conversion kit that mounts the sensor > up front. I suppose the other option could be the computer is flaky, I > hope that is not the case. |
Re: 1989 YJ 4.0L Engine Swap question
I know this thread is over 7 months old, but just for anyone else who
might be looking for the answer, here goes.. The PCM (computer) you are using has the SKIM (Sentry Key Imobilizer Module) active. This shuts down the engine after 5 to 10 seconds of running. Best solution is to get a new PCM. Also, check out http://www.cjoffroad.com/forums/ for 4.0L swap info. -Brent Bogrees '89 YJ 4.0L w/ 33" BFG MT's '94 XJ 4.0L w/ 31" BFG AT's http://www.chrr.ohio-state.edu/~bogrees/html/Jeep.html > I have finally gotten my shiny (not really) 4.0L engine in my 89 YJ. It > turns over and trys to start, it runs for about 5 - 10 seconds and dies. > It feels to me like a timing issue, or power is getting cut after that > time period. I'm out of ideas. Does anyone out there who knows their > 4.0 well have any ideas? I'm using the computer and wiring harness from > the donor YJ, and I'm using a CPS conversion kit that mounts the sensor > up front. I suppose the other option could be the computer is flaky, I > hope that is not the case. |
Re: 1989 YJ 4.0L Engine Swap question
I know this thread is over 7 months old, but just for anyone else who
might be looking for the answer, here goes.. The PCM (computer) you are using has the SKIM (Sentry Key Imobilizer Module) active. This shuts down the engine after 5 to 10 seconds of running. Best solution is to get a new PCM. Also, check out http://www.cjoffroad.com/forums/ for 4.0L swap info. -Brent Bogrees '89 YJ 4.0L w/ 33" BFG MT's '94 XJ 4.0L w/ 31" BFG AT's http://www.chrr.ohio-state.edu/~bogrees/html/Jeep.html > I have finally gotten my shiny (not really) 4.0L engine in my 89 YJ. It > turns over and trys to start, it runs for about 5 - 10 seconds and dies. > It feels to me like a timing issue, or power is getting cut after that > time period. I'm out of ideas. Does anyone out there who knows their > 4.0 well have any ideas? I'm using the computer and wiring harness from > the donor YJ, and I'm using a CPS conversion kit that mounts the sensor > up front. I suppose the other option could be the computer is flaky, I > hope that is not the case. |
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