Wont start very well when hot
09-23-12, 09:34 PM
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Wont start very well when hot
Posted about this a few weeks ago. But didn't get a straight answer on what's wrong 
got a 13b turbo fc that starts first turn of the key when hot. But after being driven till it warms up. If I turn it off even to get petrol the car won't start until I remove the fuel injection fuse from the engine bay. It seems to be getting worse every time I try start it up when it's hot. It's very frustrating cause I can't even run into the shop with out trouble re starting it. Anyone have an idea what's wrong and how to fix it. I thought it may be injectors. So I got them cleaned and pressure tested n they were fine and its still doing it
got a 13b turbo fc that starts first turn of the key when hot. But after being driven till it warms up. If I turn it off even to get petrol the car won't start until I remove the fuel injection fuse from the engine bay. It seems to be getting worse every time I try start it up when it's hot. It's very frustrating cause I can't even run into the shop with out trouble re starting it. Anyone have an idea what's wrong and how to fix it. I thought it may be injectors. So I got them cleaned and pressure tested n they were fine and its still doing it
09-23-12, 10:27 PM
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Try the Water temperature sensor at the back of the water pump.Check that out.
Also you should check compression on the engine.If you have a low compression engine it will start up Ok cold,but then it gets hard to start after it warms up.
Also you should check compression on the engine.If you have a low compression engine it will start up Ok cold,but then it gets hard to start after it warms up.
09-23-12, 10:30 PM
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Ok cool. I'll suss the temp sensor. Is that the one ontop of the motor where u fill up the water. Compression is at 70+ on both rotors. Ihad that checked. Is that very low? How long will the motor last with compression like that?
09-24-12, 12:09 AM
#6
Factory spec is 85 psi per chamber @ 250 RPM with the engine warm & throttle open.
Hot start info: https://www.rx7club.com/2nd-generati...oblems-499744/
If you combine low compression with Mazda's extra rich start map, you get really bad hot start flooding.
Hot start info: https://www.rx7club.com/2nd-generati...oblems-499744/
If you combine low compression with Mazda's extra rich start map, you get really bad hot start flooding.
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09-24-12, 09:05 AM
#8
The resistor semi works. Look later in the thread about cutting the 12v start signal to the ecu when hot. I just wired up a basic switch to pin 1c(s5) so I could cut the 12v signal to the ecu so it wont go into the starting map when the engine is hot. I had the same problem and its low compression(serviced injectors and a NEW mazda clt sensor).
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