ecu swap -

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post #1 of 3 Old 08-18-2011, 10:37 PM Thread Starter
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1994 ZJ 
Join Date: Mar 2009
Location: green cove springs
Posts: 131
ecu swap

can i swap my ecu with alarm for a non alarm ecu and bypass the vtss on a 93 zj 5.2?

Here is what is happening.

Jeep has very hard time starting, and currently will not start.

Vehicle - 93 Jeep Grand Cherokee Laredo 4x4 5.2

replaced coil
replaced auto shutdown relay
replaced battery
redid battery connection and verified all grounds to the engine
grounded out security system inside driver door

Here is what I was able to do until yesterday to get vehicle to start, once running it runs great, but
getting it started is getting worse and worse to accomplish.

1. Turn on Key
2. let sit for approx 30 seconds - security light comes on in dash (even after grounding out system)
3. let sit for approx 1-2 minutes - auto shutdown relay clicks rapidly for 3-5 seconds
4. check engine light comes on
5. able to start engine on first turn of key, catches immediately and runs great

Now - never get the rapid clicking in the auto shutdown relay, engine will not catch, cranks but will not
catch and start.

this is why i am wanting to swap out ecu's.maybe even the vtss. and does anyone know where it is on a 93 zj?...the vtss and vtss relay that is i guess b y the glove compartment.

96'zj 5.2 project
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post #2 of 3 Old 08-18-2011, 11:26 PM
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1995 ZJ 
Join Date: Jan 2010
Location: Mobile, Alabama
Posts: 3,252
From what ive heard you cant get rid of the OE alarm, only disable it. Are you sure you got a good ground in the door? not everything metal is an acceptable ground, i had to poke around checking for continuity with a mulitmeter to find a good spot, then used a wire wheel to get some nice fresh metal.

95 ZJ 5.2- D30/XJ shafts/D35 Yukon alloys,249, 2"BB, 30x9.5"Wildcat EXT,lots of motor mods, rancho shocks & stabilizer.

Originally Posted by slayercr23 View Post
How would i go about Stroking it?
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post #3 of 3 Old 08-19-2011, 12:25 AM Thread Starter
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1994 ZJ 
Join Date: Mar 2009
Location: green cove springs
Posts: 131
ok i will do that in the morning...make sure its got a good ground. thanks

96'zj 5.2 project
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