This seems to have started around the time I got my injectors cleaned... I can't quite remember. It might have been before I got them cleaned. Anyway, what happens is once my temp gets around 105 on the gauge the car seems to stuter when I hit the gas from a dead stop. My boss says that something is probably clogged a bit, so the gas is just boiling/evaporating until I get enough gas flowing to cool it down... who knows? Anyone had this before, and got it fixed? Any idea's on what to check out, any info would be great.

Thanks in advance,
Jay

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'91 RS 305 5.0L V8
All stock for now...

 

forgot to add, it's a 5 spd.

 

Jay,

After the coolant temperature reaches 104°C, the ECM will begin offsetting the fuel and spark curves. At 104°, the acceleration enrichment multiplier (the amount of extra fuel for hard acceleration) is reduced to 50% of what this fuel delivery is on acceleration at or below 80°C. Further, the acceleration enrichment decay factor (the rate at which the extra acceleration fuel is reduced) is increased by a factor of two at 104°C. This means lower performance above 104°, like you experienced. Also, the hot spark retard program begins retarding the spark advance at 116°C.

These parameters are programmed in the ECM PROM to prevent overheating and excessive emissions. This is one of the major reasons many of us modify the cooling system to maintain a lower temperature. Extended engine life and reliability are another major factor.

If this annoys you as much as it does the rest of us, I would suggest flushing the cooling system, installing a thermostat rated at 82°C/180°F, and installing an auxilliary cooling fan switch or control. You can do the whole thing for about $45.00(Can), or you could spend up to $80.00 if you buy an aftermarket fan control and expensive coolant. It's a good excuse to perform some routine maintenance that may be due anyway.

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Later,
Vader
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"No matter how hard you try you can't stop us now..."
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