Hot Start Issues - NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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2nd Generation Specific 1986-1992 Discussion

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Old 03-10-2008, 06:33 PM   #1  
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I have hot start issues with my 90 GTUs. I have checked the timing, TPS, BAC ect. Car starts fine cold. runs great on the track, but takes a couple of seconds to fire when the engine is warm/hot, then the idle is low for a moment. The engine has 10k on it.
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Old 03-11-2008, 09:26 AM   #2  
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Quote:
Originally Posted by 1990gtus' post='896292' date='Mar 10 2008, 06:33 PM
I have hot start issues with my 90 GTUs. I have checked the timing, TPS, BAC ect. Car starts fine cold. runs great on the track, but takes a couple of seconds to fire when the engine is warm/hot, then the idle is low for a moment. The engine has 10k on it.
Idle speed motor going bad? Or maybe your plug wires?
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Old 03-11-2008, 02:31 PM   #3  
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I believe the vast majority of hot start issues with these cars can be attributed to dirty fuel injectors that allow fuel to leak into the intake and thus cause an over-rich condition on hot restart.



That being said, how many miles on your injectors?
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Old 03-11-2008, 05:09 PM   #4  
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Injectors were balanced and cleaned by RC engineering, new plug wires less than 15k.
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Old 03-11-2008, 06:16 PM   #5  
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I would try adjusting the tps ever so slightly without using that 2 lights method, go like a 1/4 turn, and remember which direction you went

in so that if its no good you can turn it back.



I always adjust tps by feel
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Old 03-12-2008, 06:04 AM   #6  
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I have always used the lights as a starting point. I will give it a try and i will check the coolent temp sensor. thanks.
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Old 03-15-2008, 02:15 PM   #7  
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Changed out the water temp sensor. It seems to have done the trick. Thanks for the help.
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