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Old 08-11-2003, 11:08 AM
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one suggestion i can make is to do a plug chop, run it at high RPM, then quickly let off the accelerator and shut it down, then pull a few plugs and see what they look like, if they are white it`s too lean, which leads me to believe it could be with a open exhaust, even so you richened the mixture to compensate for this, it could still be too lean if your Q-jet came off a "smog mobile" which were already too lean from the factory, also check the fuel pressure, if the fuel pump can`t keep up with the demand, it could be running right on the edge of the bowl being dry also causing a lean condition as Q-jets have a small bowl, but have massive secondary`s and when you stomp it, it`s dumping some fuel in there and it don`t take long to empty the bowl. it`s also possible the trick you did to the thermostat isn`t slowing the water flow down enough, I`d just stick a 160 degree job in it with a small hole drilled in the outer edge so it`ll help to burp some of the air out of the system. stock fan meaning clutch fan? if so check it also to make sure it`s still good and that the thermal unit on the front of it isn`t missing in action. you do have the air dam still under the car? if not this can cause it to overheat also.
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