4.0 Head and MPI Swap to CJ - What is this thing? - JeepForum.com

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post #1 of 4 Old 04-16-2012, 05:45 AM Thread Starter
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1981 CJ8 
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Cj 4.0 Head and MPI Swap to CJ - What is this thing?

I feel stupid asking this, but I've never worked on a fuel injected engine before (only old harleys, CJ's and lawn mowers ).

What is this thing?

I'm swapping a head and MPI set up from a 1994 Jeep Grand Cherokee onto my CJ-8. I grabbed this thing from the donor vehicle, but I'm not sure what it's for and if I need it. It's got a 4 prong electrical plug that is still on the donor wiring harness, a spot for a vacuum hose, and a cable that fits onto the the throttle. I'm guessing it has something to do with raising RPMs for a warm up period or maybe the cruise control.

Has anyone done an MPI swap specifically with a 1994 Grand Cherokee? I read on some other posts that there may be a security system that needs to get bypassed on the computer.

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post #2 of 4 Old 04-16-2012, 06:28 AM
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2005 TJ Wrangler 
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Definitely looks like cruise components to me.

05 Rubicon "Big Stupid" / 99 XJ on 31s "Nurple" FOR SALE. / 07 WK Limited CRD GDE Hot Tuned DPF delete. / 00 TJ "One Shot Wonder"/ 03 Nissan SE-R 6 speed V spec. / 00 Suzuki DR650.
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post #3 of 4 Old 04-16-2012, 07:00 AM
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1997 ZJ 
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That's the cruise control.
Idle is controlled by the computer with the idle air control servo on the throttle body, (cylindrical unit on the side 90° off from the throttle lever).

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #4 of 4 Old 04-16-2012, 07:09 AM Thread Starter
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Then that answers my question. I'll put it on Craig's list in case someone needs a replacement, because my old CJ is not gonna have cruise control.

thanks for the help
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