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1995 Jeep Wrangler Question: engine bored .030 over new engine kit pistons, gaskets, etc.

 

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brettster5, 2.5L 4 Cylinder, Dry Ridge, KY, September 25, 2010, 17:33
 Rookie

Engine is a 1995 with 1998 accessories for all I can tell. IT over heated and blew up. engine bored .030 over new engine kit pistons, gaskets, etc. Timing was an issue now it is set correctly. Now sounds like a fuel problem. It basically sat since last Oct. 2009, could it be fuel pump? To many mechanics in on this one.

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  • Answer #1

    Johnny Mopar October 05, 2010, 12:55
     Master

    You got my attention on this one. You say the Timing is set correctly. You cannot set the timing on this vehicle as it is controlled internally within the Powertrain Control Module (PCM). Turning the distributor will not affect timing, however it will cause a variety of driveablility problem from no starts to surging etc. What the distributor does do is to syncronize the Crank Position Sensor with the Cam Position Sensor (in the distributor), so the PCM knows when to fire the injectors. The camshaft position sensor is located in the distributor on all engines. The sensor contains a hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects a rotating pulse ring (shutter) on the distributor shaft. The pulse ring rotates 180 degrees through the sync signal generator. Its signal is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders. A qualified technician should perform this process as it involves connecting a volt meter to the PCM connector, positioning the crankshaft in the proper position and turning the distributor into sync. Probe the wrong wire and you just bought a new PCM.

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