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Discussion Starter · #1 ·
My 2.6 91 Trooper was running perfect, until one day it died while I was driving it, 5 minutes later it started and ran for like 50 yards and then died again. That was the last ime it ran. It turns over fine but there is no power from the plugs. A garage actually exchanged my parts with another 91 Trooper, they all were fine i.e. distributor, coil ignitor, brain. They think it may be a short somewhere inside. Has anyone had this problem?? Can anyone help me out? Thanks
 

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it will flash code 12, 3 times, and then show any stored codes. If you want to check it there are two leads by the ecu that you connect and turn on the key...wait for it to flash 12 (1 flash, pause, 2 flashes) 3 times, and then see if it does anything else.
 

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Discussion Starter · #5 ·
They put my brain in another 91 Trooper and it worked fine, it's got to be something else, they said the diagnostic check did not determine any out of the ordinary codes. Is there another part I may be overlooking that would not allow spark?
 

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Howdy. Find another shop. This is an easy system to diagnose. Your shop obviously tried a "shot-gun" approach. This approach is entirely unnessary.

Here's what happens. Engine cranks over via starter. Camshaft position sensor (CMP) or Crankshaft position sensor (CKP) sends a signal to the ECM (brain). ECM sees the signal and tells the coil when to fire to the distributor cap. Distributor cap allocates the spark to the appropriate wire and plug via the rotor. Coil must have 12V power and must be firing off the correct winding on the coil. Again, there are only a few things to check here, and the process almost never involves replacing the entire system. Find a tech who can isolate the problem. My 2 cents.

-Kevin
 
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