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sprinkles08
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 22675
Experience:  Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
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We swapped a 1993 5.2 motor into a 89 Jeep Wrangler. It

Customer Question

We swapped a 1993 5.2 motor into a 89 Jeep Wrangler. It starts runs for second or two and dies. Fuel pump runs and coil is firing. You can pour gas down the throttle body and it would run as long as you pour gas. It had a security system that you had to insert key in back hatch and turn to disable. We don't have security system installed. Can you advise
Submitted: 1 year ago.
Category: Jeep
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to Justanswer!

The engine is dying because the PCM is shutting off the injector drivers. If the Grand Cherokee had factory security (VTSS) then there isn't a way to disarm it in the Wrangler. It doesn't have lock cylinder disarm switches or a VTSS module to send a message to the PCM that it's ok to run.

You'll either need to find a PCM from a Grand Cherokee that didn't have VTSS, replace your PCM with a fresh remanufactured unit, or you can remove yours and send it off to a company that does module repair/remanufacturing and have them take the module back to an out of the box state.