Quote:
Originally Posted by jpnovak
Usually a suddenly rich is due to a failing sensor. This would be for all EFI types. Here are the most common.
Check the MAP sensor lines to make sure the are not cracked or pinched. This will tell the engine it is running WOT all the time.
Check the Temperature sensors (you might have two). Failed open (high resistance) typically means the engine is cold and enrich the mixture
Check for reference voltage at the TPS. No reference voltage usually means the TPS thinks it is WOT and will enrich to compensate.
Do you have a PC interface? This is the fastest way to look at these values.
BTW, any Motec tuner/operator should be able to plug in and diagnose very quickly.
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+1 on a failed sensor.
I had a "coolant" sensor that failed and that screwed around with me for long time until I found it.
Any tuner should be able to help, most can move between different systems.
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911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
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